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| <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> |
| <meta name="Author" content="Veronika Irvine"> |
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| <title>DND in SWT</title> |
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| <body bgcolor="white" lang="EN-US" link="blue" vlink="purple" style="tab-interval:.5in"> |
| |
| <div align="right"><font size="-2">Copyright © 2003 International Business Machines |
| Corp.</font> |
| <table border=0 cellspacing=0 cellpadding=2 width="100%"> |
| <tr> |
| <td align=LEFT valign=TOP colspan="2" bgcolor="#0080C0"><b><font face="Arial,Helvetica" color="#FFFFFF"> Eclipse |
| Corner Article</font></b></td> |
| </tr> |
| </table> |
| </div> |
| <h1> <img src="images/idea.jpg" align=CENTER></h1> |
| <h1 align="center">Drag and Drop</h1> |
| <h3 align="center">Adding Drag and Drop to an SWT Application</h3> |
| <p align="justify"><b>Summary</b><br> |
| Drag and drop provides a quick and easy mechanism for users to re-order and |
| transfer data within an application and between applications. This article is |
| an overview of how to implement Drag and Drop and Clipboard data transfers |
| within an SWT application.</p> |
| <p><b>By Veronika Irvine, IBM OTI Labs</b><br> |
| <span style="font-size:10.0pt">August 25, 2003 (revised November 2, 2005)</span></p> |
| <div align="center" style="text-align:center"> |
| <hr size="2" width="100%" align="center"> |
| </div> |
| <h2>Drag and Drop Overview</h2> |
| <p>Consider the simple example of dragging an item from one table to another |
| as shown in Figure 1:</p> |
| <p align="center"><img border="0" src="images/image002.jpg"><br> |
| Figure 1: Shopping Cart example</p> |
| <p align="justify">On the right there is a list of items that I can purchase |
| and on the left is my shopping cart. To buy something, I select it from the |
| list on the right (I have selected Truffle Assortment in Figure 1), drag |
| it over to my shopping cart and drop it. When I let go of the mouse over my |
| shopping cart, the item will be added to the list of items I wish to purchase. |
| In this data transfer, the list of assorted chocolates on the right is the |
| drag source and my shopping cart is the drop target. A drag source is the |
| source of the data being transferred and a drop target is the receiver. As I |
| drag the mouse over a drop target, I get feedback in various forms. First, the |
| cursor changes to let me know that I am over a valid drop target by changing |
| from a do not enter sign to an arrow (this is called a drag over |
| effect). The cursor also tells me what kind of operation will be performed |
| when the data is transferred the data may be copied or moved or a link may |
| be made to the data. Secondly, if I am dragging over a widget that has |
| sub-items like a tree or table, the sub-item may be highlighted to indicate |
| that the data will be dropped on a specific sub-item (this is called a drag |
| under effect). This is useful when you are organizing data into folders or |
| rearranging items. In this article, I will explain in more detail the terms I |
| have introduced above and how SWT allows an application to define and |
| manipulate these components.</p> |
| <ul> |
| <li><a href="#_Drag_Source">DragSource</a></li> |
| <li><a href="#_Drop_Target">DropTarget</a></li> |
| <li><a href="#_Using_the_Clipboard">Clipboard</a></li> |
| <li><a href="#_Transfer">Transfer</a></li> |
| </ul> |
| <h2><a name="_Drag_Source"></a>Drag Source</h2> |
| <p align="justify">A drag source is the provider of data in a Drag and Drop |
| data transfer as well as the originator of the Drag and Drop operation. The |
| data provided by the drag source may be transferred to another location in the |
| same widget, to a different widget within the same application, or to a |
| different application altogether. For example, you can drag text from your |
| application and drop it on an email application, or you could drag an item in |
| a tree and drop it below a different node in the same tree.</p> |
| <p align="justify">Let us walk through a simple example showing how to define |
| a drag source. The example in Listing 1 shows how to drag text from a label |
| widget.</p> |
| <table border="1" cellspacing="0" cellpadding="0" style="width:650"> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border-top:solid windowtext .5pt; |
| border-left:solid windowtext .5pt;border-bottom:none;border-right:none; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_ds1C" href="#_ds1D">1</a></td> |
| <td valign="top" style="width:788;border-top:.5pt solid windowtext; |
| border-left:medium none;border-bottom:medium none;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>import |
| org.eclipse.swt.dnd.*;</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">2</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code></code> </td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_ds4C" href="#_ds4D">3</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code><font color="#0080C0">// |
| Enable a label as a Drag Source</font></code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds4D">4</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>final |
| Label dragLabel = new Label(shell, SWT.BORDER);</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds4D">5</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>dragLabel.setText("text |
| to be transferred");</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">6</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code></code> </td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_ds8C" href="#_ds8D">7</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code><font color="#0080C0">// |
| Allow data to be copied or moved from the drag source</font></code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds8D">8</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>int |
| operations = DND.DROP_MOVE | DND.DROP_COPY;</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds8D">9</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>DragSource |
| source = new DragSource(dragLabel, operations);</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">10</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code></code> </td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_ds12C" href="#_ds12D">11</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code><font color="#0080C0">// |
| Provide data in Text format</font></code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds12D">12</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>Transfer[] |
| types = new Transfer[] {TextTransfer.getInstance()};</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds12D">13</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>source.setTransfer(types);</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">14</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code></code> </td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_ds15C" href="#_ds15D">15</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>source.addDragListener(new |
| DragSourceListener() {</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_ds16C" href="#_ds16D">16</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| public void dragStart(DragSourceEvent event) {</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds16D">17</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| <font color="#0080C0">// Only start the drag if there is actually text |
| in the</font></code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds16D">18</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| <font color="#0080C0">// label - this text will be what is dropped on the target.</font></code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds16D">19</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> if |
| (dragLabel.getText().length() == 0) {</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds16D">20</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> event.doit |
