我正在使用WPF richtextbox为文本框中提供的代码创建语法高亮显示。我想让它在我输入时自动调整富文本框,使用线程计时器我重置富文本框的内容。我试图将光标保持在原来的位置。在解析期间我没有丢失任何文本字符(换行符除外)。我不知道如何将插入位置保留在用户将其留在文本中的位置。它默认为文档的末尾。
我尝试将当前插入符号位置存储在文本中,然后在我进行更改后将其设置为文档,但是我收到的错误是“无法将CaretPosition设置为在RichTextBox之外”。所以我将插入位置设置在文档的底部。
WPF,VB.net,.net Framework 4.0
这是代码。
Public Sub FormatText()
If IsNothing(rtfContent.Document) Then
Exit Sub
End If
Me.rtfContent.IsEnabled = False
Me.rtfContent.Refresh()
Me.Refresh()
System.Threading.Thread.Sleep(50)
Dim curRange As TextRange = New TextRange(rtfContent.Document.ContentStart, rtfContent.CaretPosition)
Dim caretBefore As TextPointer = rtfContent.CaretPosition
caretBefore = New TextRange(caretBefore, caretBefore.DocumentEnd).Start
Dim caretBeforeOffset As Integer = rtfContent.Document.ContentStart.GetOffsetToPosition(caretBefore)
Dim docRange As TextRange = New TextRange(rtfContent.Document.ContentStart, rtfContent.Document.ContentEnd)
docRange.ClearAllProperties()
Dim myText As String = docRange.Text
Dim Lines As List(Of String) = Split(myText, vbCrLf).ToList
Dim MyBlocks As New List(Of Block)
Dim count As Integer = 1
MyVars.Clear()
myText = ""
For Each Line In Lines
If count = Lines.Count Then
Exit For
End If
If Mid(Line, 1, 1) = "$" Then
Dim words As String() = Split(Line, " ", 2)
MyVars.Add(words(0))
myText &= "<Paragraph Margin=""0,0,0,0"" Padding=""0,0,0,2"">" & Line & "</Paragraph>"
ElseIf Mid(Line, 1, 1) = "#" Then
myText &= "<Paragraph Margin=""0,0,0,0"" Padding=""0,0,0,2""><Run Foreground=""#FFFFA500"">" & Line & "</Run></Paragraph>"
Else
myText &= "<Paragraph Margin=""0,0,0,0"" Padding=""0,0,0,2"">" & Line & "</Paragraph>"
End If
count += 1
Next
myText = Regex.Replace(myText, "\$(\w*)", "<Run Foreground=""#FFFF0000"">$$$1</Run>")
For Each var In MyVars
myText = Regex.Replace(myText, "<Run Foreground=""#FFFF0000"">\" & var & "</Run>", "<Run Foreground=""#FF32CD32"">" & var & "</Run>")
Next
myText = myText.Replace("copy", "<Run Foreground=""#FF87CEFA"">copy</Run>")
myText = myText.Replace("delete", "<Run Foreground=""#FF87CEFA"">delete</Run>")
myText = myText.Replace("output", "<Run Foreground=""#FF87CEFA"">output</Run>")
myText = myText.Replace("clear", "<Run Foreground=""#FF87CEFA"">clear</Run>")
myText = "<FlowDocument PagePadding=""5,0,5,0"" AllowDrop=""True"" NumberSubstitution.CultureSource=""User"" xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation"">" & myText & "</FlowDocument>"
Me.rtfContent.Document.Blocks.Clear()
Me.rtfContent.Document = TryCast(XamlReader.Parse(myText), FlowDocument)
caretBefore = caretBefore.DocumentStart.GetPositionAtOffset(caretBeforeOffset, LogicalDirection.Forward)
Try
Me.rtfContent.CaretPosition = caretBefore
Catch
Me.rtfContent.CaretPosition = rtfContent.Document.ContentEnd
End Try
Me.rtfContent.IsEnabled = True
Me.rtfContent.Refresh()
Me.Refresh()
End Sub
答案 0 :(得分:1)
我有一个可能会有所帮助的想法。 Point GetPositionFromCharIndex(int index)
,PointToClient
和PointToScreen
函数有帮助吗?您可以存储鼠标光标所在的char索引,并在生成代码后将其放回上述位置。您可以找到这些函数的使用here。