突出顯示文本標籤中的多個字符

Question

我正在尋找一種方法來使用.NET Compact Framework突出顯示文本標籤中的多個字符。例如。其中包含文本Hello World一個標籤，我想H和r突出就像這個例子：

^h ELLO禾[R LD

我最初的解決方案是濫用&以強調目標角色，但不幸的是它只會強調一個角色。我不在乎這些角色的顏色是不同的，大膽的還是強調的，唯一重要的是他們脫穎而出。

Answer 1

前瞻：

更新：

添加顏色高亮的支持。

代碼：

測試在.NET Compact Framework的3.5的Windows Mobile 6 SDK，也許應該在.NET框架的工作了。

/// <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); 
     } 
    } 
} 

用法：

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