Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / DrawingImage.cs / 1 / DrawingImage.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: DrawingImage class // An ImageSource with a Drawing for content // // // History: // 05/26/2005 : [....] - Created it // //--------------------------------------------------------------------------- using MS.Internal; using System; using System.ComponentModel; using System.Diagnostics; using System.Runtime.InteropServices; using System.Windows; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Media.Composition; using System.Windows.Media.Imaging; namespace System.Windows.Media { ////// The class definition for DrawingImage /// public sealed partial class DrawingImage : ImageSource { ////// Default DrawingImage ctor /// public DrawingImage() { } ////// DrawingImage ctor that takes a Drawing /// /// The content of the DrawingImage public DrawingImage(Drawing drawing) { Drawing = drawing; } ////// Width of the DrawingImage /// public override double Width { get { ReadPreamble(); return Size.Width; } } ////// Height of the DrawingImage /// public override double Height { get { ReadPreamble(); return Size.Height; } } ////// Get the Metadata of the DrawingImage /// public override ImageMetadata Metadata { get { ReadPreamble(); // DrawingImage does not have any metadata currently defined. return null; } } ////// Size for the DrawingImage /// internal override Size Size { get { Drawing drawing = Drawing; if (drawing != null) { Size size = drawing.GetBounds().Size; if (!size.IsEmpty) { return size; } else { return new Size(); } } else { return new Size(); } } } ////// Precompute is called during the frame preparation phase. Derived classes /// typically check if the brush requires realizations during this phase. /// internal override void Precompute() { Drawing drawing = Drawing; _requiresRealizationUpdates = false; if (drawing != null) { drawing.PrecomputeCore(); _requiresRealizationUpdates = drawing.RequiresRealizationUpdates; } } ////// Checks if realization updates are requried for this resource. /// internal override bool RequiresRealizationUpdates { get { return _requiresRealizationUpdates; } } ////// Derived classes must override this method and update realizations on dependent /// resources if required. /// internal override void UpdateRealizations(RealizationContext ctx) { if (_requiresRealizationUpdates) { Drawing drawing = Drawing; Debug.Assert(drawing != null); // Otherwise _requiresRealizationUpdates would be false. drawing.UpdateRealizations(ctx); } } ////// This node can introduce graphness /// internal override bool CanIntroduceGraphness() { return true; } private bool _requiresRealizationUpdates; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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