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using System.Collections.Generic;
using ElmSharp;
namespace Xamarin.Forms.Platform.Tizen
{
public class ViewCellRenderer : CellRenderer
{
readonly Dictionary<EvasObject, ViewCell> _cacheCandidate = new Dictionary<EvasObject, ViewCell>();
public ViewCellRenderer() : base("full")
{
MainContentPart = "elm.swallow.content";
}
protected string MainContentPart { get; set; }
protected override EvasObject OnReusableContent(Cell cell, string part, EvasObject old)
{
if (_cacheCandidate.ContainsKey(old))
{
var viewCell = _cacheCandidate[old];
var widget = (old as Widget);
if (widget != null)
widget.IsEnabled = true;
viewCell.BindingContext = cell.BindingContext;
return old;
}
return null;
}
protected override EvasObject OnGetContent(Cell cell, string part)
{
if (part == MainContentPart)
{
var viewCell = (ViewCell)cell;
var listView = viewCell?.RealParent as ListView;
// It is a condition for reusable the cell
if (listView != null &&
listView.HasUnevenRows == false &&
!(listView.ItemTemplate is DataTemplateSelector) && !GetCurrentItem().IsGroupItem)
{
return CreateReusableContent(viewCell);
}
Platform.GetRenderer(viewCell.View)?.Dispose();
var renderer = Platform.GetOrCreateRenderer(viewCell.View);
int height = (int)viewCell.RenderHeight;
height = height > 0 ? height : FindCellContentHeight(viewCell);
renderer.NativeView.MinimumHeight = height;
return renderer.NativeView;
}
return null;
}
protected override bool OnCellPropertyChanged(Cell cell, string property, Dictionary<string, EvasObject> realizedView)
{
if (property == "View")
{
return true;
}
return base.OnCellPropertyChanged(cell, property, realizedView);
}
EvasObject CreateReusableContent(ViewCell viewCell)
{
var listView = viewCell.RealParent as ListView;
ViewCell duplicatedCell = (ViewCell)listView.ItemTemplate.CreateContent();
duplicatedCell.BindingContext = viewCell.BindingContext;
duplicatedCell.Parent = listView;
var renderer = Platform.GetOrCreateRenderer(duplicatedCell.View);
int height = (int)duplicatedCell.RenderHeight;
height = height > 0 ? height : FindCellContentHeight(duplicatedCell);
renderer.NativeView.MinimumHeight = height;
_cacheCandidate[renderer.NativeView] = duplicatedCell;
renderer.NativeView.Deleted += (sender, e) =>
{
_cacheCandidate.Remove((EvasObject)sender);
};
return renderer.NativeView;
}
}
}
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