source: stable/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Search/SearchResultBackgroundRenderer.cs @ 17693

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Editing;
using ICSharpCode.AvalonEdit.Rendering;

namespace ICSharpCode.AvalonEdit.Search
{
  class SearchResultBackgroundRenderer : IBackgroundRenderer
  {
    TextSegmentCollection<SearchResult> currentResults = new TextSegmentCollection<SearchResult>();
    
    public TextSegmentCollection<SearchResult> CurrentResults {
      get { return currentResults; }
    }
    
    public KnownLayer Layer {
      get {
        // draw behind selection
        return KnownLayer.Selection;
      }
    }
    
    public SearchResultBackgroundRenderer()
    {
      markerBrush = Brushes.LightGreen;
      markerPen = new Pen(markerBrush, 1);
    }
    
    Brush markerBrush;
    Pen markerPen;
    
    public Brush MarkerBrush {
      get { return markerBrush; }
      set {
        this.markerBrush = value;
        markerPen = new Pen(markerBrush, 1);
      }
    }
    
    public void Draw(TextView textView, DrawingContext drawingContext)
    {
      if (textView == null)
        throw new ArgumentNullException("textView");
      if (drawingContext == null)
        throw new ArgumentNullException("drawingContext");
      
      if (currentResults == null || !textView.VisualLinesValid)
        return;
      
      var visualLines = textView.VisualLines;
      if (visualLines.Count == 0)
        return;
      
      int viewStart = visualLines.First().FirstDocumentLine.Offset;
      int viewEnd = visualLines.Last().LastDocumentLine.EndOffset;
      
      foreach (SearchResult result in currentResults.FindOverlappingSegments(viewStart, viewEnd - viewStart)) {
        BackgroundGeometryBuilder geoBuilder = new BackgroundGeometryBuilder();
        geoBuilder.AlignToMiddleOfPixels = true;
        geoBuilder.CornerRadius = 3;
        geoBuilder.AddSegment(textView, result);
        Geometry geometry = geoBuilder.CreateGeometry();
        if (geometry != null) {
          drawingContext.DrawGeometry(markerBrush, markerPen, geometry);
        }
      }
    }
  }
}