Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Ink / DrawingAttributesDefaultValueFactory.cs / 1305600 / DrawingAttributesDefaultValueFactory.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: DefaultValueFactory for DrawingAttributes // // History: // 2005/11/08 : [....] - Created // //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using System.Windows.Controls; using System.Windows.Ink; namespace MS.Internal.Ink { internal class DrawingAttributesDefaultValueFactory : DefaultValueFactory { internal DrawingAttributesDefaultValueFactory() { } ////// Returns an "immutable" default value. Since we can't make the default value /// read only we'll return a new one every time. /// internal override object DefaultValue { get { return new DrawingAttributes(); } } ////// Creates a mutable default value /// internal override object CreateDefaultValue(DependencyObject owner, DependencyProperty property) { // Instantiate our default value instance. DrawingAttributes defaultValue = new DrawingAttributes(); // Add event handlers for tracking the changes on the default value instance. DrawingAttributesDefaultPromoter promoter = new DrawingAttributesDefaultPromoter((InkCanvas)owner); defaultValue.AttributeChanged += new PropertyDataChangedEventHandler(promoter.OnDrawingAttributesChanged); defaultValue.PropertyDataChanged += new PropertyDataChangedEventHandler(promoter.OnDrawingAttributesChanged); return defaultValue; } ////// A tracking class which monitors the sub-property changes on DrawingAttributes /// private class DrawingAttributesDefaultPromoter { ////// Constructor /// /// internal DrawingAttributesDefaultPromoter(InkCanvas owner) { _owner = owner; } ////// A handler for both AttributeChanged and PropertyDataChanged. /// /// /// internal void OnDrawingAttributesChanged(object sender, PropertyDataChangedEventArgs e) { DrawingAttributes value = (DrawingAttributes)sender; // The current instance will be promoted to the local value other than the default value. // Then we could just remove our handlers to stop tracking. value.AttributeChanged -= new PropertyDataChangedEventHandler(OnDrawingAttributesChanged); value.PropertyDataChanged -= new PropertyDataChangedEventHandler(OnDrawingAttributesChanged); // NTRAID#WINDOWS-1334059-2005/10/17-waynezen, // We only promote the value when there is no local value set yet. if (_owner.ReadLocalValue(InkCanvas.DefaultDrawingAttributesProperty) == DependencyProperty.UnsetValue) { // Promote the instance to the local value. _owner.SetValue(InkCanvas.DefaultDrawingAttributesProperty, value); } // Remove this value from the DefaultValue cache so we stop // handing it out as the default value now that it has changed. PropertyMetadata metadata = InkCanvas.DefaultDrawingAttributesProperty.GetMetadata(_owner.DependencyObjectType); metadata.ClearCachedDefaultValue(_owner, InkCanvas.DefaultDrawingAttributesProperty); } private readonly InkCanvas _owner; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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