Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / SpellerHighlightLayer.cs / 1 / SpellerHighlightLayer.cs
//---------------------------------------------------------------------------- // // File: SpellerHighlightLayer.cs // // Description: Highlight rendering for the Speller. // //--------------------------------------------------------------------------- using System; using MS.Internal; using System.Windows.Documents; using System.Windows.Media; using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; namespace System.Windows.Documents { // Highlight rendering for the Speller. // The speller tags errors with red squigglies. internal class SpellerHighlightLayer : HighlightLayer { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Static constructor. static SpellerHighlightLayer() { _errorTextDecorations = GetErrorTextDecorations(); } // Constructor. internal SpellerHighlightLayer(Speller speller) { _speller = speller; } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods // Returns a TextDecorationCollection used to tag spelling errors, // or DependencyProperty.UnsetValue if there's no error at the specified position. internal override object GetHighlightValue(StaticTextPointer textPosition, LogicalDirection direction) { object value; if (IsContentHighlighted(textPosition, direction)) { value = _errorTextDecorations; } else { value = DependencyProperty.UnsetValue; } return value; } // Returns true iff the indicated content has scoping highlights. internal override bool IsContentHighlighted(StaticTextPointer textPosition, LogicalDirection direction) { return _speller.StatusTable.IsRunType(textPosition, direction, SpellerStatusTable.RunType.Error); } // Returns the position of the next highlight start or end in an // indicated direction, or null if there is no such position. internal override StaticTextPointer GetNextChangePosition(StaticTextPointer textPosition, LogicalDirection direction) { return _speller.StatusTable.GetNextErrorTransition(textPosition, direction); } // Raises a Changed event for any listeners, covering the // specified text. internal void FireChangedEvent(ITextPointer start, ITextPointer end) { if (Changed != null) { Changed(this, new SpellerHighlightChangedEventArgs(start, end)); } } #endregion Internal Methods //------------------------------------------------------ // // Internal Properties // //------------------------------------------------------ #region Internal Properties // Type identifying this layer for Highlights.GetHighlightValue calls. internal override Type OwnerType { get { return typeof(SpellerHighlightLayer); } } #endregion Internal Properties //----------------------------------------------------- // // Internal Events // //------------------------------------------------------ #region Internal Events ////// Event raised when a highlight range is inserted, removed, moved, or /// has a local property value change. /// internal override event HighlightChangedEventHandler Changed; #endregion Internal Events //----------------------------------------------------- // // Private Methods // //----------------------------------------------------- #region Private Methods // Calculates TextDecorations for speller errors. private static TextDecorationCollection GetErrorTextDecorations() { // // Build a "squiggle" Brush. // // This works by hard-coding a 3 pixel high TextDecoration, and // then tiling horizontally. (We can't scale the squiggle in // the vertical direction, there's no support to limit tiling // to just the horizontal from the MIL.) // DrawingGroup drawingGroup = new DrawingGroup(); DrawingContext drawingContext = drawingGroup.Open(); Pen pen = new Pen(Brushes.Red, 0.33); // This is our tile: // // x x // x x // x // drawingContext.DrawLine(pen, new Point(0.0, 0.0), new Point(0.5, 1.0)); drawingContext.DrawLine(pen, new Point(0.5, 1.0), new Point(1.0, 0.0)); drawingContext.Close(); DrawingBrush brush = new DrawingBrush(drawingGroup); brush.TileMode = TileMode.Tile; brush.Viewport = new Rect(0, 0, 3, 3); brush.ViewportUnits = BrushMappingMode.Absolute; TextDecoration textDecoration = new TextDecoration( TextDecorationLocation.Underline, new Pen(brush, 3), 0, TextDecorationUnit.FontRecommended, TextDecorationUnit.Pixel); TextDecorationCollection decorationCollection = new TextDecorationCollection(); decorationCollection.Add(textDecoration); decorationCollection.Freeze(); return decorationCollection; } #endregion Private Methods //----------------------------------------------------- // // Private Types // //------------------------------------------------------ #region Private Types // Argument for the Changed event, encapsulates a highlight change. private class SpellerHighlightChangedEventArgs : HighlightChangedEventArgs { // Constructor. internal SpellerHighlightChangedEventArgs(ITextPointer start, ITextPointer end) { Listlist; Invariant.Assert(start.CompareTo(end) < 0, "Bogus start/end combination!"); list = new List (1); list.Add(new TextSegment(start, end)); _ranges = new ReadOnlyCollection (list); } // Collection of changed content ranges. internal override IList Ranges { get { return _ranges; } } // Type identifying the owner of the changed layer. internal override Type OwnerType { get { return typeof(SpellerHighlightLayer); } } // Collection of changed content ranges. private readonly ReadOnlyCollection _ranges; } #endregion Private Types //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Fields // Assocated Speller. private readonly Speller _speller; // Decorations for text flagged with a spelling error. private static readonly TextDecorationCollection _errorTextDecorations; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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