public override NSView GetViewForItem(NSTableView tableView, NSTableColumn tableColumn, nint row)
{
var sectionIndex = 0;
var itemIndexInSection = (int)row;
Cell cell;
var isHeader = false;
if (IsGroupingEnabled)
{
GetComputedIndexes(row, out sectionIndex, out itemIndexInSection, out isHeader);
}
var indexPath = NSIndexPath.FromItemSection(itemIndexInSection, sectionIndex);
var templateId = isHeader ? "headerCell" : TemplateIdForPath(indexPath).ToString();
NSView nativeCell;
var cachingStrategy = Controller.CachingStrategy;
if (cachingStrategy == ListViewCachingStrategy.RetainElement)
{
cell = GetCellForPath(indexPath, isHeader);
nativeCell = CellNSView.GetNativeCell(tableView, cell, templateId, isHeader);
}
else if (cachingStrategy == ListViewCachingStrategy.RecycleElement)
{
nativeCell = tableView.MakeView(templateId, tableView);
if (nativeCell == null)
{
cell = GetCellForPath(indexPath, isHeader);
nativeCell = CellNSView.GetNativeCell(tableView, cell, templateId, isHeader, true);
}
else
{
var templatedList = TemplatedItemsView.TemplatedItems.GetGroup(sectionIndex);
cell = (Cell)((INativeElementView)nativeCell).Element;
ICellController controller = cell;
controller.SendDisappearing();
templatedList.UpdateContent(cell, itemIndexInSection);
controller.SendAppearing();
}
}
else
{
throw new NotSupportedException();
}
return(nativeCell);
}
public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPath)
{
UITableViewCell nativeCell = null;
var cachingStrategy = Controller.CachingStrategy;
if (cachingStrategy == ListViewCachingStrategy.RetainElement)
{
var cell = GetCellForPath(indexPath);
nativeCell = CellTableViewCell.GetNativeCell(tableView, cell);
}
else if (cachingStrategy == ListViewCachingStrategy.RecycleElement)
{
var id = TemplateIdForPath(indexPath);
nativeCell = tableView.DequeueReusableCell(ContextActionsCell.Key + id);
if (nativeCell == null)
{
var cell = GetCellForPath(indexPath);
nativeCell = CellTableViewCell.GetNativeCell(tableView, cell, true, id.ToString());
}
else
{
var templatedList = TemplatedItemsView.TemplatedItems.GetGroup(indexPath.Section);
var cell = (Cell)((INativeElementView)nativeCell).Element;
ICellController controller = cell;
controller.SendDisappearing();
templatedList.UpdateContent(cell, indexPath.Row);
controller.SendAppearing();
}
}
else
{
throw new NotSupportedException();
}
var bgColor = tableView.IndexPathForSelectedRow != null && tableView.IndexPathForSelectedRow.Equals(indexPath) ? UIColor.Clear : DefaultBackgroundColor;
SetCellBackgroundColor(nativeCell, bgColor);
return(nativeCell);
}
public override AView GetView(int position, AView convertView, ViewGroup parent)
{
Cell cell = null;
Performance.Start();
ListViewCachingStrategy cachingStrategy = Controller.CachingStrategy;
var nextCellIsHeader = false;
if (cachingStrategy == ListViewCachingStrategy.RetainElement || convertView == null)
{
if (_listView.IsGroupingEnabled)
{
List <Cell> cells = GetCellsFromPosition(position, 2);
if (cells.Count > 0)
{
cell = cells[0];
}
if (cells.Count == 2)
{
nextCellIsHeader = cells[1].GetIsGroupHeader <ItemsView <Cell>, Cell>();
}
}
if (cell == null)
{
cell = GetCellForPosition(position);
if (cell == null)
{
return(new AView(_context));
}
}
}
var cellIsBeingReused = false;
var layout = convertView as ConditionalFocusLayout;
if (layout != null)
{
cellIsBeingReused = true;
convertView = layout.GetChildAt(0);
}
else
{
layout = new ConditionalFocusLayout(_context)
{
Orientation = Orientation.Vertical
}
};
if (cachingStrategy == ListViewCachingStrategy.RecycleElement && convertView != null)
{
var boxedCell = convertView as INativeElementView;
if (boxedCell == null)
{
throw new InvalidOperationException($"View for cell must implement {nameof(INativeElementView)} to enable recycling.");
}
cell = (Cell)boxedCell.Element;
// We are going to re-set the Platform here because in some cases (headers mostly) its possible this is unset and
// when the binding context gets updated the measure passes will all fail. By applying this here the Update call
// further down will result in correct layouts.
