Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Text / TextSpanModifier.cs / 1 / TextSpanModifier.cs
//------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation, 2001 // // File: TextSpanModifier.cs // // Created: 12-5-2004 [....] ([....]) // 8-4-2005 [....] Make it an internal implemenation of framework // //----------------------------------------------------------------------- using System; using System.Collections; using System.Globalization; using System.Windows; using System.Windows.Media; using System.Windows.Media.TextFormatting; namespace MS.Internal.Text { ////// TextModifier that can modify properties of a text span. /// It supports modifying TextDecorations and bid embedding levels /// over a span of runs. /// internal class TextSpanModifier : TextModifier { private int _length; private TextDecorationCollection _modifierDecorations; private Brush _modifierBrush; private FlowDirection _flowDirection; private bool _hasDirectionalEmbedding; ////// Creates a TextSpanModifier with the specified length and /// properties to modify TextDecorations. /// Instance created will not affect bidi embedding level. /// public TextSpanModifier(int length, TextDecorationCollection textDecorations, Brush foregroundBrush) { _length = length; _modifierDecorations = textDecorations; _modifierBrush = foregroundBrush; } ////// Creates a TextSpanModifier with the specified length and /// properties. Instance created will modify Bidi embedding level. It will also modify TextDecorations if the /// input TextDecorations is not null. /// public TextSpanModifier(int length, TextDecorationCollection textDecorations, Brush foregroundBrush, FlowDirection flowDirection) : this (length, textDecorations, foregroundBrush) { _hasDirectionalEmbedding = true; _flowDirection = flowDirection; } ////// Character length /// public sealed override int Length { get { return _length; } } ////// A set of properties shared by every characters in the run /// It is null for a TextModifier run. /// public sealed override TextRunProperties Properties { get { return null; } } ////// Modifies the properties of a text run. /// /// Properties of a text run or the return value of /// ModifyProperties for a nested text modifier. ///Returns the actual text run properties to be used for formatting, /// subject to further modification by text modifiers at outer scopes. public sealed override TextRunProperties ModifyProperties(TextRunProperties properties) { // Get the text decorations applied to the text modifier run. If there are // none, we don't change anything. if (properties == null || _modifierDecorations == null || _modifierDecorations.Count == 0) return properties; // Let brush be the foreground brush for the text modifier run. Any text // decorations defined at the text modifier scope that have a null Pen // should be drawn using this brush, which means we may need to copy some // TextDecoration objects and set the Pen property on the copies. We can // elide this if the same brush is used at both scopes. We shouldn't miss // too many optimization opportunities by using the (lower cost) reference // comparison here because in most cases where the brushes are equal it's // because it's an inherited property. Brush brush = _modifierBrush; if (object.ReferenceEquals(brush, properties.ForegroundBrush)) { // No need to set the pen property. brush = null; } // We're going to create a merged set of text decorations. TextDecorationCollection mergedDecorations; // Get the text decorations of the affected run, if any. TextDecorationCollection runDecorations = properties.TextDecorations; if (runDecorations == null || runDecorations.Count == 0) { // Only the text modifier run defines text decorations so // we don't need to merge anything. if (brush == null) { // Use the text decorations of the modifier run. mergedDecorations = _modifierDecorations; } else { // The foreground brushes differ so copy the text decorations to a // new collection and make sure each has a non-null pen. mergedDecorations = CopyTextDecorations(_modifierDecorations, brush); } } else { // Add the modifier decorations first because we want text decorations // defined at the inner scope (e.g., by the run) to be drawn on top. mergedDecorations = CopyTextDecorations(_modifierDecorations, brush); // Add the text decorations defined at the inner scope; we never need // to set the pen for these because they should be drawn using