97 lines
2.4 KiB
C#
97 lines
2.4 KiB
C#
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
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using System;
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using System.Windows;
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using System.Windows.Controls;
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using ICSharpCode.AvalonEdit.Utils;
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namespace ICSharpCode.AvalonEdit.CodeCompletion
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{
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/// <summary>
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/// The list box used inside the CompletionList.
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/// </summary>
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public class CompletionListBox : ListBox
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{
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internal ScrollViewer scrollViewer;
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/// <inheritdoc/>
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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// Find the scroll viewer:
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scrollViewer = null;
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if (this.VisualChildrenCount > 0) {
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Border border = this.GetVisualChild(0) as Border;
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if (border != null)
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scrollViewer = border.Child as ScrollViewer;
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}
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}
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/// <summary>
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/// Gets the number of the first visible item.
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/// </summary>
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public int FirstVisibleItem {
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get {
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if (scrollViewer == null || scrollViewer.ExtentHeight == 0) {
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return 0;
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} else {
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return (int)(this.Items.Count * scrollViewer.VerticalOffset / scrollViewer.ExtentHeight);
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}
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}
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set {
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value = value.CoerceValue(0, this.Items.Count - this.VisibleItemCount);
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if (scrollViewer != null) {
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scrollViewer.ScrollToVerticalOffset((double)value / this.Items.Count * scrollViewer.ExtentHeight);
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}
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}
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}
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/// <summary>
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/// Gets the number of visible items.
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/// </summary>
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public int VisibleItemCount {
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get {
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if (scrollViewer == null || scrollViewer.ExtentHeight == 0) {
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return 10;
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} else {
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return Math.Max(
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3,
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(int)Math.Ceiling(this.Items.Count * scrollViewer.ViewportHeight
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/ scrollViewer.ExtentHeight));
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}
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}
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}
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/// <summary>
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/// Removes the selection.
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/// </summary>
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public void ClearSelection()
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{
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this.SelectedIndex = -1;
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}
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/// <summary>
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/// Selects the item with the specified index and scrolls it into view.
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/// </summary>
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public void SelectIndex(int index)
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{
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if (index >= this.Items.Count)
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index = this.Items.Count - 1;
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if (index < 0)
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index = 0;
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this.SelectedIndex = index;
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this.ScrollIntoView(this.SelectedItem);
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}
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/// <summary>
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/// Centers the view on the item with the specified index.
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/// </summary>
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public void CenterViewOn(int index)
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{
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this.FirstVisibleItem = index - VisibleItemCount / 2;
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}
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}
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}
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