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Highlight the search term in the options page
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123 changes: 123 additions & 0 deletions
123
src/VisualStudio/Core/Impl/Options/OptionPageSearchHandler.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
|
|
||
| using System.Diagnostics; | ||
| using System.Windows; | ||
| using System; | ||
| using System.Windows.Controls; | ||
| using System.Windows.Documents; | ||
| using System.Windows.Input; | ||
| using System.Windows.Media; | ||
|
|
||
| namespace Microsoft.VisualStudio.LanguageServices.Implementation.Options | ||
| { | ||
| internal class OptionPageSearchHandler | ||
| { | ||
| public static readonly Brush HighlightForeground = SystemColors.HighlightTextBrush; | ||
| public static readonly Brush HighlightBackground = SystemColors.HighlightBrush; | ||
|
|
||
| private readonly ContentControl _control; | ||
| private readonly string _originalContent; | ||
| private readonly int _accessKeyIndex; | ||
| private readonly string _content; | ||
|
|
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| public OptionPageSearchHandler(ContentControl control, string originalContent) | ||
| { | ||
| _control = control; | ||
| _originalContent = originalContent; | ||
|
|
||
| // Currently only support one access key, and no underscores | ||
| Debug.Assert(_originalContent.Split('_').Length <= 2); | ||
|
|
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| _accessKeyIndex = _originalContent.IndexOf('_'); | ||
|
|
||
| // We strip out the access key so it doesn't interupt search, and because we have to handle displaying it ourselves anyway. | ||
| // Since we strip it out, we also don't need to worry about the access key being the character after the underscore | ||
| _content = _originalContent.Replace("_", ""); | ||
| } | ||
|
|
||
| public bool TryHighlightSearchString(string searchTerm) | ||
| { | ||
| var index = _content.IndexOf(searchTerm, StringComparison.CurrentCultureIgnoreCase); | ||
| if (index == -1 || string.IsNullOrWhiteSpace(searchTerm)) | ||
| { | ||
| if (_accessKeyIndex != -1) | ||
| { | ||
| // Unregister and let the content control handle access keys | ||
| AccessKeyManager.Unregister(_content[_accessKeyIndex].ToString(), _control); | ||
| } | ||
|
|
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| _control.Content = _originalContent; | ||
| return false; | ||
| } | ||
|
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| if (_accessKeyIndex != -1) | ||
| { | ||
| // Because we are overriding the content entirely, we have to handle access keys | ||
| AccessKeyManager.Register(_content[_accessKeyIndex].ToString(), _control); | ||
| } | ||
|
|
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| _control.Content = CreateHighlightingTextRun(index, searchTerm.Length); | ||
| return true; | ||
| } | ||
|
|
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| public void EnsureVisible() | ||
| { | ||
| _control.BringIntoView(); | ||
| } | ||
|
|
||
| private TextBlock CreateHighlightingTextRun(int highlightStart, int length) | ||
| { | ||
| var textBlock = new TextBlock(); | ||
| AddTextRun(textBlock, 0, highlightStart, highlight: false); | ||
| AddTextRun(textBlock, highlightStart, length, highlight: true); | ||
|
|
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| var highlightEnd = highlightStart + length; | ||
| AddTextRun(textBlock, highlightEnd, _content.Length - highlightEnd, highlight: false); | ||
|
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| return textBlock; | ||
| } | ||
|
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| private void AddTextRun(TextBlock textBlock, int start, int length, bool highlight) | ||
| { | ||
| if (length <= 0) | ||
| return; | ||
|
|
||
| // If the access key is in this run, then we actually need to add three runs | ||
| if (_accessKeyIndex >= start && _accessKeyIndex < start + length) | ||
| { | ||
| var firstPartLength = _accessKeyIndex - start; | ||
| var lastPartLength = length - firstPartLength - 1; | ||
|
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| if (firstPartLength > 0) | ||
| textBlock.Inlines.Add(CreateRun(start, firstPartLength, highlight, underline: false)); | ||
|
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| textBlock.Inlines.Add(CreateRun(_accessKeyIndex, 1, highlight, underline: true)); | ||
|
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| if (lastPartLength > 0) | ||
| textBlock.Inlines.Add(CreateRun(_accessKeyIndex + 1, lastPartLength, highlight, underline: false)); | ||
| } | ||
| else | ||
| { | ||
| textBlock.Inlines.Add(CreateRun(start, length, highlight, underline: false)); | ||
| } | ||
| } | ||
|
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| private Run CreateRun(int start, int length, bool highlight, bool underline) | ||
| { | ||
| var run = new Run(_content.Substring(start, length)); | ||
|
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| if (highlight) | ||
| { | ||
| run.Background = HighlightBackground; | ||
| run.Foreground = HighlightForeground; | ||
| } | ||
|
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| if (underline) | ||
| run.TextDecorations.Add(TextDecorations.Underline); | ||
|
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||
| return run; | ||
| } | ||
| } | ||
| } |
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