Sets up a custom tooltip when hovering over tree items.
The tooltip will display the element's javadoc, if any, or the item's getText otherwise.
final Tree tree = (Tree) getControl();
/*
* Reference:
* http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet125.java?view=markup
*/
final Listener listener = new Listener() {
Shell tip = null;
Label label = null;
public void handleEvent(Event event) {
switch(event.type) {
case SWT.Dispose:
case SWT.KeyDown:
case SWT.MouseExit:
case SWT.MouseDown:
case SWT.MouseMove:
if (tip != null) {
tip.dispose();
tip = null;
label = null;
}
break;
case SWT.MouseHover:
if (tip != null) {
tip.dispose();
tip = null;
label = null;
}
String tooltip = null;
TreeItem item = tree.getItem(new Point(event.x, event.y));
if (item != null) {
Object data = item.getData();
if (data instanceof PropertySheetEntry) {
tooltip = ((PropertySheetEntry) data).getDescription();
}
if (tooltip == null) {
tooltip = item.getText();
} else {
tooltip = item.getText() + ":\r" + tooltip;
}
}
if (tooltip != null) {
Shell shell = tree.getShell();
Display display = tree.getDisplay();
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(tooltip);
label.addListener(SWT.MouseExit, this);
label.addListener(SWT.MouseDown, this);
Point size = tip.computeSize(SWT.DEFAULT, SWT.DEFAULT);
Rectangle rect = item.getBounds(0);
Point pt = tree.toDisplay(rect.x, rect.y);
tip.setBounds(pt.x, pt.y, size.x, size.y);
tip.setVisible(true);
}
}
}
};
tree.addListener(SWT.Dispose, listener);
tree.addListener(SWT.KeyDown, listener);
tree.addListener(SWT.MouseMove, listener);
tree.addListener(SWT.MouseHover, listener);
