彈出選單要定義為SWT.POP_UP 帶有下拉按鈕的工具欄按鈕要設定為SWT.DROP_DOWN 判斷是否是單擊下拉按鈕事件的方法程式碼： if(event.detail == SWT.ARROW) 顯示選單時，要先計算出選單所要出現的位置，然後通過setLocation(x,y)方法定位選單，最後使用setVisible(true)方法將選單顯示出來。 package com.layotech.www.toolbar; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Menu; import org.eclipse.swt.widgets.MenuItem; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.ToolBar; import org.eclipse.swt.widgets.ToolItem; import com.layotech.www.facory.ImageFactory; public class ToolBarSample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("ToolBar"); shell.setLayout(new GridLayout()); Composite tool = new Composite(shell, SWT.NONE); tool.setLayoutData(new GridData(SWT.LEFT, SWT.TOP,true,false)); //建立工具欄物件 final ToolBar toolBar = new ToolBar(tool, SWT.FLAT); //建立開啟按鈕 ToolItem openItem = new ToolItem(toolBar, SWT.NONE); openItem.setImage(ImageFactory.loadImage(display, ImageFactory.OPEN_IMAGE)); openItem.setText("開啟"); openItem.setToolTipText("開啟"); final ToolItem helpItem = new ToolItem(toolBar, SWT.DROP_DOWN); helpItem.setImage(ImageFactory.loadImage(display, ImageFactory.PREVIEW_IMAGE)); helpItem.setText("幫助"); helpItem.setToolTipText("幫助"); final Menu helpMenu = new Menu(shell,SWT.POP_UP); MenuItem welcomeItem = new MenuItem(helpMenu, SWT.PUSH); welcomeItem.setText("歡迎"); new MenuItem(helpMenu, SWT.SEPARATOR); MenuItem updateItem = new MenuItem(helpMenu, SWT.PUSH); updateItem.setText("線上更新"); MenuItem aboutItem = new MenuItem(helpMenu, SWT.PUSH); aboutItem.setText("關於我們"); helpItem.addListener(SWT.Selection, new Listener() { @Override public void handleEvent(Event event) { if(event.detail == SWT.ARROW){ //獲得幫助按鈕所在的座標位置和大小 Rectangle rec = helpItem.getBounds(); //計算出選單出現的起始位置 Point point = new Point(rec.x, rec.y+rec.height); //將該店轉化為與螢幕相對的點 point = toolBar.toDisplay(point); //設定選單的位置 helpMenu.setLocation(point.x,point.y); helpMenu.setVisible(true); } } }); toolBar.pack(); Text content = new Text(shell, SWT.MULTI); content.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); shell.setSize(200,150); shell.open(); while(!shell.isDisposed()){ if(!display.readAndDispatch()){ display.sleep(); } } ImageFactory.dispose(); display.dispose(); } }