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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using MS.Internal.Documents;
using System.Windows.Media; // Visual
using System.Collections;
//
// Description:
// Implements the HighlightVisual element for rendering highlight for fixed
// document
//
namespace System.Windows.Documents
{
internal sealed class HighlightVisual : Adorner
{
//--------------------------------------------------------------------
//
// Constructors
//
//---------------------------------------------------------------------
#region Constructors
/// <summary>
/// HighlightVisual construction
/// </summary>
/// <param name="panel">FixedDocument where selection is taking place</param>
/// <param name="page">FixedPage that is being highlighted</param>
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;
}
/// <summary>
/// Draw highlight
/// </summary>
override protected void OnRender(DrawingContext dc)
{
#if DEBUG
DocumentsTrace.FixedTextOM.Highlight.Trace("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();
}
/// <summary>
/// Finds the HighlightVisual for this page.
/// </summary>
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;
}
}
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