hengheng123456789

1、使用Shell的Tool Tips 實現圖像內的Tool Tips 。
?public static void main (String [] args) {
??Display display = new Display ();
??final Color [] colors = {
???display.getSystemColor (SWT.COLOR_RED),
???display.getSystemColor (SWT.COLOR_GREEN),
???display.getSystemColor (SWT.COLOR_BLUE),
??};
??final Rectangle [] rects = {
???new Rectangle (10, 10, 30, 30),
???new Rectangle (20, 45, 25, 35),
???new Rectangle (80, 80, 10, 10),
??};
??final Shell shell = new Shell (display);
??Listener mouseListener = new Listener () {
???public void handleEvent (Event event) {
????switch (event.type) {
?????case SWT.MouseEnter:
?????case SWT.MouseMove:
??????for (int i=0; i<rects.length; i++) {
???????if (rects [i].contains (event.x, event.y)) {
????????String text = "ToolTip " + i;
????????if (!(text.equals (shell.getToolTipText ()))) {
?????????shell.setToolTipText ("ToolTip " + i);
????????}
????????return;
???????}
??????}
??????shell.setToolTipText (null);
??????break;
?????}
???}
??};
??shell.addListener (SWT.MouseMove, mouseListener);
??shell.addListener (SWT.MouseEnter, mouseListener);
??shell.addListener (SWT.Paint, new Listener () {
???public void handleEvent (Event event) {
????GC gc = event.gc;
????for (int i=0; i<rects.length; i++) {
?????gc.setBackground (colors [i]);
?????gc.fillRectangle (rects [i]);
?????gc.drawRectangle (rects [i]);
????}
???}
??});
??shell.setSize (200, 200);
??shell.open ();
??while (!shell.isDisposed ()) {
???if (!display.readAndDispatch ()) display.sleep ();
??}
??display.dispose ();
?}

2、使用Shell實現Tool Tip的功能。
?public static void main (String[] args) {
??final Display display = new Display ();
??final Shell shell = new Shell (display);
??shell.setLayout (new FillLayout ());
??final Table table = new Table (shell, SWT.BORDER);
??for (int i = 0; i < 20; i++) {
???TableItem item = new TableItem (table, SWT.NONE);
???item.setText ("item " + i);
??}
??// Disable native tooltip
??table.setToolTipText ("");
??
??// Implement a "fake" tooltip
??final Listener labelListener = new Listener () {
???public void handleEvent (Event event) {
????Label label = (Label)event.widget;
????Shell shell = label.getShell ();
????switch (event.type) {
?????case SWT.MouseDown:
??????Event e = new Event ();
??????e.item = (TableItem) label.getData ("_TABLEITEM");
??????// Assuming table is single select, set the selection as if
??????// the mouse down event went through to the table
??????table.setSelection (new TableItem [] {(TableItem) e.item});
??????table.notifyListeners (SWT.Selection, e);
??????shell.dispose ();
??????table.setFocus();
??????break;
?????case SWT.MouseExit:
??????shell.dispose ();
??????break;
????}
???}
??};
??
??Listener tableListener = new Listener () {
???Shell tip = null;
???Label label = null;
???public void handleEvent (Event event) {
????switch (event.type) {
?????case SWT.Dispose:
?????case SWT.KeyDown:
?????case SWT.MouseMove: {
??????if (tip == null) break;
??????tip.dispose ();
??????tip = null;
??????label = null;
??????break;
?????}
?????case SWT.MouseHover: {
??????TableItem item = table.getItem (new Point (event.x, event.y));
??????if (item != null) {
???????if (tip != null? && !tip.isDisposed ()) tip.dispose ();
???????//使用Shell實現Tool Tip的功能
???????tip = new Shell (shell, SWT.ON_TOP | SWT.NO_FOCUS | SWT.TOOL);
???????tip.setBackground (display.getSystemColor (SWT.COLOR_INFO_BACKGROUND));
???????FillLayout layout = new FillLayout ();
???????layout.marginWidth = 2;
???????tip.setLayout (layout);
???????label = new Label (tip, SWT.NONE);
???????label.setForeground (display.getSystemColor (SWT.COLOR_INFO_FOREGROUND));
???????label.setBackground (display.getSystemColor (SWT.COLOR_INFO_BACKGROUND));
???????label.setData ("_TABLEITEM", item);
???????label.setText (item.getText ());
???????label.addListener (SWT.MouseExit, labelListener);
???????label.addListener (SWT.MouseDown, labelListener);
???????Point size = tip.computeSize (SWT.DEFAULT, SWT.DEFAULT);
???????Rectangle rect = item.getBounds (0);
???????Point pt = table.toDisplay (rect.x, rect.y);
???????tip.setBounds (pt.x, pt.y, size.x, size.y);
???????tip.setVisible (true);
??????}
?????}
????}
???}
??};
??table.addListener (SWT.Dispose, tableListener);
??table.addListener (SWT.KeyDown, tableListener);
??table.addListener (SWT.MouseMove, tableListener);
??table.addListener (SWT.MouseHover, tableListener);
??shell.pack ();
??shell.open();
??while (!shell.isDisposed()) {
???if (!display.readAndDispatch())
????display.sleep();
??}
??display.dispose();
?}