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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 );
this.UpdateTextFromDocument();
}
private void UpdateTextFromDocument()
{
if( _preventTextUpdate )
return;
_preventDocumentUpdate = true;
#if VS2008
Text = this.TextFormatter.GetText( this.Document );
#else
this.SetCurrentValue( RichTextBox.TextProperty, this.TextFormatter.GetText( this.Document ) );
#endif
_preventDocumentUpdate = false;
}
private void UpdateDocumentFromText()
{
if( _preventDocumentUpdate )
return;
_preventTextUpdate = true;
this.TextFormatter.SetText( this.Document, Text );
_preventTextUpdate = false;
}
/// <summary>
/// Clears the content of the RichTextBox.
/// </summary>
public void Clear()
{
this.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 ) )
{
this.UpdateDocumentFromText();
}
else
{
this.UpdateTextFromDocument();
}
}
#endregion //Methods
}
}
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