private boolean startDragging(MotionEvent ev, boolean ignoreTrackIfInScrollContainer) {
final Rect bounds = mTempRect;
mThumb.copyBounds(bounds);
// Grow the current thumb rect for a bigger touch area
bounds.inset(-mAddedTouchBounds, -mAddedTouchBounds);
mIsDragging = (bounds.contains((int) ev.getX(), (int) ev.getY()));
if (!mIsDragging && mAllowTrackClick && !ignoreTrackIfInScrollContainer) {
// If the user clicked outside the thumb, we compute the current
// position
// and force an immediate drag to it.
mIsDragging = true;
mDraggOffset = (bounds.width() / 2) - mAddedTouchBounds;
updateDragging(ev);
// As the thumb may have moved, get the bounds again
mThumb.copyBounds(bounds);
bounds.inset(-mAddedTouchBounds, -mAddedTouchBounds);
}
if (mIsDragging) {
setPressed(true);
attemptClaimDrag();
setHotspot(ev.getX(), ev.getY());
mDraggOffset = (int) (ev.getX() - bounds.left - mAddedTouchBounds);
}
return mIsDragging;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled()) {
return false;
}
int actionMasked = MotionEventCompat.getActionMasked(event);
switch (actionMasked) {
case MotionEvent.ACTION_DOWN:
mDownX = event.getX();
startDragging(event, isInScrollingContainer());
break;
case MotionEvent.ACTION_MOVE:
if (isDragging()) {
updateDragging(event);
} else {
final float x = event.getX();
if (Math.abs(x - mDownX) > mTouchSlop) {
startDragging(event, false);
}
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
stopDragging();
break;
}
return true;
}