the // foreground brush. foreach (TextDecoration td in runDecorations) { mergedDecorations.Add(td); } } return new MergedTextRunProperties(properties, mergedDecorations); } public override bool HasDirectionalEmbedding { get { return _hasDirectionalEmbedding; } } public override FlowDirection FlowDirection { get { return _flowDirection; } } private TextDecorationCollection CopyTextDecorations(TextDecorationCollection textDecorations, Brush brush) { TextDecorationCollection result = new TextDecorationCollection(); Pen pen = null; foreach (TextDecoration td in textDecorations) { if (td.Pen == null && brush != null) { if (pen == null) pen = new Pen(brush, 1); TextDecoration copy = td.Clone(); copy.Pen = pen; result.Add(copy); } else { result.Add(td); } } return result; } private class MergedTextRunProperties : TextRunProperties { TextRunProperties _runProperties; TextDecorationCollection _textDecorations; internal MergedTextRunProperties( TextRunProperties runProperties, TextDecorationCollection textDecorations) { _runProperties = runProperties; _textDecorations = textDecorations; } public override Typeface Typeface { get { return _runProperties.Typeface; } } public override double FontRenderingEmSize { get { return _runProperties.FontRenderingEmSize; } } public override double FontHintingEmSize { get { return _runProperties.FontHintingEmSize; } } public override TextDecorationCollection TextDecorations { get { return _textDecorations; } } public override Brush ForegroundBrush { get { return _runProperties.ForegroundBrush; } } public override Brush BackgroundBrush { get { return _runProperties.BackgroundBrush; } } public override CultureInfo CultureInfo { get { return _runProperties.CultureInfo; } } public override TextEffectCollection TextEffects { get { return _runProperties.TextEffects; } } public override BaselineAlignment BaselineAlignment { get { return _runProperties.BaselineAlignment; } } public override TextRunTypographyProperties TypographyProperties { get { return _runProperties.TypographyProperties; } } public override NumberSubstitution NumberSubstitution { get { return _runProperties.NumberSubstitution; } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DirectionalLight.cs
- CustomBindingElement.cs
- Path.cs
- SqlNamer.cs
- Mapping.cs
- KeyBinding.cs
- SecureEnvironment.cs
- ConnectionInterfaceCollection.cs
- AssemblyResourceLoader.cs
- GraphicsContainer.cs
- AssociationEndMember.cs
- ipaddressinformationcollection.cs
- XmlHierarchyData.cs
- ReadOnlyPropertyMetadata.cs
- MultiPageTextView.cs
- SpecularMaterial.cs
- ListComponentEditor.cs
- ColorTransformHelper.cs
- Signature.cs
- WriteFileContext.cs
- HttpApplication.cs
- BrowserInteropHelper.cs
- GridViewColumnHeader.cs
- RootAction.cs
- FlatButtonAppearance.cs
- ClientCultureInfo.cs
- MasterPageBuildProvider.cs
- Bind.cs
- DateBoldEvent.cs
- XpsResource.cs
- ActiveXContainer.cs
- Geometry.cs
- DataTemplate.cs
- TypeContext.cs
- ByteKeyFrameCollection.cs
- SecureEnvironment.cs
- JsonDataContract.cs
- DirectionalAction.cs
- UnsafeNativeMethods.cs
- SqlMultiplexer.cs
- unitconverter.cs
- coordinatorfactory.cs
- PinnedBufferMemoryStream.cs
- SpotLight.cs
- HttpCachePolicy.cs
- TypePropertyEditor.cs
- Environment.cs
- TrustSection.cs
- RotationValidation.cs
- ErrorRuntimeConfig.cs
- PriorityRange.cs
- XsdBuilder.cs
- Rect3DValueSerializer.cs
- WebColorConverter.cs
- DBNull.cs
- ToolStripItemImageRenderEventArgs.cs
- EDesignUtil.cs
- SystemFonts.cs
- XmlDeclaration.cs
- WindowHideOrCloseTracker.cs
- entityreference_tresulttype.cs
- DesignTimeDataBinding.cs
- FamilyTypeface.cs
- CssClassPropertyAttribute.cs
- RoutingTable.cs
- ValueSerializerAttribute.cs
- RepeatInfo.cs
- Binding.cs
- CachedFontFace.cs
- SystemParameters.cs
- TaiwanLunisolarCalendar.cs
- MetadataCache.cs
- TriggerAction.cs
- BufferBuilder.cs
- ClrProviderManifest.cs
- TextWriterTraceListener.cs
- WpfWebRequestHelper.cs
- CommandID.cs
- WebPartRestoreVerb.cs
- HostProtectionPermission.cs
- VisualProxy.cs
- PreApplicationStartMethodAttribute.cs
- SHA1.cs
- SHA384.cs
- ToolStrip.cs
- EventToken.cs
- UpdateTranslator.cs
- WpfPayload.cs
- LinearGradientBrush.cs
- EnvelopedSignatureTransform.cs
- EncodingNLS.cs
- DetailsViewPageEventArgs.cs
- PersonalizationState.cs
- SelectionBorderGlyph.cs
- PrimaryKeyTypeConverter.cs
- CommandField.cs
- ScrollChrome.cs
- localization.cs
- MetadataPropertyCollection.cs
- UserPersonalizationStateInfo.cs