Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / GeometryDrawing.cs / 1 / GeometryDrawing.cs
//---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: GeometryDrawing represents a drawing operation that combines // a geometry with and brush and/or pen to produce rendered // content. // // History: // // 2004/11/17 : [....] - Created it. // //--------------------------------------------------------------------------- using System.Diagnostics; namespace System.Windows.Media { ////// GeometryDrawing represents a drawing operation that combines /// a geometry with and brush and/or pen to produce rendered /// content. /// public sealed partial class GeometryDrawing : Drawing { #region Constructors ////// Default GeometryDrawing constructor. /// Constructs an object with all properties set to their default values /// public GeometryDrawing() { } ////// Three-argument GeometryDrawing constructor. /// Constructs an object with the Brush, Pen, and Geometry properties /// set to the value of their respective arguments. /// public GeometryDrawing(Brush brush, Pen pen, Geometry geometry) { Brush = brush; Pen = pen; Geometry = geometry; } #endregion #region Internal methods ////// Calls methods on the DrawingContext that are equivalent to the /// Drawing with the Drawing's current value. /// internal override void WalkCurrentValue(DrawingContextWalker ctx) { // We avoid unneccessary ShouldStopWalking checks based on assumptions // about when ShouldStopWalking is set. Guard that assumption with an // assertion. See DrawingGroup.WalkCurrentValue comment for more details. Debug.Assert(!ctx.ShouldStopWalking); ctx.DrawGeometry( Brush, Pen, Geometry ); } ////// PrecomputeCore /// /// Currently this method checks if the geometry drawing requires realization updates. /// Realization updates are needed if the fill/stroke brush contain drawings or if the /// fill/stroke brush are VisualBrushes. /// internal override void PrecomputeCore() { RequiresRealizationUpdates = false; if (Geometry != null) { Brush fillBrush = Brush; Pen pen = Pen; Brush strokeBrush = (pen != null) ? pen.Brush : null; if (fillBrush != null) { fillBrush.Precompute(); RequiresRealizationUpdates |= fillBrush.RequiresRealizationUpdates; } if (strokeBrush != null) { strokeBrush.Precompute(); RequiresRealizationUpdates |= strokeBrush.RequiresRealizationUpdates; } } } ////// Pushes updates into the geometries fill brush or stroke brush if necessary. /// internal override void UpdateRealizations(RealizationContext realizationContext) { Debug.Assert(realizationContext != null); if (RequiresRealizationUpdates) { Debug.Assert(Geometry != null, "RequiresRealizationUpdates is true if Geometry != null."); Brush fillBrush = Brush; Pen pen = Pen; Brush strokeBrush = (pen != null) ? pen.Brush : null; // The bounding box of the geometry can affect at one scale resolutions have to be created. // (E.g. StretchMode.Fill). Rect bounds = Geometry.GetBoundsInternal(null, Matrix.Identity); if (fillBrush != null) { fillBrush.UpdateRealizations(bounds, realizationContext); } if (strokeBrush != null) { strokeBrush.UpdateRealizations(bounds, realizationContext); } } } #endregion Internal methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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