hengheng123456789

1、使用Shell的Tool Tips 实现图像内的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实现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实现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();
 }