/**
* Handles a {@link MotionEvent#ACTION_DOWN} event.
*
* @param x the x-coordinate of the down action
* @param y the y-coordinate of the down action
*/
private void OnActionDown(float x, float y)
{
float left = EdgeManager.LEFT.coordinate;
float top = EdgeManager.TOP.coordinate;
float right = EdgeManager.RIGHT.coordinate;
float bottom = EdgeManager.BOTTOM.coordinate;
mPressedHandle = HandleUtil.getPressedHandle(x, y, left, top, right, bottom, mHandleRadius);
if (mPressedHandle == null)
{
return;
}
// Calculate the offset of the touch point from the precise location
// of the handle. Save these values in a member variable since we want
// to maintain this offset as we drag the handle.
mTouchOffset = HandleUtil.getOffset(mPressedHandle, x, y, left, top, right, bottom);
Invalidate();
}