Java：JSplitPane在Timer处于活动状态时将顶部面板的内容复制到底部面板 [英] Java: JSplitPane duplicates top panel's contents to bottom panel when Timer is active

问题描述

所以我有一个JSplitPane和两个JPanels - 一个在顶部，一个在底部。在这两个面板中，我重写了paintComponent方法并添加了我自己的图形。在底部面板中，我想添加一个动画。当面板不重画时，没问题，但只要Timer（javax.swing.Timer）开始调用重绘，底部面板就会模仿顶部面板的外观并出现毛刺。实际的动画不刷新，而是不断添加（如拖动的画笔而不是移动的对象）。

以下是Bottom Panel类的代码：

  import java.awt.Color; 
 import java.awt.Graphics; 
 import java.awt.event.ActionEvent; 
 import java.awt.event.ActionListener; 
 import java.awt.event.KeyEvent; 
 import javax.swing.JPanel; 
 import javax.swing.Timer; 
 
 public class WaitControls extends JPanel {
 
 private int pos; 
 
 public WaitControls（）{
 setBackground（Color.gray）; 
 pos = 0; 
 
 $ b $ public void progress（）{
 //动画定时器：
定时器定时器=新定时器（30，new ActionListener（）{
 @覆盖
 public void actionPerformed（ActionEvent e）{
 pos ++; 
 repaint（）; 
} 
}）; 
 timer.start（）; 
} 
 
 @Override 
 public void paintComponent（Graphics g）{
 g.fillRect（pos，pos，10，20）; 
 
 
 $ / code $ / pre 
 
 
以下是Splitpane类的代码： p> 
 
 
  //我的类（导入的包）
导入rcc.controls.ControlPanel; 
导入rcc.controls.InitControls; 
导入rcc.controls.WaitControls; 
导入rcc.video.Screen; 
 
 import javax.swing.JSplitPane; 
 
 public class MainPanel扩展JSplitPane {
 
 public RCC rcc; 
公共屏幕; 
 
 private int height; 
 
 public ControlPanel curPanel; 
 
 public MainPanel（RCC rcc，Screen screen，int height）{
 super（JSplitPane.VERTICAL_SPLIT）; 
 
 this.rcc = rcc; 
 this.screen = screen; 
 this.height = height; 
 
 setDividerSize（2）; 
 setEnabled（false）; 
 
 setTopComponent（screen）; 
 
 setToInitControls（）; 
 
 
 //将控制面板设置为init控件*** WORKS FINE *** 
 public void setToInitControls（）{
 InitControls initCtrls = new InitControls（这个）; 
 setBottomComponent（initCtrls）; 
 curPanel = initCtrls; 
 setDividerLocation（height / 4 * 3）; 
} 
 
 //将控制面板设置为等待控件（尝试连接）*** GLITCHES *** 
 public void setToWaitControls（）{
 WaitControls waitCtrls =新的WaitControls（）; 
 setBottomComponent（waitCtrls）; 
 curPanel = waitCtrls; 
 setDividerLocation（height / 4 * 3）; 
 waitCtrls.progress（）; 
} 
} 
  
顶部面板有点复杂。它涉及鼠标操作（包括MouseEntered侦听器）和动画以与用户鼠标输入交互。 
奇怪的是，我有另一个底部的面板被换出来了，这个面板也使用了动画和计时器，并没有这个故障。
 
 
 
任何想法可能会造成这种情况？感谢您的帮助！
解决方案
我无法想象您的动画是如何工作的，
 
 
 1 /但如果动画取决于 Listener 中的任何一个，则 Timer 必须（> Timer＃restart（）;  
 
