зеркало из https://github.com/DeGsoft/maui-linux.git
88 строки
2.2 KiB
C#
88 строки
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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namespace Xamarin.Forms.Platform.Android
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{
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public sealed class RendererPool
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{
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readonly Dictionary<Type, Stack<IVisualElementRenderer>> _freeRenderers = new Dictionary<Type, Stack<IVisualElementRenderer>>();
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readonly VisualElement _oldElement;
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readonly IVisualElementRenderer _parent;
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public RendererPool(IVisualElementRenderer renderer, VisualElement oldElement)
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{
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if (renderer == null)
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throw new ArgumentNullException("renderer");
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if (oldElement == null)
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throw new ArgumentNullException("oldElement");
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_oldElement = oldElement;
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_parent = renderer;
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}
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public void ClearChildrenRenderers()
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{
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if (((IElementController)_parent.Element).LogicalChildren.Count == 0)
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return;
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ClearChildrenRenderers(_oldElement);
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}
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public IVisualElementRenderer GetFreeRenderer(VisualElement view)
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{
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if (view == null)
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throw new ArgumentNullException("view");
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Type rendererType = Registrar.Registered.GetHandlerType(view.GetType()) ?? typeof(ViewRenderer);
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Stack<IVisualElementRenderer> renderers;
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if (!_freeRenderers.TryGetValue(rendererType, out renderers) || renderers.Count == 0)
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return null;
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IVisualElementRenderer renderer = renderers.Pop();
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renderer.SetElement(view);
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return renderer;
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}
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void ClearChildrenRenderers(VisualElement view)
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{
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if (view == null)
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return;
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foreach (Element logicalChild in ((IElementController)view).LogicalChildren)
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{
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var child = logicalChild as VisualElement;
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if (child != null)
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{
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IVisualElementRenderer renderer = Platform.GetRenderer(child);
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if (renderer == null)
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continue;
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if (renderer.ViewGroup.Parent != _parent.ViewGroup)
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continue;
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renderer.ViewGroup.RemoveFromParent();
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Platform.SetRenderer(child, null);
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PushRenderer(renderer);
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}
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}
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if (_parent.ViewGroup.ChildCount != 0)
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_parent.ViewGroup.RemoveAllViews();
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}
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void PushRenderer(IVisualElementRenderer renderer)
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{
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Type rendererType = renderer.GetType();
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Stack<IVisualElementRenderer> renderers;
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if (!_freeRenderers.TryGetValue(rendererType, out renderers))
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_freeRenderers[rendererType] = renderers = new Stack<IVisualElementRenderer>();
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renderers.Push(renderer);
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}
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}
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} |