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Viewing changes to external/xwt/Xwt/Xwt.Backends/BackendHost.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/xwt/Xwt/Xwt.Backends/BackendHost.cs
 
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// 
 
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// BackendHost.cs
 
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//  
 
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// Author:
 
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//       Lluis Sanchez <lluis@xamarin.com>
 
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// 
 
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// Copyright (c) 2012 Xamarin Inc
 
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// 
 
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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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// 
 
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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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// 
 
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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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// THE SOFTWARE.
 
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using System;
 
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using System.Collections.Generic;
 
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using Xwt.Engine;
 
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namespace Xwt.Backends
 
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{
 
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        public class BackendHost<T,B>: BackendHost where B:IBackend
 
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        {
 
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                public BackendHost ()
 
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                {
 
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                }
 
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                public new T Parent {
 
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                        get { return (T)base.Parent; }
 
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                        set { base.Parent = value; }
 
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                }
 
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                public new B Backend {
 
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                        get { return (B)base.Backend; }
 
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                }
 
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        }
 
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        public class BackendHost
 
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        {
 
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                IBackend backend;
 
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                bool usingCustomBackend;
 
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                HashSet<object> defaultEnabledEvents;
 
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                public BackendHost ()
 
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                {
 
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                }
 
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                public void SetCustomBackend (IBackend backend)
 
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                {
 
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                        this.backend = backend;
 
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                        usingCustomBackend = true;
 
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                }
 
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                public object Parent { get; internal set; }
 
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                public IBackend Backend {
 
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                        get {
 
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                                LoadBackend ();
 
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                                return backend;
 
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                        }
 
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                }
 
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                internal bool BackendCreated {
 
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                        get { return backend != null; }
 
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                }
 
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                protected virtual void OnBackendCreated ()
 
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                {
 
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                        foreach (var ev in DefaultEnabledEvents)
 
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                                Backend.EnableEvent (ev);
 
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                }
 
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                protected virtual IBackend OnCreateBackend ()
 
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                {
 
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                        Type t = Parent.GetType ();
 
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                        while (t != typeof(object)) {
 
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                                IBackend b = WidgetRegistry.CreateBackend<IBackend> (t);
 
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                                if (b != null)
 
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                                        return b;
 
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                                t = t.BaseType;
 
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                        }
 
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                        return null;
 
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                }
 
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                public void EnsureBackendLoaded ()
 
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                {
 
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                        if (backend == null)
 
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                                LoadBackend ();
 
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                }
 
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                protected void LoadBackend ()
 
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                {
 
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                        if (usingCustomBackend) {
 
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                                usingCustomBackend = false;
 
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                                backend.InitializeBackend (Parent);
 
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                                OnBackendCreated ();
 
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                        }
 
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                        else if (backend == null) {
 
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                                backend = OnCreateBackend ();
 
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                                if (backend == null)
 
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                                        throw new InvalidOperationException ("No backend found for object: " + Parent.GetType ());
 
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                                backend.InitializeBackend (Parent);
 
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                                OnBackendCreated ();
 
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                        }
 
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                }
 
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                public void OnBeforeEventAdd (object eventId, Delegate eventDelegate)
 
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                {
 
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                        if (eventDelegate == null && !DefaultEnabledEvents.Contains (eventId))
 
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                                Backend.EnableEvent (eventId);
 
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                }
 
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                public void OnAfterEventRemove (object eventId, Delegate eventDelegate)
 
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                {
 
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                        if (eventDelegate != null && !DefaultEnabledEvents.Contains (eventId))
 
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                                Backend.DisableEvent (eventId);
 
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                }
 
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                internal HashSet<object> DefaultEnabledEvents {
 
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                        get {
 
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                                if (defaultEnabledEvents == null)
 
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                                        defaultEnabledEvents = EventUtil.GetDefaultEnabledEvents (Parent.GetType ());
 
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                                return defaultEnabledEvents;
 
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                        }
 
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                }       
 
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        }
 
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}
 
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