diff options
Diffstat (limited to 'Xamarin.Forms.Platform.MacOS/Renderers/MasterDetailPageRenderer.cs')
| -rw-r--r-- | Xamarin.Forms.Platform.MacOS/Renderers/MasterDetailPageRenderer.cs | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.MacOS/Renderers/MasterDetailPageRenderer.cs b/Xamarin.Forms.Platform.MacOS/Renderers/MasterDetailPageRenderer.cs new file mode 100644 index 00000000..8d2fd551 --- /dev/null +++ b/Xamarin.Forms.Platform.MacOS/Renderers/MasterDetailPageRenderer.cs @@ -0,0 +1,204 @@ +using System; +using System.ComponentModel; +using System.Linq; +using AppKit; +using CoreGraphics; + +namespace Xamarin.Forms.Platform.MacOS +{ + public class MasterDetailPageRenderer : NSSplitViewController, IVisualElementRenderer, IEffectControlProvider + { + bool _disposed; + EventTracker _events; + VisualElementTracker _tracker; + MasterDetailPage _masterDetailPage; + + IPageController PageController => Element as IPageController; + + void IEffectControlProvider.RegisterEffect(Effect effect) + { + var platformEffect = effect as PlatformEffect; + if (platformEffect != null) + platformEffect.Container = View; + } + + protected MasterDetailPage MasterDetailPage => _masterDetailPage ?? (_masterDetailPage = (MasterDetailPage)Element); + + protected override void Dispose(bool disposing) + { + if (!_disposed && disposing) + { + PageController?.SendDisappearing(); + + if (Element != null) + { + Element.PropertyChanged -= HandlePropertyChanged; + Element = null; + } + + ClearControllers(); + + _tracker?.Dispose(); + _tracker = null; + _events?.Dispose(); + _events = null; + + _disposed = true; + } + base.Dispose(disposing); + } + + public NSViewController ViewController => this; + + public NSView NativeView => View; + + public VisualElement Element { get; private set; } + + public event EventHandler<VisualElementChangedEventArgs> ElementChanged; + + public SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint) + { + return NativeView.GetSizeRequest(widthConstraint, heightConstraint); + } + + public void SetElement(VisualElement element) + { + var oldElement = Element; + Element = element; + + UpdateControllers(); + + OnElementChanged(new VisualElementChangedEventArgs(oldElement, element)); + + EffectUtilities.RegisterEffectControlProvider(this, oldElement, element); + } + + public void SetElementSize(Size size) + { + Element.Layout(new Rectangle(Element.X, Element.Y, size.Width, size.Height)); + UpdateChildrenLayout(); + } + + protected virtual void OnElementChanged(VisualElementChangedEventArgs e) + { + if (e.OldElement != null) + e.OldElement.PropertyChanged -= HandlePropertyChanged; + + if (e.NewElement != null) + e.NewElement.PropertyChanged += HandlePropertyChanged; + + ElementChanged?.Invoke(this, e); + } + + protected virtual double MasterWidthPercentage => 0.3; + + public override void ViewWillAppear() + { + UpdateBackground(); + _tracker = new VisualElementTracker(this); + _events = new EventTracker(this); + _events.LoadEvents(NativeView); + UpdateChildrenLayout(); + + base.ViewWillAppear(); + } + + public override CGRect GetEffectiveRect(NSSplitView splitView, CGRect proposedEffectiveRect, CGRect drawnRect, + nint dividerIndex) + { + return CGRect.Empty; + } + + void UpdateChildrenLayout() + { + if (View.Frame.Width == -1) + return; + var width = View.Frame.Width; + var masterWidth = MasterWidthPercentage * width; + if (SplitViewItems.Length > 0) + SplitViewItems[0].MaximumThickness = SplitViewItems[0].MinimumThickness = (nfloat)masterWidth; + } + + void HandlePropertyChanged(object sender, PropertyChangedEventArgs e) + { + if (_tracker == null) + return; + + if (e.PropertyName == "Master" || e.PropertyName == "Detail") + UpdateControllers(); + } + + void UpdateControllers() + { + ClearControllers(); + + if (Platform.GetRenderer(MasterDetailPage.Master) == null) + Platform.SetRenderer(MasterDetailPage.Master, Platform.CreateRenderer(MasterDetailPage.Master)); + if (Platform.GetRenderer(MasterDetailPage.Detail) == null) + Platform.SetRenderer(MasterDetailPage.Detail, Platform.CreateRenderer(MasterDetailPage.Detail)); + + AddSplitViewItem(new NSSplitViewItem + { + ViewController = new ViewControllerWrapper(Platform.GetRenderer(MasterDetailPage.Master)) + }); + AddSplitViewItem(new NSSplitViewItem + { + ViewController = new ViewControllerWrapper(Platform.GetRenderer(MasterDetailPage.Detail)) + }); + + UpdateChildrenLayout(); + } + + void ClearControllers() + { + while (SplitViewItems.Length > 0) + { + var splitItem = SplitViewItems.Last(); + var childVisualRenderer = splitItem.ViewController as ViewControllerWrapper; + RemoveSplitViewItem(splitItem); + IVisualElementRenderer render = null; + if (childVisualRenderer.RendererWeakRef.TryGetTarget(out render)) + { + render.Dispose(); + } + childVisualRenderer.Dispose(); + childVisualRenderer = null; + } + } + + //TODO: Implement Background color on MDP + void UpdateBackground() + { + } + + sealed class ViewControllerWrapper : NSViewController + { + internal WeakReference<IVisualElementRenderer> RendererWeakRef; + + public ViewControllerWrapper(IVisualElementRenderer renderer) + { + RendererWeakRef = new WeakReference<IVisualElementRenderer>(renderer); + View = new NSView { WantsLayer = true }; + AddChildViewController(renderer.ViewController); + View.AddSubview(renderer.NativeView); + } + + public override void ViewWillLayout() + { + IVisualElementRenderer renderer; + if (RendererWeakRef.TryGetTarget(out renderer)) + renderer?.Element?.Layout(new Rectangle(0, 0, View.Bounds.Width, View.Bounds.Height)); + base.ViewWillLayout(); + } + + protected override void Dispose(bool disposing) + { + if (disposing && RendererWeakRef != null) + { + RendererWeakRef = null; + } + base.Dispose(disposing); + } + } + } +}
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