在GWT中关闭窗口执行代码

Question

我想做这样的事情：

Window.addWindowClosingHandler(new Window.ClosingHandler() {

    @Override
    public void onWindowClosing(ClosingEvent event) {
        event.setMessage("Really?");

        // If user clicks 'ok' in the dialog, execute code below. Else skip the code and return to window.

        // CODE that does stuff goes here.
    }
});

如何捕获对话框中的输入？

Answer 1

需要有两个处理程序，一个Window.ClosingHandler和一个CloseHandler。见下文。这将确保，如果在对话框中单击“取消”，CloseHandler则不会触发。但是，如果单击“确定”，将CloseHandler执行并将运行必要的代码。这可以用于释放数据库锁，整洁地关闭打开的会话等。

Window.addWindowClosingHandler(new Window.ClosingHandler() {

    @Override
    public void onWindowClosing(ClosingEvent event) {
        event.setMessage("You sure?");
    }
});

Window.addCloseHandler(new CloseHandler<Window>() {

    @Override
    public void onClose(CloseEvent<Window> event) {
        //Execute code when window closes!
    }
});