Clickable items in the displayed (current) wheel element

[GoogleCodeExporter]

Clickable items in the displayed (current) wheel element

[GoogleCodeExporter]

At the beginning the wheel control was designed only for displaying simple 
items w/o any control specific features like click events or animation.

It is a base control and of course it does not meet all your expectation :)
But it is possible to extend its functionality according to your needs.

Original comment by [email protected] on 12 Aug 2011 at 8:25

[GoogleCodeExporter]

I've observed differences between ListView and your Wheel sources with respect 
to handling onTouch events (and applying them to children items) and coundn't 
find out how to 'fix' wheel.

What exactly I need to change to get desirable functionality?

Thank you.

Original comment by [email protected] on 12 Aug 2011 at 8:59

[GoogleCodeExporter]

I'll investigate and let you know.
Thank you

Original comment by [email protected] on 12 Aug 2011 at 9:09

[GoogleCodeExporter]

To allow clicks on the current item look for the onTouchEvent method in 
WheelView and replace the line:
  if (items != 0 && isValidItemIndex(currentItem + items)) {
with:
  if (isValidItemIndex(currentItem + items)) {
or if you want to allow ONLY clicks on the current item:
  if (items == 0 && isValidItemIndex(currentItem)) {

Unfortunately even a 1 pixel movement with cause a scroll instead of a click. 
You might have to tweak the scrolling mechanism to consider a scroll < 10 
pixels (or something) a click too. For example by creating a member and 
constant:
  protected int scrolledDistance;
  private static final int MIN_DELTA_FOR_CLICKING = 25;
in WheelView and replacing the scrolling listener code with:

    // Scrolling listener
    WheelScroller.ScrollingListener scrollingListener = new WheelScroller.ScrollingListener() {
        public void onStarted() {
            isScrollingPerformed = false;
            scrolledDistance = 0;
            notifyScrollingListenersAboutStart();
        }

        public void onScroll(int distance) {
            doScroll(distance);

            scrolledDistance += Math.abs(distance);
            if (scrolledDistance > MIN_DELTA_FOR_CLICKING) {
                isScrollingPerformed = true;
            }

            int height = getHeight();
            if (scrollingOffset > height) {
                scrollingOffset = height;
                scroller.stopScrolling();
            } else if (scrollingOffset < -height) {
                scrollingOffset = -height;
                scroller.stopScrolling();
            }
        }

        public void onFinished() {
            notifyScrollingListenersAboutEnd();

            scrollingOffset = 0;
            invalidate();
        }

        public void onJustify() {
            if (Math.abs(scrollingOffset) > WheelScroller.MIN_DELTA_FOR_SCROLLING) {
                scroller.scroll(scrollingOffset, 0);
            }
        }
    };

Original comment by [email protected] on 9 Nov 2011 at 11:07