/ILSpy/TextView/ReferenceElementGenerator.cs
http://github.com/icsharpcode/ILSpy · C# · 114 lines · 66 code · 11 blank · 37 comment · 11 complexity · 11564475b7c1dd8894c0c5502dc7258c MD5 · raw file
- // Copyright (c) 2011 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.Windows.Input;
- using ICSharpCode.AvalonEdit.Document;
- using ICSharpCode.AvalonEdit.Rendering;
- namespace ICSharpCode.ILSpy.TextView
- {
- /// <summary>
- /// Creates hyperlinks in the text view.
- /// </summary>
- sealed class ReferenceElementGenerator : VisualLineElementGenerator
- {
- readonly Action<ReferenceSegment> referenceClicked;
- readonly Predicate<ReferenceSegment> isLink;
-
- /// <summary>
- /// The collection of references (hyperlinks).
- /// </summary>
- public TextSegmentCollection<ReferenceSegment> References { get; set; }
-
- public ReferenceElementGenerator(Action<ReferenceSegment> referenceClicked, Predicate<ReferenceSegment> isLink)
- {
- if (referenceClicked == null)
- throw new ArgumentNullException(nameof(referenceClicked));
- if (isLink == null)
- throw new ArgumentNullException(nameof(isLink));
- this.referenceClicked = referenceClicked;
- this.isLink = isLink;
- }
-
- public override int GetFirstInterestedOffset(int startOffset)
- {
- if (this.References == null)
- return -1;
- // inform AvalonEdit about the next position where we want to build a hyperlink
- var segment = this.References.FindFirstSegmentWithStartAfter(startOffset);
- return segment != null ? segment.StartOffset : -1;
- }
-
- public override VisualLineElement ConstructElement(int offset)
- {
- if (this.References == null)
- return null;
- foreach (var segment in this.References.FindSegmentsContaining(offset)) {
- // skip all non-links
- if (!isLink(segment))
- continue;
- // ensure that hyperlinks don't span several lines (VisualLineElements can't contain line breaks)
- int endOffset = Math.Min(segment.EndOffset, CurrentContext.VisualLine.LastDocumentLine.EndOffset);
- // don't create hyperlinks with length 0
- if (offset < endOffset) {
- return new VisualLineReferenceText(CurrentContext.VisualLine, endOffset - offset, this, segment);
- }
- }
- return null;
- }
-
- internal void JumpToReference(ReferenceSegment referenceSegment)
- {
- referenceClicked(referenceSegment);
- }
- }
-
- /// <summary>
- /// VisualLineElement that represents a piece of text and is a clickable link.
- /// </summary>
- sealed class VisualLineReferenceText : VisualLineText
- {
- readonly ReferenceElementGenerator parent;
- readonly ReferenceSegment referenceSegment;
-
- /// <summary>
- /// Creates a visual line text element with the specified length.
- /// It uses the <see cref="ITextRunConstructionContext.VisualLine"/> and its
- /// <see cref="VisualLineElement.RelativeTextOffset"/> to find the actual text string.
- /// </summary>
- public VisualLineReferenceText(VisualLine parentVisualLine, int length, ReferenceElementGenerator parent, ReferenceSegment referenceSegment) : base(parentVisualLine, length)
- {
- this.parent = parent;
- this.referenceSegment = referenceSegment;
- }
-
- /// <inheritdoc/>
- protected override void OnQueryCursor(QueryCursorEventArgs e)
- {
- e.Handled = true;
- e.Cursor = referenceSegment.IsLocal ? Cursors.Arrow : Cursors.Hand;
- }
-
- /// <inheritdoc/>
- protected override VisualLineText CreateInstance(int length)
- {
- return new VisualLineReferenceText(ParentVisualLine, length, parent, referenceSegment);
- }
- }
- }