当按下 f11 时如何使窗口全屏显示？答案

【问题标题】：when f11 is pressed how can i make the window fullscreen?当按下 f11 时如何使窗口全屏显示？
【发布时间】：2016-03-07 14:51:19
【问题描述】：

import javax.swing.JFrame;

import java.awt.Color;

public class Main extends JFrame{

    public static void main(String[] args) {
        Main window = new Main();
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setSize(200, 200);
        window.setVisible(true);
        window.setTitle("Virtual World");
        window.setResizable(true);
        window.getContentPane().setBackground(Color.BLACK);
    }

}

如何使 F11 使窗口进入和退出全屏模式？

我阅读了其他问题并尝试使用window.setUndecorated(true);，但它似乎没有做任何事情......

【问题讨论】：

标签： java swing jframe window fullscreen

【解决方案1】：

要使JFrame 真正全屏，您必须将其设置为未装饰。但要将其设置为未装饰，您必须先将其处理掉。例如

class FullscreenToggleAction extends AbstractAction {

  private JFrame frame;
  private GraphicsDevice fullscreenDevice;

  public FullscreenToggleAction (JFrame frame) {
    this(frame, GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice());
  }

  public FullscreenToggleAction (JFrame frame, GraphicsDevice fullscreenDevice) {
    this.frame = frame;
    this.fullscreenDevice = fullscreenDevice;
  }

  @Override
  public void actionPerformed(ActionEvent e) {
    frame.dispose();

    if (frame.isUndecorated()) {
      fullscreenDevice.setFullScreenWindow(null);
      frame.setUndecorated(false);
    } else {
      frame.setUndecorated(true);
      fullscreenDevice.setFullScreenWindow(frame);
    }

    frame.setVisible(true);
    frame.repaint();
  }
}

然后只需添加键绑定

public class Main {

  public static final void addKeyBinding(JComponent c, String key, final Action action) {
    c.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(key), key);
    c.getActionMap().put(key, action);
    c.setFocusable(true);
  }

  public static void main(String[] args) {
    final JFrame frame = new JFrame("Fullscreen Toggle Test");

    Container contentPane = frame.getContentPane();
    contentPane.add(new JLabel("Toogle fullscreen using F11"), BorderLayout.CENTER);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(600, 400);
    frame.setVisible(true);

    addKeyBinding(frame.getRootPane(), "F11", new FullscreenToggleAction(frame));
  }
}

您还可以在不同的GraphicsDevices 上使其全屏显示。例如。在多显示器环境中

GraphicsEnvironment localGraphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] screenDevices = localGraphicsEnvironment.getScreenDevices();

addKeyBinding(frame.getRootPane(), "F11", new FullscreenToggleAction(frame, screenDevices[1]));

【讨论】：

【解决方案2】：

我使用以下内容：

public static final void addKeyBinding(JComponent c, String key, final Action action) {
    c.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(key), key);
    c.getActionMap().put(key, action);
    c.setFocusable(true);
}

例子：

public static void main(String[] args) {
    final JFrame frame = new JFrame("Test");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(new JPanel());
    frame.setSize(600, 400);
    frame.setVisible(true);

    addKeyBinding(frame.getRootPane(), "F11", new AbstractAction() {

        @Override
        public void actionPerformed(ActionEvent e) {
            int state = frame.getExtendedState();

            if (state == JFrame.MAXIMIZED_BOTH) {
                state = JFrame.NORMAL;
            } else {
                state = JFrame.MAXIMIZED_BOTH;
            }

            frame.setExtendedState(state);
        }
    });
}

【讨论】：

这可行，但我希望窗口覆盖整个屏幕。例如看电影全屏看不到任务栏