cell.Platform = _listView.Platform;
ICellController cellController = cell;
cellController.SendDisappearing();
int row = position;
var group = 0;
var templatedItems = TemplatedItemsView.TemplatedItems;
if (_listView.IsGroupingEnabled)
{
group = templatedItems.GetGroupIndexFromGlobal(position, out row);
}
var templatedList = templatedItems.GetGroup(group);
if (_listView.IsGroupingEnabled)
{
if (row == 0)
{
templatedList.UpdateHeader(cell, group);
}
else
{
templatedList.UpdateContent(cell, row - 1);
}
}
else
{
templatedList.UpdateContent(cell, row);
}
cellController.SendAppearing();
if (cell.BindingContext == ActionModeObject)
{
ActionModeContext = cell;
ContextView = layout;
}
if (ReferenceEquals(_listView.SelectedItem, cell.BindingContext))
{
Select(_listView.IsGroupingEnabled ? row - 1 : row, layout);
}
else if (cell.BindingContext == ActionModeObject)
{
SetSelectedBackground(layout, true);
}
else
{
UnsetSelectedBackground(layout);
}
Performance.Stop();
return(layout);
}
AView view = CellFactory.GetCell(cell, convertView, parent, _context, _listView);
Performance.Start("AddView");
if (cellIsBeingReused)
{
if (convertView != view)
{
layout.RemoveViewAt(0);
layout.AddView(view, 0);
}
}
else
{
layout.AddView(view, 0);
}
Performance.Stop("AddView");
bool isHeader = cell.GetIsGroupHeader <ItemsView <Cell>, Cell>();
AView bline;
UpdateSeparatorVisibility(cell, cellIsBeingReused, isHeader, nextCellIsHeader, layout, out bline);
UpdateSeparatorColor(isHeader, bline);
if ((bool)cell.GetValue(IsSelectedProperty))
{
Select(position, layout);
}
else
{
UnsetSelectedBackground(layout);
}
layout.ApplyTouchListenersToSpecialCells(cell);
Performance.Stop();
return(layout);
}
public override AView GetView(int position, AView convertView, ViewGroup parent)
{
Cell cell = null;
Performance.Start(out string reference);
ListViewCachingStrategy cachingStrategy = Controller.CachingStrategy;
var nextCellIsHeader = false;
if (cachingStrategy == ListViewCachingStrategy.RetainElement || convertView == null)
{
if (_listView.IsGroupingEnabled)
{
List <Cell> cells = GetCellsFromPosition(position, 2);
if (cells.Count > 0)
{
cell = cells[0];
}
if (cells.Count == 2)
{
nextCellIsHeader = cells[1].GetIsGroupHeader <ItemsView <Cell>, Cell>();
}
}
if (cell == null)
{
cell = GetCellForPosition(position);
if (cell == null)
{
Performance.Stop(reference);
return(new AView(_context));
}
}
}
var cellIsBeingReused = false;
var layout = convertView as Handlers.Compatibility.ConditionalFocusLayout;
if (layout != null)
{
cellIsBeingReused = true;
convertView = layout.GetChildAt(0);
}
else
{
layout = new Handlers.Compatibility.ConditionalFocusLayout(_context)
{
Orientation = Orientation.Vertical
};
_layoutsCreated.Add(layout);
}
if (((cachingStrategy & ListViewCachingStrategy.RecycleElement) != 0) && convertView != null)
{
var boxedCell = convertView as INativeElementView;
if (boxedCell == null)
{
throw new InvalidOperationException($"View for cell must implement {nameof(INativeElementView)} to enable recycling.");
}
cell = (Cell)boxedCell.Element;
ICellController cellController = cell;
cellController.SendDisappearing();
int row = position;
var group = 0;
var templatedItems = TemplatedItemsView.TemplatedItems;
if (_listView.IsGroupingEnabled)
{
group = templatedItems.GetGroupIndexFromGlobal(position, out row);
}
var templatedList = templatedItems.GetGroup(group);
if (_listView.IsGroupingEnabled)
{
if (row == 0)
{
templatedList.UpdateHeader(cell, group);
}
else
{
templatedList.UpdateContent(cell, row - 1);
}
}
else
{
templatedList.UpdateContent(cell, row);
