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using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace PhotoshopColorSwatchWriter
{
  internal class PalettePanel : BufferedPanel
  {
    #region Constants

    private const int DefaultX = 6;

    private const int DefaultY = 6;

    private const int Spacing = 6;

    private const int CellSize = 16;

    #endregion

    #region Instance Fields

    private List<Color> _colors;

    #endregion

    #region Overridden Methods

    /// <summary>
    /// Raises the <see cref="E:System.Windows.Forms.Control.Paint"/> event.
    /// </summary>
    /// <param name="e">A <see cref="T:System.Windows.Forms.PaintEventArgs"/> that contains the event data. </param>
    protected override void OnPaint(PaintEventArgs e)
    {
      base.OnPaint(e);

      if (this.Colors != null)
      {
        int x;
        int y;

        x = DefaultX;
        y = DefaultY;

        e.Graphics.Clear(this.BackColor);

        foreach (Color color in this.Colors)
        {
          Rectangle bounds;

          if (x > this.ClientSize.Width - (CellSize + DefaultX))
          {
            x = DefaultX;
            y += DefaultY + CellSize + Spacing;
          }

          bounds = new Rectangle(x, y, CellSize, CellSize);

          using (Brush brush = new SolidBrush(color))
            e.Graphics.FillRectangle(brush, bounds);

          e.Graphics.DrawRectangle(Pens.Black, bounds);

          x += (CellSize + Spacing);
        }
      }
    }

    #endregion

    #region Public Properties

    [Browsable(false)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public List<Color> Colors
    {
      get { return _colors; }
      set
      {
        _colors = value;

        this.Invalidate();
      }
    }

    #endregion
  }
}