source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Viewport2D.AttachedProperties.cs @ 13617

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using Microsoft.Research.DynamicDataDisplay.Common.Auxiliary;
using System.Windows.Threading;
using System.Diagnostics;

namespace Microsoft.Research.DynamicDataDisplay
{
  public partial class Viewport2D
  {
    #region IsContentBoundsHost attached property

    public static bool GetIsContentBoundsHost(DependencyObject obj)
    {
      return (bool)obj.GetValue(IsContentBoundsHostProperty);
    }

    public static void SetIsContentBoundsHost(DependencyObject obj, bool value)
    {
      obj.SetValue(IsContentBoundsHostProperty, value);
    }

    public static readonly DependencyProperty IsContentBoundsHostProperty = DependencyProperty.RegisterAttached(
      "IsContentBoundsHost",
      typeof(bool),
      typeof(Viewport2D),
      new FrameworkPropertyMetadata(true, OnIsContentBoundsChanged));

    private static void OnIsContentBoundsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      IPlotterElement plotterElement = d as IPlotterElement;
      if (plotterElement != null && plotterElement.Plotter != null)
      {
        Plotter2D plotter2d = (Plotter2D)plotterElement.Plotter;
        plotter2d.Viewport.UpdateContentBoundsHosts();
      }
    }

    #endregion

    #region ContentBounds attached property

    public static DataRect GetContentBounds(DependencyObject obj)
    {
      return (DataRect)obj.GetValue(ContentBoundsProperty);
    }

    public static void SetContentBounds(DependencyObject obj, DataRect value)
    {
      obj.SetValue(ContentBoundsProperty, value);
    }

    public static readonly DependencyProperty ContentBoundsProperty = DependencyProperty.RegisterAttached(
      "ContentBounds",
      typeof(DataRect),
      typeof(Viewport2D),
      new FrameworkPropertyMetadata(DataRect.Empty, OnContentBoundsChanged, CoerceContentBounds));

    private static object CoerceContentBounds(DependencyObject d, object value)
    {
      DataRect prevBounds = GetContentBounds(d);
      DataRect currBounds = (DataRect)value;

      bool approximateComparanceAllowed = GetUsesApproximateContentBoundsComparison(d);

      bool areClose = approximateComparanceAllowed && currBounds.IsCloseTo(prevBounds, 0.005);
      if (areClose)
        return DependencyProperty.UnsetValue;
      else
        return value;
    }

    private static void OnContentBoundsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      IPlotterElement element = d as IPlotterElement;
      if (element != null)
      {
        FrameworkElement frElement = element as FrameworkElement;
        if (frElement != null)
        {
          frElement.RaiseEvent(new RoutedEventArgs(ContentBoundsChangedEvent));
        }

        Plotter2D plotter2d = element.Plotter as Plotter2D;
        if (plotter2d != null)
        {
          plotter2d.Viewport.UpdateContentBoundsHosts();
        }
      }
    }

    public static readonly RoutedEvent ContentBoundsChangedEvent = EventManager.RegisterRoutedEvent(
      "ContentBoundsChanged",
      RoutingStrategy.Direct,
      typeof(RoutedEventHandler),
      typeof(Viewport2D));

    #endregion

    #region UsesApproximateContentBoundsComparison

    /// <summary>
    /// Gets a value indicating whether approximate content bounds comparison will be used while deciding whether to updating Viewport2D.ContentBounds
    /// attached dependency property or not.
    /// Approximate content bounds comparison can make Viewport's Visible to changed less frequent, but it can lead to
    /// some bugs if content bounds are large but visible area is not compared to them.
    /// </summary>
    /// <value>
    ///   <c>true</c> if approximate content bounds comparison is used while deciding whether to set new value of content bounds, or not; otherwise, <c>false</c>.
    /// </value>
    public static bool GetUsesApproximateContentBoundsComparison(DependencyObject obj)
    {
      return (bool)obj.GetValue(UsesApproximateContentBoundsComparisonProperty);
    }

    /// <summary>
    /// Sets a value indicating whether approximate content bounds comparison will be used while deciding whether to updating Viewport2D.ContentBounds
    /// attached dependency property or not.
    /// Approximate content bounds comparison can make Viewport's Visible to changed less frequent, but it can lead to
    /// some bugs if content bounds are large but visible area is not compared to them.
    /// </summary>
    /// <value>
    ///   <c>true</c> if approximate content bounds comparison is used while deciding whether to set new value of content bounds, or not; otherwise, <c>false</c>.
    /// </value>    
    public static void SetUsesApproximateContentBoundsComparison(DependencyObject obj, bool value)
    {
      obj.SetValue(UsesApproximateContentBoundsComparisonProperty, value);
    }

    public static readonly DependencyProperty UsesApproximateContentBoundsComparisonProperty = DependencyProperty.RegisterAttached(
      "UsesApproximateContentBoundsComparison",
      typeof(bool),
      typeof(Viewport2D),
      new FrameworkPropertyMetadata(true, OnUsesApproximateContentBoundsComparisonChanged));

    private static void OnUsesApproximateContentBoundsComparisonChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      IPlotterElement element = d as IPlotterElement;
      if (element != null)
      {
        Plotter2D plotter2d = element.Plotter as Plotter2D;
        if (plotter2d != null)
        {
          plotter2d.Viewport.UpdateVisible();
        }
      }
    }

    #endregion // end of UsesApproximateContentBoundsComparison

    #region UseDeferredPanning attached property

    public static bool GetUseDeferredPanning(DependencyObject obj)
    {
      return (bool)obj.GetValue(UseDeferredPanningProperty);
    }

    public static void SetUseDeferredPanning(DependencyObject obj, bool value)
    {
      obj.SetValue(UseDeferredPanningProperty, value);
    }

    public static readonly DependencyProperty UseDeferredPanningProperty = DependencyProperty.RegisterAttached(
      "UseDeferredPanning",
      typeof(bool),
      typeof(Viewport2D),
      new FrameworkPropertyMetadata(false));

    #endregion // end of UseDeferredPanning attached property
  }
}