private void SetItem(RecyclingContainerView aRoot, ItemType aItem)
{
ViewCache cache = aRoot.Tag as ViewCache;
Assert.Check(cache != null);
if (cache.ChildType == EChildViewType.Item)
{
RecycleItemView(iContext, aItem, cache);
}
else
{
DisconnectContainer(aRoot);
if (iDisconnectedItemViews.Count > 0)
{
View recycledView = iDisconnectedItemViews[0];
iDisconnectedItemViews.RemoveAt(0);
aRoot.Content = recycledView;
RecycleItemView(iContext, aItem, cache);
}
else
{
int childCount = aRoot.ChildCount;
View view = CreateItemView(iContext, aItem, aRoot);
Assert.Check(aRoot.ChildCount == childCount);
Assert.Check(view != null);
aRoot.Content = view;
RecycleItemView(iContext, aItem, cache);
}
cache.ChildType = EChildViewType.Item;
}
}
public virtual void Clear()
{
foreach (RecyclingContainerView view in iViews)
{
DisconnectContainer(view);
ViewCache cache = view.Tag as ViewCache;
view.Tag = null;
view.EventRequestDeleteClick -= EventRequestDeleteHandler;
view.EventConfirmDeleteClick -= EventConfirmDeleteHandler;
view.EventMoveUpClick -= EventMoveUpHandler;
view.EventMoveDownClick -= EventMoveDownHandler;
view.Dispose();
cache.Close();
cache.Dispose();
}
foreach (View v in iDisconnectedSectionHeaderViews)
{
v.Dispose();
}
iDisconnectedSectionHeaderViews.Clear();
foreach (View v in iDisconnectedItemViews)
{
v.Dispose();
}
iDisconnectedItemViews.Clear();
iViews.Clear();
}
private void SetHeader(RecyclingContainerView aRoot, SectionHeader <SectionHeaderType> aHeader)
{
ViewCache cache = aRoot.Tag as ViewCache;
Assert.Check(cache != null);
if (cache.ChildType == EChildViewType.Header)
{
RecycleSectionHeaderView(iContext, aHeader.Header, cache);
}
else
{
DisconnectContainer(aRoot);
if (iDisconnectedSectionHeaderViews.Count > 0)
{
View recycledView = iDisconnectedSectionHeaderViews[0];
iDisconnectedSectionHeaderViews.RemoveAt(0);
aRoot.Content = recycledView;
RecycleSectionHeaderView(iContext, aHeader.Header, cache);
}
else
{
int childCount = aRoot.ChildCount;
View view = CreateSectionHeaderView(iContext, aHeader.Header, aRoot);
Assert.Check(aRoot.ChildCount == childCount);
Assert.Check(view != null);
aRoot.Content = view;
RecycleSectionHeaderView(iContext, aHeader.Header, cache);
}
cache.ChildType = EChildViewType.Header;
}
}
private void DisconnectContainer(RecyclingContainerView aRoot)
{
ViewCache cache = aRoot.Tag as ViewCache;
Assert.Check(cache != null);
View disconnectedChild = aRoot.Content;
switch (cache.ChildType)
{
case EChildViewType.Header:
{
if (iDisconnectedSectionHeaderViews.Count < kMaxDisconnectedViews)
{
iDisconnectedSectionHeaderViews.Add(disconnectedChild);
}
else
{
DestroySectionHeaderView(iContext, cache);
disconnectedChild.Dispose();
disconnectedChild = null;
}
break;
}
case EChildViewType.Item:
{
if (iDisconnectedItemViews.Count < kMaxDisconnectedViews)
{
iDisconnectedItemViews.Add(disconnectedChild);
}
else
{
DestroyItemView(iContext, cache);
disconnectedChild.Dispose();
disconnectedChild = null;
}
break;
}
default:
{
Assert.Check(false);
break;
}
}
aRoot.Content = null;
cache.Clear();
}
private void EventRequestDeleteHandler(object sender, EventArgs args)
{
RecyclingContainerView senderView = sender as RecyclingContainerView;
ViewCache cache = senderView.Tag as ViewCache;
Assert.Check(cache != null);
if (cache.Position == iDeleteIndex)
{
iDeleteIndex = -1;
}
else
{
iDeleteIndex = cache.Position;
}
