Question

我想在richtextbox中为每个相同的单词着色。我可以为一行但不在多行上。防爆。欢迎“用户”.....

我希望用户这个词在它所在的每一行都是一个精确的颜色。这是我到目前为止所得到的：

RichTextBox1.Text = "Welcome "
RichTextBox1.Select(RichTextBox1.TextLength, 0)
RichTextBox1.SelectionColor = My.Settings.color
RichTextBox1.AppendText(My.Settings.username)
RichTextBox1.SelectionColor = Color.Black
RichTextBox1.AppendText(" ........." + vbCrLf)

它在form.load上，试图穿上richtextbox.textchange，但它只是为最后一个“用户”字着色，而其他字是黑色。提前谢谢。

Answer 1

使用模块，您可以这样做：

Imports System.Runtime.CompilerServices

Module Utility

<Extension()>
Sub HighlightText(ByVal myRtb As RichTextBox, ByVal word As String, ByVal color As Color)
    If word = String.Empty Then Return
    Dim index As Integer, s_start As Integer = myRtb.SelectionStart, startIndex As Integer = 0
    While(__InlineAssignHelper(index, myRtb.Text.IndexOf(word, startIndex))) <> -1
        myRtb.[Select](index, word.Length)
        myRtb.SelectionColor = color
        startIndex = index + word.Length
    End While

    myRtb.SelectionStart = s_start
    myRtb.SelectionLength = 0
    myRtb.SelectionColor = Color.Black
End Sub

<Obsolete("Please refactor code that uses this function, it is a simple work-around to simulate inline assignment in VB!")>
Private Shared Function __InlineAssignHelper(Of T)(ByRef target As T, value As T) As T
    target = value
    Return value
End Function
End Module

或者，你也可以使用这个，因为它可以让你同时突出显示多个单词：

 Private Sub HighlightWords(ByVal words() As String)
     Private Sub HighlightWords(ByVal words() As String)
    For Each word As String In words
        Dim startIndex As Integer = 0

        While (startIndex < rtb1.TextLength)
            Dim wordStartIndex As Integer = rtb1.Find(word, startIndex, RichTextBoxFinds.None)
            If (wordStartIndex <> -1) Then
                rtb1.SelectionStart = wordStartIndex
                rtb1.SelectionLength = word.Length
                rtb1.SelectionBackColor = System.Drawing.Color.Black
            Else
                Exit While
            End If

            startIndex += wordStartIndex + word.Length
        End While

    Next
End Sub

Source希望这有助于：）

Answer 2

这是一个简单的类，它为RichTextBox和TextBox控件启用多个文本选择和突出显示您可以将此类的多个实例用于不同的控件。

您可以将选择/突出显示的单词添加到列表中，并指定用于选择和/或突出显示文本的颜色。

Dim ListOfWords As WordList = New WordList(RichTextBox1)

ListOfWords.AddRange({"Word1", "Word2"})
ListOfWords.SelectionColor = Color.LightBlue
ListOfWords.HighLightColor = Color.Yellow

这些是集体诉讼的视觉结果：

在示例中，单词列表使用以下内容填充：

Dim Patterns As String() = TextBox1.Text.Split(Chr(32))
ListOfWords.AddRange(Patterns)

在可视示例中，Class以这种方式配置：

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    Dim Patterns As String() = TextBox1.Text.Split(Chr(32))

    Dim ListOfWords As WordList = New WordList(RichTextBox1)
    ListOfWords.AddRange(Patterns)
    ListOfWords.SelectionColor = Color.LightBlue
    ListOfWords.HighLightColor = Color.Yellow

    If RadioButton1.Checked = True Then
        ListOfWords.WordsSelect()
    ElseIf RadioButton2.Checked Then
        ListOfWords.WordsHighLight()
    Else
        ListOfWords.DeselectAll()
    End If

End Sub

这是用于生成选择和高光的类：

Imports System.Drawing.Text
Imports System.Text.RegularExpressions

Class WordList
    Private TextRendererFlags As TextFormatFlags = TextFormatFlags.Left Or
                                 TextFormatFlags.Top Or TextFormatFlags.NoPadding Or
                                 TextFormatFlags.WordBreak Or TextFormatFlags.TextBoxControl

    Private _Control As RichTextBox = Nothing
    Private Words As List(Of Word)

    Public Sub New(ByVal RefControl As RichTextBox)
        Me._Control = RefControl
        Me.Words = New List(Of Word)
        Me.ProtectSelection = False
    End Sub

    Public Property ProtectSelection As Boolean
    Public Property HighLightColor As Color
    Public Property SelectionColor As Color

    Public Sub Add(NewWord As String)
        Me.Words.Add(New Word() With {.Word = NewWord, .Indexes = GetWordIndexes(NewWord)})
    End Sub

    Public Sub AddRange(NewWords As String())
        For Each WordItem As String In NewWords
            Me.Words.Add(New Word() With {.Word = WordItem, .Indexes = GetWordIndexes(WordItem)})
        Next
    End Sub
    Private Function GetWordIndexes(Word As String) As List(Of Integer)
        Return Regex.Matches(Me._Control.Text, Word).
                     Cast(Of Match)().
                     Select(Function(chr) chr.Index).ToList()
    End Function

    Public Sub DeselectAll()
        If Me._Control IsNot Nothing Then
            Me._Control.SelectAll()
            Me._Control.SelectionBackColor = Me._Control.BackColor
            Me._Control.Update()
        End If
    End Sub

    Public Sub WordsHighLight()
        If Me.Words.Count > 0 Then
            For Each WordItem As Word In Me.Words
                For Each Position As Integer In WordItem.Indexes
                    Dim _P As Point = Me._Control.GetPositionFromCharIndex(Position)
                    TextRenderer.DrawText(Me._Control.CreateGraphics(), WordItem.Word,
                                          Me._Control.Font, _P, Me._Control.ForeColor,
                                          Me.HighLightColor, TextRendererFlags)
                Next
            Next
        End If
    End Sub

    Public Sub WordsSelect()
        Me.DeselectAll()
        If Me.Words.Count > 0 Then
            For Each WordItem As Word In Me.Words
                For Each Position As Integer In WordItem.Indexes
                    Me._Control.Select(Position, WordItem.Word.Length)
                    Me._Control.SelectionColor = Me._Control.ForeColor
                    Me._Control.SelectionBackColor = Me.SelectionColor
                    Me._Control.SelectionProtected = Me.ProtectSelection
                Next
            Next
        End If
    End Sub

    Class Word
        Property Word As String
        Property Indexes As List(Of Integer)
    End Class

End Class

在每个richtextbox行VB中为特定单词着色

2 个答案: