public class DragSurfaceView extends SurfaceView implements View.OnTouchListener {
protected int screenWidth;
protected int screenHeight;
protected int lastX;
protected int lastY;
private int oriLeft;
private int oriRight;
private int oriTop;
private int oriBottom;
private int dragDirection;
private static final int TOP = 0x15;
private static final int LEFT = 0x16;
private static final int BOTTOM = 0x17;
private static final int RIGHT = 0x18;
private static final int LEFT_TOP = 0x11;
private static final int RIGHT_TOP = 0x12;
private static final int LEFT_BOTTOM = 0x13;
private static final int RIGHT_BOTTOM = 0x14;
private static final int CENTER = 0x19;
private int offset = 20;
/**
* 初始化获取屏幕宽高
*/
protected void initScreenW_H() {
screenHeight = getResources().getDisplayMetrics().heightPixels - 40;
screenWidth = getResources().getDisplayMetrics().widthPixels;
Log.i("DragViewTAG", "DragSurfaceView.initScreenW_H: screenWidth="+screenWidth+", screenHeight="+screenHeight);
}
public DragSurfaceView(Context context) {
super(context);
setOnTouchListener(this);
initScreenW_H();
}
public DragSurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
setOnTouchListener(this);
initScreenW_H();
}
public DragSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setOnTouchListener(this);
initScreenW_H();
}
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {
oriLeft = v.getLeft();
oriRight = v.getRight();
oriTop = v.getTop();
oriBottom = v.getBottom();
lastY = (int) event.getRawY();
lastX = (int) event.getRawX();
dragDirection = getDirection(v, (int) event.getX(),
(int) event.getY());
}
// 处理拖动事件
delDrag(v, event, action);
if(action==MotionEvent.ACTION_UP){
dragDirection=0;
}
invalidate();
return true;
}
/**
* 获取触摸点flag
*
* @param v
* @param x
* @param y
* @return
*/
protected int getDirection(View v, int x, int y) {
int left = v.getLeft();
int right = v.getRight();
int bottom = v.getBottom();
int top = v.getTop();
if (x < 40 && y < 40) {
return LEFT_TOP;
}
if (y < 40 && right - left - x < 40) {
return RIGHT_TOP;
}
if (x < 40 && bottom - top - y < 40) {
return LEFT_BOTTOM;
}
if (right - left - x < 40 && bottom - top - y < 40) {
return RIGHT_BOTTOM;
}
if (x < 40) {
return LEFT;
}
if (y < 40) {
return TOP;
}
if (right - left - x < 40) {
return RIGHT;
}
if (bottom - top - y < 40) {
return BOTTOM;
}
return CENTER;
}
/**
* 处理拖动事件
*
* @param v
* @param event
* @param action
*/
protected void delDrag(View v, MotionEvent event, int action) {
switch (action) {
case MotionEvent.ACTION_MOVE:
int dx = (int) event.getRawX() - lastX;
int dy = (int) event.getRawY() - lastY;
switch (dragDirection) {
case LEFT: // 左边缘
left(v, dx);
break;
case RIGHT: // 右边缘
right(v, dx);
break;
case BOTTOM: // 下边缘
bottom(v, dy);
break;
case TOP: // 上边缘
top(v, dy);
break;
case CENTER: // 点击中心-->>移动
center(v, dx, dy);
break;
case LEFT_BOTTOM: // 左下
left(v, dx);
bottom(v, dy);
break;
case LEFT_TOP: // 左上
left(v, dx);
top(v, dy);
break;
case RIGHT_BOTTOM: // 右下
right(v, dx);
bottom(v, dy);
break;
case RIGHT_TOP: // 右上
right(v, dx);
top(v, dy);
break;
default:
break;
}
v.layout(oriLeft, oriTop, oriRight, oriBottom);
// if (dragDirection != CENTER) {
// v.layout(oriLeft, oriTop, oriRight, oriBottom);
// }
lastX = (int) event.getRawX();
lastY = (int) event.getRawY();
