如何在keybinding中将参数传递给abstractaction？

zpqajqem 于 2021-07-03 发布在 Java

关注(0)|答案(1)|浏览(402)

我有以下键绑定：

InputMap iMap = component.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
    ActionMap aMap = component.getActionMap();

    iMap.put(KeyStroke.getKeyStroke("shift LEFT"), "MOVE_LONG_LEFT");
    iMap.put(KeyStroke.getKeyStroke("LEFT"), "MOVE_LEFT");
    aMap.put("MOVE_LONG_LEFT", moveLeft);   // I WANT moveLeft TO RECEIVE 10 AS PARAMETER
    aMap.put("MOVE_LEFT", moveLeft);        // I WANT moveLeft TO RECEIVE 1 AS PARAMETER

我想在actionmap中为moveleft添加一个参数，比如（伪代码）：

aMap.put("MOVE_LONG_LEFT", moveLeft, 10);
aMap.put("MOVE_LEFT", moveLeft, 1);

...

Action moveLeft = new AbstractAction(int steps) {
    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("moved Left " + steps + " steps");
    }
};

可以在keybindings中传递参数吗？

Java swing key-bindings action-mapping

来源：https://stackoverflow.com/questions/65052866/how-do-i-pass-an-arguments-to-an-abstractaction-in-a-keybinding

1条答案

按热度按时间

zu0ti5jz1#

如何将参数传递给抽象操作
创建您的 Action 作为内部类，则可以将参数另存为类的示例变量：

class MoveAction extends AbstractAction 
{
    private int steps;

    public MoveAction(int steps)
    {
        this.steps = steps;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("moved Left " + steps + " steps");
    }
};

然后你使用这个类，比如：

aMap.put("MOVE_LONG_LEFT", new MoveAction(10)); 
aMap.put("MOVE_LEFT", new MoveAction(1));

见；使用键盘移动。这个 MotionWithKeyBindings 示例演示了这种方法。

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如何在keybinding中将参数传递给abstractaction？

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