| = false;</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds16D">21</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> }</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds16D">22</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_ds23C" href="#_ds23D">23</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| public void dragSetData(DragSourceEvent event) {</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds23D">24</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code><font color="#0080C0"> |
| // Provide the data of the requested type.</font></code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds23D">25</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> if |
| (TextTransfer.getInstance().isSupportedType(event.dataType)) {</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds23D">26</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> event.data |
| = dragLabel.getText();</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds23D">27</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> }</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds23D">28</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_ds29C" href="#_ds29D">29</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| public void dragFinished(DragSourceEvent event) {</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds29D">30</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> <font color="#0080C0">// |
| If a move operation has been performed, remove the data</font></code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds29D">31</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> <font color="#0080C0">// |
| from the source</font></code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds29D">32</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> if |
| (event.detail == DND.DROP_MOVE)</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds29D">33</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> dragLabel.setText("");</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_ds29D">34</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">35</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:788;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="43" valign="top" style="width:.45in;border-top:none;border-left:solid windowtext .5pt; |
| border-bottom:solid windowtext .5pt;border-right:none;padding:0in 5.4pt 0in 5.4pt">36</td> |
| <td valign="top" style="width:788;border-top:medium none;border-left:medium none; |
| border-bottom:.5pt solid windowtext;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>});</code></td> |
| </tr> |
| </table> |
| <p align="left">Listing 1: Dragging text from a Label widget. |
| <p align="justify"><a name="_ds1D" href="#_ds1C"><b>Line 1:</b></a><br> |
| All the SWT drag and drop classes are defined in the package |
| org.eclipse.swt.dnd.</p> |
| <p align="justify"><a name="_ds4D" href="#_ds4C"><b>Lines 3 to 5:</b></a><br> |
| Create a widget. In order to start a drag, the user holds the mouse button |
| down in a widget and drags the mouse. In our example, the user starts the drag |
| in the label. Note that you cannot have multiple drag sources on one widget. |
| If you try to create a second drag source, an SWTError will be thrown.</p> |
| <p align="justify"><a name="_ds8D" href="#_ds8C"><b>Lines 7 to 9:</b></a><br> |
| To make a widget into a drag source, we must create an |
| org.eclipse.swt.dnd.DragSource object. The DragSource constructor takes two |
| arguments, the widget that will be the location of the drag source and the |
| operations that are allowed. The allowed operations determine what kind of |
| actions the drop target can do with the data being transferred. The allowed |
| values are any bitwise OR combination of DND.DROP_COPY, DND.DROP_MOVE or |
| DND.DROP_LINK. In the example, we are allowing the data to be copied or moved.</p> |
| <p align="justify"><a name="_ds12D" href="#_ds12C"><b>Lines 11 to 13:</b></a><br> |
| To complete the definition of a drag source, you must specify the types of |
| data that can be transferred. A data type is defined by a subclass |
| org.eclipse.swt.dnd.Transfer such as TextTransfer or FileTransfer. For a |
| detailed description of Transfer types see <a href="#_Transfer">Transfer</a>. |
| A drag source can provide more than one format of the data, however, it is |
| required to provide the data in any of the specified formats when requested. |
| In this example, the user can drag text from the label.</p> |
| <p align="justify"><a name="_ds15D" href="#_ds15C"><b>Line 15:</b></a><br> |
| Once the drag source is defined, a mechanism is required for it to interact |
| with the Drag and Drop operation. Adding a DragSourceListener does this.</p> |
| <p align="justify">The following event sequences may occur:</p> |
| <ol> |
| <li>dragStart</li> |
| <li>dragStart, one or more dragSetData, dragFinished</li> |
| <li>dragStart, dragFinished</li> |
| </ol> |
| <p align="justify"><a name="_ds16D" href="#_ds16C"><b>Lines 16 to 22:</b></a><br> |
| The dragStart event signals that the user has performed the action that |
| initiates a Drag and Drop operation. The exact action taken by the user |
| depends on the platform on Windows for example, the user presses down with |
| the left mouse button and drags for a certain number of pixels (the exact |
| distance is configurable by the user in the Mouse control panel). On Motif, |
| the user presses down the middle mouse button. The application does not need |
| to be concerned about the exact conditions that started the operation because |
| SWT handles these platform differences. When the dragStart event is received, |
| the application has the choice to start a Drag and Drop operation or not. For |
| example, if no valid items are currently selected in the drag source widget, |
| the application may choose to cancel the operation. The operation is cancelled |
| by setting the event.doit field to false.</p> |
| <p align="justify">Note: the application is not required to specify the type |
| of data that will be transferred until the dragStart event has been received. |
| That is, the application can defer the call to DragSource.setTransfer until |
| the dragStart event. However, once the dragStart event has been processed, if |
| no transfer types have been specified for the drag source, the Drag and Drop |
| operation will be cancelled.</p> |
| <p align="justify">By allowing the Drag and Drop operation, the application is |
| making a promise to provide data of the specified type when requested. Failure |
| to do so is a violation of the DND contract and could result in unexpected |
| behavior.</p> |
| <p align="justify"><a name="_ds23D" href="#_ds23C"><b>Lines 23 to 28:</b></a><br> |
| The dragSetData event is a request for the data promised in the dragStart |
| event. This event may be called multiple times either repeatedly for the same |
| data type or for any of the data types promised. On some platforms, a |
| potential drop target can request data when the mouse is moving over the drop |
| target (e.g. Windows) and on some platforms the data may only be requested |
| when a drop is performed (the mouse is released over a valid drop site) (e.g. |
| Motif). Therefore, do not make any assumptions that the drag and drop |
| operation is completed when receiving this event. There is no way to know |
| where the data is being dropped it could be dropped on the same |
| application, even on the same widget or on another application.</p> |
| <p align="justify">The type of data being requested is specified in the |
| event.dataType field. The event.dataType field contains a TransferData object. |
| While the fields of the TransferData object are public, they are platform |
| dependant. Therefore, you should not access the fields directly but rather |
| pass the TransferData to a Transfer object to determine the type of data. This |
| is done in the example by calling TextTransfer.getInstance().isSupportedType |
| (line 25).</p> |
| <p align="justify">The drag source must fill in the event.data field. The |
| exact form of the data depends on the Transfer type. For example, TextTransfer |
| expects a String object containing the entire text whereas a FileTransfer |
| expects a String array where each entry in the array is the absolute path of a |
| File. The javadoc for each transfer type should describe the expected value |
| for the Java object being transferred. More information on Transfer and |
