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LayoutHandler.Tizen.cs
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LayoutHandler.Tizen.cs
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using System;
using ElmSharp;
namespace Microsoft.Maui.Handlers
{
public partial class LayoutHandler : ViewHandler<ILayout, LayoutCanvas>
{
public override bool NeedsContainer =>
VirtualView?.Background != null ||
VirtualView?.Clip != null ||
base.NeedsContainer;
public static void MapBackground(LayoutHandler handler, ILayout layout)
{
handler.UpdateValue(nameof(IViewHandler.ContainerView));
handler.WrappedNativeView?.UpdateBackground(layout);
}
protected override LayoutCanvas CreateNativeView()
{
if (VirtualView == null)
{
throw new InvalidOperationException($"{nameof(VirtualView)} must be set to create a Canvas");
}
if (NativeParent == null)
{
throw new InvalidOperationException($"{nameof(NativeParent)} cannot be null");
}
var view = new LayoutCanvas(NativeParent, VirtualView)
{
CrossPlatformMeasure = VirtualView.LayoutManager.Measure,
CrossPlatformArrange = VirtualView.LayoutManager.ArrangeChildren
};
view.Show();
return view;
}
public override Graphics.Size GetDesiredSize(double widthConstraint, double heightConstraint)
{
return VirtualView.LayoutManager.Measure(widthConstraint, heightConstraint);
}
public override void SetVirtualView(IView view)
{
base.SetVirtualView(view);
_ = NativeView ?? throw new InvalidOperationException($"{nameof(NativeView)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
NativeView.CrossPlatformMeasure = VirtualView.LayoutManager.Measure;
NativeView.CrossPlatformArrange = VirtualView.LayoutManager.ArrangeChildren;
NativeView.Children.Clear();
foreach (var child in VirtualView)
{
NativeView.Children.Add(child.ToNative(MauiContext));
if (child.Handler is INativeViewHandler thandler)
{
thandler?.SetParent(this);
}
}
}
public void Add(IView child)
{
_ = NativeView ?? throw new InvalidOperationException($"{nameof(NativeView)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
NativeView.Children.Add(child.ToNative(MauiContext));
if (child.Handler is INativeViewHandler childHandler)
{
childHandler?.SetParent(this);
}
}
public void Remove(IView child)
{
_ = NativeView ?? throw new InvalidOperationException($"{nameof(NativeView)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
if (child.Handler is INativeViewHandler thandler && thandler.NativeView is EvasObject childView)
{
NativeView.Children.Remove(childView);
thandler.Dispose();
}
}
public void Clear()
{
NativeView?.Clear();
}
public void Insert(int index, IView child)
{
_ = NativeView ?? throw new InvalidOperationException($"{nameof(NativeView)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
NativeView.Children.Insert(index, child.ToNative(MauiContext));
if (child.Handler is INativeViewHandler childHandler)
{
childHandler?.SetParent(this);
}
}
public void Update(int index, IView child)
{
_ = NativeView ?? throw new InvalidOperationException($"{nameof(NativeView)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
NativeView.Children.RemoveAt(index);
NativeView.Children.Insert(index, child.ToNative(MauiContext));
if (child.Handler is INativeViewHandler childHandler)
{
childHandler?.SetParent(this);
}
}
}
}