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// Lluis Sanchez <lluis@xamarin.com>
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// Copyright (c) 2011 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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public abstract class XwtObject: IFrontend
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protected XwtObject (object backend)
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this.backend = backend;
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protected XwtObject ()
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protected abstract IBackendHandler BackendHandler { get; }
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protected object Backend {
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object IFrontend.Backend {
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get { return Backend; }
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protected void LoadBackend ()
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if (backend == null) {
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backend = OnCreateBackend ();
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throw new InvalidOperationException ("No backend found for widget: " + GetType ());
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protected virtual void OnBackendCreated ()
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protected virtual object OnCreateBackend ()
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throw new NotImplementedException ();
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internal static object GetBackend (XwtObject w)
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return w != null ? w.Backend : null;