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Passo a passo: Realçar texto

Você pode adicionar efeitos visuais diferentes para o editor, criando componentes de Managed Extensibility Framework (MEF). Esta explicação passo a passo mostra como realçar todas as ocorrências da palavra atual em um arquivo de texto. Se uma palavra ocorre mais de uma vez em um arquivo de texto e posicione o cursor em uma ocorrência, cada ocorrência é realçada.

Pré-requisitos

Para concluir este passo a passo, você deve instalar o SDL do Visual Studio 2010.

Dica

Para obter mais informações sobre o SDK de Visual Studio, consulte Ampliando a visão geral de Visual Studio.Para descobrir como fazer o download do SDK do Visual Studio, consulte Visual Studio extensibilidade Developer Center no site do MSDN.

Criando um projeto MEF

Para criar um projeto MEF

  1. Crie um projeto do classificador de Editor. Nomeie a solução HighlightWordTest.

  2. Abra o arquivo de source.extension.vsixmanifest no Editor de VSIX de manifesto.

  3. Certifique-se de que o Content título contém um tipo de conteúdo do componente MEF e que o Path for definido como HighlightWordTest.dll.

  4. Salve e feche o source.extension.vsixmanifest.

  5. Exclua os arquivos de classe existentes.

Definindo um TextMarkerTag

A primeira etapa no realce o texto é a subclasse TextMarkerTag e definir sua aparência.

Para definir um TextMarkerTag e um MarkerFormatDefinition

  1. Adicionar um arquivo de classe e o nome HighlightWordTag.

  2. Importe os namespaces a seguir.

    Imports System
    Imports System.Collections.Generic
    Imports System.ComponentModel.Composition
    Imports System.Linq
    Imports System.Threading
    Imports System.Windows.Media
    Imports Microsoft.VisualStudio.Text
    Imports Microsoft.VisualStudio.Text.Classification
    Imports Microsoft.VisualStudio.Text.Editor
    Imports Microsoft.VisualStudio.Text.Operations
    Imports Microsoft.VisualStudio.Text.Tagging
    Imports Microsoft.VisualStudio.Utilities
    
    using System;
    using System.Collections.Generic;
    using System.ComponentModel.Composition;
    using System.Linq;
    using System.Threading;
    using System.Windows.Media;
    using Microsoft.VisualStudio.Text;
    using Microsoft.VisualStudio.Text.Classification;
    using Microsoft.VisualStudio.Text.Editor;
    using Microsoft.VisualStudio.Text.Operations;
    using Microsoft.VisualStudio.Text.Tagging;
    using Microsoft.VisualStudio.Utilities;
    
  3. Crie uma classe que herda de TextMarkerTag e o nome de HighlightWordTag.

    Friend Class HighlightWordTag
        Inherits TextMarkerTag
    
    internal class HighlightWordTag : TextMarkerTag
    
  4. Criar uma segunda classe que herda de MarkerFormatDefinitione nomeie-o como HighlightWordFormatDefinition. Para usar essa definição de formato para sua marca, você deve exportá-lo com os seguintes atributos:

    • NameAttribute: marcas usam esta opção para fazer referência a esse formato

    • UserVisibleAttribute: isso faz com que o formato deve aparecer na interface de usuário

    <Export(GetType(EditorFormatDefinition))>
    <Name("MarkerFormatDefinition/HighlightWordFormatDefinition")>
    <UserVisible(True)>
    Friend Class HighlightWordFormatDefinition
        Inherits MarkerFormatDefinition
    
    [Export(typeof(EditorFormatDefinition))]
    [Name("MarkerFormatDefinition/HighlightWordFormatDefinition")]
    [UserVisible(true)]
    internal class HighlightWordFormatDefinition : MarkerFormatDefinition
    
  5. No construtor para HighlightWordFormatDefinition, defina o seu nome de exibição e a aparência. A propriedade Background define a cor de preenchimento, enquanto a propriedade Foreground define a cor da borda.

    Public Sub New()
        Me.BackgroundColor = Colors.LightBlue
        Me.ForegroundColor = Colors.DarkBlue
        Me.DisplayName = "Highlight Word" 
        Me.ZOrder = 5
    End Sub
    
    public HighlightWordFormatDefinition()
    {
        this.BackgroundColor = Colors.LightBlue;
        this.ForegroundColor = Colors.DarkBlue;
        this.DisplayName = "Highlight Word";
        this.ZOrder = 5;
    }
    
  6. No construtor para HighlightWordTag, passe o nome da definição de formato que você acabou de criar.

    Public Sub New()
        MyBase.New("MarkerFormatDefinition/HighlightWordFormatDefinition")
    End Sub
    
    public HighlightWordTag() : base("MarkerFormatDefinition/HighlightWordFormatDefinition") { }
    

A implementação de um ITagger

A próxima etapa é implementar a ITagger interface. Essa interface atribui um buffer de texto fornecido, as marcas que fornecem o realce do texto e outros efeitos visuais.

Para implementar um tagger

  1. Criar uma classe que implementa ITagger do tipo HighlightWordTage o nome de HighlightWordTagger.

    Friend Class HighlightWordTagger
        Implements ITagger(Of HighlightWordTag)
    
    internal class HighlightWordTagger : ITagger<HighlightWordTag>
    
  2. Adicione os seguintes campos particulares e propriedades para a classe:

    Private _View As ITextView
    Private Property View() As ITextView
        Get 
            Return _View
        End Get 
        Set(ByVal value As ITextView)
            _View = value
        End Set 
    End Property 
    Private _SourceBuffer As ITextBuffer
    Private Property SourceBuffer() As ITextBuffer
        Get 
            Return _SourceBuffer
        End Get 
        Set(ByVal value As ITextBuffer)
            _SourceBuffer = value
        End Set 
    End Property 
    Private _TextSearchService As ITextSearchService
    Private Property TextSearchService() As ITextSearchService
        Get 
            Return _TextSearchService
        End Get 
        Set(ByVal value As ITextSearchService)
            _TextSearchService = value
        End Set 
    End Property 
    Private _TextStructureNavigator As ITextStructureNavigator
    Private Property TextStructureNavigator() As ITextStructureNavigator
        Get 
            Return _TextStructureNavigator
        End Get 
        Set(ByVal value As ITextStructureNavigator)
            _TextStructureNavigator = value
        End Set 
    End Property 
    Private _WordSpans As NormalizedSnapshotSpanCollection
    Private Property WordSpans() As NormalizedSnapshotSpanCollection
        Get 
            Return _WordSpans
        End Get 
        Set(ByVal value As NormalizedSnapshotSpanCollection)
            _WordSpans = value
        End Set 
    End Property 
    Private _CurrentWord As System.Nullable(Of SnapshotSpan)
    Private Property CurrentWord() As System.Nullable(Of SnapshotSpan)
        Get 
            Return _CurrentWord
        End Get 
        Set(ByVal value As System.Nullable(Of SnapshotSpan))
            _CurrentWord = value
        End Set 
    End Property 
    Private _RequestedPoint As SnapshotPoint
    Private Property RequestedPoint() As SnapshotPoint
        Get 
            Return _RequestedPoint
        End Get 
        Set(ByVal value As SnapshotPoint)
            _RequestedPoint = value
        End Set 
    End Property 
    Private updateLock As New Object()
    
    ITextView View { get; set; }
    ITextBuffer SourceBuffer { get; set; }
    ITextSearchService TextSearchService { get; set; }
    ITextStructureNavigator TextStructureNavigator { get; set; }
    NormalizedSnapshotSpanCollection WordSpans { get; set; }
    SnapshotSpan? CurrentWord { get; set; }
    SnapshotPoint RequestedPoint { get; set; }
    object updateLock = new object();
    
  3. Adicionar um construtor que inicializa as propriedades listadas anteriormente e adiciona LayoutChanged e PositionChanged manipuladores de eventos.

    Public Sub New(ByVal view As ITextView, ByVal sourceBuffer As ITextBuffer, ByVal textSearchService As ITextSearchService, ByVal textStructureNavigator As ITextStructureNavigator)
        Me.View = view
        Me.SourceBuffer = sourceBuffer
        Me.TextSearchService = textSearchService
        Me.TextStructureNavigator = textStructureNavigator
        Me.WordSpans = New NormalizedSnapshotSpanCollection()
        Me.CurrentWord = Nothing 
        AddHandler Me.View.Caret.PositionChanged, AddressOf CaretPositionChanged
        AddHandler Me.View.LayoutChanged, AddressOf ViewLayoutChanged
    End Sub
    
    public HighlightWordTagger(ITextView view, ITextBuffer sourceBuffer, ITextSearchService textSearchService,
    ITextStructureNavigator textStructureNavigator)
    {
        this.View = view;
        this.SourceBuffer = sourceBuffer;
        this.TextSearchService = textSearchService;
        this.TextStructureNavigator = textStructureNavigator;
        this.WordSpans = new NormalizedSnapshotSpanCollection();
        this.CurrentWord = null;
        this.View.Caret.PositionChanged += CaretPositionChanged;
        this.View.LayoutChanged += ViewLayoutChanged;
    }
    
