KeyListener到Listener的穿越（combo底层将text的keyEvent通知combo）-优快云博客

本文链接：https://blog.youkuaiyun.com/tomholmes7/article/details/5716544

本文介绍了一种在SWT框架中实现子控件向父级Composite传递键盘事件的方法。通过在子控件Text上添加KeyListener，并将键盘事件转换为Event对象，再利用Composite的notifyListeners方法，使得父级Composite能够监听到子控件的键盘事件。

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在SWT开发中经常有控件嵌套控件的情况，尤其底层是Composite的时候。如果希望把Composite上的某个控件的Event发送给Composite，进行整个Composite的监听和更新。则需要对KeyEvent进行转换，变成notify可以识别的Event。

1. 父Composite添加KeyListener。

2. 子Control添加KeyListener，同时在其keyPress里进行KeyEvent转Event，和通知父composite监听器。

/** * Tomholmes7 test * @param args */ public static void main(String[] args) { Shell shell = new Shell(); shell.setLayout(new GridLayout()); shell.setSize(500, 375); shell.setText("SWT Application"); final Composite c = new Composite(shell,SWT.NONE); c.setLayout(new FillLayout()); Text t = new Text(c,SWT.BORDER); t.addKeyListener(new KeyListener(){ @Override public void keyPressed(KeyEvent keyevent) { Event origin = new Event(); origin.widget = c; origin.display = c.getDisplay(); origin.time = keyevent.time; origin.count = 1; origin.type = SWT.KeyDown; origin.button = 1; origin.keyCode = keyevent.keyCode; c.notifyListeners(SWT.KeyDown, origin); } @Override public void keyReleased(KeyEvent keyevent) { } }); c.pack(); c.addKeyListener(new KeyListener(){ @Override public void keyPressed(KeyEvent keyevent) { System.out.println("bbb"); } @Override public void keyReleased(KeyEvent keyevent) { // TODO Auto-generated method stub } }); final Display display = Display.getDefault(); shell.open(); shell.layout(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } }