GWT为我的所有Web应用程序启用esc密钥

Question

I need to add a function when i press esc key in each panel of my web application. Specifically when i press esc key in my web application i need to show a panel which alert if is need to exit from the web application.

my question is : how can do to enable esc key shortcut ?

Answer 1

在GWT中，通常使用NativePreviewHandler实现全局快捷方式。

Answer 2

Here's a snippet from a project I work on, it should give you an idea of what to do:

public class MyDialogBox extends com.google.gwt.user.client.ui.DialogBox 
{
    @Override
    protected void onPreviewNativeEvent(Event.NativePreviewEvent event)
    {
        super.onPreviewNativeEvent(event);
        switch (event.getTypeInt())
        {
            case Event.ONKEYDOWN:
                if (event.getNativeEvent().getKeyCode() == KeyCodes.KEY_ESCAPE) 
                {
                    // do stuff
                }
                break;
        }
    }
}