Drawing.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Drawing.cs / 1 / Drawing.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
// Description: Drawing is the base Drawing class that defines the standard 
//              interface which Drawing's must implement.
// 
// History: 
//  2003/07/16 : [....] - Created it.
//  2003/07/28 : [....] - Renamed it and hooked it up to the unmanaged code. 
//  2004/11/17 : [....] - Repurposed Drawing from being a Changeable
//               implementation that contains render data into the base
//               class for the enumerable & modifiable Drawing subclasses.
//  2005/01/26 : [....] - Made Drawing abstract & removed legacy Drawing 
//               support, including .Open() & IAddChild.
// 
//--------------------------------------------------------------------------- 

using MS.Internal; 
using System;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics; 
using System.Resources;
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Media.Composition;
using System.Windows.Markup; 
using System.Windows.Threading;

namespace System.Windows.Media
{ 
    /// 
    /// Base class for the enumerable and modifiable Drawing subclasses. 
    ///  
    [Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)]
    public abstract partial class Drawing : Animatable, IDrawingContent, DUCE.IResource 
    {
        #region Constructors

        ///  
        /// Constructor for Drawing
        ///  
        ///  
        /// This constructor is internal to prevent external subclassing.
        ///  
        internal Drawing()
        {
        }
 
        #endregion Constructors
 
        #region Public Properties 

        ///  
        /// Bounds - the axis-aligned bounds of this Drawing.
        /// 
        /// 
        /// Rect - the axis-aligned bounds of this Drawing. 
        /// 
        public Rect Bounds 
        { 
            get
            { 
                ReadPreamble();

                return GetBounds();
            } 
        }
 
        #endregion Public Properties 

        #region Internal Methods 

        /// 
        /// This node can introduce graphness
        ///  
        internal override bool CanIntroduceGraphness()
        { 
            return true; 
        }
 
        /// 
        /// Called when an object needs to Update it's realizations.
        /// Currently, GlyphRun is the only MIL object that needs realization
        /// updates. 
        /// 
        internal abstract void UpdateRealizations(RealizationContext realizationContext); 
 
        /// 
        /// Calls methods on the DrawingContext that are equivalent to the 
        /// Drawing with the Drawing's current value.
        /// 
        internal abstract void WalkCurrentValue(DrawingContextWalker ctx);
 
        #endregion Internal Methods
 
        #region IDrawingContent implementation 
        void IDrawingContent.PrecomputeContent()
        { 
            PrecomputeCore();
        }

        bool IDrawingContent.ContentRequiresRealizationUpdates 
        {
            get { return this.RequiresRealizationUpdates; } 
        } 

 
        /// 
        /// True if this content can introduce graphness
        /// 
        bool IDrawingContent.ContentIntroducesGraphness 
        {
            get 
            { 
                return CanIntroduceGraphness();
            } 
        }

        #endregion IDrawingContent implementation
 

        ///  
        /// Precompute updates cached data on the Drawings. Currently it is only caching the 
        /// realization flag.
        ///  
        internal override void Precompute()
        {
            PrecomputeCore();
        } 

        ///  
        /// Derived classes implement the caching of the RequiresRealizationUpdates flag 
        /// in this method.
        ///  
        /// 
        ///

 

 
 
        internal abstract void PrecomputeCore();
 
        /// 
        /// True if and only if the Drawing requires realization updates.
        /// 
        internal override bool RequiresRealizationUpdates 
        {
            get { return m_requiresRealizationUpdates; } 
            set { m_requiresRealizationUpdates = value; } 
        }
 
        /// 
        /// Returns the bounding box occupied by the content
        /// 
        ///  
        /// Bounding box occupied by the content
        ///  
        Rect IDrawingContent.GetContentBounds(BoundsDrawingContextWalker ctx) 
        {
            Debug.Assert(ctx != null); 

            WalkCurrentValue(ctx);

            return ctx.Bounds; 
        }
 
        ///  
        /// Forward the current value of the content to the DrawingContextWalker
        /// methods. 
        /// 
        ///  DrawingContextWalker to forward content to. 
        void IDrawingContent.WalkContent(DrawingContextWalker ctx)
        { 
            ((Drawing)this).WalkCurrentValue(ctx);
        } 
 
        /// 
        /// Determines whether or not a point exists within the content 
        /// 
        ///  Point to hit-test for. 
        /// 
        /// 'true' if the point exists within the content, 'false' otherwise 
        /// 
        bool IDrawingContent.HitTestPoint(Point point) 
        { 
            return DrawingServices.HitTestPoint(this, point);
        } 

        /// 
        /// Hit-tests a geometry against this content
        ///  
        ///  PathGeometry to hit-test for. 
        ///  
        /// IntersectionDetail describing the result of the hit-test 
        /// 
        IntersectionDetail IDrawingContent.HitTestGeometry(PathGeometry geometry) 
        {
            return DrawingServices.HitTestGeometry(this, geometry);
        }
 
        /// 
        /// Propagates an event handler to Freezables referenced by 
        /// the content. 
        /// 
        ///  Event handler to propagate  
        ///  'true' to add the handler, 'false' to remove it 
        void IDrawingContent.PropagateChangedHandler(EventHandler handler, bool adding)
        {
            if (!IsFrozen) 
            {
                if (adding) 
                { 
                    ((Drawing)this).Changed += handler;
                } 
                else
                {
                    ((Drawing)this).Changed -= handler;
                } 
            }
        } 
 
        /// 
        /// Calls UpdatesRealization on GlyphRun's referenced by the content 
        /// 
        ///  Context to create realization updates for 
        void IDrawingContent.UpdateRealizations(RealizationContext realizationContext)
        { 
            ((Drawing)this).UpdateRealizations(realizationContext);
        } 
 

        ///  
        /// GetBounds to calculate the bounds of this drawing.
        /// 
        internal Rect GetBounds()
        { 
            BoundsDrawingContextWalker ctx = new BoundsDrawingContextWalker();
 
            WalkCurrentValue(ctx); 

            return ctx.Bounds; 
        }

        //
        private bool m_requiresRealizationUpdates; 

    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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Drawing.cs source code in C# .NET

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