[英]How to have mouseEntered execute only if mouse is pressed down in Java
我只想在鼠标当前按下时执行mouseEntered,基本上这样:
@Override
public void mouseEntered(MouseEvent e) {
if(e.mouseDown()){
//Do stuff
}
}
我可以这样做,还是我需要一个鼠标运动监听器或什么?
谢谢!
编辑:抱歉应该让这个更清楚,但我需要按下鼠标才能进入组件之前,就像按住鼠标并将鼠标悬停在组件上一样可以激活监听器
您可能想要评估MouseEvent API以查看可用的方法,因为我认为您将在那里找到您的解决方案:
myComponent.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent mEvt) {
System.out.println("mouse entered");
if (mEvt.getModifiers() == MouseEvent.BUTTON1_MASK) {
System.out.println("Mouse dragging as entered");
}
}
});
例如:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MouseEnteredPressed extends JPanel {
private static final int SIDE = 500;
public MouseEnteredPressed() {
setLayout(new GridBagLayout());
JLabel label = new JLabel("Hovercraft Rules The World!");
label.setFont(label.getFont().deriveFont(Font.BOLD, 24));
label.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));
add(label);
label.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent mEvt) {
System.out.println("mouse entered");
if (mEvt.getModifiers() == MouseEvent.BUTTON1_MASK) {
System.out.println("Mouse dragging as entered");
}
}
});
}
@Override
public Dimension getPreferredSize() {
return new Dimension(SIDE, SIDE);
}
private static void createAndShowGui() {
MouseEnteredPressed mainPanel = new MouseEnteredPressed();
JFrame frame = new JFrame("MouseEnteredPressed");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
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