如何跟踪由子控件制作的SWT复合鼠标？

Question

我创建了自己的控件:

我想跟踪鼠标并添加了一个MouseTrackListener.不幸的是MouseEnter和MouseLeave事件也被产生,当在我复合材料部件的鼠标移动(即标签和按钮).

[Mouse enter] - mouse enters the empty space
[Mouse hover] - mouse is over the empty space
[Mouse exit]  - mouse moved over label
[Mouse enter] - mouse leaves label and enters empty space
[Mouse hover] - mouse over empty space
[Mouse exit]  - mouse leaves composite

如何将复合材料作为一个完整的东西而不是子零件进行跟踪？

public class MyComposite extends Composite {
    public MyComposite(final Composite parent, final int style) {
        super(parent, style);

        final Label lbl = new Label(this, SWT.NONE);
        lbl.setBounds(10, 10, 78, 15);
        lbl.setText("My Composite");

        final Button btn = new Button(this, SWT.NONE);
        btn.setBounds(190, 29, 75, 25);
        btn.setText("Ok");

        pack();
    }

    public static void main(final String[] args) {
        final Shell shell = new Shell(Display.getDefault());
        shell.setText("Testcase");
        shell.setLayout(new FillLayout());

        final MyComposite comp = new MyComposite(shell, SWT.NONE);
        comp.addMouseTrackListener(new MouseTrackListener() {
            @Override
            public void mouseHover(final MouseEvent e) {
                System.out.println("[Mouse hover]");
            }

            @Override
            public void mouseExit(final MouseEvent e) {
                System.out.println("[Mouse exit]");
            }

            @Override
            public void mouseEnter(final MouseEvent e) {
                System.out.println("[Mouse enter]");
            }
        });

        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
    }
}

Answer 1

如果您只想获得鼠标移动事件,可以添加无类型事件Composite.应该是这样的

final Composite comp = new Composite(shell, org.eclipse.swt.SWT.NONE);
comp.addListener(SWT.MouseMove, new Listener() {
    public void handleEvent(Event event) {
        System.out.println("hit");
    }
});

如果向所有子项添加相同的Listener实例,MyComposite则可以捕获所有鼠标移动事件.

或者,您可以使用Display.addFilter捕获所有鼠标事件并过滤您Composite实例或其任何子项上发生的事件.

第三种选择是用于Composite.setCapture在鼠标进入Composite区域时获取所有鼠标事件,并在鼠标离开时停止捕获.

其中我认为第一种选择可能是最好的选择.