| TransferData is available in the <a href="#_Transfer">Transfer</a> section of |
| this document.</p> |
| <p align="justify"><a name="_ds29D" href="#_ds29C"><b>Lines 29 to 34:</b></a><br> |
| The dragFinished event indicates that the drag and drop operation is complete. |
| The user may have dropped the data on a valid location, dropped the data on an |
| invalid location or hit Escape. If the user dropped the data on an invalid |
| location or hit Escape, the event.doit field will be false and the |
| event.detail field will be DND.DROP_NONE. If the user dropped the data on a |
| valid location, the event.doit field will be true and the event.detail field |
| will indicate the kind of operation performed by the drop target. This will be |
| one of values specified in table 1.</p> |
| <table border="1" cellspacing="0" cellpadding="2" width="90%"> |
| <tr> |
| <th width="30%" valign="top" height="19">dragFinished event.detail value</th> |
| <th width="70%" valign="top" height="19">Description</th> |
| </tr> |
| <tr> |
| <td width="30%" valign="top" height="19">DND.DROP_COPY</td> |
| <td width="70%" valign="top" height="19">The drop target made a copy of |
| the data.</td> |
| </tr> |
| <tr> |
| <td width="30%" valign="top" height="20">DND.DROP_LINK</td> |
| <td width="70%" valign="top" height="20">The drop target made a link to |
| the data usually only used for files.</td> |
| </tr> |
| <tr> |
| <td width="30%" valign="top" height="38">DND.DROP_MOVE</td> |
| <td width="70%" valign="top" height="38">The drop target made a copy of |
| the data and the drag source should now delete the original and update |
| its display.</td> |
| </tr> |
| <tr> |
| <td width="30%" valign="top" height="57">DND.DROP_TARGET_MOVE</td> |
| <td width="70%" valign="top" height="57">The drop target moved the data |
| from its original location to a new location. This is usually only used |
| with files. In this case, the drag source does not need to delete the |
| original; it just needs to update its display information.</td> |
| </tr> |
| </table> |
| <p align="left">Table 1: Valid dragFinished event.detail values |
| <h2><a name="_Drop_Target"></a>Drop Target</h2> |
| <p align="justify">A drop target receives data in a Drag and Drop operation. |
| The data received by the drop target may have come from the same widget, from |
| a different widget within the same application, or from a different |
| application altogether. For example, you can drag text from an email |
| application and drop it on your application, or you could drag an item in a |
| tree and drop it below a different node in the same tree.</p> |
| <p align="justify">Let us walk through a simple example showing how to define |
| a drop target. The example in Listing 2 shows how to drop files or text on a |
| table widget.</p> |
| <table border="1" cellspacing="0" cellpadding="0" style="width:680; |
| border-collapse:collapse;border:medium none;"> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border-top:solid windowtext .5pt; |
| border-left:solid windowtext .5pt;border-bottom:none;border-right:none; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt1C" href="#_dt1D">1</a></td> |
| <td valign="top" style="width:1060;border-top:.5pt solid windowtext; |
| border-left:medium none;border-bottom:medium none;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>import |
| org.eclipse.swt.dnd.*;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">2</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> </td> |
| <code></code> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt3C" href="#_dt3D">3</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code><font color="#0080C0">// |
| Enable a table as a Drop Target</font></code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt3D">4</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>final |
| Table dropTable = new Table(shell, SWT.BORDER);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt3D">5</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>for |
| (int i = 0; i < 10; i++) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt3D">6</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| TableItem item = new TableItem(dropTable, SWT.NONE);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt3D">7</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| item.setText("item" + I);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt3D">8</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>}</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">9</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code></code> </td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt10C" href="#_dt10D">10</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code><font color="#0080C0">// |
| Allow data to be copied or moved to the drop target</font></code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt10D">11</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>operations |
| = DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt10D">12</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>DropTarget |
| target = new DropTarget(dropTable, operations);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">13</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code></code> </td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt14C" href="#_dt14D">14</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code><font color="#0080C0">// |
| Receive data in Text or File format</font></code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt14D">15</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>final |
| TextTransfer textTransfer = TextTransfer.getInstance();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt14D">16</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>final |
| FileTransfer fileTransfer = FileTransfer.getInstance();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt14D">17</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>types |
| = new Transfer[] {fileTransfer, textTransfer};</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt14D">18</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>target.setTransfer(types);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">19</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code></code> </td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt20C" href="#_dt20D">20</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>target.addDropListener(new |
| DropTargetListener() {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt21C" href="#_dt21D">21</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| public void dragEnter(DropTargetEvent event) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt22C" href="#_dt22D">22</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if (event.detail == DND.DROP_DEFAULT) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt22D">23</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if ((event.operations & DND.DROP_COPY) != 0) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt22D">24</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| event.detail = DND.DROP_COPY;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt22D">25</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| } else {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt22D">26</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| event.detail = DND.DROP_NONE;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt22D">27</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt22D">28</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt29C" href="#_dt29D">29</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code><font color="#0080C0"> |
