[英]Get a WPF RichTextBox to draw a horizontal line over text
Say I have a given TextRange range
that happens to have this text in it -----------------
(On its own line.) 假设我有一个给定的TextRange
range
,恰好在其中包含此文本-----------------
(一行)。
I want to draw a real line whenever I see that text (instead of just 15 dashes). 每当我看到该文本时,我都想画一条实线(而不是15个破折号)。
But, I need to leave the dashes there for when I save it (and when other, plain text viewers load it). 但是,当我保存它时(以及其他纯文本查看器加载它时),我需要在其中留下短划线。
I found how I can draw a line in the RichTextBox: 我找到了如何在RichTextBox中画一条线:
var line = new Line {X1 = 10, X2 = 200, Y1 = 5, Y2 = 5,
var paragraph = (Paragraph) MyRichTextBox.Document.Blocks.FirstBlock;
paragraph.Inlines.Add(line);
But this just draw after the last Inline in the paragraph. 但这只是在该段落的最后一个Inline之后绘制的。
So, my question is: 所以,我的问题是:
How can I draw so that my UIElement does not have text wrapping on (so that I can cover the dashes)? 如何绘画以便UIElement上没有换行符 (以便覆盖虚线)?
Is this possible with the WPF RichTextBox? WPF RichTextBox是否可能?
Could you use "TextDecorations.Strikethrough" for this. 您可以为此使用“ TextDecorations.Strikethrough”吗?
TextRange range = new TextRange(RichTextBox.Selection.Start, RichTextBox.Selection.End);
TextDecorationCollection tdc = (TextDecorationCollection)RichTextBox.Selection.GetPropertyValue(Inline.TextDecorationsProperty);
if (!tdc.Equals(TextDecorations.Strikethrough))
{
tdc = TextDecorations.Strikethrough;
}
range.ApplyPropertyValue(Inline.TextDecorationsProperty, tdc);
I think you have to remove the Inline
from within the paragraph and replace it with a Line
element. 我认为您必须从段落中删除
Inline
并将其替换为Line
元素。 In this case, you will have to replace Line
elements with "-----" on save. 在这种情况下,保存时必须用“ -----”替换
Line
元素。
private void FindHRules()
{
foreach (Paragraph block in rtf.Document.Blocks.OfType<Paragraph>())
{
var inlines = block.Inlines.ToList();
for(int i = 0; i<inlines.Count; i++)
{
var inline = inlines[i];
TextRange r = new TextRange(inline.ContentStart, inline.ContentEnd);
if (r.Text.StartsWith("--"))
{
Line l = new Line { Stretch = Stretch.Fill, Stroke = Brushes.DarkBlue, X2 = 1 };
block.Inlines.InsertAfter(inline, new InlineUIContainer(l));
block.Inlines.Remove(inline);
}
}
}
}
I tested this with a RTF doc that had the "-----" lines in stand-alone paragraphs (<enter>) and line breaks (<shift-enter>) within other paragraphs. 我用一个RTF文档对此进行了测试,该文档的独立段落(<enter>)中带有“ -----”行,而其他段落中具有换行符(<shift-enter>)。
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