@Override
public void onDrag(float dx, float dy) {
if (mScaleDragDetector.isScaling()) {
return; // Do not drag if we are already scaling
}
if (DEBUG) {
LogManager.getLogger().d(LOG_TAG, String.format("onDrag: dx: %.2f. dy: %.2f", dx, dy));
}
ImageView imageView = getImageView();
mSuppMatrix.postTranslate(dx, dy);
checkAndDisplayMatrix();
/**
* Here we decide whether to let the ImageView's parent to start taking over the touch event.
*
* <p>First we check whether this function is enabled. We never want the parent to take over if
* we're scaling. We then check the edge we're on, and the direction of the scroll (i.e. if
* we're pulling against the edge, aka 'overscrolling', let the parent take over).
*/
ViewParent parent = imageView.getParent();
if (mAllowParentInterceptOnEdge && !mScaleDragDetector.isScaling()) {
if (mScrollEdge == EDGE_BOTH
|| (mScrollEdge == EDGE_LEFT && dx >= 1f)
|| (mScrollEdge == EDGE_RIGHT && dx <= -1f)) {
if (null != parent) parent.requestDisallowInterceptTouchEvent(false);
}
} else {
if (null != parent) {
parent.requestDisallowInterceptTouchEvent(true);
}
}
}
@Override
public boolean onTouch(View v, MotionEvent ev) {
boolean handled = false;
if (mZoomEnabled && hasDrawable((ImageView) v)) {
ViewParent parent = v.getParent();
switch (ev.getAction()) {
case ACTION_DOWN:
// First, disable the Parent from intercepting the touch
// event
if (null != parent) parent.requestDisallowInterceptTouchEvent(true);
else Log.i(LOG_TAG, "onTouch getParent() returned null");
// If we're flinging, and the user presses down, cancel
// fling
cancelFling();
break;
case ACTION_CANCEL:
case ACTION_UP:
// If the user has zoomed less than min scale, zoom back
// to min scale
if (getScale() < mMinScale) {
RectF rect = getDisplayRect();
if (null != rect) {
v.post(
new AnimatedZoomRunnable(getScale(), mMinScale, rect.centerX(), rect.centerY()));
handled = true;
}
}
break;
}
// Try the Scale/Drag detector
if (null != mScaleDragDetector && mScaleDragDetector.onTouchEvent(ev)) {
handled = true;
}
// Check to see if the user double tapped
if (null != mGestureDetector && mGestureDetector.onTouchEvent(ev)) {
handled = true;
}
}
return handled;
}