source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Common/Palettes/DecoratorPaletteBase.cs @ 12503

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Media;

namespace Microsoft.Research.DynamicDataDisplay.Common.Palettes
{
  /// <summary>
  /// Represents a base class for decorating palette, which wraps another palette and intercepts calls to it.
  /// </summary>
  public abstract class DecoratorPaletteBase : PaletteBase
  {
    /// <summary>
    /// Initializes a new instance of the <see cref="DecoratorPaletteBase"/> class.
    /// </summary>
    protected DecoratorPaletteBase() { }

    /// <summary>
    /// Initializes a new instance of the <see cref="DecoratorPaletteBase"/> class.
    /// </summary>
    /// <param name="palette">The palette.</param>
    public DecoratorPaletteBase(IPalette palette)
    {
      Palette = palette;
    }

    private IPalette palette = null;
    /// <summary>
    /// Gets or sets the palette being decorated.
    /// </summary>
    /// <value>The palette.</value>
    [NotNull]
    public IPalette Palette
    {
      get { return palette; }
      set
      {
        if (value == null)
          throw new ArgumentNullException("value");

        if (palette != null)
          palette.Changed -= OnChildPaletteChanged;

        palette = value;
        palette.Changed += OnChildPaletteChanged;

        RaiseChanged();
      }
    }

    void OnChildPaletteChanged(object sender, EventArgs e)
    {
      RaiseChanged();
    }

    /// <summary>
    /// Gets the color by interpolation coefficient.
    /// </summary>
    /// <param name="t">Interpolation coefficient, should belong to [0..1].</param>
    /// <returns>Color.</returns>
    public override Color GetColor(double t)
    {
      return palette.GetColor(t);
    }
  }
}