J2ME兑现的滚动条ScrollBar
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" width="248" height="331" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0"> <param name="src" value="/admin/blogs/586731/e:/scrollbar.png"> <embed type="application/x-shockwave-flash" width="248" height="331" src="/admin/blogs/586731/e:/scrollbar.png"></embed></object> 只需要修改其中的count 变量，就可以调整整个菜单中元素的数量。
只要大家修改一下，就可以封装成一个滚动条ScroolBar的控件，以后使用的话，无非就是往这个屏幕里添加控件而已，很简单。
大家多提宝贵意见啊！
看了要回帖啊@@@@@@@
public class TestCanvas extends Canvas implements Runnable{
private boolean isColorChange = false,isRun = true,isVibrate = false;
private int dragBox_Width = 17,dragBox_Height ;
private int dragBox_X,dragBox_Y;
private int dragLine_Width = 9,dragLine_Height;
public int ScreenWidth,ScreenHeight;
private Thread th = null;
private int onDragColor = 0x40e0d0,defaultDragColor = 0x696969;
private int curKey;
private int vibrateTime = 20;
private int vendor,offset = 0,bufImage_Y;
private Image bufImage = null;
private Graphics bufGraphics = null;
int count = 64;
TestCanvas(){
setFullScreenMode(true);
ScreenWidth = this.getWidth();
ScreenHeight = this.getHeight();
bufImage = Image.createImage(ScreenWidth - dragBox_Width - 5 - (dragBox_Width - dragLine_Width)/2,count*30);
bufGraphics = bufImage.getGraphics();
bufImage_Y = 0;
dragLine_Height = ScreenHeight - 40;
double f = (bufImage.getHeight() /dragLine_Height);
dragBox_Height = (int)(dragLine_Height/f);
dragBox_X = ScreenWidth - dragBox_Width - 5 - (dragBox_Width - dragLine_Width)/2;
dragBox_Y = (ScreenHeight - dragLine_Height)/2;
start();
}
public void paint(Graphics g){
g.setColor(0);
g.fillRect(0, 0, ScreenWidth, ScreenHeight);
g.setColor(0xc0c0c0);
g.fillRoundRect(ScreenWidth - dragBox_Width - 5,
(ScreenHeight - dragLine_Height)/2, dragLine_Width, dragLine_Height, 5, 5);
g.setColor(isColorChange?onDragColor:defaultDragColor);
g.fillRoundRect(dragBox_X, dragBox_Y, dragBox_Width, dragBox_Height, 9, 9);
bufGraphics.setColor(0);
bufGraphics.fillRect(0,0,bufImage.getWidth(), bufImage.getHeight());
bufGraphics.setColor(0xffffff);
for(int i=0;i<count;i++){
bufGraphics.drawString((i+1)+"", 20, i*30, 0);
}
g.drawImage(bufImage, 0, offset, 0);
}
public void run(){
while(isRun){
try{
repaint();
serviceRepaints();
sleep(100L);
}catch(Exception e){
}
}
}
public void start(){
if(th == null){
th = new Thread(this);
}
th.start();
}
public static void sleep(long time){
try{
Thread.sleep(time);
}catch(Exception e){
}
}
public void keyPressed(int key){
curKey = key;
switch(curKey){
case -7:
MidletTest.instance.exitApp();
break;
}
}
public void keyReleased(int key){
curKey = 999;
}
// public void pointerPressed(int x, int y) {
// isColorChange = true;
// if(isVibrate == false){
// MidletTest.instance.vibrate(vibrateTime);
// }
// isVibrate = true;
// vendor = dragBox_Y;
// dragBox_Y = y - dragBox_Height/2;
// dragBox_Y = (dragBox_Y - (ScreenHeight - dragLine_Height) / 2) <= 0 ? (ScreenHeight - dragLine_Height) / 2 - 1
// : dragBox_Y >= ScreenHeight - (ScreenHeight - dragLine_Height)
// / 2 - dragBox_Height ? ScreenHeight
// - (ScreenHeight - dragLine_Height) / 2 - dragBox_Height
// : y - dragBox_Height/2;
// int i = (dragBox_Y - vendor)*(640/200);
// System.out.println("屏幕需要走的:"+i);
// if(i>0){
// offset -= i;
// }else{
// offset += i;
// }
// }
public void pointerReleased(int x, int y) {
isColorChange = false;
isVibrate = false;
}
public void pointerDragged(int x, int y) {
isColorChange = true;
if(isVibrate == false){
// MidletTest.instance.vibrate(vibrateTime);
}
isVibrate = true;
vendor = dragBox_Y;
dragBox_Y = y - dragBox_Height/2;
dragBox_Y = (dragBox_Y - (ScreenHeight - dragLine_Height) / 2) <= 0 ? (ScreenHeight - dragLine_Height) / 2 - 1
: dragBox_Y >= ScreenHeight - (ScreenHeight - dragLine_Height)
/ 2 - dragBox_Height ? ScreenHeight
- (ScreenHeight - dragLine_Height) / 2 - dragBox_Height
: y - dragBox_Height/2;
bufImage.getHeight();
float f1 = (bufImage.getHeight() - ScreenHeight);
float f2 = ScreenHeight - 40 - dragBox_Height;
float f = (f1/f2);
float i = ((dragBox_Y - vendor)*f);
if(y<((ScreenHeight - dragLine_Height)/2+(dragBox_Height/2))){
offset = 0;
}
else
if((y>=((ScreenHeight - dragLine_Height)/2+dragBox_Height/2))&&(y<=(ScreenHeight -(ScreenHeight - dragLine_Height)/2-dragBox_Height/2) )){
offset -= i;
}
else if((y>(ScreenHeight -(ScreenHeight - dragLine_Height)/2-dragBox_Height/2))){
int w = 0;
w = -((count*30)-ScreenHeight);
offset = w;
}
}
}