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// CustomWidgetBackend.cs
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// Eric Maupin <ermau@xamarin.com>
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// Copyright (c) 2012 Xamarin, Inc.
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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using System.Windows.Controls;
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using SW = System.Windows;
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namespace Xwt.WPFBackend
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public class CustomWidgetBackend
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: WidgetBackend, ICustomWidgetBackend
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public CustomWidgetBackend()
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Widget = new ExUserControl ();
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public void SetContent (IWidgetBackend widget)
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child = (Widget)((WidgetBackend)widget).Frontend;
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UserControl.Content = widget.NativeWidget;
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UserControl.Content = null;
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protected UserControl UserControl
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get { return (UserControl) Widget; }
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// The size of the container is the size of the child,
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// so we redirect size calculations to the child.
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public override WidgetSize GetPreferredWidth ()
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return child != null ? child.Surface.GetPreferredWidth () : new WidgetSize (0);
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public override WidgetSize GetPreferredHeightForWidth (double width)
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return child != null ? child.Surface.GetPreferredHeightForWidth (width) : new WidgetSize (0);
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public override WidgetSize GetPreferredHeight ()
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return child != null ? child.Surface.GetPreferredHeight () : new WidgetSize (0);
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public override WidgetSize GetPreferredWidthForHeight (double width)
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return child != null ? child.Surface.GetPreferredWidthForHeight (width) : new WidgetSize (0);
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class ExUserControl : UserControl, IWpfWidget
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public WidgetBackend Backend
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protected override SW.Size MeasureOverride (SW.Size constraint)
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var s = base.MeasureOverride (constraint);
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return Backend.MeasureOverride (constraint, s);
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