@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);
}
}
}
