[英]How To Set Caret Position At The End Of Current Line In A RichTextBox
I'm trying to place the caret of a RichTextBox
at the end of the current line it's in. The .CaretPosition
attribute is a big change from just using the simple .CaretIndex
attribute of a regular TextBox
. 我正在尝试将RichTextBox
的插入符号放置在当前行的.CaretPosition
属性与仅使用常规TextBox
的简单.CaretIndex
属性相比有很大的变化。
To tackle this issue, I've made my own User-Control which is just a RichTextBox
that has most of the properties/methods a TextBox
has, such as .LineCount
, .Text
, .CaretIndex
, etc. I made a CaretIndex { get; set; }
为了解决此问题,我制作了自己的用户控件,它只是一个RichTextBox
,它具有TextBox
大多数属性/方法,例如.LineCount
, .Text
, .CaretIndex
等。我制作了CaretIndex { get; set; }
CaretIndex { get; set; }
CaretIndex { get; set; }
property within my User-Control that looks like this: CaretIndex { get; set; }
用户控件中的属性如下所示:
public int CaretIndex
{
get
{
TextPointer start = display.Document.ContentStart;
TextPointer curPosition = display.CaretPosition;
TextRange range = new TextRange(start, curPosition);
return range.Text.Length;
}
set
{
display.CaretPosition = display.Document.ContentStart;
for (int i = 0; i < value; i++)
{
TextPointer move = display.CaretPosition.GetNextInsertionPosition(LogicalDirection.Forward);
if (move != null)
display.CaretPosition = move;
}
}
}
The get
method seems to work fine, but set
doesn't do what I envision it to accomplish. get
方法似乎可以正常工作,但是set
并没有实现我预期的目标。 My goal was to have the caret move logically forward a "value" amount of times - value being how many characters I want to move past - but the result is just abstract caret placement behavior. 我的目标是使插入符号在逻辑上向前移动“值”的次数-值是我要移动的字符数-但是结果只是抽象的插入符号放置行为。 The caret could either get placed a couple lines down, right below the original line, or all the way to the bottom of the RichTextBox
. 插入符号可以放到原行下方几行,或者一直到RichTextBox
的底部。
All I want is an easy way to move the caret left or right without undefined behavior. 我想要的是一种简单的方法,可以在没有不确定行为的情况下左右移动插入符号。 Am I approaching my CaretIndex
property the wrong way? 我CaretIndex
以错误的方式访问我的CaretIndex
属性? Do I have a false perception of the CaretPosition
property of a RichTextBox
? 我对RichTextBox
的CaretPosition
属性有CaretPosition
吗? Any suggestions on what to do? 有什么建议吗?
I made a small wpf app to test your code - 我制作了一个小型的wpf应用来测试您的代码-
xaml - XAML-
<Grid.RowDefinitions>
<RowDefinition Height="300"/>
<RowDefinition Height="100"/>
<RowDefinition Height="100"/>
</Grid.RowDefinitions>
<RichTextBox Grid.Row="0" Name="Rtb" />
<Button Grid.Row="1" Content="Get" Click="Button_Get" />
<Grid Grid.Row="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button Grid.Column="0" Content="Set" Click="Button_Set" />
<TextBox Grid.Column="1" Name="DesiredPositionBox" />
</Grid>
c# - C# -
public MainWindow()
{
InitializeComponent();
Rtb.AppendText("lineoftextlineoftextlineoftextlineoftext");
Rtb.AppendText(Environment.NewLine);
Rtb.AppendText("lineoftextlineoftextlineoftextlineoftext");
}
private void Button_Get(object sender, RoutedEventArgs e)
{
TextPointer start = Rtb.Document.ContentStart;
TextPointer curPosition = Rtb.CaretPosition;
TextRange range = new TextRange(start, curPosition);
Debug.WriteLine("Caret position : " + range.Text.Length);
Rtb.Focus();
}
private void Button_Set(object sender, RoutedEventArgs e)
{
int value = int.Parse(DesiredPositionBox.Text);
Rtb.CaretPosition = Rtb.Document.ContentStart;
for (int i = 0; i < value; i++)
{
TextPointer move = Rtb.CaretPosition.GetNextInsertionPosition(LogicalDirection.Forward);
if (move != null)
Rtb.CaretPosition = move;
}
Rtb.Focus();
}
The line Rtb.CaretPosition = Rtb.Document.ContentStart;
行Rtb.CaretPosition = Rtb.Document.ContentStart;
moves the caret to the start every time, so if you pass in '5' the caret will be moved to the 5th character from the start of the RichTextBox. 每次都将插入符号移到起始位置,因此,如果您输入'5',则插入符号将从RichTextBox的起始位置移至第5个字符。
Remove Rtb.CaretPosition = Rtb.Document.ContentStart;
删除Rtb.CaretPosition = Rtb.Document.ContentStart;
and the caret will move x
positions from where it was. 插入符号将从其原处移动x
位置。
edit: To also answer how to place the caret at the end of the line, you can use Rtb.CaretPosition.GetTextRunLength(LogicalDirection.Forward)
to get the number of characters, counting from the caret, before the first non text symbol ( which line break happens to be ). 编辑:还要回答如何将插入号放置在行的末尾,可以使用Rtb.CaretPosition.GetTextRunLength(LogicalDirection.Forward)
获取从插入号开始计算的第一个非文本符号之前的字符数(换行符恰好是)。
So - 所以-
int value = Rtb.CaretPosition.GetTextRunLength(LogicalDirection.Forward);
TextPointer move = Rtb.CaretPosition.GetPositionAtOffset(value);
Rtb.CaretPosition = move;
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