  4. Os manipuladores de eventos que chamam o UpdateAtCaretPosition método.

    Private Sub ViewLayoutChanged(ByVal sender As Object, ByVal e As TextViewLayoutChangedEventArgs)
        ' If a new snapshot wasn't generated, then skip this layout 
        If e.NewSnapshot IsNot e.OldSnapshot Then
            UpdateAtCaretPosition(View.Caret.Position)
        End If 
    End Sub 
    
    Private Sub CaretPositionChanged(ByVal sender As Object, ByVal e As CaretPositionChangedEventArgs)
        UpdateAtCaretPosition(e.NewPosition)
    End Sub
    
    void ViewLayoutChanged(object sender, TextViewLayoutChangedEventArgs e)
    {
        // If a new snapshot wasn't generated, then skip this layout 
        if (e.NewSnapshot != e.OldSnapshot)
        {
            UpdateAtCaretPosition(View.Caret.Position);
        }
    }
    
    void CaretPositionChanged(object sender, CaretPositionChangedEventArgs e)
    {
        UpdateAtCaretPosition(e.NewPosition);
    }
    
  5. Você também deve adicionar um TagsChanged o evento que será chamado pelo método update.

    Public Event TagsChanged(ByVal sender As Object, ByVal e As SnapshotSpanEventArgs) _
        Implements ITagger(Of HighlightWordTag).TagsChanged
    
    public event EventHandler<SnapshotSpanEventArgs> TagsChanged;
    
  6. O UpdateAtCaretPosition() método localiza todas as palavras no buffer de texto que é idêntico à palavra onde o cursor está posicionado e constrói uma lista de SnapshotSpan objetos que correspondem às ocorrências da palavra. Em seguida, chama SynchronousUpdate, que gera a TagsChanged evento.

    Private Sub UpdateAtCaretPosition(ByVal caretPosition As CaretPosition)
        Dim point As System.Nullable(Of SnapshotPoint) = caretPosition.Point.GetPoint(SourceBuffer, caretPosition.Affinity)
    
        If Not point.HasValue Then 
            Exit Sub 
        End If 
    
        ' If the new caret position is still within the current word (and on the same snapshot), we don't need to check it 
        If CurrentWord.HasValue AndAlso CurrentWord.Value.Snapshot Is View.TextSnapshot AndAlso point.Value > CurrentWord.Value.Start AndAlso point.Value < CurrentWord.Value.[End] Then 
            Exit Sub 
        End If
    
        RequestedPoint = point.Value
        UpdateWordAdornments()
    End Sub 
    
    Private Sub UpdateWordAdornments()
        Dim currentRequest As SnapshotPoint = RequestedPoint
        Dim wordSpans As New List(Of SnapshotSpan)()
        'Find all words in the buffer like the one the caret is on 
        Dim word As TextExtent = TextStructureNavigator.GetExtentOfWord(currentRequest)
        Dim foundWord As Boolean = True 
        'If we've selected something not worth highlighting, we might have missed a "word" by a little bit 
        If Not WordExtentIsValid(currentRequest, word) Then 
            'Before we retry, make sure it is worthwhile 
            If word.Span.Start <> currentRequest OrElse currentRequest = currentRequest.GetContainingLine().Start OrElse Char.IsWhiteSpace((currentRequest - 1).GetChar()) Then
                foundWord = False 
            Else 
                ' Try again, one character previous.  
                'If the caret is at the end of a word, pick up the word.
                word = TextStructureNavigator.GetExtentOfWord(currentRequest - 1)
    
                'If the word still isn't valid, we're done 
                If Not WordExtentIsValid(currentRequest, word) Then
                    foundWord = False 
                End If 
            End If 
        End If 
    
        If Not foundWord Then 
            'If we couldn't find a word, clear out the existing markers
            SynchronousUpdate(currentRequest, New NormalizedSnapshotSpanCollection(), Nothing)
            Exit Sub 
        End If 
    
        Dim currentWord__1 As SnapshotSpan = word.Span
        'If this is the current word, and the caret moved within a word, we're done. 
        If CurrentWord.HasValue AndAlso currentWord__1 = CurrentWord Then 
            Exit Sub 
        End If 
    
