120 lines
3.1 KiB
C#
120 lines
3.1 KiB
C#
// <file>
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// <copyright see="prj:///doc/copyright.txt"/>
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// <license see="prj:///doc/license.txt"/>
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// <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
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// <version>$Revision$</version>
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// </file>
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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namespace ICSharpCode.TextEditor.Document
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{
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/// <summary>
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/// Manages the list of markers and provides ways to retrieve markers for specific positions.
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/// </summary>
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public sealed class MarkerStrategy
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{
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List<TextMarker> textMarker = new List<TextMarker>();
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IDocument document;
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public IDocument Document {
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get {
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return document;
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}
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}
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public IEnumerable<TextMarker> TextMarker {
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get {
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return textMarker.AsReadOnly();
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}
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}
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public void AddMarker(TextMarker item)
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{
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markersTable.Clear();
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textMarker.Add(item);
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}
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public void InsertMarker(int index, TextMarker item)
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{
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markersTable.Clear();
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textMarker.Insert(index, item);
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}
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public void RemoveMarker(TextMarker item)
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{
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markersTable.Clear();
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textMarker.Remove(item);
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}
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public void RemoveAll(Predicate<TextMarker> match)
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{
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markersTable.Clear();
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textMarker.RemoveAll(match);
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}
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public MarkerStrategy(IDocument document)
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{
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this.document = document;
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document.DocumentChanged += new DocumentEventHandler(DocumentChanged);
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}
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Dictionary<int, List<TextMarker>> markersTable = new Dictionary<int, List<TextMarker>>();
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public List<TextMarker> GetMarkers(int offset)
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{
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if (!markersTable.ContainsKey(offset)) {
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List<TextMarker> markers = new List<TextMarker>();
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for (int i = 0; i < textMarker.Count; ++i) {
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TextMarker marker = (TextMarker)textMarker[i];
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if (marker.Offset <= offset && offset <= marker.EndOffset) {
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markers.Add(marker);
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}
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}
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markersTable[offset] = markers;
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}
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return markersTable[offset];
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}
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public List<TextMarker> GetMarkers(int offset, int length)
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{
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int endOffset = offset + length - 1;
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List<TextMarker> markers = new List<TextMarker>();
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for (int i = 0; i < textMarker.Count; ++i) {
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TextMarker marker = (TextMarker)textMarker[i];
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if (// start in marker region
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marker.Offset <= offset && offset <= marker.EndOffset ||
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// end in marker region
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marker.Offset <= endOffset && endOffset <= marker.EndOffset ||
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// marker start in region
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offset <= marker.Offset && marker.Offset <= endOffset ||
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// marker end in region
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offset <= marker.EndOffset && marker.EndOffset <= endOffset
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)
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{
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markers.Add(marker);
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}
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}
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return markers;
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}
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public List<TextMarker> GetMarkers(TextLocation position)
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{
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if (position.Y >= document.TotalNumberOfLines || position.Y < 0) {
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return new List<TextMarker>();
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}
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LineSegment segment = document.GetLineSegment(position.Y);
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return GetMarkers(segment.Offset + position.X);
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}
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void DocumentChanged(object sender, DocumentEventArgs e)
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{
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// reset markers table
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markersTable.Clear();
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document.UpdateSegmentListOnDocumentChange(textMarker, e);
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}
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}
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}
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