在面板中,我有10 * 10切换按钮。我的目标是参加此活动: 如果鼠标左键按下并且鼠标悬停在特定按钮上,则调用“单击按钮”行。因此,用户可以轻松选择(单击)多个按钮。
这不起作用(在移动鼠标时更改相同的按钮,而不是更改另一个按钮):
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);
}
});
}
}
试过这个,不起作用(他的实现有什么问题?):
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 );
}
}
});
}
}
答案 0 :(得分:2)
即使将鼠标移到另一个组件上,mouseDragged事件的源也始终是您首次生成mousePressed事件的组件。
如果您想知道鼠标当前位于哪个组件上,则需要做一些额外的工作。
类似的东西:
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 );
}
上面的代码尝试转换鼠标在屏幕上的位置,以查找当前位于其上方的组件。