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//---------------------------------------------------------------------------
//
// File: DeferredTextReference.cs
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
// Description: Proxy object passed to the property system to delay load
// TextProperty values.
//
//---------------------------------------------------------------------------
namespace System.Windows.Controls
{
using System.Windows.Documents;
// Proxy object passed to the property system to delay load TextProperty
// values.
internal class DeferredTextReference : DeferredReference
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
internal DeferredTextReference(ITextContainer textContainer)
{
_textContainer = textContainer;
}
#endregion Constructors
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
// Does the real work to calculate the current TextProperty value.
internal override object GetValue(BaseValueSourceInternal valueSource)
{
string s = TextRangeBase.GetTextInternal(_textContainer.Start, _textContainer.End);
TextBox tb = _textContainer.Parent as TextBox;
if (tb != null)
{
tb.OnDeferredTextReferenceResolved(this, s);
}
return s;
}
// Gets the type of the value it represents
internal override Type GetValueType()
{
return typeof(string);
}
#endregion Internal Methods
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
// TextContainer mapped to this object.
private readonly ITextContainer _textContainer;
#endregion Private Fields
}
}
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