Vaadin:如何以编程方式在 TAB 按钮上执行 KeyPressEvent? [英] Vaadin: How To programmatically perform a KeyPressEvent on TAB-Button?

问题描述

有没有办法以编程方式执行按钮按下事件，即 Vaadin 中的 TAB-Button?我必须为 ShortCutListener 编写一个测试，它监听 ShortCut ShortCutAction.KeyEvent.TAB.

is there a way to programmatically perform a Button Press Event i.e for the TAB-Button in Vaadin? I have to write a test for a ShortCutListener, which listens to ShortCut ShortCutAction.KeyEvent.TAB.

我尝试过类似的事情:

Button button = new Button();

        button.addShortcutListener(new ShortcutListener("ShortCut", ShortcutAction.KeyCode.TAB, null) {

            private static final long serialVersionUID = 1L;

            @Override
            public void handleAction(Object sender, Object target) {
                System.out.println("Click!");

            }
        });

        button.setClickShortcut(ShortcutAction.KeyCode.TAB, null);

        button.click();

推荐答案

如果你想要的是在按下 tab 键时触发 click 事件，你可以执行以下操作:

If what you want is triggering the click event when pressing the tab key, you could do the following:

Button button = new Button();

button.addClickListener(new Button.ClickListener() {
    private static final long serialVersionUID = 1L;

    @Override
    public void buttonClick(final ClickEvent event) {
        System.out.println("Click!");
    }
});

button.setClickShortcut(ShortcutAction.KeyCode.TAB);

button.click();

使用 Vaadin Button 在按键上做一些有用的事情可能不是一个好主意，除非按键是点击按钮的快捷方式(setClickShortcut 方法让你定义).

Using a Vaadin Button to do something useful on a key press is probably not a good idea, except if the keypress is a shortcut to clicking on the button (which the setClickShortcut method lets you define).

如果你想在按键上做一些与你的按钮不同的事情，你应该在你的 Window 或 Panel 上定义一个动作处理程序，如Vaadin 推荐.

If you want to do something specific on a keypress, something that is different from what your buttons do, you should define an action handler on your Window or Panel, as Vaadin recommends.

这篇关于Vaadin:如何以编程方式在 TAB 按钮上执行 KeyPressEvent?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！