Java Thread Programming 1.9.2 – Threads and Swing

Using a Worker Thread to Relieve the Event Thread使用背景工作執行緒來做事務操作/* * Created on 2005-7-17 * * Java Thread Programming - Paul Hyde  * Copyright ? 1999 Sams Publishing * Jonathan Q. Bo 學習筆記 *  */package org.tju.msnrl.jonathan.thread.chapter9; import java.awt.*;import java.awt.event.*;import javax.swing.*; /** * @author Jonathan Q. Bo from TJU MSNRL * * Email:jonathan.q.bo@gmail.com * Blog:blog.csdn.net/jonathan_q_bo *      blog.yesky.net/jonathanundersun *  * Enjoy Life with Sun! *  */ public class BalanceLookUp extends JPanel{    private JTextField accTF;    private JTextField pinTF;    private JButton searchB;    private JButton cancelB;    private JLabel balanceL;        private volatile Thread lookupThread;        public BalanceLookUp(){        buildGUI();//控制顯示        hookupEvent();//添加事件處理    }        /** 添加控制項 */    public void buildGUI(){        JLabel accountL = new JLabel("Account Label");        JLabel pinL = new JLabel("Pin");        accTF = new JTextField(12);        pinTF = new JTextField(4);                JPanel dataP = new JPanel();        dataP.setLayout(new FlowLayout(FlowLayout.CENTER));        dataP.add(accountL);        dataP.add(accTF);        dataP.add(pinL);        dataP.add(pinTF);                searchB = new JButton("search");        cancelB = new JButton("cancel");        cancelB.setEnabled(false);                JPanel buttonP = new JPanel();        buttonP.setLayout(new GridLayout(1,-1,5,5));        buttonP.add(searchB);        buttonP.add(cancelB);                JPanel outButtonP = new JPanel();        outButtonP.setLayout(new FlowLayout(FlowLayout.CENTER));        outButtonP.add(buttonP);                JLabel balancePrifLb = new JLabel("account balance");        this.balanceL = new JLabel("unknown balance");                JPanel balanceP = new JPanel();        balanceP.setLayout(new FlowLayout(FlowLayout.CENTER));        balanceP.add(balancePrifLb);        balanceP.add(balanceL);                JPanel northP = new JPanel();        northP.setLayout(new GridLayout(-1,1,5,5));        northP.add(dataP);        northP.add(outButtonP);        northP.add(balanceP);                setLayout(new BorderLayout());        add(northP);    }        /** 添加事件響應函數 */    public void hookupEvent(){        searchB.addActionListener(                new ActionListener(){                    public void actionPerformed(ActionEvent e){                        search();                    }                }        );                cancelB.addActionListener(                new ActionListener(){                    public void actionPerformed(ActionEvent e){                        cancelSearch();                    }                }        );    }        /** 處理尋找操作 */    private void search(){        this.ensureEventThread();        searchB.setEnabled(false);        cancelB.setEnabled(true);        balanceL.setText("searching ... ");                String account = accTF.getText();        String pin = pinTF.getText();                /*建立一個線程處理，根據帳戶和密碼察看帳戶餘額*/        lookupAsyn(account,pin);    }        /**處理取消操作*/    private void cancelSearch(){        this.ensureEventThread();                cancelB.setEnabled(false);        searchB.setEnabled(true);                if(lookupThread != null){            lookupThread.interrupt();        }    }        /**建立線程處理察看操作*/    private void lookupAsyn(String acc,String pin){        final String accN = acc;        final String pinN = pin;                Runnable runA = new Runnable(){            public void run(){                String bal = lookupBalance(accN,pinN);                setBalanceSaftly(bal);            }        };                lookupThread = new Thread(runA);        lookupThread.start();    }        /** 安全的顯示balance */    private void setBalanceSaftly(String bal){        final String balN = bal;                Runnable runA = new Runnable(){            public void run(){                try{                    setBalance(balN);                }catch(Exception e){                    e.printStackTrace();                }            }        };                /*放到訊息佇列，等待處理，返回*/        SwingUtilities.invokeLater(runA);    }        /** 