RichTextBox – Visual Studio [英] RichTextBox в Visual Studio

问题描述

您能告诉我们如何确定RichTextBox中当前可见的行数吗?"

"Can you tell how to determine numbers of lines which currently are visible in RichTextBox?"

推荐答案

不好，但是...
尝试以下操作:

Not nice, but...
Try this:

int top = myRichTextBox.GetCharIndexFromPosition(new Point(1, 1));
int bottom = myRichTextBox.GetCharIndexFromPosition(new Point(1, myRichTextBox.Height - 1));

int topLine = myRichTextBox.GetLineFromCharIndex(top);
int bottomLine = myRichTextBox.GetLineFromCharIndex(bottom);

int linesDisplayed = bottomLine - topLine;
Console.WriteLine("{0}:{1} = {2}", topLine, bottomLine, linesDisplayed);

以及该代码如何:

and how about this one:

int charCount;
int lineCount;
this.CreateGraphics().MeasureString(
    richTextBox1.Text, 
    richTextBox1.Font,
    new SizeF(richTextBox1.Width, richTextBox1.Height),
    new StringFormat(StringFormatFlags.FitBlackBox), 
    out charCount, 
    out lineCount);

lineCount-1值似乎是正确的可见行数

the lineCount-1 value seems to be the correct visible lines count

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