HighlightVisual.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / HighlightVisual.cs / 1 / 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 - [....] ([....]) - 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. All rights reserved.
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HighlightVisual.cs source code in C# .NET

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