java - 使 JInternal Frame 不可移动

Question

我正在使用拖放组件在java swing中进行练习，我遇到了一个问题，我将其放入JPanel(一个JInternal Frame)中

, 它是可移动的,

i want to make it un-moveable

,使用哪个事件？我该怎么做 ？我在互联网上搜索但不幸的是找不到解决方案。

我在互联网上找到了这个，但我想借助 swing 中的事件选项来完成它。

     // Make first internal frame unmovable

JInternalFrame[] frames = frame.desktop.getAllFrames();
JInternalFrame f = frames[0];
BasicInternalFrameUI ui = (BasicInternalFrameUI)f.getUI();

Component north = ui.getNorthPane();
MouseMotionListener[] actions =        // there is no option for MouseMotionListener in the event option
(MouseMotionListener[])north.getListeners(MouseMotionListener.class);

for (int i = 0; i < actions.length; i++)
north.removeMouseMotionListener( actions[i] );

Answer 1

DesktopManager 负责所有内部框架的操作。所以你可以使用 proxy pattern 重新定义它使某些框架不可移动。这是一个不完整的示例(抱歉，我没有测试过这段代码，所以我不确定它是否有效)。

private static class ProxyDesktopManager implements DesktopManager {

    private final DesktopManager delegate;

    public ProxyDesktopManager(DesktopManager delegate) {
        this.delegate = Objects.requireNonNull(delegate);
    }

    // Check whether frame is moveable
    private boolean checkFrameMovable(JComponent frame) {
        if (frame instanceof JInternalFrame) {
            // TODO check whether the frame if movable

        }
        return false;
    }

    @Override
    public void beginDraggingFrame(JComponent f) {
        if (checkFrameMovable(f)) {
            delegate.beginDraggingFrame(f);
        }
    }

    @Override
    public void dragFrame(JComponent f, int newX, int newY) {
        if (checkFrameMovable(f)) {
            delegate.dragFrame(f, newX, newY);
        }
    }

    @Override
    public void endDraggingFrame(JComponent f) {
        if (checkFrameMovable(f)) {
            delegate.endDraggingFrame(f);
        }
    }

    @Override
    public void openFrame(JInternalFrame f) {
        delegate.openFrame(f);
    }

    @Override
    public void closeFrame(JInternalFrame f) {
        delegate.closeFrame(f);
    }

    @Override
    public void maximizeFrame(JInternalFrame f) {
        delegate.maximizeFrame(f);
    }

    @Override
    public void resizeFrame(JComponent f, int newX, int newY, int newWidth, int newHeight) {
        delegate.resizeFrame(f, newX, newY, newWidth, newHeight);
    }

    // IMPORTANT: simply delegate all another methods like openFrame or 
    // resizeFrame
}

现在您可以为您的 JDesktopPane 使用此代理类

JDesktopPane desktop = new JDesktopPane();
desktop.setDesktopManager(new ProxyDesktopManager(desktop.getDesktopManager()));