Init

Src/Xceed.Wpf.Toolkit/RichTextBox/RichTextBox.cs

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+/*************************************************************************************
+
+   Extended WPF Toolkit
+
+   Copyright (C) 2007-2013 Xceed Software Inc.
+
+   This program is provided to you under the terms of the Microsoft Public
+   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 
+
+   For more features, controls, and fast professional support,
+   pick up the Plus Edition at http://xceed.com/wpf_toolkit
+
+   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
+
+  ***********************************************************************************/
+
+using System;
+using System.Windows;
+using System.Windows.Data;
+using System.Windows.Threading;
+
+namespace Xceed.Wpf.Toolkit
+{
+  public class RichTextBox : System.Windows.Controls.RichTextBox
+  {
+    #region Private Members
+
+    private bool _preventDocumentUpdate;
+    private bool _preventTextUpdate;
+
+    #endregion //Private Members
+
+    #region Constructors
+
+    public RichTextBox()
+    {
+    }
+
+    public RichTextBox( System.Windows.Documents.FlowDocument document )
+      : base( document )
+    {
+
+    }
+
+    #endregion //Constructors
+
+    #region Properties
+
+    #region Text
+
+    public static readonly DependencyProperty TextProperty = DependencyProperty.Register( "Text", typeof( string ), typeof( RichTextBox ), new FrameworkPropertyMetadata( String.Empty, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnTextPropertyChanged, CoerceTextProperty, true, UpdateSourceTrigger.LostFocus ) );
+    public string Text
+    {
+      get
+      {
+        return ( string )GetValue( TextProperty );
+      }
+      set
+      {
+        SetValue( TextProperty, value );
+      }
+    }
+
+    private static void OnTextPropertyChanged( DependencyObject d, DependencyPropertyChangedEventArgs e )
+    {
+      ( ( RichTextBox )d ).UpdateDocumentFromText();
+    }
+
+    private static object CoerceTextProperty( DependencyObject d, object value )
+    {
+      return value ?? "";
+    }
+
+    #endregion //Text
+
+    #region TextFormatter
+
+    public static readonly DependencyProperty TextFormatterProperty = DependencyProperty.Register( "TextFormatter", typeof( ITextFormatter ), typeof( RichTextBox ), new FrameworkPropertyMetadata( new RtfFormatter(), OnTextFormatterPropertyChanged ) );
+    public ITextFormatter TextFormatter
+    {
+      get
+      {
+        return ( ITextFormatter )GetValue( TextFormatterProperty );
+      }
+      set
+      {
+        SetValue( TextFormatterProperty, value );
+      }
+    }
+
+    private static void OnTextFormatterPropertyChanged( DependencyObject d, DependencyPropertyChangedEventArgs e )
+    {
+      RichTextBox richTextBox = d as RichTextBox;
+      if( richTextBox != null )
+        richTextBox.OnTextFormatterPropertyChanged( ( ITextFormatter )e.OldValue, ( ITextFormatter )e.NewValue );
+    }
+
+    protected virtual void OnTextFormatterPropertyChanged( ITextFormatter oldValue, ITextFormatter newValue )
+    {
+      this.UpdateTextFromDocument();
+    }
+
+    #endregion //TextFormatter
+
+    #endregion //Properties
+
+    #region Methods
+
+    protected override void OnTextChanged( System.Windows.Controls.TextChangedEventArgs e )
+    {
+      base.OnTextChanged( e );
+      UpdateTextFromDocument();
+    }
+
+    private void UpdateTextFromDocument()
+    {
+      if( _preventTextUpdate )
+        return;
+
+      _preventDocumentUpdate = true;
+      Text = TextFormatter.GetText( Document );
+      _preventDocumentUpdate = false;
+    }
+
+    private void UpdateDocumentFromText()
+    {
+      if( _preventDocumentUpdate )
+        return;
+
+      _preventTextUpdate = true;
+      TextFormatter.SetText( Document, Text );
+      _preventTextUpdate = false;
+    }
+
+    /// <summary>
+    /// Clears the content of the RichTextBox.
+    /// </summary>
+    public void Clear()
+    {
+      Document.Blocks.Clear();
+    }
+
+    public override void BeginInit()
+    {
+      base.BeginInit();
+      // Do not update anything while initializing. See EndInit
+      _preventTextUpdate = true;
+      _preventDocumentUpdate = true;
+    }
+
+    public override void EndInit()
+    {
+      base.EndInit();
+      _preventTextUpdate = false;
+      _preventDocumentUpdate = false;
+      // Possible conflict here if the user specifies 
+      // the document AND the text at the same time 
+      // in XAML. Text has priority.
+      if( !string.IsNullOrEmpty( Text ) )
+        UpdateDocumentFromText();
+      else
+        UpdateTextFromDocument();
+    }
+
+    #endregion //Methods
+  }
+}