Question

我有一列标签，我想制作与最宽文本一样宽的标签。如果我在网页中使用“小”文字大小，是否可以根据可用的最大文本字符串估算标签的宽度？

这适用于带有c＃的ASP.net。

谢谢！

Answer 1

将HTML渲染为虚拟虚拟和隐藏 div，在页面外的某处，然后使用Javascript / jQuery来测量div的大小，该大小随文本一起增长。不要忘记应用css white-space: nowrap;，以便它永远增长。

Answer 2

从这开始： http://www.davidthielen.info/programming/2005/10/getting_accurat.html

我能够调整它以获得以下对我有用的代码：

private static float MAX_RECT = 100000;
    private static float BITMAP_DPI = 2400;
    private static float ADJUST_TO_POINTS = 72.0f / BITMAP_DPI;

    public static float GetTextWidth(String fontname, float fontsize, FontStyle style, String text)
    {
        System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(1, 1);
        bmp.SetResolution(BITMAP_DPI, BITMAP_DPI);
        System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(bmp);
        graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;

        System.Drawing.StringFormat fmt = System.Drawing.StringFormat.GenericTypographic;
        fmt.Trimming=System.Drawing.StringTrimming.None;
        fmt.FormatFlags=System.Drawing.StringFormatFlags.MeasureTrailingSpaces | System.Drawing.StringFormatFlags.NoWrap;

        System.Drawing.Font font = new System.Drawing.Font(fontname, fontsize, style, System.Drawing.GraphicsUnit.Point);

        System.Drawing.RectangleF rect = new System.Drawing.RectangleF(0, 0, MAX_RECT, MAX_RECT);
        fmt.SetMeasurableCharacterRanges(new System.Drawing.CharacterRange[] { new System.Drawing.CharacterRange(0, text.Length) });

        System.Drawing.Region[] rgns = graphics.MeasureCharacterRanges(text, font, rect, fmt);
        rect = rgns[0].GetBounds(graphics);
        return rect.Width * ADJUST_TO_POINTS;
    }

    private static float GetLabelWidth(RS2005.ReportParameter[] parameters, String fontname, double fontSizeUnitVal, FontStyle style, String text)
    {
        float emSize = Convert.ToSingle(fontSizeUnitVal + 1);
        emSize = (emSize == 0 ? 12 : emSize);

        int pCnt = parameters.Count();
        string txt;
        float size = 0;
            for (int i = 0; i < pCnt; i++)
            {
                txt = parameters[i].Prompt == null ? parameters[i].Prompt : parameters[i].Name;
                var width=GetTextWidth(fontname, emSize, style, txt);

                if (width > size)
                    size = width;                                        
            }

            return size;            
    }

我称之为：

size = GetLabelWidth(parameters, pPromptLbl.Font.Name, pPromptLbl.Font.Size.Unit.Value, FontStyle.Bold, pPromptLbl.Text);

                pPromptLbl.Width = Unit.Parse(Math.Round(size+30, 0).ToString());

有没有办法根据字符数动态估计标签宽度？

2 个答案: