diff options
Diffstat (limited to 'Xamarin.Forms.Platform.iOS/Renderers/TableViewRenderer.cs')
| -rw-r--r-- | Xamarin.Forms.Platform.iOS/Renderers/TableViewRenderer.cs | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.iOS/Renderers/TableViewRenderer.cs b/Xamarin.Forms.Platform.iOS/Renderers/TableViewRenderer.cs new file mode 100644 index 00000000..a77b32cc --- /dev/null +++ b/Xamarin.Forms.Platform.iOS/Renderers/TableViewRenderer.cs @@ -0,0 +1,150 @@ +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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