自定义轮子监听器阻止ScrollPane Wheel Listener

Question

我在我的JPanel中添加了一个自定义mousewheellistener，因为我将为这个使用ctrl + mousewheel的面板实现缩放功能。我的JPanel也在JScrollpane中。我的问题是;当我将MouseWheelListener添加到面板时，即使未按下Ctrl键，鼠标滚轮也不适用于滚动窗格。我要那个;当按下ctrl时，鼠标滚轮可以进行缩放，如果没有按下，它应该适用于滚动窗格。我怎么能这样做？

public class ZoomTest {

    public static void main(String[] args) {
        JPanel jZoomPanel = new JPanel();
        jZoomPanel.setPreferredSize(new Dimension(300, 500));
        jZoomPanel.addMouseWheelListener(new MouseWheelListener() {

            @Override
            public void mouseWheelMoved(MouseWheelEvent e) {
                if(e.isControlDown()) {
                // TODO implement zoom
                }
            }
        });

        JScrollPane jsc = new JScrollPane(jZoomPanel);

        JFrame jDemoFrame = new JFrame();
        jDemoFrame.getContentPane().add(jsc);
        jDemoFrame.setSize(300, 300);

        jDemoFrame.setVisible(true);
    }

}

Answer 1

您应该像这样派遣您的活动：

jZoomPanel.addMouseWheelListener(new MouseWheelListener() {

    @Override
    public void mouseWheelMoved(MouseWheelEvent e) {
        if(e.isControlDown()) {
        // TODO implement zoom
        } else {
            JPanel panel = (JPanel) me.getSource();
            MouseEvent newMe = SwingUtilities.convertMouseEvent(panel, me, jsc);
            jsc.dispatchEvent(me);
        }
    }
});