Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / MS / Internal / TextFormatting / DrawingState.cs / 1 / DrawingState.cs
//------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation // // File: DrawingState.cs // // Contents: Drawing state of full text // // Created: 1-29-2005 Worachai Chaoweeraprasit (wchao) // //----------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using System.Windows.Media; namespace MS.Internal.TextFormatting { ////// Formatting state of full text /// internal sealed class DrawingState : IDisposable { private TextMetrics.FullTextLine _currentLine; // full text line currently formatted private DrawingContext _drawingContext; // current drawing context private Point _lineOrigin; // line origin XY relative to drawing context reference location private Point _vectorToLineOrigin; // vector to line origin in UV relative to paragraph start private MatrixTransform _antiInversion; // anti-inversion transform applied on drawing surface private bool _overrideBaseGuidelineY; // a flag indicating whether a new guideline overrides the line's Y guideline private double _baseGuidelineY; // the Y guideline of the text line. ////// Construct drawing state for full text /// internal DrawingState( DrawingContext drawingContext, Point lineOrigin, MatrixTransform antiInversion, TextMetrics.FullTextLine currentLine ) { _drawingContext = drawingContext; _antiInversion = antiInversion; _currentLine = currentLine; if (antiInversion == null) { _lineOrigin = lineOrigin; } else { _vectorToLineOrigin = lineOrigin; } if (_drawingContext != null) { // LineServices draws GlyphRun and TextDecorations in multiple // callbacks and GlyphRuns may have different baselines. Pushing guideline // for each DrawGlyphRun are too costly. We optimize for the common case where // GlyphRuns and TextDecorations in the TextLine share the same baseline. _baseGuidelineY = lineOrigin.Y + currentLine.Baseline; _drawingContext.PushGuidelineY1(_baseGuidelineY); } } ////// Set guideline Y for a drawing operation if necessary. It is a no-op if the Y value is the same /// as the guideline Y of the line. Otherwise, it will push the Y to override the guideline of the line. /// A SetGuidelineY() must be paired with an UnsetGuidelineY() to ensure balanced push and pop. /// internal void SetGuidelineY(double runGuidelineY) { if (_drawingContext == null) return; Invariant.Assert(!_overrideBaseGuidelineY); if (runGuidelineY != _baseGuidelineY) { // Push a new guideline to override the line's guideline _drawingContext.PushGuidelineY1(runGuidelineY); _overrideBaseGuidelineY = true; // the new Guideline Y overrides the line's guideline until next unset. } } ////// Unset guideline Y for a drawing operation if necessary. It is a no-op if the Y value is the same /// as the guideline Y of the line. Otherwise, it will push the Y to override the guideline of the line. /// A SetGuidelineY() must be paired with an UnsetGuidelineY() to ensure balanced push and pop. /// internal void UnsetGuidelineY() { if (_overrideBaseGuidelineY) { _drawingContext.Pop(); _overrideBaseGuidelineY = false; } } ////// Clean up internal state. /// public void Dispose() { // clear the guideline at line's baseline if (_drawingContext != null) { _drawingContext.Pop(); } } ////// Current drawing context /// internal DrawingContext DrawingContext { get { return _drawingContext; } } ////// Anti-inversion transform applied on drawing surface /// internal MatrixTransform AntiInversion { get { return _antiInversion; } } ////// Origin XY of the current line relative to the drawing context reference location /// internal Point LineOrigin { get { return _lineOrigin; } } ////// Vector to line origin in UV relative to paragraph start /// internal Point VectorToLineOrigin { get { return _vectorToLineOrigin; } } ////// Line currently being drawn /// internal TextMetrics.FullTextLine CurrentLine { get { return _currentLine; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation // // File: DrawingState.cs // // Contents: Drawing state of full text // // Created: 1-29-2005 Worachai Chaoweeraprasit (wchao) // //----------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using System.Windows.Media; namespace MS.Internal.TextFormatting { ////// Formatting state of full text /// internal sealed class DrawingState : IDisposable { private TextMetrics.FullTextLine _currentLine; // full text line currently formatted private DrawingContext _drawingContext; // current drawing context private Point _lineOrigin; // line origin XY relative to drawing context reference location private Point _vectorToLineOrigin; // vector to line origin in UV relative to paragraph start private MatrixTransform _antiInversion; // anti-inversion transform applied on drawing surface private bool _overrideBaseGuidelineY; // a flag indicating whether a new guideline overrides the line's Y guideline private double _baseGuidelineY; // the Y guideline of the text line. ////// Construct drawing state for full text /// internal DrawingState( DrawingContext drawingContext, Point lineOrigin, MatrixTransform antiInversion, TextMetrics.FullTextLine