Question

我有两个屏幕都延伸GameScreen，后者又延伸JPanel。我的NavigationFrame类正常执行，但我的InternalSensorsFrame正在我的按钮上绘制灰色背景矩形，这样按钮就会被隐藏，当你将它们鼠标悬停在它们上面时，它们只会短暂地闪烁。这是我的代码。任何人都可以告诉我为什么一个例子正在工作而另一个例子没有，以及我如何解决它？

public class NavigationFrame extends GameScreen {

...
    public NavigationFrame() {
        //super(parent);
        addKeyListener(new TAdapter());
        //background
        img = new ImageIcon(Home.resources.getClass().getResource(imageName));
        bg = new BufferedImage(
        img.getIconWidth(),
        img.getIconHeight(),
        BufferedImage.TYPE_4BYTE_ABGR);
        Graphics gg = bg.createGraphics();
        img.paintIcon(null, gg, 0,0);
        gg.dispose();
        RenderingHints rh =
                new RenderingHints(RenderingHints.KEY_ANTIALIASING,
               RenderingHints.VALUE_ANTIALIAS_ON);
        rh.put(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);

    gameFont = new Font("Helvetica", Font.BOLD, 14);

    //Set Viewscreen to blockmapview
    if (viewScreen == null){
        setViewScreen(new ScrollShipScreen(this, 0));
    }
    viewScreen.setBounds(150, 50, 500, 500);
    add(viewScreen);

    //Buttons
    btnMainComputer = new JButton("Main Computer");
    btnMainComputer.setBounds(140, 560, 120, 23);
    btnMainComputer.addActionListener(this);
    add(btnMainComputer);

    btnInternalSensors = new JButton("Internal Sensors");
    btnInternalSensors.setBounds(330, 560, 130, 23);
    btnInternalSensors.addActionListener(this);
    add(btnInternalSensors);

    btnNavigation = new JButton("Navigation");
    btnNavigation.setBounds(550, 560, 110, 23);
    btnNavigation.addActionListener(this);
    add(btnNavigation);


    }

    @Override
    public void paintComponent(Graphics g) {
        //background
        g.setColor(Color.decode("#666665"));
        Graphics2D g2d = (Graphics2D) g;
        g2d.fillRect(0, 0, 800, 600);
        g2d.drawImage(bg, 0, 0,img.getIconWidth(), img.getIconHeight(), this);

        //text setup
        g.setColor(Color.white);
        g.setFont(gameFont);


        //Write the strings
        //left bar
        g.drawString(location, 10,60);
....

    }



    //Button Presses
    public void actionPerformed(ActionEvent ae) {   
        JButton o = (JButton) ae.getSource();
....
        else if(o == btnMainComputer){
            Container parent  = getParent();
            parent.remove(Home.getCurrentScreen());
            Home.setCurrentScreen(new MainComputerFrame());
            parent.add(Home.getCurrentScreen());
            //System.out.println("Main Comp");
        }
        else if(o == btnInternalSensors){
            Container parent  = getParent();
            parent.remove(Home.getCurrentScreen());
            Home.setCurrentScreen(new InternalSensorsFrame());
            parent.add(Home.getCurrentScreen());
            //System.out.println("Sensors");

        }
        else if(o == btnNavigation){
            //Does nothing on a navigation Frame
//          remove(Home.getCurrentScreen());
//          Home.setCurrentScreen(new NavigationFrame());
//          Home.frame.add(Home.getCurrentScreen());
        }

        this.requestFocus();
    }

}

这是非工作阶级：

public class InternalSensorsFrame extends GameScreen {
private String imageName = "textures/interface/View Screen Frame Overlay.png";



public InternalSensorsFrame(){
    //super(parent);
    addKeyListener(new TAdapter());

    //background
    img = new ImageIcon(Home.resources.getClass().getResource(imageName));
    bg = new BufferedImage(
    img.getIconWidth(),
    img.getIconHeight(),
    BufferedImage.TYPE_4BYTE_ABGR);
    Graphics gg = bg.createGraphics();
    img.paintIcon(null, gg, 0,0);
    gg.dispose();
    RenderingHints rh =
            new RenderingHints(RenderingHints.KEY_ANTIALIASING,
           RenderingHints.VALUE_ANTIALIAS_ON);
    rh.put(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);