NotifyDataSetChanged();
}
private void EventMoveDownHandler(object sender, EventArgs args)
{
RecyclingContainerView senderView = sender as RecyclingContainerView;
ViewCache cache = senderView.Tag as ViewCache;
Assert.Check(cache != null);
int position = cache.Position;
SectionHeader <SectionHeaderType> header = GetSectionHeader(position);
if (header != null)
{
OnEventSectionMovedDown(header.Header, position);
}
else
{
int loaderPosition = GetLoaderPosition(position);
ItemType item = iLoader.Item(loaderPosition);
Assert.Check(item != null);
OnEventItemMovedDown(item, position);
}
}
private RecyclingContainerView CreateContainerView(Context aContext)
{
RecyclingContainerView result = new RecyclingContainerView(aContext, RequestDeleteButtonResourceId, ConfirmDeleteButtonResourceId, MoveDownButtonResourceId, MoveUpButtonResourceId);
using (ListView.LayoutParams layoutParams = new ListView.LayoutParams(ListView.LayoutParams.FillParent, ListView.LayoutParams.WrapContent))
{
result.LayoutParameters = layoutParams;
}
ViewCache cache = new ViewCache(result);
result.Tag = cache;
View view = CreateItemView(aContext, default(ItemType), result);
result.EditMode = EItemEditMode.None;
Assert.Check(view != null);
result.Content = view;
result.EventRequestDeleteClick += EventRequestDeleteHandler;
result.EventConfirmDeleteClick += EventConfirmDeleteHandler;
result.EventMoveUpClick += EventMoveUpHandler;
result.EventMoveDownClick += EventMoveDownHandler;
iViews.Add(result);
return(result);
}
protected virtual void RecycleSectionHeaderView(Context aContext, SectionHeaderType aSectionHeader, ViewCache aViewCache)
{
}
public override View GetView(int aPosition, View aConvertView, ViewGroup aParent)
{
RecyclingContainerView root = aConvertView as RecyclingContainerView;
if (root == null)
{
root = CreateContainerView(iContext);
}
else if (root.HasResurfacedWithoutJNIHandle)
{
UserLog.WriteLine("Ticket #1194: Item has resurfaced after dispose! - " + iId);
Assert.Check(false);
}
ViewCache cache = root.Tag as ViewCache;
Assert.Check(cache != null);
cache.Position = aPosition;
SectionHeader <SectionHeaderType> header = GetSectionHeader(aPosition);
ItemType item = default(ItemType);
bool isPlaceholder = false;
if (header != null)
{
SetHeader(root, header);
}
else
{
int loaderPosition = GetLoaderPosition(aPosition);
item = iLoader.Item(loaderPosition);
if (item != null)
{
SetItem(root, item);
}
else
{
SetItem(root, default(ItemType));
isPlaceholder = true;
}
}
if (iEditMode && !isPlaceholder)
{
root.EditMode = aPosition == iDeleteIndex ? EItemEditMode.ConfirmDelete : EItemEditMode.Editing;
if (header != null)
{
root.CanDelete = CanDeleteSection(header.Header, aPosition);
root.CanMoveUp = CanMoveSectionUp(header.Header, aPosition);
root.CanMoveDown = CanMoveSectionDown(header.Header, aPosition);
}
else
{
root.CanDelete = CanDeleteItem(item, aPosition);
root.CanMoveUp = CanMoveItemUp(item, aPosition);
root.CanMoveDown = CanMoveItemDown(item, aPosition);
}
}
else
{
root.EditMode = EItemEditMode.None;
}
root.IsFirst = aPosition == 0;
root.IsLast = aPosition == Count - 1;
return(root);
}
protected virtual void DestroyItemView(Context aContext, ViewCache aViewCache)
{
}
protected virtual void DestroySectionHeaderView(Context aContext, ViewCache aViewCache)
{
}
protected virtual void RecycleItemView(Context aContext, ItemType aItem, ViewCache aViewCache)
{
}