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using System;
using System.ComponentModel;
using UIKit;
using RectangleF = CoreGraphics.CGRect;
using SizeF = CoreGraphics.CGSize;
namespace Xamarin.Forms.Platform.iOS
{
public class ViewCellRenderer : CellRenderer
{
public override UITableViewCell GetCell(Cell item, UITableViewCell reusableCell, UITableView tv)
{
var viewCell = (ViewCell)item;
var cell = reusableCell as ViewTableCell;
if (cell == null)
cell = new ViewTableCell(item.GetType().FullName);
else
cell.ViewCell.PropertyChanged -= ViewCellPropertyChanged;
viewCell.PropertyChanged += ViewCellPropertyChanged;
cell.ViewCell = viewCell;
SetRealCell(item, cell);
WireUpForceUpdateSizeRequested(item, cell, tv);
UpdateBackground(cell, item);
UpdateIsEnabled(cell, viewCell);
return cell;
}
static void UpdateIsEnabled(ViewTableCell cell, ViewCell viewCell)
{
cell.UserInteractionEnabled = viewCell.IsEnabled;
cell.TextLabel.Enabled = viewCell.IsEnabled;
}
void ViewCellPropertyChanged(object sender, PropertyChangedEventArgs e)
{
var viewCell = (ViewCell)sender;
var realCell = (ViewTableCell)GetRealCell(viewCell);
if (e.PropertyName == Cell.IsEnabledProperty.PropertyName)
UpdateIsEnabled(realCell, viewCell);
}
internal class ViewTableCell : UITableViewCell, INativeElementView
{
WeakReference<IVisualElementRenderer> _rendererRef;
ViewCell _viewCell;
Element INativeElementView.Element => ViewCell;
internal bool SupressSeparator { get; set; }
bool _disposed;
public ViewTableCell(string key) : base(UITableViewCellStyle.Default, key)
{
}
public ViewCell ViewCell
{
get { return _viewCell; }
set
{
if (_viewCell == value)
return;
UpdateCell(value);
}
}
public override void LayoutSubviews()
{
//This sets the content views frame.
base.LayoutSubviews();
//TODO: Determine how best to hide the separator line when there is an accessory on the cell
if (SupressSeparator && Accessory == UITableViewCellAccessory.None)
{
var oldFrame = Frame;
ContentView.Bounds = new RectangleF(oldFrame.Location, new SizeF(oldFrame.Width, oldFrame.Height + 0.5f));
}
var contentFrame = ContentView.Frame;
var view = ViewCell.View;
Layout.LayoutChildIntoBoundingRegion(view, contentFrame.ToRectangle());
if (_rendererRef == null)
return;
IVisualElementRenderer renderer;
if (_rendererRef.TryGetTarget(out renderer))
renderer.NativeView.Frame = view.Bounds.ToRectangleF();
}
public override SizeF SizeThatFits(SizeF size)
{
IVisualElementRenderer renderer;
if (!_rendererRef.TryGetTarget(out renderer))
return base.SizeThatFits(size);
if (renderer.Element == null)
return SizeF.Empty;
double width = size.Width;
var height = size.Height > 0 ? size.Height : double.PositiveInfinity;
var result = renderer.Element.Measure(width, height);
// make sure to add in the separator if needed
var finalheight = (float)result.Request.Height + (SupressSeparator ? 0f : 1f) / UIScreen.MainScreen.Scale;
return new SizeF(size.Width, finalheight);
}
protected override void Dispose(bool disposing)
{
if (_disposed)
return;
if (disposing)
{
IVisualElementRenderer renderer;
if (_rendererRef != null && _rendererRef.TryGetTarget(out renderer) && renderer.Element != null)
{
var platform = renderer.Element.Platform as Platform;
if (platform != null)
platform.DisposeModelAndChildrenRenderers(renderer.Element);
_rendererRef = null;
}
_viewCell = null;
}
_disposed = true;
base.Dispose(disposing);
}
IVisualElementRenderer GetNewRenderer()
{
var newRenderer = Platform.CreateRenderer(_viewCell.View);
_rendererRef = new WeakReference<IVisualElementRenderer>(newRenderer);
ContentView.AddSubview(newRenderer.NativeView);
return newRenderer;
}
void UpdateCell(ViewCell cell)
{
ICellController cellController = _viewCell;
if (cellController != null)
Device.BeginInvokeOnMainThread(cellController.SendDisappearing);
_viewCell = cell;
cellController = cell;
Device.BeginInvokeOnMainThread(cellController.SendAppearing);
IVisualElementRenderer renderer;
if (_rendererRef == null || !_rendererRef.TryGetTarget(out renderer))
renderer = GetNewRenderer();
else
{
if (renderer.Element != null && renderer == Platform.GetRenderer(renderer.Element))
renderer.Element.ClearValue(Platform.RendererProperty);
var type = Registrar.Registered.GetHandlerType(_viewCell.View.GetType());
if (renderer.GetType() == type || (renderer is Platform.DefaultRenderer && type == null))
renderer.SetElement(_viewCell.View);
else
{
//when cells are getting reused the element could be already set to another cell
//so we should dispose based on the renderer and not the renderer.Element
var platform = renderer.Element.Platform as Platform;
platform.DisposeRendererAndChildren(renderer);
renderer = GetNewRenderer();
}
}
Platform.SetRenderer(_viewCell.View, renderer);
}
}
}
}
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