WPF中与TextRenderer相对应的是什么？

Question

我之前使用 TextRenderer 来测量字符串的长度，以此来适应控件的尺寸。在WPF中是否有类似的功能？或者我能直接使用 TextRendered.MeasureString 吗？

- James

Answer 1

谢谢Gishu，

通过阅读您提供的链接，我得出了以下两个代码，都可以胜任我的需求：

    /// <summary>
    /// Get the required height and width of the specified text. Uses FortammedText
    /// </summary>
    public static Size MeasureTextSize(string text, FontFamily fontFamily, FontStyle fontStyle, FontWeight fontWeight, FontStretch fontStretch, double fontSize)
    {
        FormattedText ft = new FormattedText(text,
                                             CultureInfo.CurrentCulture,
                                             FlowDirection.LeftToRight,
                                             new Typeface(fontFamily, fontStyle, fontWeight, fontStretch),
                                             fontSize,
                                             Brushes.Black);
        return new Size(ft.Width, ft.Height);
    }

    /// <summary>
    /// Get the required height and width of the specified text. Uses Glyph's
    /// </summary>
    public static Size MeasureText(string text, FontFamily fontFamily, FontStyle fontStyle, FontWeight fontWeight, FontStretch fontStretch, double fontSize)
    {
        Typeface typeface = new Typeface(fontFamily, fontStyle, fontWeight, fontStretch);
        GlyphTypeface glyphTypeface;

        if(!typeface.TryGetGlyphTypeface(out glyphTypeface))
        {
            return MeasureTextSize(text, fontFamily, fontStyle, fontWeight, fontStretch, fontSize);
        }

        double totalWidth = 0;
        double height = 0;

        for (int n = 0; n < text.Length; n++)
        {
            ushort glyphIndex = glyphTypeface.CharacterToGlyphMap[text[n]];

            double width = glyphTypeface.AdvanceWidths[glyphIndex] * fontSize;

            double glyphHeight = glyphTypeface.AdvanceHeights[glyphIndex]*fontSize;

            if(glyphHeight > height)
            {
                height = glyphHeight;
            }

            totalWidth += width;
        }

        return new Size(totalWidth, height);
    }

- James

Answer 2

请看FormattedText类

如果您需要更精细的控制，则需要降到GlyphTypeface类型的AdvanceWidths成员。在此处找到了一个类似的讨论，其中包含一个代码片段，看起来可能有效。

更新：看起来这可能是在WPF中测量文本的重复.. OP请确认。

- Gishu