是否有可能"变焦"在WPF RichTextBox的文本？ [英] Is it possible to "zoom" the text in a WPF RichTextBox?

问题描述

我注意到的WinForms RichTextBox中有我想正是我想要什么 ZoomFactor 属性 - 不幸的是，这似乎在WPF变种完全丢失。

I noticed the WinForms RichTextBox has a ZoomFactor property that I assume is exactly what I want--unfortunately this seems to be entirely missing on the WPF variant.

有没有什么办法可以实现相同的功能（增加/减少整个文件的可见文本大小没有实际改变底层RTF）？

Is there any way I can achieve the same functionality (increasing/decreasing the visible text size of the whole document without actually changing the underlying RTF)?

更新：虽然关于RichTextBox的设置LayoutTransform似乎在非常简单的设置工作，它不完全等同于设置的，因为有两件事情ZoomFactor：

Update: While setting a LayoutTransform on the RichTextBox does seem to work under very simple settings, it's not exactly the same as setting ZoomFactor because of a couple things:

• 首先，滚动条也被放大。这只是看起来很傻


• 其次，在我的应用程序（出于某种原因，但不是在Kaxaml - I'll探索这个找出原因），文字的的位图缩放的，以便它只是扩大，而不是呈现的文本矢量缩放它所以它是平滑的。这里就是我说的（注意方式，大的自定义滚动条）的例子：

• First, the scroll bar is zoomed also. This just looks silly.
• Second, in my app (for some reason, but not in Kaxaml--I'll explore this to figure out why), the text is bitmap zoomed so that it just enlarges the rendered text as opposed to vector-zooming it so it's smooth. Here's an example of what I'm talking about (note the way-big custom scroll bar):

更新2：好我发现，缩放，位图正在被设定为TextOptions.TextFormattingMode 显示的而不是理想引起的。将其设置为理想的载体重新引入变焦。

Update 2: Okay I discovered that the bitmap zooming was being caused by setting TextOptions.TextFormattingMode to Display instead of Ideal. Setting it to ideal reintroduces vector zooming.

不过还是有那个讨厌的滚动条！我的意思是一种选择是在RichTextBox中禁用滚动，并在包装​​的ScrollViewer，但我不知道这是否会降低性能。我也想知道，如果我这样做，文字换行，仍能正常工作

However there is still that pesky scroll bar! I mean one option is to disable scrolling on the RichTextBox and wrap it in a ScrollViewer, but I wonder if that would deteriorate performance. I also wonder if text wrapping would still work if I did that.

推荐答案

这应该让你开始：

<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <DockPanel LastChildFill="True">  
     <Slider x:Name="Scale" DockPanel.Dock="Bottom" Minimum="1" Maximum="20"/>
     <RichTextBox>
      <RichTextBox.LayoutTransform>
        <ScaleTransform ScaleX="{Binding ElementName=Scale, Path=Value}" ScaleY="{Binding ElementName=Scale, Path=Value}"/>
      </RichTextBox.LayoutTransform>
     </RichTextBox>
  </DockPanel>
</P

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