Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / ImageBrush.cs / 1 / ImageBrush.cs
//---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: This file contains the implementation of ImageBrush. // The ImageBrush is a TileBrush which defines its tile content // by use of an ImageSource. // // History: // // 04/29/2003 : [....] - Created it. // 01/19/2005 : [....] - Removed SizeViewboxToContent. Moved UpdateResource // to the generated file. //--------------------------------------------------------------------------- using MS.Internal; using MS.Internal.PresentationCore; using System; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Reflection; 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; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows.Media { ////// ImageBrush - This TileBrush defines its content as an Image /// public sealed partial class ImageBrush : TileBrush { #region Constructors ////// Default constructor for ImageBrush. The resulting Brush has no content. /// public ImageBrush() { // We do this so that the property, when read, is consistent - not that // this will every actually affect drawing. } ////// ImageBrush Constructor where the image is set to the parameter's value /// /// The image source. public ImageBrush(ImageSource image) { ImageSource = image; } #endregion Constructors #region Protected methods ////// This node can introduce graphness /// internal override bool CanIntroduceGraphness() { if (ImageSource == null) { // If we don't have an ImageSource, we can't introduce // graphness right now, if we get an image source later // we'll precompute again. return false; } else { if (ImageSource.CanIntroduceGraphness()) { return true; } else { return false; } } } ////// Obtains the current bounds of the brush's content /// /// Output bounds of content protected override void GetContentBounds(out Rect contentBounds) { // Note, only implemented for DrawingImages. contentBounds = Rect.Empty; DrawingImage di = ImageSource as DrawingImage; if (di != null) { Drawing drawing = di.Drawing; if (drawing != null) { contentBounds = drawing.Bounds; } } } #endregion Protected methods #region Realization Support ////// Precompute is called during the frame preparation phase. Derived classes /// typically check if the brush requires realizations during this phase. /// internal override void Precompute() { ImageSource imageSource = ImageSource; if (imageSource != null) { imageSource.Precompute(); _requiresRealizationUpdates = imageSource.RequiresRealizationUpdates; } else { _requiresRealizationUpdates = false; } } ////// Checks if realization updates are required 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(Rect fillShapeBounds, RealizationContext ctx) { if (_requiresRealizationUpdates) { Matrix m; ImageSource imageSource = ImageSource; Debug.Assert(imageSource != null); // Otherwise _requiresRealizationUpdates would be false. GetTileBrushMapping(fillShapeBounds, out m); ctx.TransformStack.Push(ref m, true); imageSource.UpdateRealizations(ctx); ctx.TransformStack.Pop(); } } #endregion 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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