| // will accept text but prefer to have files dropped</font></code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">30</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| for (int i = 0; i < event.dataTypes.length; i++) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">31</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if (fileTransfer.isSupportedType(event.dataTypes[i])){</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">32</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| event.currentDataType = event.dataTypes[i];</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">33</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| <font color="#0080C0">// files should only be copied</font></code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">34</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if (event.detail != DND.DROP_COPY) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">35</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| event.detail = DND.DROP_NONE;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">36</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">37</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| break;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">38</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt29D">39</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">40</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt41C" href="#_dt41D">41</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| public void dragOver(DropTargetEvent event) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt42C" href="#_dt42D">42</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt43C" href="#_dt43D">43</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if |
| (textTransfer.isSupportedType(event.currentDataType)) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt43D">44</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| |
| <font color="#0080C0">// NOTE: on unsupported platforms this will return null</font></code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt43D">45</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| Object o = textTransfer.nativeToJava(event.currentDataType);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt43D">46</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| String t = (String)o;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt43D">47</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if (t != null) System.out.println(t);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt43D">48</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">50</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt51C" href="#_dt51D">51</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| public void dragOperationChanged(DropTargetEvent event) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">52</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if (event.detail == DND.DROP_DEFAULT) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">53</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if ((event.operations & DND.DROP_COPY) != 0) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">54</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| event.detail = DND.DROP_COPY;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">55</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| } else {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">56</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| event.detail = DND.DROP_NONE;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">57</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">58</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">59</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| <font color="#0080C0">// allow text to be moved |
| but files should only be copied</font></code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">60</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if |
| (fileTransfer.isSupportedType(event.currentDataType)){</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">61</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if (event.detail != |
| DND.DROP_COPY) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">62</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| event.detail |
| = DND.DROP_NONE;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">63</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">64</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt51D">65</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt66C" href="#_dt66D">66</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| public void dragLeave(DropTargetEvent event) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt66D">67</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt68C" href="#_dt68D">68</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| public void dropAccept(DropTargetEvent event) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt68D">69</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_dt70C" href="#_dt70D">70</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| public void drop(DropTargetEvent event) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">71</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if |
| (textTransfer.isSupportedType(event.currentDataType)) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">72</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| String text = |
| (String)event.data;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">73</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| TableItem item = new |
| TableItem(dropTable, SWT.NONE);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">74</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| item.setText(text);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">75</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">76</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| if |
| (fileTransfer.isSupportedType(event.currentDataType)){</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">77</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| String[] files = |
| (String[])event.data;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">78</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| for (int i = 0; i < |
| files.length; i++) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">79</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| TableItem |
| item = new TableItem(dropTable, SWT.NONE);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">80</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| item.setText(files[i]);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">81</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">82</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_dt70D">83</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:1060;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border-top:none;border-left:solid windowtext .5pt; |
| border-bottom:solid windowtext .5pt;border-right:none;padding:0in 5.4pt 0in 5.4pt">84</td> |
| <td valign="top" style="width:1060;border-top:medium none;border-left: |
| medium none;border-bottom:.5pt solid windowtext;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>});</code></td> |
| </tr> |
| </table> |
| <p align="left">Listing 2: Drop text or files on a table widget |
| <p align="justify"><a name="_dt1D" href="#_dt1C"><b>Line 1:</b></a><br> |
| All the related drag and drop classes are defined in the package |
| org.eclipse.swt.dnd.</p> |
| <p align="justify"><a name="_dt3D" href="#_dt3C"><b>Lines 3 to 8:</b></a><br> |
| Create a widget. The user drags the data over a target, which in user |
| interface terms is some visible widget. In our example, the user can drop the |
| data on a table. Note that you cannot have multiple drop targets on one |
| widget. If you try to create a second drop target, an SWTError will be thrown.</p> |
| <p align="justify"><a name="_dt10D" href="#_dt10C"><b>Lines 10 to 12:</b></a><br> |
| Define the types of operations that this drop target is likely to perform on |
| any data dropped on it. This is a bitwise OR combination of any of |
| DND.DROP_COPY, DND.DROP_MOVE, or DND.DROP_LINK. By default, if no operations |
| are defined, the DND.DROP_MOVE operation is assumed.</p> |
| <p align="justify">The operation may also include DND.DROP_DEFAULT (Note: the |
| DND.DROP_DEFAULT style must be combined with one or more of the other |
| DND.DROP_* styles). The DND.DROP_DEFAULT style allows the drop target to |
| determine the default operation the default operation is what happens when |
| no modifier keys are pressed. If the DND.DROP_DEFAULT style is NOT specified, |
| the default operation will be DND.DROP_MOVE. See also dragEnter and |
| dragOperationChanged below.</p> |
| <p align="justify"><a name="_dt14D" href="#_dt14C"><b>Lines 14 to 18:</b></a><br> |