 
  2 / check（example）， addNotify（） /  removeNotify（）用于开始/停止动画（s） 
 
 
注意需要全高清监视器以获得更好的输出或更改代码行 
 
 
  for（int iPanels = 0; iPanels< 3; iPanels ++） {
  
到
  for（int iPanels = 0; iPanels< 2; iPanels ++）{
  
 ：
  import java.awt。*; 
 import java.awt.event。*; 
 import java.util。*; 
 import javax.swing。*; 
导入javax.swing.SwingUtilities; 
 import javax.swing.Timer; 
 
 public class AnimationBackground {
 
 public AnimationBackground（）{
 Random random = new Random（）; 
 JFrame frame = new JFrame（Animation Background）; 
 frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 frame.setResizable（false）; 
 frame.setLayout（new GridLayout（0，3，10，10））; 
 for（int iPanels = 0; iPanels< 3; iPanels ++）{
 final MyJPanel panel = new MyJPanel（）; 
 panel.setBackground（Color.BLACK）; 
 for（int i = 0; i <50; i ++）{
 Star star = new Star（new Point（random.nextInt（490），random.nextInt（490）））; 
 star.setColor（new Color（100 + random.nextInt（155），100 + random.nextInt（155），100 + random.nextInt（155）））; 
 star.setxIncr（-3 + random.nextInt（7））; 
 star.setyIncr（-3 + random.nextInt（7））; 
 panel.add（star）; 
} 
 panel.setLayout（new GridLayout（10，1））; 
 JLabel label = new JLabel（This is a Starry background。，JLabel.CENTER）; 
 label.setForeground（Color.WHITE）; 
 panel.add（label）; 
 JPanel stopPanel = new JPanel（）; 
 stopPanel.setOpaque（false）; 
 stopPanel.add（new JButton（new AbstractAction（Stop this madness !!）{
 
 private static final long serialVersionUID = 1L; 
 
 @Override 
 public void actionPerformed（ActionEvent e）{
 panel.stopAnimation（）; 
} 
}））; 
 panel.add（stopPanel）; 
 JPanel startPanel = new JPanel（）; 
 startPanel.setOpaque（false）; 
 startPanel.add（new JButton（new AbstractAction（Start moving ...）{
 
 private static final long serialVersionUID = 1L; 
 
 @Override 
 public void actionPerformed（ActionEvent e）{
 panel.startAnimation（）; 
} 
}））; 
 panel.add（startPanel）; 
 frame.add（panel）; 
} 
 frame.pack（）; 
 frame.setLocationRelativeTo（null）; 
 frame.setVisible（true）; 
 
 
 public static void main（String [] args）{
 SwingUtilities.invokeLater（new Runnable（）{
 $ b $ @Override 
 public void run（）{
 AnimationBackground animationBackground = new AnimationBackground（）; 
} 
}）; 
} 
 
 class Star延伸多边形{
 
 private static final long serialVersionUID = 1L; 
私人点位置=空; 
私有颜色= Color.YELLOW; 
 private int xIncr，yIncr; 
 static final int WIDTH = 500，HEIGHT = 500; 
 
星（点位置）{
 int x = location.x; 
 int y = location.y; 
 this.location = location; 
 this.addPoint（x，y + 8）; 
 this.addPoint（x + 8，y + 8）; 
 this.addPoint（x + 11，y）; 
 this.addPoint（x + 14，y + 8）; 
 this.addPoint（x + 22，y + 8）; 
 this.addPoint（x + 17，y + 12）; 
 this.addPoint（x + 21，y + 20）; 
 this.addPoint（x + 11，y + 14）; 
 this.addPoint（x + 3，y + 20）; 
 this.addPoint（x + 6，y + 12）; 
} 
 
 public void setColor（Color color）{
 this.color = color; 
} 
 
 public void move（）{
 if（location.x< 0 || location.x> WIDTH）{
 xIncr = -xIncr; 
} 
 if（location.y< 0 || location.y> WIDTH）{
 yIncr = -yIncr; 
} 
 translate（xIncr，yIncr）; 
 location.setLocation（location.x + xIncr，location.y + yIncr）; 
} 
 
 public void setxIncr（int xIncr）{
 this.xIncr = xIncr; 
} 
 
 public void setyIncr（int yIncr）{
 this.yIncr = yIncr; 
} 
 
 public Color getColor（）{
 return color; 
} 
} 
 
 class MyJPanel继承JPanel {
 
 private static final long serialVersionUID = 1L; 
 private ArrayList< Star> stars = new ArrayList< Star>（）; 
 private timer timer = new Timer（20，new ActionListener（）{
 $ b $ @Override 
 public void actionPerformed（ActionEvent e）{
 for（Star star：stars ）{
 star.move（）; 
} 
 repaint（）; 
} 
}）; 
 
 public void stopAnimation（）{
 if（timer.isRunning（））{
 timer.stop（）; 
 
