WPF RichTextBox 滚动到 TextPointer

发布于 2024-11-27 13:55:05 字数 174 浏览 1 评论 0原文

WPF RichtTextBox 有一种滚动方法：

RichTextBox.ScrollToVerticalOffset(double)

我想以这样的方式滚动，使某个范围或至少是它的开头进入视图。如何以有意义的方式将 TextPointer 转换为 double ？

原文

The WPF RichtTextBox has a method to scroll:

RichTextBox.ScrollToVerticalOffset(double)

I want to scroll in such a way, that a certain range or at least the start of it comes into view. How can I convert a TextPointer to double in a meaningful way?

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转角预定愛 2024-12-04 13:55:05

查看 FrameworkElement.BringIntoView 方法。我正在使用这样的东西：

public void Foo(FlowDocumentScrollViewer viewer) {
    TextPointer t = viewer.Selection.Start;
    FrameworkContentElement e = t.Parent as FrameworkContentElement;
    if (e != null)
         e.BringIntoView();
}

Have a look at the FrameworkElement.BringIntoView Method. I'm using something like this:

public void Foo(FlowDocumentScrollViewer viewer) {
    TextPointer t = viewer.Selection.Start;
    FrameworkContentElement e = t.Parent as FrameworkContentElement;
    if (e != null)
         e.BringIntoView();
}

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无敌元气妹 2024-12-04 13:55:05

使用 GetCharacterRect 获取 RichTextBox 中 TextPointer 的位置：

Rect r = textPointer.GetCharacterRect(LogicalDirection.Backward);
rtb.ScrollToVerticalOffset(r.Y);

Use GetCharacterRect to get position of TextPointer in RichTextBox:

Rect r = textPointer.GetCharacterRect(LogicalDirection.Backward);
rtb.ScrollToVerticalOffset(r.Y);

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清风疏影 2024-12-04 13:55:05

我有点晚了，但这里有一个更完整的答案。当前滚动偏移需要与字符位置结合起来。下面是一个将 RichTextBox 文本指针滚动到视图中心的示例：

var characterRect = textPointer.GetCharacterRect(LogicalDirection.Forward);
RichTextBox.ScrollToHorizontalOffset(RichTextBox.HorizontalOffset + characterRect.Left - RichTextBox.ActualWidth / 2d);
RichTextBox.ScrollToVerticalOffset(RichTextBox.VerticalOffset + characterRect.Top - RichTextBox.ActualHeight / 2d);

您不需要检查负数，因为滚动会导致这种情况。

I'm somewhat late, but here is a more complete answer. The current scroll offsets need to be combined with the character position. Here is an example that scrolls RichTextBox text pointer to the center of the view:

var characterRect = textPointer.GetCharacterRect(LogicalDirection.Forward);
RichTextBox.ScrollToHorizontalOffset(RichTextBox.HorizontalOffset + characterRect.Left - RichTextBox.ActualWidth / 2d);
RichTextBox.ScrollToVerticalOffset(RichTextBox.VerticalOffset + characterRect.Top - RichTextBox.ActualHeight / 2d);

You don't need to check for negative numbers, as the scrolling accounts for this.

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