| Define the types of data that this drop target will accept. A data type is |
| defined by a subclass org.eclipse.swt.dnd.Transfer such as TextTransfer or |
| FileTransfer. For a detailed description of Transfer types see <a href="#_Transfer">Transfer</a>. |
| A drop target can be receptive to more than one type of data. The current 2.1 |
| implementation will, however, only allow one format to be retrieved in the |
| final drop. That is to say, the drop target can indicate that it is interested |
| in both text and RTF text, but only one of these is provided in the drop event |
| either text or RTF text. The advantage of registering for both formats is |
| that some applications may only provide text and some may only provide RTF |
| text. If an application provides both, you can choose which format you would |
| prefer to receive. See dragEnter below.</p> |
| <p align="justify"><a name="_dt20D" href="#_dt20C"><b>Line 20:</b></a><br> |
| Once the drop target is defined, a mechanism is required for it to interact |
| with the Drag and Drop operation. Adding a DropTargetListener does this.</p> |
| <p align="justify">The following event sequences may occur:</p> |
| <ul> |
| <li>dragEnter, dragLeave</li> |
| <li>dragEnter, one or more dragOver *, dragLeave</li> |
| <li>dragEnter, one or more dragOver *, dragLeave, dropAccept</li> |
| <li>dragEnter, one or more dragOver *, dragLeave, dropAccept, drop</li> |
| </ul> |
| <p>*may be a mixture of dragOver and dragOperationChanged</p> |
| <p align="justify"><a name="_dt21D" href="#_dt21C"><b>Line 21 to 40:</b></a><br> |
| The dragEnter event occurs when a drag and drop operation is in progress and |
| the cursor enters the bounds of the drop target widget. If the cursor leaves |
| the bounds of the widget and re-enters, another dragEnter is issued.</p> |
| <p align="justify"><a name="_dt22D" href="#_dt22C"><b>Lines 22 to 28:</b></a><br> |
| A drag over effect is a visual cue to the user about what kind of operation |
| will be performed when the drop occurs. The exact appearance of the visual cue |
| is platform dependant some examples are shown in Figure 2. The drop target |
| can update this drag over effect by setting the event.detail field to one of |
| DND.DROP_COPY, DND.DROP_MOVE, DND.DROP_LINK or DND.DROP_NONE. The value set in |
| the event.detail field must be one of the values defined in the |
| event.operations field, which is a bitwise OR of the operations supported by |
| the DragSource. If a value is chosen that is not allowed by the DragSource, |
| the operation would be set to DND.DROP_NONE. The event.detail field can also |
| be updated in the dragOver, dragOperationChanged, dropAccept and drop events.</p> |
| <p align="justify">In dragEnter, the application can define the default |
| operation. As discussed above, if the drop target is created with the style |
| DND.DROP_DEFAULT, it will be notified when there are no user modifier keys |
| pressed. In this case, the event.detail field in the dragEnter event is set to |
| DND.DROP_DEFAULT. The application can specify the default operation by |
| changing the event.detail field to the desired operation. If the application |
| does not change the event.detail field from DND.DROP_DEFAULT to some |
| operation, it will by default be changed to DND.DROP_MOVE. The |
| DND.DROP_DEFAULT value is also set in the dragOperationChanged event.</p> |
| <p align="justify">In our example, we make Copy the default operation if it is |
| allowed by the drag source.</p> |
| <table border="1" cellspacing="0" cellpadding="2" style="border-collapse:collapse; |
| border:none;" width="30%"> |
| <tr> |
| <th valign="top" width="50%"> |
| <p>Operation</p> |
| </th> |
| <th valign="top" width="50%">Win32 cursor</th> |
| </tr> |
| <tr> |
| <td valign="top" width="50%" align="center">Move</td> |
| <td valign="top" width="50%" align="center"><img border="0" width="21" height="31" src="images/image004.jpg"></td> |
| </tr> |
| <tr> |
| <td valign="top" width="50%" align="center">Copy</td> |
| <td valign="top" width="50%" align="center"><img border="0" width="26" height="38" src="images/image006.jpg"></td> |
| </tr> |
| <tr> |
| <td valign="top" width="50%" align="center">Link</td> |
| <td valign="top" width="50%" align="center"><img border="0" width="27" height="38" src="images/image008.jpg"></td> |
| </tr> |
| <tr> |
| <td valign="top" width="50%" align="center">None</td> |
| <td valign="top" width="50%" align="center"><img border="0" width="22" height="22" src="images/image010.jpg"></td> |
| </tr> |
| </table> |
| <p align="left">Figure 2: Cursors for the allowed transfer operations |
| <p align="justify"><a name="_dt29D" href="#_dt29C"><b>Lines 29 to 39:</b></a><br> |
| The drop target can choose what type of data it would prefer to receive. The |
| dragEnter event has two fields for this, event.currentType, which is the type |
| of data preferred by the application (represented by a TransferData object), |
| and event.dataTypes, which is the list of types provided by the drag source |
| (represented by an array of TransferData objects). You can set the |
| event.currentType to any value in the event.dataTypes. These fields can also |
| be modified in the dragOver, dragOperationChanged, and dropAccept events.</p> |
| <p align="justify">In the example, we are allowing Text or Files to be dropped |
| on the table, but if both are available, we prefer to get the Files. If a file |
| is being transferred, we also have restricted the operation to allow only copy |
| (we dont want you to delete files from your operating system when you play |
| with this example :-)).</p> |
| <p align="justify"><a name="_dt41D" href="#_dt41C"><b>Lines 41 to 50:</b></a><br> |
| The dragOver event occurs repeatedly as the user drags the cursor over the |
| drop target widget. If the cursor is motionless, the dragOver event will |
| continue to be received at regular intervals. In addition to what is shown in |
| the example, you can modify the event.detail or event.currentType fields. This |
| is most often done with a table or tree when the operation changes based on |
| what item you are over. For example, you may have a tree representing the file |
| system and you may allow files to be dropped on folders but not on other |
| files. The event.item field will indicate what item you are over in a table or |
| tree.</p> |
| <p align="justify"><a name="_dt42D" href="#_dt42C"><b>Line 42:</b></a><br> |
| A drag under effect is some visual cue or action in the drop target widget |
| that gives the user more detailed feedback about where the drop may occur. The |
| application can control the drag under effect by setting the event.feedback |
| field as shown in Table 2.</p> |
| <table border="1" cellspacing="0" width="90%" cellpadding="2"> |
| <tr> |
| <th align="center" valign="top">dragOver event.feedback values</th> |
| <th align="center" valign="top">Description</th> |
| </tr> |
| <tr> |
| |
| <td height="24" align="left" valign="top">DND.FEEDBACK_SELECT</td> |
| <td align="left" valign="top">The item under the cursor is selected; |
| applies to table and trees.</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">DND.FEEDBACK_SCROLL</td> |
| <td align="left" valign="top">The widget is scrolled up or down to allow |
| the user to drop on items that are not currently visible; applies to |
| tables and trees.</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">DND.FEEDBACK_EXPAND</td> |
| <td align="left" valign="top">The item currently under the cursor is |
| expanded to allow the user to select a drop target from a sub item; |
| applies to trees.</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">DND.FEEDBACK_INSERT_BEFORE</td> |
| <td align="left" valign="top">An insertion mark is shown before the item |
| under the cursor; applies to trees.</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">DND.FEEDBACK_INSERT_AFTER</td> |
| <td align="left" valign="top">An insertion mark is shown after the item |
| under the cursor; applies to trees.</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">DND.FEEDBACK_NONE</td> |
| <td align="left" valign="top">No effect is shown.</td> |
| </tr> |
| </table> |
| <p align="left">Table 2: drag under effect types |
| <p align="justify"><a name="_dt43D" href="#_dt43C"><b>Lines 43 to 49:</b></a><br> |
| When dragging data over the target, the information provided in the event |
| tells you what type of data is being dragged but does not give the content of |
| the data. For example, the event.currentType may indicate that a file is being |
| dragged but the event does not indicate the name of the file or the extension |
| of the file. If your application will perform a different operation for a Java |
| file versus a text file, then you might want to get the data in the dragOver |
| event. Unfortunately this is not supported on all platforms. As of 2.1, it is |
| only possible to access the data in the dragOver event on Windows. The data |
| can be accessed by passing the event.currentType TransferData object to the |
| nativeToJava method of the corresponding Transfer object. On all platforms |
| except Windows, this will return null. In the future, this capability may be |
| extended to other platforms where supported.</p> |
| <p align="justify">(Note: in 1.0 through 2.1, you can only get the data for |
| event.currentType but in 3.0, you can get the data for any type in |
| event.dataTypes).</p> |
| <p align="justify"><a name="_dt51D" href="#_dt51C"><b>Lines 51 to 65:</b></a><br> |
| The dragOperationChanged event occurs when the user presses or releases a |
| modifier key (such as Ctrl, Shift, Command, Option). The modifier keys are |
| used to switch the operation to be performed. For example, on Windows when |
| just the Ctrl key is down, a copy is requested, when the Ctrl and Shift keys |
| are both down, a link is requested and when just the Shift key is down, a move |
| is requested. When no modifier keys are pressed, the default operation is |
| requested. See the dragEnter event for more details.</p> |
| <p align="justify"><a name="_dt66D" href="#_dt66C"><b>Lines 66 to 67:</b></a><br> |
| The dragLeave event occurs when the cursor moves outside of the drop target |
| widget. If you allocated any resources in dragEnter, you should free them in |
| dragLeave. The dragLeave event also occurs if the user cancels the Drag and |
| Drop operation by hitting Escape, and just before a drop is performed.</p> |
| <p align="justify"><a name="_dt68D" href="#_dt68C"><b>Lines 68 to 69:</b></a><br> |
| The dropAccept event provides the application with one last chance to define |
| the type of data that will be returned in the drop event. This is done by |
| setting the event.currentDataType to one of the values defined in |
| event.dataTypes.</p> |
| <p align="justify"><a name="_dt70D" href="#_dt70C"><b>Lines 70 to 83:</b></a><br> |
| The drop event occurs when the user releases the mouse over the drop target if |
| a valid operation and currentDataType were requested in the previous events. |
| The event.data field contains the data requested. The object type contained in |
| the event.data field depends on what Transfer type was requested. The data is |
| of the type defined in the event.currentDataType field.</p> |
| <p align="justify">When the drop operation is completed, update the |
| event.detail field with the operation performed.</p> |
| <h2><a name="_Using_the_Clipboard"></a>Clipboard</h2> |
| <p align="justify">Drag and drop allows the simultaneous transfer of data |
| between a source and a target but sometimes the user may wish to copy data to |
| be transferred at a later point in time. The Clipboard acts like a temporary |
| holder for the data. In addition, the same data may be copied to multiple |
| targets using the clipboard.</p> |
| <p align="justify">In the following example, we will copy data in two |
| different formats onto the clipboard and retrieve one of the formats from the |
| clipboard.</p> |
| <table border="1" cellspacing="0" cellpadding="0" style="width:650" width="650"> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border-top:solid windowtext .5pt; |
| border-left:solid windowtext .5pt;border-bottom:none;border-right:none; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_cb1C" href="#_cb1D">1</a></td> |
| <td valign="top" style="width:850;border-top:.5pt solid windowtext; |
| border-left:medium none;border-bottom:medium none;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"><code>import |
| org.eclipse.swt.dnd.*;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">2</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code>. . .</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">3</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code>public static void main(String[] args) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">4</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> Display display = new Display();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_cb5C" href="#_cb5D">5</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> final Clipboard cb = new Clipboard(display);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">6</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> Shell shell = new Shell(display);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">7</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> final Text text = new Text(shell, SWT.BORDER | SWT.MULTI);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">8</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> text.setBounds(10, 10, 300, 300);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">9</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> Button button = new Button(shell, SWT.PUSH);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">10</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> button.setText("Copy");</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">11</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> button.setBounds(320, 10, 100, 40);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">12</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> button.addListener(SWT.Selection, new Listener() {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">13</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> public void handleEvent(Event e) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_cb14C" href="#_cb14D">14</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> String textData = text.getSelectionText();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb14D">15</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> if (textData == null) return;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb14D">16</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> <font color="#0080C0">// to show the rtf formatting, make the text bold and italic</font></code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb14D">17</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> String rtfData = "{\\rtf1\\b\\i " + textData + "}";</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb14D">18</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> TextTransfer textTransfer = TextTransfer.getInstance();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb14D">19</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> RTFTransfer rtfTransfer = RTFTransfer.getInstance();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb14D">20</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> Transfer[] types = new Transfer[]{textTransfer, rtfTransfer};</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb14D">21</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> cb.setContents(new Object[]{textData, rtfData}, types);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">22</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">23</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> });</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">24</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> button = new Button(shell, SWT.PUSH);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">25</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> button.setText("Paste");</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">26</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> button.setBounds(320, 60, 100, 40);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">27</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> button.addListener(SWT.Selection, new