BlackBerry Slider

由于BB项目需要，特定制了Sliderbar，BB上没有这个组件，所以只能自己动手。 请看代码 ： Java代码 package

 package cc.mdev.seek;   
  
import net.rim.device.api.math.Fixed32;   
import net.rim.device.api.system.EncodedImage;   
import net.rim.device.api.ui.Field;   
import net.rim.device.api.ui.Graphics;   
import net.rim.device.api.ui.TouchEvent;   
import net.rim.device.api.ui.TouchGesture;   
import net.rim.device.api.ui.component.BitmapField;   
import net.rim.device.api.ui.component.GaugeField;   
import net.rim.device.api.ui.container.HorizontalFieldManager;   
  
/**  
 * Seekbar 可以拖动  
 *   
 * @author Wang XinFeng  
 * @site http://mdev.cc  
 *   
 */  
public class SeekBar2 extends Field {   
    /**  
     * 水平滑動  
     */  
    public static int HORIZONTAL_SLIDE = 0;   
  
    /**  
     * 垂直滑動  
     */  
    public static int VERTICAL_SLIDE = 1;   
  
    /**  
     * 背景图片  
     */  
    private EncodedImage background;   
  
    /**  
     * 整个Field的高宽度  
     */  
    private int width;   
    /**  
     * 整个Field的高度  
     */  
    private int height;   
  
    /**  
     * 可以拖动的Image  
     */  
    private EncodedImage barImage = null;   
  
    /**  
     * x,y的坐标点  
     */  
    private int x = 0, y = 0;   
  
    /**  
     * 拖动时候的监听器  
     */  
    private OnSlideListener listener = null;   
  
    /**  
     * 刻度的最大值  
     */  
    private int maxValue;   
  
    /**  
     * Seekbar  
     *   
     * @param width  
     *            宽度  
     * @param maxValue 刻度最大值  
     * @param barImage  
     *            可拖动的图片  
     * @param background  
     *            背景  
     * @param listener  
     *            监听器  
     */  
    public SeekBar2(int width,int maxValue,EncodedImage barImage, EncodedImage background,   
            OnSlideListener listener) {   
        this(width, maxValue,barImage, background);   
        this.listener = listener;   
    }   
  
    /**  
     *   
     * @param width  
     *            宽度  
     *    @param maxValue 刻度最大值  
     * @param barImage  
     *            可拖动的图片  
     * @param slideStlye  
     *            滑动方式 垂直或者水平  
     * @param background  
     *            背景  
     */  
    public SeekBar2(int width,int maxValue, EncodedImage barImage, EncodedImage background) {   
        super(FOCUSABLE);   
        this.width = width;   
        this.height = barImage.getHeight();   
        this.background = background.scaleImage32(Fixed32.div(background   
                .getWidth(), width + barImage.getWidth()), Fixed32.div(   
                background.getHeight(), height));   
        this.barImage = barImage;   
        this.maxValue = maxValue;   
    }   
       
    public int getCurrentValue(){   
        return(this.x)/(width/maxValue);   
    }   
       
    /**  
     * 设置滑动监听器  
     *   
     * @param listener  
     */  
    public void setOnSlideListener(OnSlideListener listener) {   
        this.listener = listener;   
    }   
  
    protected void layout(int width, int height) {   
        setExtent(this.background.getWidth(), this.height);   
    }   
  
    protected void paint(Graphics graphics) {   
  
        graphics.drawImage(x, 0, width, height, barImage, 0, 0, 0);   
    }   
  
    protected void paintBackground(Graphics arg0) {   
        arg0.drawImage(getPaddingLeft(), getPaddingTop(), this.background   
                .getWidth(), height, background, 0, 0, 0);   
    }   
  
    protected boolean touchEvent(TouchEvent message) {   
        int e = message.getEvent();   
        // 聚焦时候点击处理   
        if (e == TouchEvent.CLICK && isFocus()) {   
            this.x = message.getX(1);   
            if (listener != null) {   
                listener.onStart();   
            }   
            if (this.x > this.width) {   
                this.x = width;   
            }   
  
            if (this.x < 0) {   
                this.x = 0;   
            }   
            System.out.println("SeekBar2.touchEvent()Click x is :" + this.x);   
            System.out.println("SeekBar2.touchEvent()getCurrentValue is :" + getCurrentValue());   
            this.invalidate();   
            return true;   
        }   
        // 聚焦时候弹起处理   
        if (e == TouchEvent.UP && isFocus()) {   
            if (listener != null) {   
                listener.onEnd();   
            }   
            return true;   
        }   
  
        // 聚焦时候移动处理   
        if (e == TouchEvent.MOVE && isFocus()) {   
            int x2 = message.getX(1);   
            this.x=x2;   
            if (this.x > this.width) {   
                this.x = width;   
            }   
            if (this.x < 0) {   
                this.x = 0;   
            }   
            System.out.println("SeekBar2.touchEvent()MOVE x is :" + this.x);   
            System.out.println("SeekBar2.touchEvent()getCurrentValue is :" + getCurrentValue());   
            this.invalidate();   
            if (listener != null) {   
                listener.onSlide();   
            }   
            return true;   
        }   
        return false;   
    }   
  
    public static int RGB2HEX(int r, int g, int b) {   
        return r << 16 | g << 8 << b;   
    }   
  
    // 禁用此方法，不讓系統畫出焦點   
    protected void drawFocus(Graphics graphics, boolean on) {   
  
    }   
  
    /**  
     * 滑动监听器  
     *   
     * @author Wang XinFeng  
     *   
     */  
    public static interface OnSlideListener {   
  
        /**  
         * 开始滑动  
         */  
        public void onStart();   
  
        /**  
         * 滑动中  
         */  
        public void onSlide();   
  
        /**  
         * 滑动结束  
         */  
        public void onEnd();   
    }   
}