source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/ViewportConstraints/MinimalSizeConstraint.cs @ 13847

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

namespace Microsoft.Research.DynamicDataDisplay.ViewportConstraints
{
  /// <summary>
  /// Represents a ViewportConstraint, which the minimal size of <see cref="Viewport"/>'s Visible.
  /// </summary>
  public class MinimalSizeConstraint : ViewportConstraint
  {
    private double minSize = 1E-11;

    /// <summary>
    /// Gets or sets the minimal size of Viewport's Visible.
    /// </summary>
    /// <value>The minimal size of Viewport's Visible.</value>
    public double MinSize
    {
      get { return minSize; }
      set
      {
        if (minSize != value)
        {
          minSize = value;
          RaiseChanged();
        }
      }
    }

    /// <summary>
    /// Applies the restriction.
    /// </summary>
    /// <param name="previousDataRect">Previous data rectangle.</param>
    /// <param name="proposedDataRect">Proposed data rectangle.</param>
    /// <param name="viewport">The viewport, to which current restriction is being applied.</param>
    /// <returns>New changed visible rectangle.</returns>
    public override DataRect Apply(DataRect previousDataRect, DataRect proposedDataRect, Viewport2D viewport)
    {
      if (proposedDataRect.Width < minSize || proposedDataRect.Height < minSize)
        return previousDataRect;

      return proposedDataRect;
    }
  }
}