WPF RichTextBox：如何更改选定的文本字体？

Question

如何更改 WPF RichTextBox 中当前选定文本区域的字体？

Answer 1

我已经实现了一个可以更改字体大小、系列、颜色等的工具栏。我发现 wpf richtextbox 的细节可能很棘手。设置选择字体有一定意义，但是，还需要处理文本框的默认字体属性和当前插入符号属性。这是我写的内容，让它适用于大多数情况下的字体大小。 fontfamily 和 fontcolor 的过程应该相同。希望有帮助。

    public static void SetFontSize(RichTextBox target, double value)
    {
        // Make sure we have a richtextbox.
        if (target == null)
            return;

        // Make sure we have a selection. Should have one even if there is no text selected.
        if (target.Selection != null)
        {
            // Check whether there is text selected or just sitting at cursor
            if (target.Selection.IsEmpty)
            {
                // Check to see if we are at the start of the textbox and nothing has been added yet
                if (target.Selection.Start.Paragraph == null)
                {
                    // Add a new paragraph object to the richtextbox with the fontsize
                    Paragraph p = new Paragraph();
                    p.FontSize = value;
                    target.Document.Blocks.Add(p);
                }
                else
                {
                    // Get current position of cursor
                    TextPointer curCaret = target.CaretPosition;
                    // Get the current block object that the cursor is in
                    Block curBlock = target.Document.Blocks.Where
                        (x => x.ContentStart.CompareTo(curCaret) == -1 && x.ContentEnd.CompareTo(curCaret) == 1).FirstOrDefault();
                    if (curBlock != null)
                    {
                        Paragraph curParagraph = curBlock as Paragraph;
                        // Create a new run object with the fontsize, and add it to the current block
                        Run newRun = new Run();
                        newRun.FontSize = value;
                        curParagraph.Inlines.Add(newRun);
                        // Reset the cursor into the new block. 
                        // If we don't do this, the font size will default again when you start typing.
                        target.CaretPosition = newRun.ElementStart;
                    }
                }
            }
            else // There is selected text, so change the fontsize of the selection
            {
                TextRange selectionTextRange = new TextRange(target.Selection.Start, target.Selection.End);
                selectionTextRange.ApplyPropertyValue(TextElement.FontSizeProperty, value);
            }
        }
        // Reset the focus onto the richtextbox after selecting the font in a toolbar etc
        target.Focus();
    }

Answer 2

怎么样：

 TextSelection text = richTextBox.Selection; 
 if (!text.IsEmpty) 
 { 
     text.ApplyPropertyValue(RichTextBox.FontSizeProperty, value); 
 }

Answer 3

解决了...

if (this.TextEditor.Selection.IsEmpty)
    this.TextEditor.CurrentFontFamily = SelectedFont;
else
    this.TextEditor.Selection.ApplyPropertyValue(TextElement.FontFamilyProperty, SelectedFont);

Answer 4

要获取当前选择，请使用：

Dim rng As TextRange = New TextRange(YourRtfBox.Selection.Start, YourRtfBox.Selection.End)

然后设置字体样式：

rng.ApplyPropertyValue(Inline.FontSizeProperty, YourFontSizeValue)
rng.ApplyPropertyValue(Inline.FontFamilyProperty, YourFontFamilyValue)

Answer 5

要更改 RichTextBox 中所选内容的字体系列，您应该使用以下命令：

text.ApplyPropertyValue(Run.FontFamilyProperty, value);

RichTextBox 中的所选文本是一个 Run 对象，因此必须使用 Run 依赖属性。
这似乎至少在 Silverlight 中有效，因此在 WPF 中也应该是同样的事情。