设置WPF RichTextBox的宽度和高度根据等宽字体的大小 [英] Setting WPF RichTextBox width and height according to the size of a monospace font

问题描述

我想，以适应WPF的RichTextBox准确容纳字符的网格，尤其是等宽字体。我目前使用FormattedText以确定我的RichTextBox的宽度和高度，但它为我提供测量太小 - 宽度太小，特别是两个字符

有没有执行此任务的更好的办法？这似乎并不成为一个合适的方式来确定我的控件的大小

  RichTextBox的RTB; 
 RTB =新的RichTextBox（）; 
的FontFamily fontFamily中=新的FontFamily（索拉）; 
双fontSize的= 16; 
字符standardizationCharacter ='X'; 
字符串standardizationLine =; 
为（长循环= 0;环路LT;列;环++）{
 standardizationLine + = standardizationCharacter; 
} 
 standardizationLine + = Environment.NewLine; 
字符串standardizationString =; 
为（长循环= 0;环路LT;行;环++）{
 standardizationString + = standardizationLine; 
} 
字样字体=新的字体（fontFamily中，FontStyles.Normal，FontWeights.Normal，FontStretches.Normal）; 
 FormattedText formattedText =新FormattedText（standardizationString，CultureInfo.CurrentCulture，FlowDirection.LeftToRight，字体，fontSize的，Brushes.Black）; 
 rtb.Width = formattedText.Width; 
 rtb.Height = formattedText.Height; 
  

解决方案

假设你有一个非常基本的 RichTextBox的只标准的FlowDocument 里面，那么你必须考虑到所有的额外布局的RichTextBox 使用。

的

Document.PagePadding 属性默认为 {5,0,5,0} 。所以，你必须添加10的宽度。

此外在的RichTextBox 有一个了borderThickness ，默认值为 {1，1，1，1} 。所以你必须加2，宽度

所以，你想可能看起来像代码：

  VAR pagePadding = rtb.Document.PagePadding; 
 VAR了borderThickness = rtb.BorderThickness; 
 rtb.Width = formattedText.Width 
 + pagePadding.Left + pagePadding.Right 
 + borderThickness.Left + borderThickness.Right; 
  

如果你这样做，你将仍然由1个字符被关闭，但是这是一个有点误导。在的RichTextBox 如果文本只是一点点宽而不是整个字符宽度甚至会换行。如果添加2宽度它的作品了。其中，额外2是来自我无法弄清楚到底。我从来没有试图让宽度是如此精确。我已经运行到 PagePadding 和了borderThickness 问题之前，但我只是找不到多余的2。它可能只是你被卡住恒定的，但我对此表示怀疑。它在什么地方。

一个小技巧上产生 StandardizationLine ，你可以做

 字符串StandardizationLine =新的字符串（'X'，列）; 
  

要清理循环。

I am trying to fit a WPF RichTextBox to exactly accommodate a grid of characters in a particular monospace font. I am currently using FormattedText to determine the width and height of my RichTextBox, but the measurements it is providing me with are too small--specifically two characters in width too small.

Is there a better way to perform this task? This does not seem to be an appropriate way to determine the size of my control.

RichTextBox rtb;
rtb = new RichTextBox();
FontFamily fontFamily = new FontFamily("Consolas");
double fontSize = 16;
char standardizationCharacter = 'X';
String standardizationLine = "";
for(long loop = 0; loop < columns; loop ++) {
    standardizationLine += standardizationCharacter;
}
standardizationLine += Environment.NewLine;
String standardizationString = "";
for(long loop = 0; loop < rows; loop ++) {
    standardizationString += standardizationLine;
}
Typeface typeface = new Typeface(fontFamily, FontStyles.Normal, FontWeights.Normal, FontStretches.Normal);
FormattedText formattedText = new FormattedText(standardizationString, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, typeface, fontSize, Brushes.Black);
rtb.Width = formattedText.Width;
rtb.Height = formattedText.Height;

解决方案

Assuming you have a very basic RichTextBox with just the standard FlowDocument inside it then you have to take into account all of the extra layout RichTextBox uses.

The Document.PagePadding property defaults to {5,0,5,0}. So you will have to add 10 to the width.

Additionally the RichTextBox has a BorderThickness that defaults to {1, 1, 1, 1}. So you will have to add 2 to the width.

So the code you want could look like:

var pagePadding = rtb.Document.PagePadding;
var borderThickness = rtb.BorderThickness;
rtb.Width = formattedText.Width
    + pagePadding.Left + pagePadding.Right 
    + borderThickness.Left + borderThickness.Right;

If you do that you will still be off by 1 character, but that's a bit misleading. The RichTextBox will wrap even if the text is just a tiny bit to wide not just a whole character width. If you add 2 to the width it works out. I can't figure out exactly where that extra 2 is coming from. I've never tried to get the width to be so exact. I have run into the PagePadding and BorderThickness issues before, but I just can't find the extra 2. It might just be a constant you are stuck with, but I doubt it. It's got to be somewhere.

A small tip on producing the StandardizationLine you can do

string StandardizationLine = new string('X', columns);

to clean up the loop.

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