source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/ViewportConstraints/InjectionDelegateConstraint.cs @ 13780

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

namespace Microsoft.Research.DynamicDataDisplay.ViewportConstraints
{
  public delegate DataRect ViewportConstraintCallback(DataRect proposedDataRect);

  public class InjectionDelegateConstraint : ViewportConstraint
  {
    public InjectionDelegateConstraint(Viewport2D masterViewport, ViewportConstraintCallback callback)
    {
      if (callback == null)
        throw new ArgumentNullException("callback");
      if (masterViewport == null)
        throw new ArgumentNullException("masterViewport");

      this.callback = callback;
      this.masterViewport = masterViewport;
      masterViewport.PropertyChanged += masterViewport_PropertyChanged;
    }

    void masterViewport_PropertyChanged(object sender, ExtendedPropertyChangedEventArgs e)
    {
      if (e.PropertyName == "Visible")
      {
        RaiseChanged();
      }
    }

    private Viewport2D masterViewport;
    private ViewportConstraintCallback callback;

    public override DataRect Apply(DataRect previousDataRect, DataRect proposedDataRect, Viewport2D viewport)
    {
      return callback(proposedDataRect);
    }
  }
}