Working with Dropdowns : ToolItem « SWT « Java Tutorial

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Java Tutorial » SWT » ToolItem 
17. 65. 7. Working with Dropdowns

To provide Combo-like functionality to a dropdown tool item:

Working with Dropdowns
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;

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 = (MenuItemevent.widget;
        dropdown.setText(selected.getText());
      }
    });
  }

  public void widgetSelected(SelectionEvent event) {
    if (event.detail == SWT.ARROW) {
      ToolItem item = (ToolItemevent.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");
    }
  }
}
17. 65. ToolItem
17. 65. 1. Constants for Creating Tool Items
17. 65. 2. Create a push buttonCreate a push button
17. 65. 3. Add check buttons to ToolBarAdd check buttons to ToolBar
17. 65. 4. Add radio buttons to ToolBarAdd radio buttons to ToolBar
17. 65. 5. Two dropdownsTwo dropdowns
17. 65. 6. Creating Radio GroupsCreating Radio Groups
17. 65. 7. Working with DropdownsWorking with Dropdowns
17. 65. 8. Add ToolItem to ToolBarAdd ToolItem to ToolBar
17. 65. 9. Add image to ToolItemAdd image to ToolItem
17. 65. 10. Update a status line when the pointer enters a ToolItemUpdate a status line when the pointer enters a ToolItem
17. 65. 11. Add ToolTip to ToolItemAdd ToolTip to ToolItem
17. 65. 12. Add SelectionListener to ToolItemAdd SelectionListener to ToolItem
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