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RendererToHandlerShim.cs
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RendererToHandlerShim.cs
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using System;
using ViewHandler = Microsoft.Maui.Handlers.ViewHandler<Microsoft.Maui.IView, UIKit.UIView>;
using UIKit;
using Microsoft.Maui.Controls.Compatibility.Platform.iOS;
using Microsoft.Maui.Handlers;
namespace Microsoft.Maui.Controls.Compatibility
{
public class RendererToHandlerShim : ViewHandler
{
internal IVisualElementRenderer VisualElementRenderer { get; private set; }
public static IViewHandler CreateShim(object renderer)
{
if (renderer is IViewHandler handler)
return handler;
if (renderer is IVisualElementRenderer ivr)
return new RendererToHandlerShim(ivr);
return new RendererToHandlerShim();
}
public RendererToHandlerShim() : base(Handlers.ViewHandler.ViewMapper)
{
}
public RendererToHandlerShim(IVisualElementRenderer visualElementRenderer) : this()
{
if (visualElementRenderer != null)
SetupRenderer(visualElementRenderer);
}
public void SetupRenderer(IVisualElementRenderer visualElementRenderer)
{
VisualElementRenderer = visualElementRenderer;
VisualElementRenderer.ElementChanged += OnElementChanged;
if (VisualElementRenderer.Element is IView view)
{
view.Handler = this;
SetVirtualView(view);
}
else if (VisualElementRenderer.Element != null)
throw new Exception($"{VisualElementRenderer.Element} must implement: {nameof(IView)}");
}
void OnElementChanged(object sender, VisualElementChangedEventArgs e)
{
if (e.OldElement is IView view)
view.Handler = null;
if (e.NewElement is IView newView)
{
newView.Handler = this;
this.SetVirtualView(newView);
}
else if (e.NewElement != null)
throw new Exception($"{e.NewElement} must implement: {nameof(IView)}");
}
protected override UIView CreateNativeView()
{
return VisualElementRenderer.NativeView;
}
protected override void ConnectHandler(UIView nativeView)
{
base.ConnectHandler(nativeView);
VirtualView.Handler = this;
}
protected override void DisconnectHandler(UIView nativeView)
{
Platform.iOS.Platform.SetRenderer(
VisualElementRenderer.Element,
VisualElementRenderer);
VisualElementRenderer.SetElement(null);
base.DisconnectHandler(nativeView);
VirtualView.Handler = null;
}
public override void SetVirtualView(IView view)
{
if (VisualElementRenderer == null)
{
var renderer = Controls.Internals.Registrar.Registered.GetHandlerForObject<IVisualElementRenderer>(view)
?? new Microsoft.Maui.Controls.Compatibility.Platform.iOS.Platform.DefaultRenderer();
SetupRenderer(renderer);
}
if (VisualElementRenderer.Element != view)
{
VisualElementRenderer.SetElement((VisualElement)view);
}
else
{
base.SetVirtualView(view);
}
Platform.iOS.Platform.SetRenderer(
VisualElementRenderer.Element,
VisualElementRenderer);
}
public override void UpdateValue(string property)
{
base.UpdateValue(property);
if (property == "Frame")
{
SetFrame(VisualElementRenderer.Element.Bounds);
}
}
}
}