将无边框的摆动窗口带到前面

Question

我有一个摆动程序,它创建一个全屏无边框窗口 - 我在Windows 7上运行.我需要程序能够聚焦并将自己带到前面.但是,当我尝试使用此处找到的方法时,如何将窗口移到前面？,而不是将窗口移到前面,窗口只是在任务栏中闪烁,不接受输入.下面我写了一个小程序来演示这个问题:

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.Timer;


public class WindowTest extends JFrame{

WindowTest(){
    setTitle("Window Test");
    setSize(600, 600);
    setLocationRelativeTo(null);
    setUndecorated(true);
    setExtendedState(JFrame.MAXIMIZED_BOTH);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
}

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            final WindowTest wt = new WindowTest();
            wt.setVisible(true);

            Timer t = new Timer(3000,new ActionListener(){
                @Override
                public void actionPerformed(ActionEvent arg0) {
                    java.awt.EventQueue.invokeLater(new Runnable() {
                        @Override
                        public void run() {
                            wt.toFront();
                            wt.repaint();
                        }
                    });             
                }   
            });

            t.setRepeats(false);
            t.start();

            wt.addKeyListener(new KeyListener(){
                @Override
                public void keyPressed(KeyEvent arg0) {
                    if(arg0.getKeyCode() == KeyEvent.VK_ESCAPE){
                        wt.dispose();
                        System.exit(0);
                        return;
                    }
                }

                @Override
                public void keyReleased(KeyEvent arg0) {
                    // TODO Auto-generated method stub

                }

                @Override
                public void keyTyped(KeyEvent arg0) {
                    // TODO Auto-generated method stub

                }   
            });
        }
    });

}

 }

这将创建一个无边框,最大化的窗口,然后三秒后将尝试将其带到前面.如果在此之前更改为另一个窗口,任务栏按钮将闪烁,但窗口不会显示在前面.

Answer 1

• toFront(quite common issue)不起作用JFrame,这是基本属性JDialog

• 基本上可以toFront()只移动一个JFrame,必须使用setExtendedState,但副作用闪烁和跳跃scren,使用JDialog相反

• 不要使用KeyListener,因为JFrame不可调焦KeyEvent,必须使用KeyBindings

例如

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.Timer;

public class WindowTest extends JFrame {

    private static final long serialVersionUID = 1L;
    private JFrame frame = new JFrame();

    public WindowTest() {
        frame.setTitle("Window Test");
        frame.setSize(600, 600);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.setExtendedState(JFrame.ICONIFIED);
        Timer t = new Timer(3000, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent arg0) {
                java.awt.EventQueue.invokeLater(new Runnable() {

                    @Override
                    public void run() {
                        frame.setExtendedState(JFrame.NORMAL);
                    }
                });
            }
        });
        t.setRepeats(false);
        t.start();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                final WindowTest wt = new WindowTest();
            }
        });
    }
}