设置应用程序范围的关键监听器 [英] Setting up application wide Key Listeners

问题描述

如何设置应用程序范围的键侦听器（键盘快捷键），以便在键组合时（例如 Ctrl + Shift + T 按下，在Java应用程序中调用某个动作。

How do i setup application wide key listeners (keyboard shortcuts), so that when a key combination (e.g. Ctrl + Shift + T) is pressed, a certain action is invoked in a Java application.

我知道键盘快捷键可以设置 JMenuBar 菜单项，但在我的情况下，应用程序没有菜单栏。

I know keyboard shortcuts can be set JMenuBar menu items, but in my case the application does not have a menu bar.

推荐答案

查看如何使用密钥绑定的Java教程。

您需要使用组件的 ActionMap 创建并注册 Action 并注册a （ KeyStroke ，动作名称）对应用程序的某个组件的 InputMap 。鉴于你没有 JMenuBar ，你只需在你的顶级 JPanel 中注册密钥绑定即可。应用。

You need to create and register an Action with your component's ActionMap and the register a (KeyStroke, Action Name) pair in one of your application's component's InputMaps. Given that you don't have a JMenuBar you could simply register the key bindings with a top-level JPanel in your application.

例如：

Action action = new AbstractAction("Do It") { ... };

// This is the component we will register the keyboard shortcut with.
JPanel pnl = new JPanel();

// Create KeyStroke that will be used to invoke the action.
KeyStroke keyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_T, InputEvent.CTRL_DOWN_MASK | InputEvent.SHIFT_DOWN_MASK);

// Register Action in component's ActionMap.
pnl.getActionMap().put("Do It", action);

// Now register KeyStroke used to fire the action.  I am registering this with the
// InputMap used when the component's parent window has focus.
pnl.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(keyStroke, "Do It");

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