GXT：如何拦截 ctrl-f4

发布于 2024-12-01 04:50:37 字数 736 浏览 4 评论 0原文

我想拦截 Ctrl+F4 以便关闭 TabPanel 的选项卡，而不是关闭我的应用程序正在其中运行的浏览器选项卡。如果我单击以下代码，则以下代码有效首先在选项卡面板内部：

    Viewport v = new Viewport();
    v.setLayout(new FitLayout());

    v.add(panel);
    v.addListener(Events.KeyDown, new Listener<BaseEvent>() {
        public void handleEvent(BaseEvent be) {
            KeyEvent ce = (KeyEvent)be;
            if (ce.isControlKey()) {
                if (ce.getKeyCode() == 115) {
                    System.out.println(ce.getKeyCode() + " Ctrl-f4");
                    ce.preventDefault();
                    ce.stopEvent();
                }
            }
        };
    });

有趣的是，如果焦点位于 TabPanel 之外的某个位置（显然位于视口内部），则不会触发该事件。

有什么想法吗？

原文

I'd like to intercept Ctrl+F4 in order to close tabs of a TabPanel rather then the browser tab my application is running in. The following code is works if I click inside the tab panel first:

    Viewport v = new Viewport();
    v.setLayout(new FitLayout());

    v.add(panel);
    v.addListener(Events.KeyDown, new Listener<BaseEvent>() {
        public void handleEvent(BaseEvent be) {
            KeyEvent ce = (KeyEvent)be;
            if (ce.isControlKey()) {
                if (ce.getKeyCode() == 115) {
                    System.out.println(ce.getKeyCode() + " Ctrl-f4");
                    ce.preventDefault();
                    ce.stopEvent();
                }
            }
        };
    });

The funny thing is that if the focus is somewhre outside the TabPanel (which is obviously located inside the Viewport) the event isn't fired.

Any ideas?

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十年九夏 2024-12-08 04:50:37

ctrl-f4 是 Windows 特定的，因此您不应该依赖它。

相反，要捕获用户关闭窗口/选项卡，请使用 Window.ClosingHandler ：

     Window.addWindowClosingHandler(new Window.ClosingHandler() {
        @Override
        public void onWindowClosing(ClosingEvent closingEvent) {
            closingEvent.setMessage("Closing? Really?")
        }
    });

这将显示一个浏览器对话框，其中包含您的消息和确认按钮。

ctrl-f4 is windows specific, so you should not rely on it.

Instead to catch user closing window/tab use Window.ClosingHandler:

     Window.addWindowClosingHandler(new Window.ClosingHandler() {
        @Override
        public void onWindowClosing(ClosingEvent closingEvent) {
            closingEvent.setMessage("Closing? Really?")
        }
    });

This will show a browser dialog with your message and confirm buttons.

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路还长，别太狂 2024-12-08 04:50:37

您可以使用 ClosingHandler 拦截窗口关闭事件并提示用户确认。但是，您无法完全阻止窗口/选项卡关闭 - 浏览器将不允许这样做。您将必须选择不同的键盘快捷键。

选择快捷方式后，请使用 NativePreviewHandler 来检测它：

Event.addNativePreviewHandler(new NativePreviewHandler() {
  @Override
  public void onPreviewNativeEvent(NativePreviewEvent event) {
    if (event.getTypeInt() == Event.ONKEYDOWN) {
      NativeEvent ne = event.getNativeEvent();

      if (ne.getKeyCode() == 't' && ne.getCtrlKey()) {
        // ...
      }
    }
  }
});

You can use a ClosingHandler to intercept the window close event and prompt the user for confirmation. You cannot, however, completely block the window/tab from closing - the browser will not allow it. You're going to have to choose a different keyboard shortcut.

Once you choose your shortcut use a NativePreviewHandler to detect it:

Event.addNativePreviewHandler(new NativePreviewHandler() {
  @Override
  public void onPreviewNativeEvent(NativePreviewEvent event) {
    if (event.getTypeInt() == Event.ONKEYDOWN) {
      NativeEvent ne = event.getNativeEvent();

      if (ne.getKeyCode() == 't' && ne.getCtrlKey()) {
        // ...
      }
    }
  }
});

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