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| <td ALIGN=left VALIGN=top COLSPAN="2" BGCOLOR="#0080c0"><b><font face="Arial,Helvetica"><font color="#ffffff"> Eclipse |
| Corner Article</font></font></b></td> |
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| <h1> <img SRC="../../images/Idea.jpg" height=86 width=120 align=center></h1> |
| <center> |
| <h1> Getting Started with SWT</h1> |
| </center> |
| <center> |
| <h3> Exploring the features of the Eclipse Standard Widget Toolkit</h3> |
| </center> |
| <blockquote><b>Summary</b> <br> |
| This article contains several examples that show how to use the features of |
| the Eclipse Widget toolkit, SWT. Each example builds upon the ones before. The |
| first example shows how to create an empty window. The second example adds some |
| buttons to the window. The third example registers a listener for events on |
| one of the buttons.</blockquote> |
| <p> |
| <hr WIDTH="100%"> |
| <br> |
| <p>The examples below show how to use SWT to create stand-alone applications, |
| and provide a good basis for experimenting with SWT. The Eclipse Workbench defines |
| the UI paradigm and how editors and views are integrated. It provides the display |
| and shell that are created below so you don't need to create them for you Workbench |
| plug-in user interfaces.</p> |
| <p>For further details on SWT, take a look at the <a href="swt-widget-hierarchy.html">widget |
| hierarchy</a> and <a href="swt-style-bits.html">supported style bits</a>. Then |
| try modifying the example below with different widgets, styles, and actions.</p> |
| <h2> <a NAME="BM2_1_Example_1__Creating_your_first_win"></a>Creating your first |
| window</h2> |
| <pre>// Create a shell. |
| Display display = new Display(); // The "parent" of a shell is the display it is created on. |
| |
| Shell shell = |
| |
| |
| |
| |
| |
| new Shell (display); // Create the top level window. |
| shell.open (); // Open it |
| |
| // This is the event loop. |
| |
| while (!shell.isDisposed ()) |
| if (!display.readAndDispatch ()) display.sleep ();</pre> |
| <h2> <a NAME="BM2_2_Example_2__Adding_a_widget"></a><b>Adding a widget</b></h2> |
| This example builds upon the first example and adds two buttons: A push button |
| and a check box. Notice how the constructors in SWT require you to pass the parent |
| widget and style bits. Style bits are used to specify values required to create |
| the underlying OS resource. In this case it specifies the type of button to create. |
| The code added by this example is marked in <i>italic.</i> |
| <pre>Display display = new Display(); |
| |
| Shell shell = new Shell (display); |
| |
| <i>Button b1 = new Button (shell, SWT.PUSH); |
| b1.setText ("Button 1"); |
| b1.setBounds (0, 0, 100, 60); |
| Button b2 = |
| |
| |
| |
| |
| |
| new Button (shell, SWT.CHECK); |
| b2.setText ("Button 2"); |
| b2.setBounds (0, 60, 100, 45); |
| |
| </i>shell.open (); |
| while (!shell.isDisposed ()) |
| if (!display.readAndDispatch ()) display.sleep ();</pre> |
| <h2> <a NAME="BM2_3_Example_3__Adding_Event_Handlers"></a>Adding event handlers</h2> |
| Event handling is done by registering listeners in the same way as in AWT. The |
| code added by this example is marked in <i>italic.</i> |
| <pre>Shell shell = new Shell (); |
| Button b1 = new Button (shell, SWT.PUSH); |
| b1.setText ("Button 1"); |
| b1.setBounds (0, 0, 100, 60); |
| |
| <i>b1.addMouseListener(new MouseListener() { |
| public void mouseDown(MouseEvent e) { |
| System.out.println("mouseDown:"); |
| }; |
| public void mouseDoubleClick(MouseEvent e) { |
| System.out.println("mouseDoubleClick:"); |
| }; |
| public void mouseUp(MouseEvent e) { |
| System.out.println("mouseUp:"); |
| }; |
| }); |
| |
| </i>Button b2 = new Button (shell, SWT.CHECK); |
| b2.setText ("Button 2"); |
| b2.setBounds (0, 60, 100, 45); |
| shell.open (); |
| <a NAME="BM2_4_LayoutManagers_in_SWT"></a> |
| Display display = |
| |
| shell.getDisplay (); |
| while (!shell.isDisposed ()) |
| if (!display.readAndDispatch ()) display.sleep ();</pre> |
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