source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/PopupTipElement.cs @ 13398

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;
using System.Windows.Controls.Primitives;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Shapes;
using System.Windows.Media;
using Microsoft.Research.DynamicDataDisplay.Common.Auxiliary;

namespace Microsoft.Research.DynamicDataDisplay.Charts
{
  public abstract class PopupTipElement : IPlotterElement
  {
    /// <summary>Shows tooltips.</summary>
    private PopupTip popup;

    protected PopupTip GetPopupTipWindow()
    {
      if (popup != null)
        return popup;

      foreach (var item in Plotter.Children)
      {
        if (item is ViewportUIContainer)
        {
          ViewportUIContainer container = (ViewportUIContainer)item;
          if (container.Content is PopupTip)
            return popup = (PopupTip)container.Content;
        }
      }

      popup = new PopupTip();
      popup.Placement = PlacementMode.Relative;
      popup.PlacementTarget = plotter.CentralGrid;
      Plotter.Children.Add(popup);
      return popup;
    }

    private void OnMouseLeave(object sender, MouseEventArgs e)
    {
      GetPopupTipWindow().Hide();
    }

    private void OnMouseMove(object sender, MouseEventArgs e)
    {
      var popup = GetPopupTipWindow();
      if (popup.IsOpen)
        popup.Hide();

      Point screenPoint = e.GetPosition(plotter.CentralGrid);
      Point viewportPoint = screenPoint.ScreenToData(plotter.Transform);

      var tooltip = GetTooltipForPoint(viewportPoint);
      if (tooltip == null) return;

      popup.VerticalOffset = screenPoint.Y + 20;
      popup.HorizontalOffset = screenPoint.X;

      popup.ShowDelayed(TimeSpan.FromSeconds(0));

      Grid grid = new Grid();

      Rectangle rect = new Rectangle
      {
        Stroke = Brushes.Black,
        Fill = SystemColors.InfoBrush
      };

      StackPanel panel = new StackPanel();
      panel.Orientation = Orientation.Vertical;
      panel.Children.Add(tooltip);
      panel.Margin = new Thickness(4, 2, 4, 2);

      var textBlock = new TextBlock();
      textBlock.Text = String.Format("Location: {0:F2}, {1:F2}", viewportPoint.X, viewportPoint.Y);
      textBlock.Foreground = SystemColors.GrayTextBrush;
      panel.Children.Add(textBlock);

      grid.Children.Add(rect);
      grid.Children.Add(panel);
      grid.Measure(SizeHelper.CreateInfiniteSize());
      popup.Child = grid;
    }

    protected virtual UIElement GetTooltipForPoint(Point viewportPosition)
    {
      return null;
    }

    #region IPlotterElement Members

    private Plotter2D plotter;
    public void OnPlotterAttached(Plotter plotter)
    {
      this.plotter = (Plotter2D)plotter;
      plotter.CentralGrid.MouseMove += OnMouseMove;
      plotter.CentralGrid.MouseLeave += OnMouseLeave;
    }

    public void OnPlotterDetaching(Plotter plotter)
    {
      plotter.CentralGrid.MouseMove -= OnMouseMove;
      plotter.CentralGrid.MouseLeave -= OnMouseLeave;
      this.plotter = null;
    }

    public Plotter Plotter
    {
      get { return plotter; }
    }

    #endregion
  }
}