        'Find the new spans 
        Dim findData As New FindData(currentWord__1.GetText(), currentWord__1.Snapshot)
        findData.FindOptions = FindOptions.WholeWord Or FindOptions.MatchCase
    
        wordSpans.AddRange(TextSearchService.FindAll(findData))
    
        'If another change hasn't happened, do a real update 
        If currentRequest = RequestedPoint Then
            SynchronousUpdate(currentRequest, New NormalizedSnapshotSpanCollection(wordSpans), currentWord__1)
        End If 
    End Sub 
    Private Shared Function WordExtentIsValid(ByVal currentRequest As SnapshotPoint, ByVal word As TextExtent) As Boolean 
        Return word.IsSignificant AndAlso currentRequest.Snapshot.GetText(word.Span).Any(Function(c) Char.IsLetter(c))
    End Function
    
    void UpdateAtCaretPosition(CaretPosition caretPosition)
    {
        SnapshotPoint? point = caretPosition.Point.GetPoint(SourceBuffer, caretPosition.Affinity);
    
        if (!point.HasValue)
            return;
    
        // If the new caret position is still within the current word (and on the same snapshot), we don't need to check it 
        if (CurrentWord.HasValue
            && CurrentWord.Value.Snapshot == View.TextSnapshot
            && point.Value >= CurrentWord.Value.Start
            && point.Value <= CurrentWord.Value.End)
        {
            return;
        }
    
        RequestedPoint = point.Value;
        UpdateWordAdornments();
    }
    
    void UpdateWordAdornments()
    {
        SnapshotPoint currentRequest = RequestedPoint;
        List<SnapshotSpan> wordSpans = new List<SnapshotSpan>();
        //Find all words in the buffer like the one the caret is on
        TextExtent word = TextStructureNavigator.GetExtentOfWord(currentRequest);
        bool foundWord = true;
        //If we've selected something not worth highlighting, we might have missed a "word" by a little bit
        if (!WordExtentIsValid(currentRequest, word))
        {
            //Before we retry, make sure it is worthwhile 
            if (word.Span.Start != currentRequest
                 || currentRequest == currentRequest.GetContainingLine().Start
                 || char.IsWhiteSpace((currentRequest - 1).GetChar()))
            {
                foundWord = false;
            }
            else
            {
                // Try again, one character previous.  
                //If the caret is at the end of a word, pick up the word.
                word = TextStructureNavigator.GetExtentOfWord(currentRequest - 1);
    
                //If the word still isn't valid, we're done 
                if (!WordExtentIsValid(currentRequest, word))
                    foundWord = false;
            }
        }
    
        if (!foundWord)
        {
            //If we couldn't find a word, clear out the existing markers
            SynchronousUpdate(currentRequest, new NormalizedSnapshotSpanCollection(), null);
            return;
        }
    
        SnapshotSpan currentWord = word.Span;
        //If this is the current word, and the caret moved within a word, we're done. 
        if (CurrentWord.HasValue && currentWord == CurrentWord)
            return;
    
        //Find the new spans
        FindData findData = new FindData(currentWord.GetText(), currentWord.Snapshot);
        findData.FindOptions = FindOptions.WholeWord | FindOptions.MatchCase;
    
        wordSpans.AddRange(TextSearchService.FindAll(findData));
    
        //If another change hasn't happened, do a real update 
        if (currentRequest == RequestedPoint)
            SynchronousUpdate(currentRequest, new NormalizedSnapshotSpanCollection(wordSpans), currentWord);
    }
    static bool WordExtentIsValid(SnapshotPoint currentRequest, TextExtent word)
    {
        return word.IsSignificant
            && currentRequest.Snapshot.GetText(word.Span).Any(c => char.IsLetter(c));
    }
    
  7. O SynchronousUpdate realiza uma atualização síncrona na WordSpans e CurrentWord propriedades e gera a TagsChanged evento.

