FastColoredTextbox 问题滚动文本和定位插入符号

Question

这个问题是关于扩展控件的：FastColoredTextbox 这里：http://www.codeproject.com/Articles/161871/Fast-Colored-TextBox-for-syntax-highlighting

我正在尝试自动向下滚动文本并将文本光标放在附加文本的最后一个字符（我想是文本属性的总长度）。

文本滚动问题

这适用于自动文本滚动：

  Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        FastColoredTextBox1.Text = str
        FastColoredTextBox1.ScrollLeft()
        FastColoredTextBox1.Navigate(FastColoredTextBox1.Lines.Count - 1)
  End Sub

...但我想让它更通用，这不起作用：

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    FastColoredTextBox1.Text = str
End Sub


Private Sub FastColoredTextBox1_TextChanged(sender As Object, e As FastColoredTextBoxNS.TextChangedEventArgs) Handles FastColoredTextBox1.TextChanged
    sender.ScrollLeft()
    sender.Navigate(FastColoredTextBox1.Lines.Count - 1)
End Sub

任何错误或异常，都不起作用，文本不会像第一个示例那样滚动。

键盘光标位置问题

关于文本光标，我已经尝试过了，但也不行：

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    FastColoredTextBox1.Text = str
    FastColoredTextBox1.SelectionStart = FastColoredTextBox1.Text.Length
End Sub

任何错误或异常，都不行。

更新

尝试了@ebyrob 解决方案但不起作用，它不会向下滚动。

Imports FastColoredTextBoxNS

Public Class Form1

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim str As String = String.Empty
        For x As Int32 = 1 To 1000 : str += vbNewLine & x : Next
        FastColoredTextBox1.Text = str
    End Sub

    Private Sub FastColoredTextBox1_TextChanged(sender As Object, e As TextChangedEventArgs) Handles FastColoredTextBox1.TextChanged
        GoEnd()
    End Sub

    Public Sub GoEnd()
        If FastColoredTextBox1.Lines.Count > 0 Then
            FastColoredTextBox1.Selection.Start = New Place(FastColoredTextBox1.Lines(FastColoredTextBox1.Lines.Count - 1).Count, FastColoredTextBox1.Lines.Count - 1)
        Else
            FastColoredTextBox1.Selection.Start = New Place(0, 0)
        End If
        FastColoredTextBox1.DoCaretVisible()
    End Sub

End Class

更新二

@ebyrob 代码仅在我始终在附加文本后调用“GoEnd”时才有效，例如以下示例：

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Dim str As String = String.Empty
    For x As Int32 = 1 To 1000 : str += vbNewLine & x : Next
    FastColoredTextBox1.Text = str
    GoEnd()
End Sub

这与我评论过的第一个问题相同（TextChanged 事件未按预期工作），我需要使其高效且通用，我认为 Control 的“TextChanged”事件将是放置“GoEnd()”的正确事件，但绝对不是。

我不想这样做：

1. Add text
2. Call GoEnd
3. Add more text
4. Call again GoEnd

我不想将“GoEnd”放在更改文本时成功的事件中以简化事情：

1. add text
2. add more text

更新三

所有问题都解决了，只是更改了事件名称：

Public Class Form1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim mytext As String = String.Empty
        For x As Int32 = 1 To 1000 : mytext += vbNewLine & x : Next
        FastColoredTextBox1.Text += mytext
        FastColoredTextBox1.Focus()
    End Sub

Private Sub FastColoredTextBox1_TextChanged(sender As Object, e As FastColoredTextBoxNS.TextChangedEventArgs) _
    Handles FastColoredTextBox1.TextChangedDelayed

    sender.ScrollLeft()
    sender.Navigate(sender.Lines.Count - 1)
    FastColoredTextBox1.SelectionStart = FastColoredTextBox1.Text.Length

End Sub

End Class

Answer 1

显然已经有专门用于此操作的方法：

    public void GoEnd()
    {
        if (lines.Count > 0)
            Selection.Start = new Place(lines[lines.Count - 1].Count,
                                        lines.Count - 1);
        else
            Selection.Start = new Place(0, 0);

        DoCaretVisible();
    }

请注意，您还需要：

Dim tbSender as FastColoredTextBox
tbSender = DirectCast(sender, FastColoredTextBox) 
tbSender.Text = str
tbSender.GoEnd()
' ...

最后我推荐：

Option Explicit

几乎在所有 VB 代码中。

编辑：测试控件后，延迟事件有效

FastColoredTextBox1.TextChangedDelayed += FastColoredTextBox1_TextChanged;

注意：这意味着每个触发事件的默认延迟为 100 毫秒。