Log.i("DragViewTAG", "DragSurfaceView.delDrag:ACTION_MOVE direction="+dragDirection+", left="+oriLeft+", top="+oriTop+", right="+oriRight+", bottom="+oriBottom);
break;
case MotionEvent.ACTION_UP:
ViewGroup.LayoutParams newLayoutParams = getNewLayoutParams();
if(newLayoutParams!=null){
Log.i("DragViewTAG", "DragSurfaceView.delDrag:ACTION_UP width="+newLayoutParams.width+", height="+newLayoutParams.height);
setLayoutParams(newLayoutParams);
}else {
Log.e("DragViewTAG", "DragSurfaceView.delDrag: 父组件类型？");
v.layout(oriLeft, oriTop, oriRight, oriBottom);
}
break;
default:
break;
}
}
private ViewGroup.LayoutParams getNewLayoutParams(){
if(getLayoutParams() instanceof RelativeLayout.LayoutParams){
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams)getLayoutParams( );
lp.leftMargin = oriLeft;
lp.topMargin = oriTop;
lp.width = oriRight-oriLeft;
lp.height = oriBottom-oriTop;
return lp;
}else if(getLayoutParams() instanceof FrameLayout.LayoutParams) {
FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) getLayoutParams();
lp.leftMargin = oriLeft;
lp.topMargin = oriTop;
lp.width = oriRight - oriLeft;
lp.height = oriBottom - oriTop;
return lp;
}
return null;
}
/**
* 触摸点为中心->>移动
*
* @param v
* @param dx
* @param dy
*/
private void center(View v, int dx, int dy) {
oriLeft += dx;
oriTop += dy;
oriRight += dx;
oriBottom += dy;
Log.i("DragViewTAG", "DragSurfaceView.center: v.left="+v.getLeft()+", v.top="+v.getTop());
if (oriLeft < -offset) {
Log.e("DragViewTAG", "DragSurfaceView.center: 左侧越界, left="+oriLeft+", offset="+offset);
oriLeft = -offset;
oriRight = oriLeft + v.getWidth();
}
if (oriRight > screenWidth + offset) {
Log.e("DragViewTAG", "DragSurfaceView.center: 右侧越界, right="+oriRight+", screenWidth="+screenWidth+", offset="+offset);
oriRight = screenWidth + offset;
oriLeft = oriRight - v.getWidth();
}
if (oriTop < -offset) {
Log.e("DragViewTAG", "DragSurfaceView.center: 顶部越界, top="+oriTop+", offset="+offset);
oriTop = -offset;
oriBottom = oriTop + v.getHeight();
}
if (oriBottom > screenHeight + offset) {
Log.e("DragViewTAG", "DragSurfaceView.center: 底部越界, bottom="+oriBottom+", screenHeight="+screenHeight+", offset="+offset);
oriBottom = screenHeight + offset;
oriTop = oriBottom - v.getHeight();
}
// v.layout(left, top, right, bottom);
}
/**
* 触摸点为上边缘
*
* @param v
* @param dy
*/
private void top(View v, int dy) {
oriTop += dy;
if (oriTop < -offset) {
oriTop = -offset;
}
if (oriBottom - oriTop - 2 * offset < 200) {
oriTop = oriBottom - 2 * offset - 200;
}
}
/**
* 触摸点为下边缘
*
* @param v
* @param dy
*/
private void bottom(View v, int dy) {
oriBottom += dy;
if (oriBottom > screenHeight + offset) {
oriBottom = screenHeight + offset;
}
if (oriBottom - oriTop - 2 * offset < 200) {
oriBottom = 200 + oriTop + 2 * offset;
}
}
/**
* 触摸点为右边缘
*
* @param v
* @param dx
*/
private void right(View v, int dx) {
oriRight += dx;
if (oriRight > screenWidth + offset) {
oriRight = screenWidth + offset;
}
if (oriRight - oriLeft - 2 * offset < 200) {
oriRight = oriLeft + 2 * offset + 200;
}
}
/**
* 触摸点为左边缘
*
* @param v
* @param dx
*/
private void left(View v, int dx) {
oriLeft += dx;
if (oriLeft < -offset) {
oriLeft = -offset;
}
if (oriRight - oriLeft - 2 * offset < 200) {
oriLeft = oriRight - 2 * offset - 200;
}
}
/**
* 获取截取宽度
*
* @return
*/
public int getCutWidth() {
return getWidth() - 2 * offset;
}
/**
* 获取截取高度
*
* @return
*/
public int getCutHeight() {
return getHeight() - 2 * offset;
}
}
