gwt - 在 GWT 中单击 ESCAPE(ESC) 时关闭对话框

Question

如何将诸如 addCloseHandler 之类的内容添加到单击 ESC 键时要关闭的对话框中？

Answer 1

您可以覆盖 onPreviewNativeEvent() DialogBox的方法类(class):

public void onModuleLoad() {
    ExtendedDialogBox dialog = new ExtendedDialogBox();

    dialog.add(new Label("some content"));

    dialog.show();
}

private class ExtendedDialogBox extends DialogBox {

    @Override
    protected void onPreviewNativeEvent(NativePreviewEvent event) {
        super.onPreviewNativeEvent(event);
        switch (event.getTypeInt()) {
            case Event.ONKEYDOWN:
                if (event.getNativeEvent().getKeyCode() == KeyCodes.KEY_ESCAPE) {
                    hide();
                }
                break;
        }
    }
}