swt 工具栏中添加下拉式的按钮[转]
swt 工具栏中添加下拉式的按钮
package rcp;
import org.eclipse.swt.SWT;
public class ToolItemDropDownMenu {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
ToolBar toolBar = new ToolBar(shell, SWT.BORDER | SWT.VERTICAL);
ToolItem item = new ToolItem(toolBar, SWT.DROP_DOWN);
item.setText("One");
DropdownSelectionListener listenerOne = new DropdownSelectionListener(item);
listenerOne.add("Option One for One");
listenerOne.add("Option Two for One");
listenerOne.add("Option Three for One");
item.addSelectionListener(listenerOne);
toolBar.pack();
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
class DropdownSelectionListener extends SelectionAdapter {
private ToolItem dropdown;
private Menu menu;
public DropdownSelectionListener(ToolItem dropdown) {
this.dropdown = dropdown;
menu = new Menu(dropdown.getParent().getShell());
}
public void add(String item) {
MenuItem menuItem = new MenuItem(menu, SWT.NONE);
menuItem.setText(item);
menuItem.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
MenuItem selected = (MenuItem) event.widget;
dropdown.setText(selected.getText());
}
});
}
public void widgetSelected(SelectionEvent event) {
if (event.detail == SWT.ARROW) {
ToolItem item = (ToolItem) event.widget;
Rectangle rect = item.getBounds();
Point pt = item.getParent().toDisplay(new Point(rect.x, rect.y));
menu.setLocation(pt.x, pt.y + rect.height);
menu.setVisible(true);
} else {
System.out.println(dropdown.getText() + " Pressed");
}
}
}