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source: branches/Async/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/CodeCompletion/CompletionListBox.cs @ 13401

Last change on this file since 13401 was 11700, checked in by jkarder, 10 years ago

#2077: created branch and added first version

File size: 3.3 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.Windows;
21using System.Windows.Controls;
22using ICSharpCode.AvalonEdit.Utils;
23
24namespace ICSharpCode.AvalonEdit.CodeCompletion
25{
26  /// <summary>
27  /// The list box used inside the CompletionList.
28  /// </summary>
29  public class CompletionListBox : ListBox
30  {
31    internal ScrollViewer scrollViewer;
32   
33    /// <inheritdoc/>
34    public override void OnApplyTemplate()
35    {
36      base.OnApplyTemplate();
37     
38      // Find the scroll viewer:
39      scrollViewer = null;
40      if (this.VisualChildrenCount > 0) {
41        Border border = this.GetVisualChild(0) as Border;
42        if (border != null)
43          scrollViewer = border.Child as ScrollViewer;
44      }
45    }
46   
47    /// <summary>
48    /// Gets the number of the first visible item.
49    /// </summary>
50    public int FirstVisibleItem {
51      get {
52        if (scrollViewer == null || scrollViewer.ExtentHeight == 0) {
53          return 0;
54        } else {
55          return (int)(this.Items.Count * scrollViewer.VerticalOffset / scrollViewer.ExtentHeight);
56        }
57      }
58      set {
59        value = value.CoerceValue(0, this.Items.Count - this.VisibleItemCount);
60        if (scrollViewer != null) {
61          scrollViewer.ScrollToVerticalOffset((double)value / this.Items.Count * scrollViewer.ExtentHeight);
62        }
63      }
64    }
65   
66    /// <summary>
67    /// Gets the number of visible items.
68    /// </summary>
69    public int VisibleItemCount {
70      get {
71        if (scrollViewer == null || scrollViewer.ExtentHeight == 0) {
72          return 10;
73        } else {
74          return Math.Max(
75            3,
76            (int)Math.Ceiling(this.Items.Count * scrollViewer.ViewportHeight
77                              / scrollViewer.ExtentHeight));
78        }
79      }
80    }
81   
82    /// <summary>
83    /// Removes the selection.
84    /// </summary>
85    public void ClearSelection()
86    {
87      this.SelectedIndex = -1;
88    }
89   
90    /// <summary>
91    /// Selects the item with the specified index and scrolls it into view.
92    /// </summary>
93    public void SelectIndex(int index)
94    {
95      if (index >= this.Items.Count)
96        index = this.Items.Count - 1;
97      if (index < 0)
98        index = 0;
99      this.SelectedIndex = index;
100      this.ScrollIntoView(this.SelectedItem);
101    }
102   
103    /// <summary>
104    /// Centers the view on the item with the specified index.
105    /// </summary>
106    public void CenterViewOn(int index)
107    {
108      this.FirstVisibleItem = index - VisibleItemCount / 2;
109    }
110  }
111}
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