我有JPanel一個(gè)鼠標(biāo)偵聽器，用于檢查mouseEntered和，這與鼠標(biāo)聚焦到窗格上的按鈕并觸發(fā)事件mouseExited這一事實(shí)完全不同。mouseExited是否有設(shè)置使按鈕不占用鼠標(biāo)焦點(diǎn)？
1 回答
白衣染霜花
TA貢獻(xiàn)1796條經(jīng)驗(yàn) 獲得超10個(gè)贊
在這種情況下，我從來不需要專門修改焦點(diǎn)。我也不熟悉 JPane，所以我認(rèn)為您指的是 JPanel。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FocusDemo {
private JPanel panel;
private JButton button1;
JFrame frame = new JFrame("TempWindow");
private FocusDemo() {
panel = new JPanel();
button1 = new JButton("Button");
button1.addActionListener((ae) -> System.out.println("button pressed"));
panel.add(button1);
MyMouseListener ml = new MyMouseListener();
panel.addMouseListener(ml);
panel.addMouseMotionListener(ml);
frame.add(panel);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new FocusDemo().start());
}
public void start() {
frame.setLocationRelativeTo(null); // this line set the window in the
// center of the screen
frame.setPreferredSize(new Dimension(500, 500));
frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private class MyMouseListener extends MouseAdapter {
public void mouseEntered(MouseEvent me) {
System.out.println("mouse entered");
}
public void mouseExited(MouseEvent me) {
System.out.println("mouse exited");
}
}
}
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