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| <td bgcolor="#000080" colspan="2"><b><font color="#FFFFFF">Example 4 |
| - Connections and Anchors</font></b></td> |
| </tr> |
| <tr> |
| <td><br> |
| This example shows how to use Connections and ConnectionAnchors. |
| A connection is a figure that visually connects two anchors. The |
| anchors are usually places on figures which the connection is linking.<p> |
| The red and blue "nodes" can be dragged around with the mouse. |
| The connection will re-route itself automatically. The connections |
| children, the "Midpoint" label and the arrowhead, will also update.</p> |
| <p>The connection implementation used here is a PolylineConnection. |
| This implementation supports decorations, such as arrowheads. |
| PolygonDecorations added to the connection will be rotated correctly |
| by a Locator. Other decorations can be added with their own locators, |
| such as the "Midpoint" label in the demo.<br> |
| </p> |
| </td> |
| <td><img border="0" src="demo4.gif" width="243" height="245"></td> |
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| <pre><font size="2" color="#000084">import</font><font size="2"> org.eclipse.swt.SWT;</font><font size="2" color="#000084"> |
| import</font><font size="2"> org.eclipse.swt.widgets.Shell; |
| </font><font size="2" color="#000084">import</font><font size="2"> org.eclipse.swt.widgets.Display;</font><font size="2" color="#000084"> |
| import</font><font size="2"> org.eclipse.draw2d.*;</font><font size="2" color="#000084"> |
| import</font><font size="2"> org.eclipse.draw2d.geometry.*; |
| </font><font size="2" color="#000084"> |
| public</font><font size="2"> </font><font size="2" color="#000084">class</font><font size="2"> Demo4 { |
| </font><font size="2" color="#000084"> |
| public</font><font size="2"> </font><font size="2" color="#000084">static</font><font size="2"> </font><font size="2" color="#000084">void</font><font size="2"> main(String args[]){ |
| Shell shell = </font><font size="2" color="#000084">new</font><font size="2"> Shell(); |
| shell.setSize(350,350); |
| shell.open(); |
| shell.setText(</font><font size="2" color="#008484">"Demo 4"</font><font size="2">); |
| LightweightSystem lws = </font><font size="2" color="#000084">new</font><font size="2"> LightweightSystem(shell); |
| IFigure panel = </font><font size="2" color="#000084">new</font><font size="2"> Figure(); |
| lws.setContents(panel); |
| RectangleFigure |
| node1 = </font><font size="2" color="#000084">new</font><font size="2"> RectangleFigure(), |
| node2 = </font><font size="2" color="#000084">new</font><font size="2"> RectangleFigure(); |
| node1.setBackgroundColor(ColorConstants.red); |
| node1.setSize(64, 36); |
| node2.setBackgroundColor(ColorConstants.blue); |
| node2.setLocation(</font><font size="2" color="#000084">new</font><font size="2"> Rectangle(100, 100, 64, 36)); |
| |
| PolylineConnection conn = </font><font size="2" color="#000084">new</font><font size="2"> PolylineConnection(); |
| conn.setSourceAnchor(</font><font size="2" color="#000084">new</font><font size="2"> ChopboxAnchor(node1)); |
| conn.setTargetAnchor(</font><font size="2" color="#000084">new</font><font size="2"> ChopboxAnchor(node2)); |
| conn.setTargetDecoration(</font><font size="2" color="#000084">new</font><font size="2"> PolygonDecoration());</font> |
| |
| <font size="2"> Label label = </font><font size="2" color="#000084">new</font><font size="2"> Label(</font><font size="2" color="#008484">"Midpoint"</font><font size="2">); |
| label.setOpaque(</font><font size="2" color="#000084">true</font><font size="2">); |
| label.setBackgroundColor(ColorConstants.buttonLightest); |
| label.setBorder(</font><font size="2" color="#000084">new</font><font size="2"> LineBorder()); |
| conn.add(label, </font><font size="2" color="#000084">new</font><font size="2"> MidpointLocator(conn, 0));</font> |
| |
| panel.add(node1); |
| panel.add(node2); |
| panel.add(conn); |
| <font size="2" color="#000084">new</font><font size="2"> Dragger(node1); |
| </font><font size="2" color="#000084">new</font><font size="2"> Dragger(node2); |
| Display display = Display.getDefault(); |
| </font><font size="2" color="#000084">while</font><font size="2"> (!shell.isDisposed()) { |
| </font><font size="2" color="#000084">if</font><font size="2"> (!display.readAndDispatch()) |
| display.sleep (); |
| } |
| |
| } |
| </font><font size="2" color="#000084">static class</font><font size="2"> Dragger </font><font size="2" color="#000084">extends</font><font size="2"> MouseMotionListener.Stub </font><font size="2" color="#000084">implements</font><font size="2"> MouseListener { |
| </font><font size="2" color="#000084"> public</font><font size="2"> Dragger(IFigure figure){ |
| figure.addMouseMotionListener(</font><font size="2" color="#000084">this</font><font size="2">); |
| figure.addMouseListener(</font><font size="2" color="#000084">this</font><font size="2">); |
| } |
| Point last; |
| </font><font size="2" color="#000084">public void</font><font size="2"> mouseReleased(MouseEvent e){} |
| </font><font size="2" color="#000084">public void</font><font size="2"> mouseClicked(MouseEvent e){} |
| </font><font size="2" color="#000084">public void</font><font size="2"> mouseDoubleClicked(MouseEvent e){} |
| </font><font size="2" color="#000084">public void</font><font size="2"> mousePressed(MouseEvent e){ |
| last = e.getLocation(); |
| } |
| </font><font size="2" color="#000084">public void</font><font size="2"> mouseDragged(MouseEvent e){ |
| Point p = e.getLocation(); |
| Dimension delta = p.getDifference(last); |
| last = p; |
| Figure f = ((Figure)e.getSource()); |
| f.setBounds(f.getBounds().getTranslated(delta.width, delta.height)); |
| } |
| }; |
| |
| }</font></pre> |
| </td> |
| </tr> |
| </table> |
| </div> |
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