顯示balance */    private void setBalance(String bal){        this.ensureEventThread();                balanceL.setText(bal);        cancelB.setEnabled(false);        searchB.setEnabled(true);    }        /** 其實這兩個參數沒有用的啦 */        private String lookupBalance(String acc,String pin){        try{            Thread.sleep(5000);            return "1,234.5";        }catch(InterruptedException e){            return "search canceled";        }    }        /** 保證在訊息線程中執行 */    private void ensureEventThread(){        if(SwingUtilities.isEventDispatchThread() == false)            throw new RuntimeException("only event thread can do this");        return;    }     public static void main(String[] args) {        BalanceLookUp blp = new BalanceLookUp();                JFrame f = new JFrame("Balance Lookup");        f.addWindowListener(                new WindowAdapter(){                    public void windowClosing(WindowEvent e){                        System.exit(0);                    }                }        );        f.setContentPane(blp);        f.setSize(400,150);        f.setVisible(true);    }}  Scrolling Text in a Custom Component動畫效果：滾動字幕/* * Created on 2005-7-18 * * Java Thread Programming - Paul Hyde  * Copyright ? 1999 Sams Publishing * Jonathan Q. Bo 學習筆記 *  */package org.tju.msnrl.jonathan.thread.chapter9; import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.awt.font.*;import java.awt.image.*;/* * Provides the Java 2D classes  * for defining and performing operations  * on objects  * related to two-dimensional geometry.  *//*提供二維幾何操作*/import java.awt.geom.*; /** * @author Jonathan Q. Bo from TJU MSNRL * * Email:jonathan.q.bo@gmail.com * Blog:blog.csdn.net/jonathan_q_bo *      blog.yesky.net/jonathanundersun *  * Enjoy Life with Sun! *  */public class ScrollText extends JComponent {        private BufferedImage image;    private Dimension imageSize;    public volatile int currOffset;        private Thread localThread;    private volatile boolean noStopRequest;        public ScrollText(String text){        currOffset = 0;        buildImage(text);                this.setMaximumSize(this.imageSize);        this.setMinimumSize(this.imageSize);        this.setPreferredSize(this.imageSize);        this.setSize(this.imageSize);                this.noStopRequest = true;                Runnable runA = new Runnable(){          public void run(){              try{                  runWork();              }catch(Exception e){                  e.printStackTrace();              }          }        };                localThread = new Thread(runA,"ScrollText");        localThread.start();    }        public void paint(Graphics g){        g.setClip(0,0,this.imageSize.width,imageSize.height);        int localOffset = currOffset;        g.drawImage(this.image,-localOffset,0,this);        g.drawImage(this.image,imageSize.width - localOffset,0,this);        g.setColor(Color.BLACK);        g.drawRect(0,0,imageSize.width - 1,imageSize.height - 1);    }        public void stopThread(){        this.noStopRequest = false;        localThread.interrupt();    }        public boolean isAlive(){        return localThread.isAlive();    }        private void buildImage(String text){        RenderingHints renderHints = new RenderingHints(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);        renderHints.put(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);                BufferedImage scratchImage = new BufferedImage(1,1,BufferedImage.TYPE_INT_RGB);        Graphics2D scratchG2 = scratchImage.createGraphics();        scratchG2.setRenderingHints(renderHints);                Font font = new Font("Serif",Font.BOLD | Font.ITALIC,24);        FontRenderContext frc = scratchG2.getFontRenderContext();                TextLayout tl = new TextLayout(text,font,frc);        Rectangle2D textBounds = tl.getBounds();        int textWidth = (int)Math.ceil(textBounds.getWidth());        int textHeight = (int)Math.ceil(textBounds.getHeight());                int horizPad = 10;        int verticPad = 6;                this.imageSize = new Dimension(textWidth + horizPad,textHeight + verticPad);        this.image = new BufferedImage(imageSize.width,imageSize.height,BufferedImage.TYPE_INT_RGB);                Graphics2D g2 = image.createGraphics();        g2.setRenderingHints(renderHints);                int baselineOffset = (verticPad / 2) - (int)(textBounds.getY());        g2.setColor(Color.WHITE);        g2.fillRect(0,0,imageSize.width,imageSize.height);        g2.setColor(Color.BLUE);        tl.draw(g2,0,baselineOffset);                scratchG2.dispose();        scratchImage.flush();        g2.dispose();    }        private void runWork(){        while(noStopRequest){            try{                Thread.sleep(100);                                currOffset = (currOffset + 1)%this.imageSize.width;                                repaint();            }catch(InterruptedException e){                Thread.currentThread().interrupt();                System.out.println("interruptedException " + e.getMessage());            }        }    }     public static void main(String[] args) {        ScrollText st = new ScrollText("Java can do animation");                JPanel p = new JPanel(new FlowLayout());        p.add(st);                JFrame f = new JFrame("Scroll Text Demo");        f.setContentPane(p);        f.setSize(400,200);        f.setVisible(true);    }}  Animating a Set of Images動畫效果：一個橢圓的動態縮放/* * Created on 2005-7-19 * * Java Thread Programming - Paul Hyde  * Copyright ? 1999 Sams Publishing * Jonathan Q. Bo 學習筆記 *  */package org.tju.msnrl.jonathan.thread.chapter9; import java.awt.*;import java.awt.image.*;import javax.swing.*; /** * @author Jonathan Q. Bo from TJU MSNRL * * Email:jonathan.q.bo@gmail.com * Blog:blog.csdn.net/jonathan_q_bo *      blog.yesky.net/jonathanundersun *  * Enjoy Life with Sun! *  */public class SlideShow extends JComponent {    private BufferedImage[] slide;//輪顯的圖形    private Dimension slideSize;//切片大小    private volatile int currSlide;//當前要顯示的切片        private Thread internalThread;//新線程執行更新    private volatile boolean noStopRequested;//標識線程停止        public SlideShow(){        currSlide = 0;                /*設定控制項大小*/        slideSize = new Dimension(50,50);                /*在緩衝中作圖*/        buildSlides();                /*設定為固定大小*/        setMinimumSize(slideSize);        setPreferredSize(slideSize);        setMaximumSize(slideSize);        setSize(slideSize);                noStopRequested = true;        Runnable r = new Runnable(){            public void run(){                try{                    runWork();                }catch(Exception e){                    e.printStackTrace();                }            }        };                /*自運行object*/        internalThread = new Thread(r,"SlidwShow");        internalThread.start();    }        public void paint(Graphics g){        /*繪製當前slide*/        g.drawImage(slide[currSlide],0,0,this);    }        private void buildSlides(){        RenderingHints renderHints = new RenderingHints(                RenderingHints.KEY_ANTIALIASING,                RenderingHints.VALUE_ANTIALIAS_ON);                renderHints.put(                RenderingHints.KEY_RENDERING,                RenderingHints.VALUE_RENDER_QUALITY);                slide = new BufferedImage[20];                Color rectColor = new Color(100,160,250);        Color circleColor = new Color(250,250,150);         /*畫出每一個slide*/        for(int i = 0; i < slide.length; i++){            slide[i] = new BufferedImage(                    slideSize.width,                    slideSize.height,                    BufferedImage.TYPE_INT_RGB);                        /*獲得Graphics控制*/            Graphics2D g2 = slide[i].createGraphics();                        /*設定renderhint*/            g2.setRenderingHints(renderHints);                        /*填充矩形*/            g2.setColor(rectColor);            g2.fillRect(0,0,slideSize.width,slideSize.height);                        /*畫橢圓,5到45之間*/            g2.setColor(circleColor);            int diameter = 0;            if(i < (slide.length/2)){                diameter = 5 + (8*i);            }else{                diameter = 5 + (8*(slide.length - i));            }            int inset = (slideSize.width - diameter)/2;            g2.fillOval(inset,inset,diameter,diameter);                        /*畫矩形外框*/            g2.setColor(Color.BLACK);            