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;
}
private void updateDragging(MotionEvent ev) {
setHotspot(ev.getX(), ev.getY());
int x = (int) ev.getX();
Rect oldBounds = mThumb.getBounds();
int halfThumb = oldBounds.width() / 2;
int addedThumb = mAddedTouchBounds;
int newX = x - mDraggOffset + halfThumb;
int left = getPaddingLeft() + halfThumb + addedThumb;
int right = getWidth() - (getPaddingRight() + halfThumb + addedThumb);
if (newX < left) {
newX = left;
} else if (newX > right) {
newX = right;
}
int available = right - left;
float scale = (float) (newX - left) / (float) available;
if (isRtl()) {
scale = 1f - scale;
}
int progress = Math.round((scale * (mMax - mMin)) + mMin);
setProgress(progress, true);
}