1 | using System.Linq;
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2 | using System.Windows;
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3 | using Microsoft.Research.DynamicDataDisplay;
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4 | using Microsoft.Research.DynamicDataDisplay.Common;
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5 | using Microsoft.Research.DynamicDataDisplay.Common.Auxiliary;
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6 | using System;
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7 | using System.Collections.Specialized;
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8 |
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9 | namespace Microsoft.Research.DynamicDataDisplay.ViewportConstraints
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10 | {
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11 | /// <summary>
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12 | /// Represents a collection of <see cref="ViewportConstraint"/>s.
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13 | /// <remarks>
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14 | /// ViewportConstraint that is being added should not be null.
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15 | /// </remarks>
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16 | /// </summary>
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17 | public sealed class ConstraintCollection : D3Collection<ViewportConstraint>
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18 | {
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19 | private readonly Viewport2D viewport;
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20 | internal ConstraintCollection(Viewport2D viewport)
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21 | {
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22 | if (viewport == null)
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23 | throw new ArgumentNullException("viewport");
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24 |
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25 | this.viewport = viewport;
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26 | }
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27 |
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28 | protected override void OnItemAdding(ViewportConstraint item)
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29 | {
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30 | if (item == null)
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31 | throw new ArgumentNullException("item");
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32 | }
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33 |
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34 | protected override void OnItemAdded(ViewportConstraint item)
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35 | {
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36 | item.Changed += OnItemChanged;
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37 | ISupportAttachToViewport attachable = item as ISupportAttachToViewport;
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38 | if (attachable != null)
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39 | {
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40 | attachable.Attach(viewport);
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41 | }
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42 | }
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43 |
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44 | private void OnItemChanged(object sender, EventArgs e)
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45 | {
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46 | OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
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47 | }
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48 |
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49 | protected override void OnItemRemoving(ViewportConstraint item)
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50 | {
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51 | ISupportAttachToViewport attachable = item as ISupportAttachToViewport;
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52 | if (attachable != null)
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53 | {
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54 | attachable.Detach(viewport);
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55 | }
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56 | item.Changed -= OnItemChanged;
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57 | }
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58 |
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59 | internal DataRect Apply(DataRect oldVisible, DataRect newVisible, Viewport2D viewport)
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60 | {
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61 | DataRect res = newVisible;
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62 | foreach (var constraint in this)
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63 | {
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64 | res = constraint.Apply(oldVisible, res, viewport);
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65 | }
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66 | return res;
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67 | }
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68 | }
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69 | }
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