按下鼠标左键时Java鼠标悬停事件

Question

In a panel I've got 10*10 togglebutton. My goal is to do this event: If left mouse key is down and the mouse is over the specific button call "click on the button" line. So the user can select (click on) multiple buttons easily.

This is not working (changing the same button instead of changing anothers when the mouse is moved):

import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.JToggleButton;

public class ButtonClickOnHover {
    public void clickOnButtonOnHover(JToggleButton button) {
        button.addMouseMotionListener(new MouseMotionListener() {

            @Override
            public void mouseMoved(MouseEvent e) {

            }

            @Override
            public void mouseDragged(MouseEvent e) {
                button.doClick(0);
            }

        });
    }
}

Tried this, not working (what is wrong with his implementation?):

import java.awt.Color;
import java.awt.Component;
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.JPanel;
import javax.swing.JToggleButton;
import javax.swing.SwingUtilities;

public class ButtonClickOnHover {
    public void clickOnButtonOnHover(JPanel panel) {
        panel.addMouseMotionListener(new MouseMotionListener() {



    @Override
    public void mouseMoved(MouseEvent e) {

    }

    @Override
    public void mouseDragged(MouseEvent e) {
        Point location = MouseInfo.getPointerInfo().getLocation();
        JPanel parent = (JPanel) e.getComponent();
        SwingUtilities.convertPointFromScreen(location, parent);
        Component mouseOver = parent.findComponentAt( location );

        if (mouseOver instanceof JToggleButton)
        {
            JToggleButton button = (JToggleButton)mouseOver;
            button.setBackground( Color.YELLOW );
        }
    }

});

}
}

Answer 1

The source of the mouseDragged event will always be the component where you first generated the mousePressed event, even if you move the mouse over another component.

If you want to know what component the mouse is currently over then you will need to do some extra work.

Something like:

Point location = MouseInfo.getPointerInfo().getLocation();
Component button = e.getComponent();
JPanel parent = (JPanel)button.getParent();
SwingUtilities.convertPointFromScreen(location, parent);
Component mouseOver = parent.findComponentAt( location );

if (mouseOver instanceof JToggleButton)
{
    JToggleButton button = (JToggleButton)mouseOver;
    button.setBackground( Color.YELLOW );
}

The above code attempts to convert the mouse location on the screen to find the component it is currently over.