树的事件展开收缩 多选

原来例子：Snippet61

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public class Snippet61 {public static void main (String [] args) {Display display = new Display ();Shell shell = new Shell (display);shell.setLayout (new FillLayout ());final Tree tree = new Tree (shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL);for (int i=0; i<4; i++) {TreeItem item0 = new TreeItem (tree, 0);item0.setText ("Item " + i);for (int j=0; j<4; j++) {TreeItem item1 = new TreeItem (item0, 0);item1.setText ("SubItem " + i + " " + j);for (int k=0; k<4; k++) {TreeItem item2 = new TreeItem (item1, 0);item2.setText ("SubItem " + i + " " + j + " " + k);}}}tree.addListener (SWT.Selection, new Listener () {public void handleEvent (Event e) {String string = "";TreeItem [] selection = tree.getSelection ();for (int i=0; i<selection.length; i++) string += selection [i] + " ";System.out.println ("Selection={" + string + "}");}});tree.addListener (SWT.DefaultSelection, new Listener () {public void handleEvent (Event e) {String string = "";TreeItem [] selection = tree.getSelection ();for (int i=0; i<selection.length; i++) string += selection [i] + " ";System.out.println ("DefaultSelection={" + string + "}");}});tree.addListener (SWT.Expand, new Listener () {public void handleEvent (Event e) {System.out.println ("Expand={" + e.item + "}");}});tree.addListener (SWT.Collapse, new Listener () {public void handleEvent (Event e) {System.out.println ("Collapse={" + e.item + "}");}});tree.getItems()[0].setExpanded (true);shell.pack ();shell.open ();while (!shell.isDisposed ()) {if (!display.readAndDispatch ()) display.sleep ();}display.dispose ();}} 

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《Eclipse插件笔记》P149，树中的SWT.FULL_SELECTION，也是其效果的，因为现在的书，是可以增加到多列的。从Eclipse3.1开始，TableTree和Tree的功能在Tree中都具有了，也就是说这里的Tree也可以使多列的。

《Eclipse插件笔记》P151，对于Expand和Collapse事件：是在树展开或折起的动作发生之后才发送出去的，因此无法试图通过将事件类TreeEvent的doit属性设置为false来取消这个动作。另外，调用TreeItem.setExpanded方法来展开或折起不会触发这个事件。

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