    Private Sub SynchronousUpdate(ByVal currentRequest As SnapshotPoint, ByVal newSpans As NormalizedSnapshotSpanCollection, ByVal newCurrentWord As System.Nullable(Of SnapshotSpan))
        SyncLock updateLock
            If currentRequest <> RequestedPoint Then 
                Exit Sub 
            End If
    
            WordSpans = newSpans
            CurrentWord = newCurrentWord
    
            RaiseEvent TagsChanged(Me, New SnapshotSpanEventArgs(New SnapshotSpan(SourceBuffer.CurrentSnapshot, 0, SourceBuffer.CurrentSnapshot.Length)))
        End SyncLock 
    End Sub
    
    void SynchronousUpdate(SnapshotPoint currentRequest, NormalizedSnapshotSpanCollection newSpans, SnapshotSpan? newCurrentWord)
    {
        lock (updateLock)
        {
            if (currentRequest != RequestedPoint)
                return;
    
            WordSpans = newSpans;
            CurrentWord = newCurrentWord;
    
            var tempEvent = TagsChanged;
            if (tempEvent != null)
                tempEvent(this, new SnapshotSpanEventArgs(new SnapshotSpan(SourceBuffer.CurrentSnapshot, 0, SourceBuffer.CurrentSnapshot.Length)));
        }
    }
    
  8. Você deve implementar a GetTags método. Este método usa uma coleção de SnapshotSpan objetos e retorna uma enumeração das extensões de marca.

    C#, implemente esse método como um iterador de rendimento, que permite a avaliação lenta (isto é, de avaliação do conjunto apenas quando os itens individuais são acessados) das marcas. Na Visual Basic, adicionar marcas a uma lista e retornar a lista.

    Aqui o método retorna um TagSpan objeto que tem um "azul" TextMarkerTag, que fornece um plano de fundo azul.

    Public Function GetTags(ByVal spans As NormalizedSnapshotSpanCollection) As IEnumerable(Of ITagSpan(Of HighlightWordTag)) Implements ITagger(Of HighlightWordTag).GetTags
        If CurrentWord Is Nothing Then 
            Return Nothing 
            Exit Function 
        End If 
    
        ' Hold on to a "snapshot" of the word spans and current word, so that we maintain the same 
        ' collection throughout 
        Dim currentWord__1 As SnapshotSpan = CurrentWord.Value
        Dim wordSpans__2 As NormalizedSnapshotSpanCollection = WordSpans
    
        If spans.Count = 0 OrElse WordSpans.Count = 0 Then 
            Return Nothing 
            Exit Function 
        End If 
    
        ' If the requested snapshot isn't the same as the one our words are on, translate our spans to the expected snapshot 
        If spans(0).Snapshot IsNot wordSpans__2(0).Snapshot Then
            wordSpans__2 = New NormalizedSnapshotSpanCollection(wordSpans__2.[Select](Function(span) span.TranslateTo(spans(0).Snapshot, SpanTrackingMode.EdgeExclusive)))
    
            currentWord__1 = currentWord__1.TranslateTo(spans(0).Snapshot, SpanTrackingMode.EdgeExclusive)
        End If 
        'in order to emulate the C# yield return functionality, 
        'create a list and add all the relevant spans to it, then return the list 
        Dim list As List(Of TagSpan(Of HighlightWordTag))
        list = New List(Of TagSpan(Of HighlightWordTag))()
    
        If spans.OverlapsWith(New NormalizedSnapshotSpanCollection(currentWord__1)) Then
            list.Add(New TagSpan(Of HighlightWordTag)(CurrentWord, New HighlightWordTag()))
        End If 
    
        For Each span As SnapshotSpan In NormalizedSnapshotSpanCollection.Overlap(spans, wordSpans__2)
            list.Add(New TagSpan(Of HighlightWordTag)(span, New HighlightWordTag()))
        Next 
        Return List
    End Function
    
    public IEnumerable<ITagSpan<HighlightWordTag>> GetTags(NormalizedSnapshotSpanCollection spans)
    {
        if (CurrentWord == null)
            yield break;
    
        // Hold on to a "snapshot" of the word spans and current word, so that we maintain the same
        // collection throughout
        SnapshotSpan currentWord = CurrentWord.Value;
        NormalizedSnapshotSpanCollection wordSpans = WordSpans;
    
        if (spans.Count == 0 || wordSpans.Count == 0)
            yield break;
    
        // If the requested snapshot isn't the same as the one our words are on, translate our spans to the expected snapshot 
        if (spans[0].Snapshot != wordSpans[0].Snapshot)
        {
            wordSpans = new NormalizedSnapshotSpanCollection(
                wordSpans.Select(span => span.TranslateTo(spans[0].Snapshot, SpanTrackingMode.EdgeExclusive)));
    
            currentWord = currentWord.TranslateTo(spans[0].Snapshot, SpanTrackingMode.EdgeExclusive);
        }
    