currentLine ) { _drawingContext = drawingContext; _antiInversion = antiInversion; _currentLine = currentLine; if (antiInversion == null) { _lineOrigin = lineOrigin; } else { _vectorToLineOrigin = lineOrigin; } if (_drawingContext != null) { // LineServices draws GlyphRun and TextDecorations in multiple // callbacks and GlyphRuns may have different baselines. Pushing guideline // for each DrawGlyphRun are too costly. We optimize for the common case where // GlyphRuns and TextDecorations in the TextLine share the same baseline. _baseGuidelineY = lineOrigin.Y + currentLine.Baseline; _drawingContext.PushGuidelineY1(_baseGuidelineY); } } ////// Set guideline Y for a drawing operation if necessary. It is a no-op if the Y value is the same /// as the guideline Y of the line. Otherwise, it will push the Y to override the guideline of the line. /// A SetGuidelineY() must be paired with an UnsetGuidelineY() to ensure balanced push and pop. /// internal void SetGuidelineY(double runGuidelineY) { if (_drawingContext == null) return; Invariant.Assert(!_overrideBaseGuidelineY); if (runGuidelineY != _baseGuidelineY) { // Push a new guideline to override the line's guideline _drawingContext.PushGuidelineY1(runGuidelineY); _overrideBaseGuidelineY = true; // the new Guideline Y overrides the line's guideline until next unset. } } ////// Unset guideline Y for a drawing operation if necessary. It is a no-op if the Y value is the same /// as the guideline Y of the line. Otherwise, it will push the Y to override the guideline of the line. /// A SetGuidelineY() must be paired with an UnsetGuidelineY() to ensure balanced push and pop. /// internal void UnsetGuidelineY() { if (_overrideBaseGuidelineY) { _drawingContext.Pop(); _overrideBaseGuidelineY = false; } } ////// Clean up internal state. /// public void Dispose() { // clear the guideline at line's baseline if (_drawingContext != null) { _drawingContext.Pop(); } } ////// Current drawing context /// internal DrawingContext DrawingContext { get { return _drawingContext; } } ////// Anti-inversion transform applied on drawing surface /// internal MatrixTransform AntiInversion { get { return _antiInversion; } } ////// Origin XY of the current line relative to the drawing context reference location /// internal Point LineOrigin { get { return _lineOrigin; } } ////// Vector to line origin in UV relative to paragraph start /// internal Point VectorToLineOrigin { get { return _vectorToLineOrigin; } } ////// Line currently being drawn /// internal TextMetrics.FullTextLine CurrentLine { get { return _currentLine; } } } } // 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
- FontFamily.cs
- SecurityCriticalDataForSet.cs
- TreeNode.cs
- NGCSerializer.cs
- ScriptControlManager.cs
- DataGridCommandEventArgs.cs
- IDispatchConstantAttribute.cs
- SessionState.cs
- AnnotationComponentChooser.cs
- MediaTimeline.cs
- SoapIgnoreAttribute.cs
- ToolStripItemDataObject.cs
- GradientBrush.cs
- WpfPayload.cs
- DataGridViewAutoSizeColumnModeEventArgs.cs
- updatecommandorderer.cs
- EntityViewContainer.cs
- FactoryGenerator.cs
- EmptyStringExpandableObjectConverter.cs
- LineGeometry.cs
- DeferredReference.cs
- StringArrayEditor.cs
- SoapIgnoreAttribute.cs
- TCPClient.cs
- StylusPointPropertyInfo.cs
- FilterElement.cs
- COM2PropertyDescriptor.cs
- MimeMapping.cs
- BindUriHelper.cs
- XmlSchemaAttributeGroup.cs
- DESCryptoServiceProvider.cs
- PassportAuthentication.cs
- Accessible.cs
- ClientEventManager.cs
- RecipientInfo.cs
- KeyValueInternalCollection.cs
- BitmapCodecInfo.cs
- MimeFormImporter.cs
- AssemblyAssociatedContentFileAttribute.cs
- ValidationRuleCollection.cs
- BulletedList.cs
- Geometry3D.cs
- FormViewDeletedEventArgs.cs
- MethodCallExpression.cs
- TextDecoration.cs
- DynamicResourceExtensionConverter.cs
- TheQuery.cs
- ActivityWithResultWrapper.cs
- VideoDrawing.cs
- ImageField.cs
- TrackingParticipant.cs
- ParserContext.cs
- TextInfo.cs
- PriorityQueue.cs
- SecurityState.cs
- UnknownBitmapDecoder.cs
- ValidationError.cs
- SettingsPropertyValue.cs
- ConvertEvent.cs
- MembershipSection.cs
- AppDomainProtocolHandler.cs
- DbgUtil.cs
- wgx_commands.cs
- DecimalStorage.cs
- TreeViewDesigner.cs
- EntityParameter.cs
- CompModHelpers.cs
- AbandonedMutexException.cs
- SearchForVirtualItemEventArgs.cs
- StateDesignerConnector.cs
- ProviderIncompatibleException.cs
- DataBoundControlAdapter.cs
- DataListItem.cs
- Point3DConverter.cs
- fixedPageContentExtractor.cs
- EpmSyndicationContentSerializer.cs
- LogPolicy.cs
- DateTimeFormatInfoScanner.cs
- DispatchChannelSink.cs
- latinshape.cs
- ToolCreatedEventArgs.cs
- SqlGatherProducedAliases.cs
- PartialCachingControl.cs
- VirtualPathProvider.cs
- SHA1Managed.cs
- SqlReorderer.cs
- SizeIndependentAnimationStorage.cs
- PromptBuilder.cs
- DocumentSchemaValidator.cs
- PersonalizationProvider.cs
- RoutedCommand.cs
- WebPartHeaderCloseVerb.cs
- IntSecurity.cs
- ResourceReferenceExpressionConverter.cs
- ResourceReferenceExpressionConverter.cs
- SqlLiftIndependentRowExpressions.cs
- HtmlElementCollection.cs
- CanonicalFontFamilyReference.cs
- DesignerTextViewAdapter.cs
- SimpleBitVector32.cs