public bool OnTouch(global::Android.Views.View v, MotionEvent e)
{
int pointerIndex = ((int)(e.Action & MotionEventActions.PointerIdMask) >> (int)MotionEventActions.PointerIdShift);
int pointerId = e.GetPointerId(pointerIndex);
switch (e.Action & MotionEventActions.Mask)
{
case MotionEventActions.Down:
case MotionEventActions.PointerDown:
// user touched the screen
if (activeTouches.Count < MAX_TOUCH_COUNT)
{
UIAction touch = new UIAction(pointerId, new Vector2(e.GetX(pointerIndex), e.GetY(pointerIndex)));
activeTouches.Add(touch);
UIItem.HandleGlobalAction(UIActionType.Begin, touch);
}
break;
case MotionEventActions.Up:
case MotionEventActions.Cancel:
case MotionEventActions.PointerUp:
// user lifted the finger of the screen
int touchIndex = activeTouches.FindIndex((UIAction touch) => touch.ID == pointerId);
if (touchIndex != -1)
{
UIItem.HandleGlobalAction(UIActionType.End, activeTouches[touchIndex]);
activeTouches.RemoveAt(touchIndex);
}
break;
case MotionEventActions.Move:
// user moved the finger
for (int i = 0; i < activeTouches.Count; i++)
{
int activePointerIndex = e.FindPointerIndex(activeTouches[i].ID);
Vector2 activeTouchPosition = new Vector2(e.GetX(activePointerIndex), e.GetY(activePointerIndex));
if (activeTouches[i].Position - activeTouchPosition != Vector2.Zero)
{
// touch moved
Vector2 activeTouchRelativePosition = new Vector2((activeTouchPosition.X / Window.Size.Width - 0.5f) * 2 * Window.Ratio, (activeTouchPosition.Y / Window.Size.Height - 0.5f) * -2);
for (int j = 0; j < UIRenderer.Current.Count; j++)
{
UIItem item = UIRenderer.Current[j];
bool current = item.Collides(activeTouchRelativePosition);
bool last = item.Collides(activeTouches[i].RelativePosition);
if (current && !last)
{
// collides with the current position, but not with the last
if (item.HandleAction(UIActionType.Enter, activeTouches[i]))
{
for (int k = j + 1; k < UIRenderer.Current.Count; k++)
{
UIItem kitem = UIRenderer.Current[k];
if (kitem.Collides(activeTouches[i].RelativePosition))
{
kitem.HandleAction(UIActionType.Leave, activeTouches[i]);
}
}
}
}
else if (!current && last)
{
// collides with the last position, but not with the current -> touch moved out of UIelement
if (item.HandleAction(UIActionType.Leave, activeTouches[i]))
{
for (int k = j + 1; k < UIRenderer.Current.Count; k++)
{
UIItem kitem = UIRenderer.Current[k];
if (kitem.Collides(activeTouchRelativePosition))
{
kitem.HandleAction(UIActionType.Enter, activeTouches[i]);
break;
}
}
break;
}
}
else if (current)
{
// touch moved inside UI
if (item.HandleAction(UIActionType.Move, activeTouches[i]))
{
break;
}
}
}
activeTouches[i].Position = activeTouchPosition;
activeTouches[i].RelativePosition = activeTouchRelativePosition;
}
}
break;
}
return(true);
}