#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Collections;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using PdfSharp.Drawing;

namespace PdfSharp.Forms
{
  /// <summary>
  /// A combo box control for selection XColor values.
  /// </summary>
  public class ColorComboBox : ComboBox
  {
    /// <summary>
    /// Initializes a new instance of the <see cref="ColorComboBox"/> class.
    /// </summary>
    public ColorComboBox()
    {
      DropDownStyle = ComboBoxStyle.DropDownList;
      DrawMode = DrawMode.OwnerDrawFixed;
      Fill();
    }

    XColorResourceManager crm = new XColorResourceManager();

    /// <summary>
    /// Gets or sets the custom color.
    /// </summary>
    public XColor Color
    {
      get { return this.color; }
      set
      {
        this.color = value;
        if (value.IsKnownColor)
        {
          XKnownColor color = XColorResourceManager.GetKnownColor(value.Argb);
          for (int idx = 1; idx < Items.Count; idx++)
          {
            if (((ColorItem)Items[idx]).Color.Argb == value.Argb)
            {
              SelectedIndex = idx;
              break;
            }
          }
        }
        else
          SelectedIndex = 0;
        Invalidate();
      }
    }
    XColor color = XColor.Empty;

    void Fill()
    {
      Items.Add(new ColorItem(XColor.Empty, "custom"));
      XKnownColor[] knownColors = XColorResourceManager.GetKnownColors(false);
      int count = knownColors.Length;
      for (int idx = 0; idx < knownColors.Length; idx++)
      {
        XKnownColor color = knownColors[idx];
        Items.Add(new ColorItem(XColor.FromKnownColor(color), crm.ToColorName(color)));
      }
    }

    /// <summary>
    /// Keep control a drop down combo box.
    /// </summary>
    protected override void OnDropDownStyleChanged(EventArgs e)
    {
      DropDownStyle = ComboBoxStyle.DropDownList;
      base.OnDropDownStyleChanged(e);
    }

    /// <summary>
    /// Sets the color with the selected item.
    /// </summary>
    protected override void OnSelectedIndexChanged(EventArgs e)
    {
      int index = SelectedIndex;
      if (index > 0)
      {
        ColorItem item = (ColorItem)Items[index];
        this.color = item.Color;
      }
      base.OnSelectedIndexChanged(e);
    }

    /// <summary>
    /// Draw a color entry.
    /// </summary>
    protected override void OnDrawItem(DrawItemEventArgs e)
    {
      int idx = e.Index;

      // Nothing selected?
      if (idx < 0)
        return;

      object obj = Items[idx];
      if (obj is ColorItem)
      {
        ColorItem item = (ColorItem)obj;

        // Is custom color?
        if (idx == 0)
        {
          string name;
          if (this.color.IsEmpty)
            name = "custom";
          else
            name = this.crm.ToColorName(this.color);

          item = new ColorItem(this.color, name);
        }

        XColor clr = item.Color;
        Graphics gfx = e.Graphics;
        Rectangle rect = e.Bounds;
        Brush textbrush = SystemBrushes.ControlText;
        if ((e.State & DrawItemState.Selected) == 0)
        {
          gfx.FillRectangle(SystemBrushes.Window, rect);
          textbrush = SystemBrushes.ControlText;
        }
        else
        {
          gfx.FillRectangle(SystemBrushes.Highlight, rect);
          textbrush = SystemBrushes.HighlightText;
        }

        // Draw color box
        if (!clr.IsEmpty)
        {
          Rectangle box = new Rectangle(rect.X + 3, rect.Y + 1, rect.Height * 2, rect.Height - 3);
          gfx.FillRectangle(new SolidBrush(clr.ToGdiColor()), box);
          gfx.DrawRectangle(Pens.Black, box);
        }

        StringFormat format = new StringFormat(StringFormat.GenericDefault);
        format.Alignment = StringAlignment.Near;
        format.LineAlignment = StringAlignment.Center;
        rect.X += rect.Height * 2 + 3 + 3;
        gfx.DrawString(item.Name, Font, textbrush, rect, format);
      }
    }

    /// <summary>
    /// Represents a combo box item.
    /// </summary>
    struct ColorItem
    {
      public ColorItem(XColor color, string name)
      {
        Color = color;
        Name = name;
      }

      public override string ToString()
      {
        return Name;
      }

      public XColor Color;
      public string Name;
    }
  }
}