private View FindViewUnder()
{
int count = this.GetAdapter().ItemCount;
for (int i = count - 1; i >= 0; i--)
{
View child = GetChildAt(i);
if (child == null)
{
continue;
}
Region r = null;
if (((LinearLayoutManager)GetLayoutManager()).Orientation == LinearLayoutManager.Horizontal)
{
float translationX = ViewCompat.GetTranslationX(child);
r = new Region(
new Rect(
(int)(child.Left + translationX),
hoverCellCurrentBounds.Top,
(int)(child.Right + translationX),
hoverCellCurrentBounds.Bottom));
}
else
{
float translationY = ViewCompat.GetTranslationY(child);
r = new Region(
new Rect(
hoverCellCurrentBounds.Left,
(int)(child.Top + translationY),
hoverCellCurrentBounds.Right,
(int)(child.Bottom + translationY)));
}
r.InvokeOp(hoverCellCurrentBounds, Region.Op.Intersect);
if (!r.IsEmpty)
{
var ratio = (float)(r.Bounds.Width() * r.Bounds.Height())
/ (float)(hoverCellCurrentBounds.Width() * hoverCellCurrentBounds.Height());
LogHelper.Debug(TAG, string.Format("#{0}# is overlapped, ratio = {1}", (char)GetChildItemId(child), ratio));
if (ratio > 0.5)
{
if (GetChildItemId(child) == mobileItemId)
{
return(null);
}
LogHelper.Debug(TAG, string.Format("Swap with: {0}", (char)GetChildItemId(child)));
return(child);
}
}
}
return(null);
}
public static bool HitTest(this View v, int x, int y)
{
var tx = (int)(ViewCompat.GetTranslationX(v) + 0.5f);
var ty = (int)(ViewCompat.GetTranslationY(v) + 0.5f);
var left = v.Left + tx;
var right = v.Right + tx;
var top = v.Top + ty;
var bottom = v.Bottom + ty;
return(x >= left && x <= right && y >= top && y <= bottom);
}
// Long Press
public override void OnLongPress(MotionEvent e)
{
container.downX = (int)e.GetX();
container.downY = (int)e.GetY();
container.activePointerId = e.GetPointerId(0);
container.totalOffsetY = 0;
container.totalOffsetX = 0;
View selectedView = container.FindChildViewUnder(container.downX, container.downY);
if (selectedView == null)
{
return;
}
var vh = container.GetChildViewHolder(selectedView) as DraggableViewHolder;
if (vh == null)
{
return;
}
float translationX = ViewCompat.GetTranslationX(selectedView);
float translationY = ViewCompat.GetTranslationY(selectedView);
var selectedViewRect = new Rect(
(int)(selectedView.Left + translationX),
(int)(selectedView.Top + translationY),
(int)(selectedView.Right + translationX),
(int)(selectedView.Bottom + translationY));
if (!vh.CanDrag(selectedViewRect, container.downX, container.downY))
{
return;
}
container.mobileItemId = container.GetChildItemId(selectedView);
container.hoverCell = container.GetAndAddHoverView(selectedView);
selectedView.Visibility = ViewStates.Invisible;
container.cellIsMobile = true;
}