    //Add buttons
    btnMainComputer = new JButton("Main Computer");
    btnMainComputer.setBounds(140, 560, 120, 23);
    btnMainComputer.addActionListener(this);
    add(btnMainComputer);

    btnInternalSensors = new JButton("Internal Sensors");
    btnInternalSensors.setBounds(330, 560, 130, 23);
    btnInternalSensors.addActionListener(this);
    add(btnInternalSensors);

    btnNavigation = new JButton("Navigation");
    btnNavigation.setBounds(550, 560, 110, 23);
    btnNavigation.addActionListener(this);
    add(btnNavigation);

}
@Override
public void paintComponent(Graphics g) {
    //super.paint(g);
    g.setColor(Color.decode("#666665"));
    Graphics2D g2d = (Graphics2D) g;
    g2d.fillRect(0, 0, 800, 600);
    g2d.drawImage(bg, 0, 0,img.getIconWidth(), img.getIconHeight(), this);
    g2d.translate(150, 50);
    Home.ship.shipLayout.paintComponent(g2d);
//        ArrayList<CrewMan> crew = Home.ship.crew;
//        for (int i=0; i<crew.size(); i++){
//          crew.get(i).paint(g2d);
//        }
        g.setColor(Color.white);
        g.drawString("teststring", 10,60);
        //super.paint(g);

        //Toolkit.getDefaultToolkit().sync();
      //  g.dispose();
}

        //Button Presses
        public void actionPerformed(ActionEvent ae) {   

            JButton o = (JButton) ae.getSource();

            if(o == btnMainComputer){
                Container parent  = getParent();
                parent.remove(Home.getCurrentScreen());
                Home.setCurrentScreen(new MainComputerFrame());
                parent.add(Home.getCurrentScreen());
                //System.out.println("Main Comp");
            }
            else if(o == btnInternalSensors){
                Container parent  = getParent();
                parent.remove(Home.getCurrentScreen());
                Home.setCurrentScreen(new InternalSensorsFrame());
                parent.add(Home.getCurrentScreen());
                //System.out.println("Sensors");

            }
            else if(o == btnNavigation){
                Container parent  = getParent();
                parent.remove(Home.getCurrentScreen());
                Home.setCurrentScreen(new NavigationFrame());
                parent.add(Home.getCurrentScreen());
            }

            this.requestFocus();
        }
}

Answer 1

也许这些建议并不能解决您的问题，但可能会有所帮助。

1）

覆盖此方法时调用super.paintComponent(g)。

@Override
    public void paintComponent(Graphics g) {
        //background
        super.paintComponent(g);
        g.setColor(Color.decode("#666665"));
        Graphics2D g2d = (Graphics2D) g;
        g2d.fillRect(0, 0, 800, 600);
        g2d.drawImage(bg, 0, ...

2）requestFocus()

请注意，不鼓励使用此方法，因为它的行为是平台依赖的。相反，我们建议使用 requestFocusInWindow（）。

3）为你的课程使用正确的名称你说你的班级是一个框架，而实际上是一个JPanel。

4）作为个人建议，不要使用过多的具体继承，因为它很危险且难以保留，而且你的继承树级别太高，相反你可以使用这样的东西。

示例：

public class NavigationComponent {

private GameScreen gameScreen;

public NavigationComponent(){
      gameScreen = new GameScreen(){
           @override
          public paintComponent(Graphics g){
              // code here
          }

      };
}

}

5）您正在将keyListener添加到JPanel。要完成这项工作，你必须让你的对象可以聚焦并成为焦点。而不是keyListener，摆动方式是使用KeyBinding。 Swing旨在与keyBindings一起使用。How to use keybindings

Answer 2

我在发布后简要解决了我的问题：添加super.paintComponents(g);不起作用/没有任何区别。最后是因为我正在处理图形。这是工作代码：

    @Override
public void paintComponent(Graphics g) {
   // super.paintComponents(g);
    g.setColor(Color.decode("#666665"));
    Graphics2D g2d = (Graphics2D) g;
    g2d.fillRect(0, 0, 800, 600);
    g2d.drawImage(bg, 0, 0,img.getIconWidth(), img.getIconHeight(), this);



    Toolkit.getDefaultToolkit().sync();
//  g.dispose(); //commenting this line out made it work
    }

但是，我非常感谢这里给出的答案/评论，并将通过它们来增强代码的其余部分/将在评论中作出回应。谢谢！

paintComponent隐藏的JButtons

2 个答案: