如何在Java中按下鼠标时执行mouseEntered

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hover在组件上一样可以激活监听器

Answer 1

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(); } }); } }