g2.drawRect(0,0,slideSize.width - 1, slideSize.height - 1);                        /*釋放資源*/            g2.dispose();        }    }        private void runWork(){        while(noStopRequested){            try{                Thread.sleep(100);                /*輪換圖片*/                currSlide = (currSlide + 1)%slide.length;                /*更新顯示*/                repaint();            }catch(InterruptedException e){                Thread.currentThread().interrupt();                e.printStackTrace();            }        }    }        public void stopRequest(){        noStopRequested = false;        internalThread.interrupt();    }        public static void main(String[] args){        SlideShow ss = new SlideShow();                JPanel p = new JPanel(new FlowLayout());        p.add(ss);                JFrame f = new JFrame("SlideShow Demo");        f.setContentPane(p);        f.setSize(250,150);        f.setVisible(true);    }}  Displaying Elapsed Time on a JLabel  動畫效果：在一個JLabel中顯示逝去的時間/* * Created on 2005-7-19 * * Java Thread Programming - Paul Hyde  * Copyright ? 1999 Sams Publishing * Jonathan Q. Bo 學習筆記 *  */package org.tju.msnrl.jonathan.thread.chapter9; import javax.swing.*;import java.awt.*;import java.text.*;import java.lang.reflect.*; /** * @author Jonathan Q. Bo from TJU MSNRL * * Email:jonathan.q.bo@gmail.com * Blog:blog.csdn.net/jonathan_q_bo *      blog.yesky.net/jonathanundersun *  * Enjoy Life with Sun! *  */public class DigitalTimer extends JLabel {    private volatile String timeText;        private Thread internalThread;    private volatile boolean noStopRequested;        public DigitalTimer(){        this.setBorder(BorderFactory.createLineBorder(Color.BLACK));        this.setHorizontalAlignment(SwingConstants.RIGHT);        this.setFont(new Font("SansSerif",Font.BOLD,16));                /*用來確定控制項大小*/        this.setText("00000.0");        this.setMinimumSize(getPreferredSize());        this.setPreferredSize(this.getPreferredSize());        this.setSize(this.getPreferredSize());                timeText = "0.0";        this.setText(timeText);                noStopRequested = true;        Runnable r = new Runnable(){          public void run(){              try{                  runWork();              }catch(Exception e){                  e.printStackTrace();              }          }        };                /*自運行object*/        internalThread = new Thread(r,"DigitalTimer");        internalThread.start();    }        private void runWork(){        long startTime = System.currentTimeMillis();//開始時間        int tenths = 0;//線程執行的次數        long normalSleepTime = 100;//正常時間間隔        long nextSleepTime = 100;//下一次時間間隔        DecimalFormat fmt = new DecimalFormat("0.0");                /*更新label顯示*/        Runnable updateText = new Runnable(){                public void run(){                    setText(timeText);                }        };                while(noStopRequested){            try{                /*對即時性要求高*/                Thread.sleep(nextSleepTime);                                /*while執行次數加*/                tenths++;                long currTime = System.currentTimeMillis();//目前時間                long elapsedTime = currTime - startTime;//實際已經過去的時間                                /*下一次線程休息時間在應該間隔時間上調整，實際逝去時間和應該逝去時間的查值*/                nextSleepTime = normalSleepTime + ((tenths * 100) - elapsedTime);                /*如果為負，則設為0*/                if(nextSleepTime < 0)                    nextSleepTime = 0;                                /*通知顯示*/                timeText = fmt.format(elapsedTime/1000.0);                SwingUtilities.invokeAndWait(updateText);            }catch(InterruptedException e1){                e1.printStackTrace();                /*停止運行*/                return;            }catch(InvocationTargetException e2){                e2.printStackTrace();            }        }            }        public static void main(String[] args){        DigitalTimer dt = new DigitalTimer();                JPanel p = new JPanel(new FlowLayout());        p.add(dt);                JFrame f = new JFrame("DigitalTimer Demo");        f.setContentPane(p);        f.setSize(250,100);        f.setVisible(true);    }    }