Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / HighlightVisual.cs / 1305600 / HighlightVisual.cs
//---------------------------------------------------------------------------- //// Copyright (C) 2003 by Microsoft Corporation. All rights reserved. // // // Description: // Implements the HighlightVisual element for rendering highlight for fixed // document // // History: // 03/08/2004 - Eric Leese (eleese) - Created. // //--------------------------------------------------------------------------- namespace System.Windows.Documents { using MS.Internal; // DoubleUtil using MS.Internal.Documents; using MS.Utility; // ExceptionStringTable using System.ComponentModel; using System.Windows.Threading; // Dispatcher using System.Windows; // DependencyID etc. using System.Windows.Media; // Visual using System.Windows.Shapes; // Glyphs using System; using System.Collections; using System.IO; using System.Diagnostics; internal sealed class HighlightVisual : Adorner { //------------------------------------------------------------------- // // Constructors // //--------------------------------------------------------------------- #region Constructors ////// HighlightVisual construction /// /// FixedDocument where selection is taking place /// FixedPage that is being highlighted internal HighlightVisual(FixedDocument panel, FixedPage page) : base(page) { _panel = panel; _page = page; } #endregion Constructors //-------------------------------------------------------------------- // // Public Methods // //--------------------------------------------------------------------- //-------------------------------------------------------------------- // // Public Properties // //---------------------------------------------------------------------- //------------------------------------------------------------------- // // Public Events // //---------------------------------------------------------------------- //------------------------------------------------------------------- // // Protected Methods // //--------------------------------------------------------------------- #region Protected Methods protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters) { return null; } protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParameters) { return null; } ////// Draw highlight /// override protected void OnRender(DrawingContext dc) { #if DEBUG DocumentsTrace.FixedTextOM.Highlight.Trace(string.Format("HightlightVisual Rendering")); #endif if (_panel.Highlights.ContainsKey(_page)) { ArrayList highlights = _panel.Highlights[_page]; Size pageSize = _panel.ComputePageSize(_page); Rect clipRect = new Rect(new Point(0, 0), pageSize); dc.PushClip(new RectangleGeometry(clipRect)); if (highlights != null) { _UpdateHighlightBackground(dc, highlights); _UpdateHighlightForeground(dc, highlights); } dc.Pop(); //clip } if (_rubberbandSelector != null && _rubberbandSelector.Page == _page) { Rect r = _rubberbandSelector.SelectionRect; if (!r.IsEmpty) { dc.DrawRectangle(SelectionHighlightInfo.ObjectMaskBrush, null, r); } } } #endregion Protected Methods //------------------------------------------------------------------- // // Internal Methods // //---------------------------------------------------------------------- #region Internal Methods internal void InvalidateHighlights() { AdornerLayer al = AdornerLayer.GetAdornerLayer(_page); if (al == null) { return; } al.Update(_page); } internal void UpdateRubberbandSelection(RubberbandSelector selector) { _rubberbandSelector = selector; InvalidateHighlights(); } ////// Finds the HighlightVisual for this page. /// internal static HighlightVisual GetHighlightVisual(FixedPage page) { AdornerLayer al = AdornerLayer.GetAdornerLayer(page); HighlightVisual hv; if (al == null) { return null; } Adorner[] adorners = al.GetAdorners(page); if (adorners != null) { foreach (Adorner ad in adorners) { hv = ad as HighlightVisual; if (hv != null) { return hv; } } } return null; } #endregion Internal Methods #region private Methods private void _UpdateHighlightBackground(DrawingContext dc, ArrayList highlights) { Debug.Assert(highlights != null); PathGeometry highlightGeometry = null; Brush highlightBrush = null; Rect combinedRect = Rect.Empty; foreach (FixedHighlight fh in highlights) { Brush bg = null; if (fh.HighlightType == FixedHighlightType.None) { #if NEVER // use this code if you want to see unrecognized highlights bg = Brushes.Yellow; #else continue; #endif } Rect backgroundRect = fh.ComputeDesignRect(); if (backgroundRect == Rect.Empty) { continue; } GeneralTransform transform = fh.Element.TransformToAncestor(_page); // This is a workaround. We should really look into changing Transform t = transform.AffineTransform; if (t == null) { t = Transform.Identity; } // Inflate by 1 pixel on each side to have a better selection visual for continuous lines // backgroundRect.Inflate(1,1); Glyphs g = fh.Glyphs; if (fh.HighlightType == FixedHighlightType.TextSelection) { bg = (g == null) ? SelectionHighlightInfo.ObjectMaskBrush : SelectionHighlightInfo.BackgroundBrush; } else if (fh.HighlightType == FixedHighlightType.AnnotationHighlight) { bg = fh.BackgroundBrush; } // can add cases for new types of highlights if (fh.Element.Clip != null) { Rect clipRect = fh.Element.Clip.Bounds; backgroundRect.Intersect(clipRect); //thisGeometry = Geometry.Combine(thisGeometry, fh.Element.Clip, GeometryCombineMode.Intersect, t); } Geometry thisGeometry = new RectangleGeometry(backgroundRect); thisGeometry.Transform = t; backgroundRect = transform.TransformBounds(backgroundRect); // used to cut down on calls to Geometry.Combine for complex geometries // involving multiple non-intersecting paths Debug.Assert(bg != null); if (bg != highlightBrush || backgroundRect.Top > combinedRect.Bottom + .1 || backgroundRect.Bottom + .1 < combinedRect.Top || backgroundRect.Left > combinedRect.Right + .1 || backgroundRect.Right + .1 < combinedRect.Left) { if (highlightBrush != null) { Debug.Assert(highlightGeometry != null); highlightGeometry.FillRule = FillRule.Nonzero; dc.DrawGeometry(highlightBrush, null, highlightGeometry); } highlightBrush = bg; highlightGeometry = new PathGeometry(); highlightGeometry.AddGeometry(thisGeometry); combinedRect = backgroundRect; } else { highlightGeometry.AddGeometry(thisGeometry); combinedRect.Union(backgroundRect); } } if (highlightBrush != null) { Debug.Assert(highlightGeometry != null); highlightGeometry.FillRule = FillRule.Nonzero; dc.DrawGeometry(highlightBrush, null, highlightGeometry); } } private void _UpdateHighlightForeground(DrawingContext dc, ArrayList highlights) { foreach (FixedHighlight fh in highlights) { Brush fg = null; if (fh.HighlightType == FixedHighlightType.None) { #if NEVER // use this code if you want to see unrecognized highlights bg = Brushes.Yellow; #else continue; #endif } Glyphs g = fh.Glyphs; if (g == null) { continue; } Rect clipRect = fh.ComputeDesignRect(); if (clipRect == Rect.Empty) { continue; } GeneralTransform transform = fh.Element.TransformToAncestor(_page); Transform t = transform.AffineTransform; if (t != null) { dc.PushTransform(t); } else { dc.PushTransform(Transform.Identity); } dc.PushClip(new RectangleGeometry(clipRect)); if (fh.HighlightType == FixedHighlightType.TextSelection) { fg = SelectionHighlightInfo.ForegroundBrush; } else if (fh.HighlightType == FixedHighlightType.AnnotationHighlight) { fg = fh.ForegroundBrush; } // can add cases for new types of highlights GlyphRun gr = g.ToGlyphRun(); if (fg == null) { fg = g.Fill; } dc.PushGuidelineY1(gr.BaselineOrigin.Y); dc.PushClip(g.Clip); dc.DrawGlyphRun(fg, gr); dc.Pop(); // Glyphs clip dc.Pop(); // Guideline dc.Pop(); // clip dc.Pop(); // transform } } #endregion //------------------------------------------------------------------- // // private Properties // //---------------------------------------------------------------------- //-------------------------------------------------------------------- // // Private Methods // //--------------------------------------------------------------------- //-------------------------------------------------------------------- // // Private Fields // //--------------------------------------------------------------------- private FixedDocument _panel; private RubberbandSelector _rubberbandSelector; private FixedPage _page; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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