 
 
 public void startAnimation（）{
 if（！timer.isRunning（））{
 timer.start（）; 
} 
} 
 
 @Override 
 public void addNotify（）{
 super.addNotify（）; 
 timer.start（）; 
} 
 
 @Override 
 public void removeNotify（）{
 super.removeNotify（）; 
 timer.stop（）; 
} 
 
 MyJPanel（）{
 this.setPreferredSize（new Dimension（520，520））; 
} 
 
 public void add（Star star）{
 stars.add（star）; 
} 
 
 @Override 
 public void paintComponent（Graphics g）{
 super.paintComponent（g）; 
（（Graphics2D）g）.setRenderingHint（RenderingHints.KEY_ANTIALIASING，RenderingHints.VALUE_ANTIALIAS_ON）; （星星：星星）
 {
 g.setColor（star.getColor（））; 
 g.fillPolygon（star）; 
} 
} 
} 
} 
  
 
So I have a JSplitPane, and two JPanels - one on top, one on the bottom. In both panels I overrode the paintComponent method and added my own graphics. In the bottom panel, I wanted to add an animation. When the panel does not repaint, it's fine, but as soon as the Timer (javax.swing.Timer) starts to call repaints, the bottom panel mimics the appearance of the top panel and glitches out. The actual animations are not refreshed, but rather it keeps on adding (like a dragged paintbrush instead of a moving object).


Here's the code for the Bottom Panel class:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.JPanel;
import javax.swing.Timer;

public class WaitControls extends JPanel {

    private int pos;

    public WaitControls(){
        setBackground(Color.gray);
        pos = 0;
    }

    public void progress(){
        //animation timer:
        Timer timer = new Timer(30, new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e) {
                pos++;
                repaint();
            }
        });
        timer.start();
    }

    @Override
    public void paintComponent(Graphics g){
        g.fillRect(pos, pos, 10, 20);
    }
}
And here's the code for the Splitpane class:
//my classes (imported packages)
import rcc.controls.ControlPanel;
import rcc.controls.InitControls;
import rcc.controls.WaitControls;
import rcc.video.Screen;

import javax.swing.JSplitPane;

public class MainPanel extends JSplitPane{

    public RCC rcc;
    public Screen screen;

    private int height;

    public ControlPanel curPanel;

    public MainPanel(RCC rcc, Screen screen, int height){
        super(JSplitPane.VERTICAL_SPLIT);

        this.rcc = rcc;
        this.screen = screen;
        this.height = height;

        setDividerSize(2);
        setEnabled(false);

        setTopComponent(screen);

        setToInitControls();
    }

    //sets the control panel to init controls ***WORKS FINE***
    public void setToInitControls(){
        InitControls initCtrls = new InitControls(this);
        setBottomComponent(initCtrls);
        curPanel = initCtrls;
        setDividerLocation(height / 4 * 3);
    }

    //sets the control panel to wait controls (trying to connect) ***GLITCHES***
    public void setToWaitControls(){
        WaitControls waitCtrls = new WaitControls();
        setBottomComponent(waitCtrls);
        curPanel = waitCtrls;
        setDividerLocation(height / 4 * 3);
        waitCtrls.progress();
    }
}
The top panel is a bit complicated. It involves mouse action (including a MouseEntered listener) and animates to interact with user mouse input.
The strange thing is, I have another bottom panel that was swapped out that also uses animations, and a timer, and does not have this glitch.

Any ideas what may have caused this? Thank you for all your help!
解决方案
I can't imagine how your animations works, 

1/ but if animation(s) depends of by any of Listener then Timer must be Timer#restart();

2/ check (example), how to pass addNotify()/removeNotify() for start/stop animatiom(s) 