Listener() {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">28</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> public void handleEvent(Event e) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_cb29C" href="#_cb29D">29</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> TextTransfer transfer = TextTransfer.getInstance();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb29D">30</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> String data = (String)cb.getContents(transfer);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb29D">31</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> if (data == null) return;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a href="#_cb29D">32</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> text.insert(data);</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">33</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">34</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> });</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">35</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> shell.open();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">36</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> while (!shell.isDisposed()) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">37</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> if (!display.readAndDispatch())</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">38</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> display.sleep();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">39</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code></code> </td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">40</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt"><a name="_cb41C" href="#_cb41D">41</a></td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> cb.dispose();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border:none;border-left:solid windowtext .5pt; |
| padding:0in 5.4pt 0in 5.4pt">42</td> |
| <td valign="top" style="border-left:medium none; border-top:medium none; border-bottom:medium none; width:850;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code> display.dispose();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width:23.4pt;border-top:none;border-left:solid windowtext .5pt; |
| border-bottom:solid windowtext .5pt;border-right:none;padding:0in 5.4pt 0in 5.4pt">43</td> |
| <td valign="top" style="width:850;border-top:medium none;border-left:medium none; |
| border-bottom:.5pt solid windowtext;border-right:.5pt solid windowtext; |
| padding-left:5.4pt; padding-right:5.4pt; padding-top:0in; padding-bottom:0in"> |
| <code>}</code></td> |
| </tr> |
| </table> |
| <p align="left">Listing 3: Using the clipboard to copy text |
| <p align="justify"><a name="_cb1D" href="#_cb1C"><b>Line 1:</b></a><br> |
| All the related drag and drop classes are defined in the package |
| org.eclipse.swt.dnd.</p> |
| <p align="justify"><a name="_cb5D" href="#_cb5C"><b>Line 5:</b></a><br> |
| Create a clipboard object. A Clipboard object gives you access to the |
| operating system clipboard. It will allow you to exchange data within your |
| application or with other applications. Note: A Clipboard object uses system |
| resources and must be released when you are finished (see line 41). You can |
| choose to create a new clipboard object each time you want to access the data |
| on the clipboard or you can keep an instance around for your application.</p> |
| <p align="justify"><a name="_cb14D" href="#_cb14C"><b>Lines 14 to 21:</b></a><br> |
| Copy the text selected in the Text widget onto the clipboard. If no text is |
| selected, do nothing.</p> |
| <p>When placing data on the clipboard, it is possible to make the data |
| available in more than one format. In our example, we are using both Text and |
| RTF Text formats. This makes it possible for our application to interact with |
| a larger variety of applications. That is, if we only place RTF text on the |
| clipboard, then we cannot interact with an application such as Notepad that |
| does not understand RTF text. To better integrate your application into the |
| environment, make your data available in as many useful forms as possible.</p> |
| <p>Each successful call to Clipboard.setContents will clear any previous |
| content from the clipboard. This applies not only to the data formats you are |
| placing on the clipboard but to all data formats. For example, if the |
| clipboard contains File data placed there by some other application and you |
| call Clipboard.setContents with Text data, the File data will no longer be |
| available. If you want to have multiple kinds of data available on the |
| clipboard at the same time, you must pass them to the clipboard in the same |
| Clipboard.setContents call. The Clipboard.setContents API takes an array of |
| data objects and an array of data types. The values for the data objects must |
| be in the same order as the data types and must be valid for the corresponding |
| data type (that is, a TextTransfer expects a String, a File Transfer expects a |
| String[] - the javadoc for each type should specify the expected format of the |
| data).</p> |
| <p>The data that you place on the clipboard will be available even after your |
| application is closed. (Note: GTK is an exception to this. Currently, there is |
| no mechanism in GTK to persist the data beyond the life time of the |
| application.)</p> |
| <p>On some platforms, there are actually multiple clipboards available. On |
| Unix/Linux there is a PRIMARY clipboard which is supposed to contain the data |
| that was most recently selected (implicitly set by the act of selection) and |
| there is a CLIPBOARD clipboard which is supposed to contain data that was |
| explicitly set through a keyboard accelerator (such as CTRL+Insert) or through |
| a menu item (there are also other clipboards but these are used infrequently). |
| On GTK and Motif, you can use <code>DND.CLIPBOARD</code> and |
| <code>DND.SELECTION_CLIPBOARD</code> when setting and getting clipboard data |
| to target a specific one. On Mac OS X, SWT supports the default Scrap.</p> |
| <p><a name="_cb29D" href="#_cb29C"><b>Lines 29 to 32:</b></a><br> |
| If there is Text available on the clipboard, insert it into the text widget.</p> |
| <p>To request data of a certain type, call Clipboard.getContents with a |
| Transfer subclass of the appropriate type. In our example, we are pasting Text |
| and have used the TextTransfer class. If there is no data of this type |
| available, null will be returned. The type of object returned by |
| Clipboard.getContents will depend on the Transfer class used. The javadoc for |
| the Transfer subclass should specify the Java object type.</p> |
| <p><a name="_cb41D" href="#_cb41C"><b>Line 41:</b></a><br> |
| Dispose of the clipboard. As mentioned above, failure to dispose the clipboard |
| will result in system resources being leaked.</p> |
| <h3>NEW for 3.0 How to query data types on the Clipboard</h3> |
| <p>In 2.1 and earlier releases of SWT, the only mechanism available to |
| determine if a specific data type is available on the clipboard is to use |
| Clipboard.getContents and actually transfer the data. In addition to being |
| slow, this mechanism can cause problems when a "Cut" operation is |
| being performed. In a "Cut" operation, one application puts data on |
| the clipboard and when that data is transferred from the clipboard, the |
| original copy of the data is deleted. In 3.0, there will be new API to query |
| what types of data are on the clipboard without actually transferring the data |
| to your application. An example of how to use it is shown in Listing 4.</p> |
| <table border="1" cellpadding="0" cellspacing="0" width="650"> |
| <tr> |
| <td width="31" valign="top" style="width: 23.4pt; border-left: .5pt solid windowtext; border-right-style: none; border-right-width: medium; border-top-style: none; border-top-width: medium; border-bottom: .5pt none windowtext; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17">1</td> |
| <td valign="top" style="width: 658; border-left-style: none; border-left-width: medium; border-right: .5pt solid windowtext; border-top-style: none; border-top-width: medium; border-bottom-style: none; border-bottom-width: medium; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17"><code>TransferData[] |
