#ScaleGestureDetector
缩放事件，1
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7public boolean onTouchEvent(MotionEvent event) {
boolean scaleEvent = mScaleGestureDetector.onTouchEvent(event);//缩放事件
boolean gestureEvent = mGestureDetector.onTouchEvent(event);//处理一般事件
//如果没有焦点的状态应该交给父类,缩放背景。
//二维码被选中时缩放就缩放二维码 背景不改变。
return !isFocusState()?false:scaleEvent || gestureEvent;
}
对于手势监听，只有当onTouch 返回为True的情况下，才会执行，（也就是说event.getPonterCount()返回才会大于1）
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21 @Override
public boolean onScale(ScaleGestureDetector detector) {
if (isFocusState()) {
float scaleFactor = mScaleFactor * detector.getScaleFactor();
float distance = calculateDistance(mImageCenterCorners[0], mImageCenterCorners[1], detector.getFocusX(), detector.getFocusY());
float scale = distance / mOldDistance;
float[] currentCorners = Arrays.copyOf(mCurrentImageCorners, mCurrentImageCorners.length);
mTempMatrix.reset();
mTempMatrix.postScale(scaleFactor, scaleFactor, mImageCenterCorners[0], mImageCenterCorners[1]);
mTempMatrix.mapPoints(currentCorners); //限制缩放不能小于原始尺寸四分之一//
float currentSize = calculateDistance(currentCorners[0], currentCorners[1], currentCorners[2], currentCorners[3]);
if (currentSize >= mMinWidth) {
mCurrentImageCorners = currentCorners;
mOldScale = scale;
}
invalidate();
return true;
}
return false;
}
});
#GestureDetector
一般手势监听（包括单击、滑动、触摸）
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53 @Override
public boolean onDown(MotionEvent event) {
float x = event.getX();
float y = event.getY();
mTouchDownX = x;
mTouchDownY = y;
if (isFocusState()) {
if (mBtnEditDrawable != null && mBtnEditDrawable.getBounds().contains((int) x, (int) y)) {
mTouchBtnType = TOUCH_BTN_EDIT;
return true;
} else if (mBtnRotationDrawable != null && mBtnRotationDrawable.getBounds().contains((int) x, (int) y)) {
mTouchBtnType = TOUCH_BTN_CONTROLL;
mOldDistance = calculateDistance(mImageCenterCorners[0], mImageCenterCorners[1], x, y);
mOldScale = 1;
return true;
} else if (mBtnDelDrawable != null && mBtnDelDrawable.getBounds().contains((int) x, (int) y)) {
mTouchBtnType = TOUCH_BTN_DELETE;
return true;
}
}
mTouchBtnType = TOUCH_NO_BTN;
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
//放大//拖动
if (mTouchBtnType == StickerView.TOUCH_BTN_CONTROLL) {
Log.d(TAG, "processScale");
processScale(e2.getX(), e2.getY());
invalidate();
return true;
}
return ((MarkLayout) getParent()).processScrollEvent(e1, e2, distanceX, distanceY);
}
@Override
public boolean onSingleTapUp(MotionEvent event) {
//触摸
//删除
if (mTouchBtnType == StickerView.TOUCH_BTN_DELETE
&& (mTouchDownX == event.getX() && mTouchDownY == event.getY())) {
delete();
return true;
}
//编辑
if (mTouchBtnType == TOUCH_BTN_EDIT
&& (mTouchDownX == event.getX() && mTouchDownY == event.getY())) {
editTDCode();
return true;
}
return ((MarkLayout) getParent()).processSingleTapUpEvent(event);
}
});
}