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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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