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突出显示文本标签中的多个字符

highlighting label colors .net

xsl Fredrik Hedblad · 技术社区 · 14 年前

我正在寻找一种使用.NET Compact Framework突出显示文本标签中多个字符的方法。E、 g.在包含文本的标签中 Hello World ,我想要 H 以及 r

小时埃洛沃右 ld

& 给目标字符加下划线,但不幸的是,它只会给一个字符加下划线。我不在乎这些字符是用不同的颜色,粗体的还是下划线的,唯一重要的是它们很显眼。

1 回复 | 直到 13 年前

xsl Fredrik Hedblad 14 年前

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代码:

在.NETCompactFramework3.5、WindowsMobile6SDK上测试过,可能也可以在.NETFramework上工作。

/// <summary>
/// A label which offers you the possibility to highlight characters 
/// at defined positions.
/// See <see cref="HighlightPositions"/>, <see cref="HighlightStyle"/> and
/// <see cref="HighlightColor"/>
/// The text in the Text property will be displayed.
/// </summary>
public partial class HighlightLabel : Control
{
    /// <summary>
    /// Initializes a new instance of the class.
    /// </summary>
    public HighlightLabel()
    {
        InitializeComponent();
    }
    /// <summary>
    /// An array of all positions in the text to be highlighted.
    /// </summary>
    public int[] HighlightPositions { get; set; }

    /// <summary>
    /// Gets or sets the highlight style.
    /// </summary>
    public FontStyle HighlightStyle { get; set; }

    /// <summary>
    /// Gets or sets the highlight color.
    /// </summary>
    public Color HighlightColor { get; set; }

    // Paints the string and applies the highlighting style.
    protected override void OnPaint(PaintEventArgs e)
    {
        if (HighlightPositions == null)
            HighlightPositions = new int[] { };

        var usedOffsets = new List<float>();

        for (var i = 0; i < Text.Length; i++)
        {
            var characterToPaint =
                Text[i].ToString(CultureInfo.CurrentCulture);

            var selectedFont = Font;
            var selectedColor = ForeColor;

            if (HighlightPositions.Contains(i))
            {
                selectedColor = HighlightColor;
                selectedFont = new Font(Font.Name, Font.Size, 
                    HighlightStyle);
            }

            var currentOffset = usedOffsets.Sum();

            e.Graphics.DrawString(characterToPaint, selectedFont,
                new SolidBrush(selectedColor),
                new RectangleF(e.ClipRectangle.X + currentOffset,
                    e.ClipRectangle.Y, e.ClipRectangle.Width,
                    e.ClipRectangle.Height));

            var offset = e.Graphics.MeasureString(characterToPaint,
                selectedFont).Width;

            usedOffsets.Add(offset);
        }
    }
}

highlightLabel.HighlightPositions = new[] { 1, 8 };
highlightLabel.HighlightStyle = FontStyle.Bold;
highlightLabel.HighlightColor = Color.Red