Question

我希望能够（在JPanel中 - 我使用KeyBindings进行箭头键和ALT + KeyEvent.VK_lots_of_different_keys）按ALT（并且只有ALT）并知道何时按下它以便我可以拖动鼠标周围并阻止它执行按下alt时不应发生的其他事情。

是否有针对此的KeyEvent或解决方法？（我尝试了各种（4）ALT键面罩，但那些显然不起作用）。

一些代码：

altPressed = false;

InputMap inMap = getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
ActionMap actMap = getActionMap();

KeyStroke pressed = KeyStroke.getKeyStroke(KeyEvent.VK_ALT, 0, false);
KeyStroke released = KeyStroke.getKeyStroke(KeyEvent.VK_ALT, 0, true);

inMap.put(pressed, "alt" + "pressed");
inMap.put(released, "alt" + "released");

actMap.put("alt" + "pressed", new AbstractAction () {
    private static final long serialVersionUID = 1L;

    @Override
    public void actionPerformed(ActionEvent e) {
        altPressed = true;
    }
});

actMap.put("alt" + "released", new AbstractAction () {
    private static final long serialVersionUID = 1L;

    @Override
    public void actionPerformed(ActionEvent e) {
        altPressed = false;
    }
});

private class KeyListener implements ActionListener {//... yada yada yada ...
    @Override
        public void actionPerformed(ActionEvent e) {// check if keys are pressed and perform proper actions....
...
...
}

Timer timer = new Timer(100, new KeyListener());
timer.start();

Answer 1

如果您在单击/拖动/等时尝试检测是否按下了Alt按钮。使用鼠标，您可以使用MouseEvent MouseEvent方法。 MouseInputListener对象将在{{1}}强制执行的每个方法中发送给您的侦听器。

Java KeyEvent只是ALT

1 个答案: