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Viewing changes to external/xwt/Xwt/Xwt/TreeNavigator.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/TreeNavigator.cs
 
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// 
 
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// TreeNavigator.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) 2011 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 Xwt.Drawing;
 
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using System.Collections.ObjectModel;
 
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using System.Collections.Generic;
 
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using Xwt.Backends;
 
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namespace Xwt
 
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{
 
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        public struct NodePosition
 
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        {
 
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                internal TreePosition ParentPos;
 
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                internal int Index;
 
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        }
 
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        public class TreeNavigator
 
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        {
 
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                ITreeStoreBackend backend;
 
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                TreePosition pos;
 
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                internal TreeNavigator (ITreeStoreBackend backend, TreePosition pos)
 
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                {
 
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                        this.backend = backend;
 
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                        this.pos = pos;
 
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                }
 
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                public TreePosition CurrentPosition {
 
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                        get { return pos; }
 
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                }
 
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                public TreeNavigator Clone ()
 
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                {
 
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                        return new TreeNavigator (backend, pos);
 
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                }
 
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                bool CommitPos (TreePosition newPosition)
 
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                {
 
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                        if (newPosition != null) {
 
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                                pos = newPosition;
 
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                                return true;
 
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                        }
 
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                        else
 
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                                return false;
 
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                }
 
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                public bool MoveToFirst ()
 
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                {
 
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                        return CommitPos (backend.GetChild (null, 0));
 
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                }
 
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                public bool MoveNext ()
 
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                {
 
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                        return CommitPos (backend.GetNext (pos));
 
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                }
 
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                public bool MovePrevious ()
 
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                {
 
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                        return CommitPos (backend.GetPrevious (pos));
 
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                }
 
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                public bool MoveToChild ()
 
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                {
 
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                        return CommitPos (backend.GetChild (pos, 0));
 
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                }
 
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                public bool MoveToParent ()
 
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                {
 
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                        return CommitPos (backend.GetParent (pos));
 
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                }
 
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                public TreeNavigator InsertBefore ()
 
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                {
 
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                        pos = backend.InsertBefore (pos);
 
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                        return this;
 
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                }
 
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                public TreeNavigator InsertAfter ()
 
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                {
 
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                        pos = backend.InsertAfter (pos);
 
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                        return this;
 
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                }
 
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                public TreeNavigator AddChild ()
 
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                {
 
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                        pos = backend.AddChild (pos);
 
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                        return this;
 
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                }
 
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                public TreeNavigator SetValue<T> (DataField<T> field, T data)
 
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                {
 
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                        backend.SetValue (pos, field.Index, data);
 
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                        return this;
 
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                }
 
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                public T GetValue<T> (DataField<T> field)
 
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                {
 
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                        return (T) backend.GetValue (pos, field.Index);
 
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                }
 
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                public void Remove ()
 
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                {
 
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                        backend.Remove (pos);
 
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                }
 
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                public void RemoveChildren ()
 
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                {
 
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                        TreePosition child = backend.GetChild (pos, 0);
 
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                        while (child != null) {
 
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                                backend.Remove (child);
 
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                                child = backend.GetChild (pos, 0);
 
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                        }
 
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                }
 
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        }
 
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}