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Introduction

Features

• Heading text
• Header's gradient colors
• Header Display Icon
• Header Display Icon transparent color

Source Code (Download here)

public partial class OutlookPanelEx : Panel
{
  int _headerHeight = 25;
  string _headerText = "header title";
  Color _headerColor1 = Color.FromArgb(89, 135, 214);
  Color _headerColor2 = Color.FromArgb(3, 56, 147);
  Font _headerFont = new Font("Arial", 
        12F, System.Drawing.FontStyle.Bold);
  Image _icon = null;
  Color _iconTransparentColor = Color.White;

  [Browsable(true), Category("Owf")]
  public string HeaderText
  {
    get { return _headerText; }
    set
    {
      _headerText = value;
      Invalidate();
    }
  }

  [Browsable(true), Category("Owf")]
  public Color HeaderColor1
  {
    get { return _headerColor1; }
    set
    {
      _headerColor1 = value;
      Invalidate();
    }
  }

  [Browsable(true), Category("Owf")]
  public Color HeaderColor2
  {
    get { return _headerColor2; }
    set
    {
      _headerColor2 = value;
      Invalidate();
    }
  }

  [Browsable(true), Category("Owf")]
  public Image Icon
  {
    get { return _icon; }
    set
    {
      _icon = value;
      Invalidate();
    }
  }

  [Browsable(true), Category("Owf")]
  public Color IconTransparentColor
  {
    get { return _iconTransparentColor; }
    set
    {
      _iconTransparentColor = value;
      Invalidate();
    }
  }

  //public override Rectangle DisplayRectangle
  //{
  //    get
  //    {
  //        Rectangle clientSize = base.DisplayRectangle;
  //        clientSize.X = 20;
  //        clientSize.Height -= 20;
  //        return clientSize;
  //    }
  //}

  public OutlookPanelEx()
  {
    this.SetStyle(ControlStyles.DoubleBuffer, true);
    this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
    this.SetStyle(ControlStyles.ResizeRedraw, true);
    this.SetStyle(ControlStyles.UserPaint, true);
    this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
    InitializeComponent();
    this.Padding = new Padding(5, _headerHeight + 4, 5, 4);
  }

  private void OutlookPanelEx_Paint(object sender, PaintEventArgs e)
  {
    if (_headerHeight > 1)
    {
      // Draw border;
      DrawBorder(e.Graphics);

      // Draw heaeder
      DrawHeader(e.Graphics);

      // Draw text
      DrawText(e.Graphics);

      // Draw Icon
      DrawIcon(e.Graphics);
    }
  }

  private void DrawBorder(Graphics graphics)
  {
    using (Pen pen = new Pen(this._headerColor2))
    {
      graphics.DrawRectangle(pen, 0, 0, this.Width - 1, 
        this.Height - 1);
    }
  }

  private void DrawHeader(Graphics graphics)
  {
    Rectangle headerRect = new Rectangle(1, 1, this.Width-2, 
        this._headerHeight);
    using (Brush brush = new LinearGradientBrush(headerRect, 
        _headerColor1, _headerColor2, LinearGradientMode.Vertical))
    {
      graphics.FillRectangle(brush, headerRect);
    }
  }

  private void DrawText(Graphics graphics)
  {
    if (!string.IsNullOrEmpty(this._headerText))
    {
      SizeF size = graphics.MeasureString(this._headerText, 
        this._headerFont);
      using (Brush brush = new SolidBrush(Color.White))
      {
        graphics.DrawString(this._headerText, this._headerFont, 
        brush, 5, (_headerHeight - size.Height) / 2);
      }
    }
  }

  private void DrawIcon(Graphics graphics)
  {
    if (this._icon != null)
    {
      Point point = new Point(this.Width - _icon.Width - 2, 
        (_headerHeight - _icon.Height) / 2);
      Bitmap bitmap = new Bitmap(_icon);
      bitmap.MakeTransparent(_iconTransparentColor);
      graphics.DrawImage(bitmap, point);
    }
  }
}

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