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using System;
using System.ComponentModel;
using System.Drawing;
using System.Collections.Generic;
#if __UNIFIED__
using UIKit;
using RectangleF = CoreGraphics.CGRect;
#else
using MonoTouch.UIKit;
#endif
namespace Xamarin.Forms.Platform.iOS
{
public class TableViewRenderer : ViewRenderer<TableView, UITableView>
{
KeyboardInsetTracker _insetTracker;
UIView _originalBackgroundView;
RectangleF _previousFrame;
public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
{
return Control.GetSizeRequest(widthConstraint, heightConstraint, 44, 44);
}
public override void LayoutSubviews()
{
base.LayoutSubviews();
if (_previousFrame != Frame)
{
_previousFrame = Frame;
_insetTracker?.UpdateInsets();
}
}
protected override void Dispose(bool disposing)
{
if (disposing && _insetTracker != null)
{
_insetTracker.Dispose();
_insetTracker = null;
var viewsToLookAt = new Stack<UIView>(Subviews);
while (viewsToLookAt.Count > 0)
{
var view = viewsToLookAt.Pop();
var viewCellRenderer = view as ViewCellRenderer.ViewTableCell;
if (viewCellRenderer != null)
viewCellRenderer.Dispose();
else
{
foreach (var child in view.Subviews)
viewsToLookAt.Push(child);
}
}
}
base.Dispose(disposing);
}
protected override void OnElementChanged(ElementChangedEventArgs<TableView> e)
{
if (e.NewElement != null)
{
var style = UITableViewStyle.Plain;
if (e.NewElement.Intent != TableIntent.Data)
style = UITableViewStyle.Grouped;
if (Control == null || Control.Style != style)
{
if (Control != null)
{
_insetTracker.Dispose();
Control.Dispose();
}
var tv = new UITableView(RectangleF.Empty, style);
_originalBackgroundView = tv.BackgroundView;
SetNativeControl(tv);
if (Forms.IsiOS9OrNewer)
tv.CellLayoutMarginsFollowReadableWidth = false;
_insetTracker = new KeyboardInsetTracker(tv, () => Control.Window, insets => Control.ContentInset = Control.ScrollIndicatorInsets = insets, point =>
{
var offset = Control.ContentOffset;
offset.Y += point.Y;
Control.SetContentOffset(offset, true);
});
}
SetSource();
UpdateRowHeight();
UpdateBackgroundView();
}
base.OnElementChanged(e);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == "RowHeight")
UpdateRowHeight();
else if (e.PropertyName == "HasUnevenRows")
SetSource();
else if (e.PropertyName == "BackgroundColor")
UpdateBackgroundView();
}
protected override void UpdateNativeWidget()
{
if (Element.Opacity < 1)
{
if (!Control.Layer.ShouldRasterize)
{
Control.Layer.RasterizationScale = UIScreen.MainScreen.Scale;
Control.Layer.ShouldRasterize = true;
}
}
else
Control.Layer.ShouldRasterize = false;
base.UpdateNativeWidget();
}
void SetSource()
{
var modeledView = Element;
Control.Source = modeledView.HasUnevenRows ? new UnEvenTableViewModelRenderer(modeledView) : new TableViewModelRenderer(modeledView);
}
void UpdateBackgroundView()
{
Control.BackgroundView = Element.BackgroundColor == Color.Default ? _originalBackgroundView : null;
}
void UpdateRowHeight()
{
var height = Element.RowHeight;
if (height <= 0)
height = 44;
Control.RowHeight = height;
}
}
}
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