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source: branches/ALPS/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Rendering/VisualLineLinkText.cs @ 12048

Last change on this file since 12048 was 11700, checked in by jkarder, 10 years ago

#2077: created branch and added first version

File size: 4.8 KB
Line 
1// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
2//
3// Permission is hereby granted, free of charge, to any person obtaining a copy of this
4// software and associated documentation files (the "Software"), to deal in the Software
5// without restriction, including without limitation the rights to use, copy, modify, merge,
6// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
7// to whom the Software is furnished to do so, subject to the following conditions:
8//
9// The above copyright notice and this permission notice shall be included in all copies or
10// substantial portions of the Software.
11//
12// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
13// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
14// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
15// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
16// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
17// DEALINGS IN THE SOFTWARE.
18
19using System;
20using System.Collections.Generic;
21using System.Diagnostics;
22using System.Windows;
23using System.Windows.Documents;
24using System.Windows.Input;
25using System.Windows.Media;
26using System.Windows.Media.TextFormatting;
27using System.Windows.Navigation;
28
29namespace ICSharpCode.AvalonEdit.Rendering
30{
31  /// <summary>
32  /// VisualLineElement that represents a piece of text and is a clickable link.
33  /// </summary>
34  public class VisualLineLinkText : VisualLineText
35  {
36    /// <summary>
37    /// Gets/Sets the URL that is navigated to when the link is clicked.
38    /// </summary>
39    public Uri NavigateUri { get; set; }
40   
41    /// <summary>
42    /// Gets/Sets the window name where the URL will be opened.
43    /// </summary>
44    public string TargetName { get; set; }
45   
46    /// <summary>
47    /// Gets/Sets whether the user needs to press Control to click the link.
48    /// The default value is true.
49    /// </summary>
50    public bool RequireControlModifierForClick { get; set; }
51   
52    /// <summary>
53    /// Creates a visual line text element with the specified length.
54    /// It uses the <see cref="ITextRunConstructionContext.VisualLine"/> and its
55    /// <see cref="VisualLineElement.RelativeTextOffset"/> to find the actual text string.
56    /// </summary>
57    public VisualLineLinkText(VisualLine parentVisualLine, int length) : base(parentVisualLine, length)
58    {
59      this.RequireControlModifierForClick = true;
60    }
61   
62    /// <inheritdoc/>
63    public override TextRun CreateTextRun(int startVisualColumn, ITextRunConstructionContext context)
64    {
65      this.TextRunProperties.SetForegroundBrush(context.TextView.LinkTextForegroundBrush);
66      this.TextRunProperties.SetBackgroundBrush(context.TextView.LinkTextBackgroundBrush);
67      this.TextRunProperties.SetTextDecorations(TextDecorations.Underline);
68      return base.CreateTextRun(startVisualColumn, context);
69    }
70   
71    /// <summary>
72    /// Gets whether the link is currently clickable.
73    /// </summary>
74    /// <remarks>Returns true when control is pressed; or when
75    /// <see cref="RequireControlModifierForClick"/> is disabled.</remarks>
76    protected bool LinkIsClickable()
77    {
78      if (NavigateUri == null)
79        return false;
80      if (RequireControlModifierForClick)
81        return (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control;
82      else
83        return true;
84    }
85   
86    /// <inheritdoc/>
87    protected internal override void OnQueryCursor(QueryCursorEventArgs e)
88    {
89      if (LinkIsClickable()) {
90        e.Handled = true;
91        e.Cursor = Cursors.Hand;
92      }
93    }
94   
95    /// <inheritdoc/>
96    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes",
97                                                     Justification = "I've seen Process.Start throw undocumented exceptions when the mail client / web browser is installed incorrectly")]
98    protected internal override void OnMouseDown(MouseButtonEventArgs e)
99    {
100      if (e.ChangedButton == MouseButton.Left && !e.Handled && LinkIsClickable()) {
101        RequestNavigateEventArgs args = new RequestNavigateEventArgs(this.NavigateUri, this.TargetName);
102        args.RoutedEvent = Hyperlink.RequestNavigateEvent;
103        FrameworkElement element = e.Source as FrameworkElement;
104        if (element != null) {
105          // allow user code to handle the navigation request
106          element.RaiseEvent(args);
107        }
108        if (!args.Handled) {
109          try {
110            Process.Start(this.NavigateUri.ToString());
111          } catch {
112            // ignore all kinds of errors during web browser start
113          }
114        }
115        e.Handled = true;
116      }
117    }
118   
119    /// <inheritdoc/>
120    protected override VisualLineText CreateInstance(int length)
121    {
122      return new VisualLineLinkText(ParentVisualLine, length) {
123        NavigateUri = this.NavigateUri,
124        TargetName = this.TargetName,
125        RequireControlModifierForClick = this.RequireControlModifierForClick
126      };
127    }
128  }
129}
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