        // First, yield back the word the cursor is under (if it overlaps) 
        // Note that we'll yield back the same word again in the wordspans collection; 
        // the duplication here is expected. 
        if (spans.OverlapsWith(new NormalizedSnapshotSpanCollection(currentWord)))
            yield return new TagSpan<HighlightWordTag>(currentWord, new HighlightWordTag());
    
        // Second, yield all the other words in the file 
        foreach (SnapshotSpan span in NormalizedSnapshotSpanCollection.Overlap(spans, wordSpans))
        {
            yield return new TagSpan<HighlightWordTag>(span, new HighlightWordTag());
        }
    }
    

Criar um provedor de Tagger

Para criar sua tagger, você deve implementar um IViewTaggerProvider. Essa classe é uma parte de componente MEF, portanto, você deve definir os atributos corretos para que esta extensão seja reconhecida.

Dica

Para obter mais informações sobre o MEF, consulte Managed Extensibility Framework (MEF).

Para criar um provedor de tagger

  1. Criar uma classe chamada HighlightWordTaggerProvider que implementa IViewTaggerProvidere exportá-lo com um ContentTypeAttribute de "texto" e um TagTypeAttribute de TextMarkerTag.

    <Export(GetType(IViewTaggerProvider))>
    <ContentType("text")>
    <TagType(GetType(TextMarkerTag))>
    Friend Class HighlightWordTaggerProvider
        Implements IViewTaggerProvider
    
    [Export(typeof(IViewTaggerProvider))]
    [ContentType("text")]
    [TagType(typeof(TextMarkerTag))]
    internal class HighlightWordTaggerProvider : IViewTaggerProvider
    
  2. Você deve importar os dois serviços do editor, o ITextSearchService e o ITextStructureNavigatorSelectorService, para criar uma instância de tagger.

    Private _TextSearchService As ITextSearchService
    <Import()> _
    Friend Property TextSearchService() As ITextSearchService
        Get 
            Return _TextSearchService
        End Get 
        Set(ByVal value As ITextSearchService)
            _TextSearchService = value
        End Set 
    End Property 
    
    Private _TextStructureNavigatorSelector As ITextStructureNavigatorSelectorService
    <Import()>
    Friend Property TextStructureNavigatorSelector() As ITextStructureNavigatorSelectorService
        Get 
            Return _TextStructureNavigatorSelector
        End Get 
        Set(ByVal value As ITextStructureNavigatorSelectorService)
            _TextStructureNavigatorSelector = value
        End Set 
    End Property
    
    [Import]
    internal ITextSearchService TextSearchService { get; set; }
    
    [Import]
    internal ITextStructureNavigatorSelectorService TextStructureNavigatorSelector { get; set; }
    
  3. Implementar a CreateTagger``1 método para retornar uma instância de HighlightWordTagger.

    Public Function CreateTagger(Of T As ITag)(ByVal textView As ITextView, ByVal buffer As ITextBuffer) As ITagger(Of T) Implements IViewTaggerProvider.CreateTagger
        'provide highlighting only on the top buffer 
        If textView.TextBuffer IsNot buffer Then 
            Return Nothing 
        End If 
    
        Dim textStructureNavigator As ITextStructureNavigator = TextStructureNavigatorSelector.GetTextStructureNavigator(buffer)
    
        Return TryCast(New HighlightWordTagger(textView, buffer, TextSearchService, textStructureNavigator), ITagger(Of T))
    End Function
    
    public ITagger<T> CreateTagger<T>(ITextView textView, ITextBuffer buffer) where T : ITag
    {
        //provide highlighting only on the top buffer 
        if (textView.TextBuffer != buffer)
            return null;
    
        ITextStructureNavigator textStructureNavigator =
            TextStructureNavigatorSelector.GetTextStructureNavigator(buffer);
    
        return new HighlightWordTagger(textView, buffer, TextSearchService, textStructureNavigator) as ITagger<T>;
    }
    

Criar e testar o código

Para testar esse código, crie a solução de HighlightWordTest e execute-o na instância experimental.

Para criar e testar a solução de HighlightWordTest

  1. Crie a solução.

  2. Ao executar este projeto no depurador, uma segunda instância do Visual Studio é instanciada.

  3. Crie um arquivo de texto e digite algum texto no qual as palavras são repetidas, por exemplo, "Olá Olá Olá".

  4. Posicione o cursor em uma das ocorrências de "hello". Todas as ocorrências devem ser destacadas em azul.

Consulte também

Tarefas

Passo a passo: Vinculação a um tipo de conteúdo a uma extensão de nome de arquivo