/**
* Scroll to child.
*
* @param i the i
*/
void scrollToChild(int i) {
CarouselItemView view = (CarouselItemView) getAdapter().getView(i, null, null);
float angle = view.getCurrentAngle();
if (angle == 0) return;
if (angle > 180.0f) angle = 360.0f - angle;
else angle = -angle;
mFlingRunnable.startUsingDistance(angle);
}
/**
* 描述：TODO
*
* @see android.view.GestureDetector.OnGestureListener#onFling(android.view.MotionEvent,
* android.view.MotionEvent, float, float)
* @author: zhaoqp
* @date：2013-11-28 上午11:14:35
* @version v1.0
*/
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
if (!mShouldCallbackDuringFling) {
// We want to suppress selection changes
// Remove any future code to set mSuppressSelectionChanged = false
removeCallbacks(mDisableSuppressSelectionChangedRunnable);
// This will get reset once we scroll into slots
if (!mSuppressSelectionChanged) mSuppressSelectionChanged = true;
}
// Fling the gallery!
// mFlingRunnable.startUsingVelocity((int) -velocityX);
mFlingRunnable.startUsingVelocity((int) velocityX);
return true;
}
/**
* 描述：TODO
*
* @see android.view.GestureDetector.OnGestureListener#onDown(android.view.MotionEvent)
* @author: zhaoqp
* @date：2013-11-28 上午11:14:35
* @version v1.0
*/
public boolean onDown(MotionEvent e) {
// Kill any existing fling/scroll
mFlingRunnable.stop(false);
///// Don't know yet what for it is
// Get the item's view that was touched
mDownTouchPosition = pointToPositionView((int) e.getX(), (int) e.getY());
if (mDownTouchPosition >= 0) {
mDownTouchView = getChildAt(mDownTouchPosition - mFirstPosition);
mDownTouchView.setPressed(true);
}
// Reset the multiple-scroll tracking state
mIsFirstScroll = true;
// Must return true to get matching events for this down event.
return true;
}
/** Brings an item with nearest to 0 degrees angle to this angle and sets it selected. */
private void scrollIntoSlots() {
// Nothing to do
if (getChildCount() == 0 || mSelectedChild == null) return;
// get nearest item to the 0 degrees angle
// Sort itmes and get nearest angle
float angle;
int position;
ArrayList<CarouselItemView> arr = new ArrayList<CarouselItemView>();
for (int i = 0; i < getAdapter().getCount(); i++)
arr.add(((CarouselItemView) getAdapter().getView(i, null, null)));
Collections.sort(
arr,
new Comparator<CarouselItemView>() {
public int compare(CarouselItemView c1, CarouselItemView c2) {
int a1 = (int) c1.getCurrentAngle();
if (a1 > 180) a1 = 360 - a1;
int a2 = (int) c2.getCurrentAngle();
if (a2 > 180) a2 = 360 - a2;
return (a1 - a2);
}
});
angle = arr.get(0).getCurrentAngle();
// Make it minimum to rotate
if (angle > 180.0f) angle = -(360.0f - angle);
// Start rotation if needed
if (angle != 0.0f) {
mFlingRunnable.startUsingDistance(-angle);
} else {
// Set selected position
position = arr.get(0).getIndex();
setSelectedPositionInt(position);
onFinishedMovement();
}
}