import javax.microedition.lcdui.*;

public class NewEvent implements Runnable{

        KeyEventCanvas c=null;

        /*
         * 用來(lái)判定是否有鍵被按下
         */
        PRotected boolean switchPoint;

        /*
         * 這個(gè)數(shù)組用來(lái)存儲(chǔ)所有同時(shí)被按鍵的鍵碼
         */
        protected byte[] keyCode;

        /*
         * 訪問(wèn)數(shù)組的索引
         */
        byte index;


        public NewEvent(KeyEventCanvas c){
                this.c=c;
                keyCode=new byte[2];
        }

        /*
         * 這個(gè)方法把被按鍵的鍵碼存儲(chǔ)到數(shù)組中
         */
        public synchronized void startAction(int keyCode){
                this.keyCode[index]=(byte)keyCode;
                index=(byte)((index+1)%this.keyCode.length);
        }

        /*
         * 當(dāng)某個(gè)鍵被釋放時(shí)，這個(gè)方法把該鍵存儲(chǔ)在數(shù)組中的鍵碼置為0
         */
        public synchronized void stopAction(int keyCode){
                for(int i=0;i<=this.keyCode.length-1;i++){
                        if(this.keyCode[i]==(byte)keyCode){
                                this.keyCode[i]=0;
                                break;
                        }
                }
        }
        
        /*
         * 這個(gè)方法用來(lái)判定是否有被按下的鍵，返回true表示有鍵按下，返回false表示沒(méi)有鍵被按下
         */
        public synchronized boolean getSwitchPoint(){
                this.switchPoint=false;
                for(int i=0;i<=this.keyCode.length-1;i++){
                        if(this.keyCode[i]!=0){
                                this.switchPoint=true;
                                break;
                        }
                }
                return this.switchPoint;
        }

        /*
         * 返回字節(jié)數(shù)組
         */
        public synchronized byte[] getKeyCode(){
                return this.keyCode;
        }
        
        public void run(){
                byte[] tmp=this.getKeyCode();
                while(true){
                        while(this.getSwitchPoint()){
                                /*
                                 * 通過(guò)這個(gè)循環(huán)遍歷數(shù)組，碰到被按下的鍵就進(jìn)行處理
                                 */
                                for(int i=0;i<=tmp.length-1;i++){

                                        if(tmp[i]!=0){
                                                switch(c.getGameAction(tmp[i])){
                                                
                                                case Canvas.UP:
                                                        c.y--;//y是在Canvas中定義的一個(gè)屬性，表示y軸坐標(biāo)
                                                        break;
                                                case Canvas.DOWN:
                                                        c.y++;
                                                        break;
                                                case Canvas.LEFT:
                                                        c.x--;//x是在Canvas中定義的一個(gè)屬性，表示x軸坐標(biāo)
                                                        break;
                                                case Canvas.RIGHT:
                                                        c.x++;
                                                        break;
                                                }
                                        }
                                }
                                c.repaint();
                                try{
                                        Thread.sleep(10);
                                }catch(InterruptedException e){
                                        
                                }
                        }
                }
        }
}