}
cellController.SendAppearing();
if (cell.BindingContext == ActionModeObject)
{
ActionModeContext = cell;
ContextView = layout;
}
if (ReferenceEquals(_listView.SelectedItem, cell.BindingContext))
{
Select(_listView.IsGroupingEnabled ? row - 1 : row, layout);
}
else if (cell.BindingContext == ActionModeObject)
{
SetSelectedBackground(layout, true);
}
else
{
UnsetSelectedBackground(layout);
}
Performance.Stop(reference);
return(layout);
}
AView view = CellFactory.GetCell(cell, convertView, parent, _context, _listView);
Performance.Start(reference, "AddView");
if (cellIsBeingReused)
{
if (convertView != view)
{
layout.RemoveViewAt(0);
layout.AddView(view, 0);
}
}
else
{
layout.AddView(view, 0);
}
Performance.Stop(reference, "AddView");
bool isHeader = cell.GetIsGroupHeader <ItemsView <Cell>, Cell>();
AView bline;
bool isSeparatorVisible = _listView.SeparatorVisibility == SeparatorVisibility.Default;
if (isSeparatorVisible)
{
UpdateSeparatorVisibility(cell, cellIsBeingReused, isHeader, nextCellIsHeader, isSeparatorVisible, layout, out bline);
UpdateSeparatorColor(isHeader, bline);
}
else if (layout.ChildCount > 1)
{
layout.RemoveViewAt(1);
}
if ((bool)cell.GetValue(IsSelectedProperty))
{
Select(position, layout);
}
else
{
UnsetSelectedBackground(layout);
}
layout.ApplyTouchListenersToSpecialCells(cell);
Performance.Stop(reference);
return(layout);
}
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
var realPosition = GetRealPosition(position);
ContentCell cell = null;
Performance.Start(out string reference);
var container = holder.ItemView as ContentCellContainer;
ListViewCachingStrategy cachingStrategy = Controller.CachingStrategy;
if (cachingStrategy == ListViewCachingStrategy.RetainElement || container.IsEmpty)
{
cell = (ContentCell)GetCellFromPosition(realPosition);
}
var cellIsBeingReused = false;
if (container.ChildCount > 0)
{
cellIsBeingReused = true;
}
if (((cachingStrategy & ListViewCachingStrategy.RecycleElement) != 0) && !container.IsEmpty)
{
var boxedCell = container as INativeElementView;
if (boxedCell == null)
{
throw new InvalidOperationException($"View for cell must implement {nameof(INativeElementView)} to enable recycling.");
}
cell = (ContentCell)boxedCell.Element;
// We are going to re-set the Platform here because in some cases (headers mostly) its possible this is unset and
// when the binding context gets updated the measure passes will all fail. By applying this here the Update call
// further down will result in correct layouts.
cell.Platform = _collectionView.Platform;
ICellController cellController = cell;
cellController.SendDisappearing();
int row = realPosition;
var group = 0;
var templatedItems = TemplatedItemsView.TemplatedItems;
if (_collectionView.IsGroupingEnabled)
{
group = templatedItems.GetGroupIndexFromGlobal(realPosition, out row);
if (group < 0)
{
return;
}
}
var templatedList = templatedItems.GetGroup(group);
if (_collectionView.IsGroupingEnabled)
{
if (row == 0)
{
templatedList.UpdateHeader(cell, group);
}
else
{
templatedList.UpdateContent(cell, row - 1);
}
}
else
{
templatedList.UpdateContent(cell, row);
}
cellController.SendAppearing();
Performance.Stop(reference);
_recyclerView.RequestLayout();
_recyclerView.Invalidate();
return;
}
if (cell == null)
{
return;
}
AView view = GetCell(cell, container, _recyclerView, _context, _collectionView);
Performance.Start(reference, "AddView");
if (cellIsBeingReused)
{
if (container != view)
{
holder.ItemView = view;
}
}
else
{
holder.ItemView = view;
}
Performance.Stop(reference, "AddView");
Performance.Stop(reference);
}