NOTE required fullHD monitor for better output or change code line
for (int iPanels = 0; iPanels < 3; iPanels++) {
to
for (int iPanels = 0; iPanels < 2; iPanels++) {
Example:   
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.SwingUtilities;
import javax.swing.Timer;

public class AnimationBackground {

    public AnimationBackground() {
        Random random = new Random();
        JFrame frame = new JFrame("Animation Background");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(false);
        frame.setLayout(new GridLayout(0, 3, 10, 10));
        for (int iPanels = 0; iPanels < 3; iPanels++) {
            final MyJPanel panel = new MyJPanel();
            panel.setBackground(Color.BLACK);
            for (int i = 0; i < 50; i++) {
                Star star = new Star(new Point(random.nextInt(490), random.nextInt(490)));
                star.setColor(new Color(100 + random.nextInt(155), 100 + random.nextInt(155), 100 + random.nextInt(155)));
                star.setxIncr(-3 + random.nextInt(7));
                star.setyIncr(-3 + random.nextInt(7));
                panel.add(star);
            }
            panel.setLayout(new GridLayout(10, 1));
            JLabel label = new JLabel("This is a Starry background.", JLabel.CENTER);
            label.setForeground(Color.WHITE);
            panel.add(label);
            JPanel stopPanel = new JPanel();
            stopPanel.setOpaque(false);
            stopPanel.add(new JButton(new AbstractAction("Stop this madness!!") {

                private static final long serialVersionUID = 1L;

                @Override
                public void actionPerformed(ActionEvent e) {
                    panel.stopAnimation();
                }
            }));
            panel.add(stopPanel);
            JPanel startPanel = new JPanel();
            startPanel.setOpaque(false);
            startPanel.add(new JButton(new AbstractAction("Start moving...") {

                private static final long serialVersionUID = 1L;

                @Override
                public void actionPerformed(ActionEvent e) {
                    panel.startAnimation();
                }
            }));
            panel.add(startPanel);
            frame.add(panel);
        }
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

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

            @Override
            public void run() {
                AnimationBackground animationBackground = new AnimationBackground();
            }
        });
    }

    class Star extends Polygon {

        private static final long serialVersionUID = 1L;
        private Point location = null;
        private Color color = Color.YELLOW;
        private int xIncr, yIncr;
        static final int WIDTH = 500, HEIGHT = 500;

        Star(Point location) {
            int x = location.x;
            int y = location.y;
            this.location = location;
            this.addPoint(x, y + 8);
            this.addPoint(x + 8, y + 8);
            this.addPoint(x + 11, y);
            this.addPoint(x + 14, y + 8);
            this.addPoint(x + 22, y + 8);
            this.addPoint(x + 17, y + 12);
            this.addPoint(x + 21, y + 20);
            this.addPoint(x + 11, y + 14);
            this.addPoint(x + 3, y + 20);
            this.addPoint(x + 6, y + 12);
        }

        public void setColor(Color color) {
            this.color = color;
        }

        public void move() {
            if (location.x < 0 || location.x > WIDTH) {
                xIncr = -xIncr;
            }
            if (location.y < 0 || location.y > WIDTH) {
                yIncr = -yIncr;
            }
            translate(xIncr, yIncr);
            location.setLocation(location.x + xIncr, location.y + yIncr);
        }

        public void setxIncr(int xIncr) {
            this.xIncr = xIncr;
        }

        public void setyIncr(int yIncr) {
            this.yIncr = yIncr;
        }

        public Color getColor() {
            return color;
        }
    }

    class MyJPanel extends JPanel {

        private static final long serialVersionUID = 1L;
        private ArrayList<Star> stars = new ArrayList<Star>();
        private Timer timer = new Timer(20, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                for (Star star : stars) {
                    star.move();
                }
                repaint();
            }
        });

        public void stopAnimation() {
            if (timer.isRunning()) {
                timer.stop();
            }
        }

        public void startAnimation() {
            if (!timer.isRunning()) {
                timer.start();
            }
        }

        @Override
        public void addNotify() {
            super.addNotify();
            timer.start();
        }

        @Override
        public void removeNotify() {
            super.removeNotify();
            timer.stop();
        }

        MyJPanel() {
            this.setPreferredSize(new Dimension(520, 520));
        }

        public void add(Star star) {
            stars.add(star);
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            for (Star star : stars) {
                g.setColor(star.getColor());
                g.fillPolygon(star);
            }
        }
    }
}


                        
这篇关于Java：JSplitPane在Timer处于活动状态时将顶部面板的内容复制到底部面板的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！