// ================================================================================
// ListView row animation helper
// ================================================================================
/**
* This method animates all other views in the ListView container (not including ignoreView)
* into their final positions. It is called after ignoreView has been removed from the
* adapter, but before layout has been run. The approach here is to figure out where
* everything is now, then allow layout to run, then figure out where everything is after
* layout, and then to run animations between all of those start/end positions.
*/
public void animateRemoval(ListView listview, View viewToRemove)
{
int firstVisiblePosition = listview.FirstVisiblePosition;
for (int i = 0; i < listview.ChildCount; ++i)
{
View child = listview.GetChildAt(i);
if (child != viewToRemove)
{
int pos = firstVisiblePosition + i;
long itemId = adapter.GetGroupId(pos);
if (!mItemIdTopMap.ContainsKey(itemId))
{
mItemIdTopMap.Add(itemId, child.Top);
}
else
{
mItemIdTopMap[itemId] = child.Top;
}
}
}
// Delete the item from the adapter
int position = listView.GetPositionForView(viewToRemove);
dataSource.RemoveAt(position);
adapter.NotifyDataSetChanged();
ViewTreeObserver observer = listview.ViewTreeObserver;
observer.AddOnPreDrawListener(new CustomOnPreDrawListener(listview, observer, adapter, mItemIdTopMap, moveView));
}
private void Init()
{
Inflate(Context, Resource.Layout.tooltip, this);
_topPointerView = FindViewById <ImageView>(Resource.Id.tooltip_pointer_up);
_contentHolder = (ViewGroup)FindViewById(Resource.Id.tooltip_contentholder);
_tooltipTextView = FindViewById <TextView>(Resource.Id.tooltip_contenttv);
_bottomPointerView = FindViewById <ImageView>(Resource.Id.tooltip_pointer_down);
_shadowView = FindViewById(Resource.Id.tooltip_shadow);
SetOnClickListener(this);
ViewTreeObserver.AddOnPreDrawListener(this);
}
/**
* This method determines whether the hover cell has been shifted far enough
* to invoke a cell swap. If so, then the respective cell swap candidate is
* determined and the data set is changed. Upon posting a notification of the
* data set change, a layout is invoked to place the cells in the right place.
* Using a ViewTreeObserver and a corresponding OnPreDrawListener, we can
* offset the cell being swapped to where it previously was and then animate it to
* its new position.
*/
void handleCellSwitch()
{
observeDeltaY = mLastEventY - mDownY;
int deltaYTotal = mHoverCellOriginalBounds.Top + mTotalOffset + observeDeltaY;
View belowView = getViewForID(mBelowItemId);
View mobileView = getViewForID(mMobileItemId);
View aboveView = getViewForID(mAboveItemId);
bool isBelow = (belowView != null) && (deltaYTotal > belowView.Top);
bool isAbove = (aboveView != null) && (deltaYTotal < aboveView.Top);
if (isBelow || isAbove)
{
observeSwitchItemID = isBelow ? mBelowItemId : mAboveItemId;
View switchView = isBelow ? belowView : aboveView;
int originalItem = GetPositionForView(mobileView);
if (switchView == null)
{
updateNeighborViewsForID(mMobileItemId);
return;
}
swapElements(mCheeseList, originalItem, GetPositionForView(switchView));
((BaseAdapter)Adapter).NotifyDataSetChanged();
mDownY = mLastEventY;
observeSwitchViewStartTop = switchView.Top;
mobileView.Visibility = ViewStates.Visible;
switchView.Visibility = ViewStates.Invisible;
updateNeighborViewsForID(mMobileItemId);
observer = ViewTreeObserver;
observer.AddOnPreDrawListener(this);
}
}