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Viewing changes to src/AddIns/Misc/SearchAndReplace/Project/Gui/SearchNode.cs

  • Committer: sk
  • Date: 2011-09-10 05:17:57 UTC
  • Revision ID: halega@halega.com-20110910051757-qfouz1llya9m6boy
4.1.0.7915 Release Candidate 1

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src/AddIns/Misc/SearchAndReplace/Project/Gui/SearchNode.cs
 
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
 
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
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using System;
 
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using System.Collections.Generic;
 
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using System.ComponentModel;
 
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using System.Windows.Controls;
 
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using System.Windows.Media;
 
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namespace SearchAndReplace
 
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{
 
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        abstract class SearchNode : INotifyPropertyChanged
 
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        {
 
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                bool isExpanded;
 
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                public bool IsExpanded {
 
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                        get { return isExpanded; }
 
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                        set {
 
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                                if (isExpanded != value) {
 
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                                        isExpanded = value;
 
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                                        OnPropertyChanged("IsExpanded");
 
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                                }
 
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                        }
 
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                }
 
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                IEnumerable<SearchNode> children;
 
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                public IEnumerable<SearchNode> Children {
 
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                        get { return children; }
 
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                        set {
 
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                                if (children != value) {
 
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                                        children = value;
 
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                                        OnPropertyChanged("Children");
 
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                                }
 
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                        }
 
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                }
 
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                // Text usually is a TextBlock object, so we don't want too many of them floating in memory
 
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                // (remember, we have a SearchNode for each search result, even for those in the search history).
 
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                // We don't want to create a new TextBlock for each property access, either; so we'll cache them
 
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                // using a WeakReference.
 
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                WeakReference cachedText;
 
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                public object Text {
 
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                        get {
 
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                                object text;
 
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                                if (cachedText != null) {
 
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                                        text = cachedText.Target;
 
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                                        if (text != null)
 
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                                                return text;
 
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                                }
 
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                                text = CreateText() ?? string.Empty;
 
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                                cachedText = new WeakReference(text);
 
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                                return text;
 
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                        }
 
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                }
 
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                protected abstract object CreateText();
 
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                protected void InvalidateText()
 
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                {
 
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                        cachedText = null;
 
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                        OnPropertyChanged("Text");
 
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                }
 
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                public event PropertyChangedEventHandler PropertyChanged;
 
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                protected virtual void OnPropertyChanged(string propertyName)
 
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                {
 
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                        if (PropertyChanged != null) {
 
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                                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
 
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                        }
 
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                }
 
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                public virtual void ActivateItem()
 
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                {
 
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                }
 
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        }
 
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}