| available = cb.getAvailableTypes();</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width: 23.4pt; border-left: .5pt solid windowtext; border-right-style: none; border-right-width: medium; border-top-style: none; border-top-width: medium; border-bottom: .5pt none windowtext; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17">2</td> |
| <td valign="top" style="width: 658; border-left-style: none; border-left-width: medium; border-right: .5pt solid windowtext; border-top-style: none; border-top-width: medium; border-bottom-style: none; border-bottom-width: medium; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17"><code>boolean |
| enabled = false;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width: 23.4pt; border-left: .5pt solid windowtext; border-right-style: none; border-right-width: medium; border-top-style: none; border-top-width: medium; border-bottom: .5pt none windowtext; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17">3</td> |
| <td valign="top" style="width: 658; border-left-style: none; border-left-width: medium; border-right: .5pt solid windowtext; border-top-style: none; border-top-width: medium; border-bottom-style: none; border-bottom-width: medium; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17"><code>for |
| (int i = 0; i < available.length; i++) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width: 23.4pt; border-left: .5pt solid windowtext; border-right-style: none; border-right-width: medium; border-top-style: none; border-top-width: medium; border-bottom: .5pt none windowtext; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17">4</td> |
| <td valign="top" style="width: 658; border-left-style: none; border-left-width: medium; border-right: .5pt solid windowtext; border-top-style: none; border-top-width: medium; border-bottom-style: none; border-bottom-width: medium; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17"><code> |
| if (TextTransfer.getInstance().isSupportedType(available[i])) {</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width: 23.4pt; border-left: .5pt solid windowtext; border-right-style: none; border-right-width: medium; border-top-style: none; border-top-width: medium; border-bottom: .5pt none windowtext; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17">5</td> |
| <td valign="top" style="width: 658; border-left-style: none; border-left-width: medium; border-right: .5pt solid windowtext; border-top-style: none; border-top-width: medium; border-bottom-style: none; border-bottom-width: medium; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17"><code> |
| enabled = true;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width: 23.4pt; border-left: .5pt solid windowtext; border-right-style: none; border-right-width: medium; border-top-style: none; border-top-width: medium; border-bottom: .5pt none windowtext; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17">6</td> |
| <td valign="top" style="width: 658; border-left-style: none; border-left-width: medium; border-right: .5pt solid windowtext; border-top-style: none; border-top-width: medium; border-bottom-style: none; border-bottom-width: medium; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17"><code> |
| break;</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width: 23.4pt; border-left: .5pt solid windowtext; border-right-style: none; border-right-width: medium; border-top-style: none; border-top-width: medium; border-bottom: .5pt none windowtext; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17">7</td> |
| <td valign="top" style="width: 658; border-left-style: none; border-left-width: medium; border-right: .5pt solid windowtext; border-top-style: none; border-top-width: medium; border-bottom-style: none; border-bottom-width: medium; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17"><code> |
| }</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width: 23.4pt; border-left: .5pt solid windowtext; border-right-style: none; border-right-width: medium; border-top-style: none; border-top-width: medium; border-bottom: .5pt none windowtext; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17">8</td> |
| <td valign="top" style="width: 658; border-left-style: none; border-left-width: medium; border-right: .5pt solid windowtext; border-top-style: none; border-top-width: medium; border-bottom-style: none; border-bottom-width: medium; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="17"><code>}</code></td> |
| </tr> |
| <tr> |
| <td width="31" valign="top" style="width: 23.4pt; border-left: .5pt solid windowtext; border-right-style: none; border-right-width: medium; border-top-style: none; border-top-width: medium; border-bottom: .5pt solid windowtext; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="18">9</td> |
| <td valign="top" style="width: 658; border-left-style: none; border-left-width: medium; border-right: .5pt solid windowtext; border-top-style: none; border-top-width: medium; border-bottom-style: none; border-bottom-width: medium; padding-left: 5.4pt; padding-right: 5.4pt; padding-top: 0in; padding-bottom: 0in" height="18"><code>pasteMenuItem.setEnabled(enabled);</code></td> |
| </tr> |
| </table> |
| <p align="left">Listing 4: Query the data types available on the clipboard. |
| <p>Clipboard.getAvailableTypes returns an array of TransferData objects. A |
| TransferData object contains platform specific information that represents a |
| data type. While the fields of the TransferData object are public, do not |
| attempt to interpret them directly. Instead use the |
| "isSupportedType" method of any subclass of Transfer as shown in |
| line 4.</p> |
| <h2><a name="_Transfer"></a>Transfer</h2> |
| <p>Transfer is an abstract class that provides a mechanism for converting |
| between a Java representation of data and a platform specific representation |
| of data and vice versa. The Java representation of the data is the currency |
| the application uses. For example, text is represented by a String object. The |
| platform specific representation is the currency of the operating system and |
| is represented in SWT by the TransferData object. Table 3 shows the subclasses |
| of Transfer provided in org.eclipse.swt.dnd.</p> |
| <table border="1" cellpadding="2" cellspacing="0" width="90%"> |
| <tr> |
| <th width="15%" align="center">Transfer</th> |
| <th width="20%" align="center">Java format</th> |
| <th width="60%" align="center">Example</th> |
| </tr> |
| <tr> |
| <td width="15%"><code>TextTransfer</code></td> |
| <td width="20%"><code>String</code></td> |
| <td width="60%"><code>"hello world"</code></td> |
| </tr> |
| <tr> |
| <td width="15%"><code>RTFTransfer</code></td> |
| <td width="20%"><code>String</code></td> |
| <td width="60%"><code>"{\\rtf1\\b\\i hello world}"</code></td> |
| </tr> |
| <tr> |
| <td width="15%"><code>FileTransfer</code></td> |
| <td width="20%"><code>String[]</code></td> |
| <td width="60%"><code>new String[] {file1.getAbsolutePath(), |
| file2.getAbsolutePath()}</code></td> |
| </tr> |
| </table> |
| <p align="left">Table 3: Transfer types provided by SWT |
| <p>The TransferData class contains public fields that are platform-specific. |
| Because the fields in TransferData vary from platform to platform, |
| applications should not access them. The purpose of making the fields public |
| is to allow developers to extend the Transfer class and provide additional |
| platform specific types for data transfer (e.g., bitmap images or wave files).</p> |
| <h2>Summary</h2> |
| <p>This article describes the SWT mechanism for transferring data either via |
| Drag and Drop or using the Clipboard. SWT uses the underlying operating system |
| mechanism which allows data transfer across applications for maximum system |
| integration. SWT provides standard data transfer types as well as an |
| infrastructure for defining your own transfer types or supporting additional |
| platform-defined data types.</p> |
| <p><small>Java and all Java-based trademarks and logos are trademarks or registered trademarks of Sun |
| Microsystems, Inc. in the United States, other countries, or both.</small></p> |
| </body> |
