70 lines
1.8 KiB
C#
70 lines
1.8 KiB
C#
using System.Linq;
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using System.Windows;
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using Microsoft.Research.DynamicDataDisplay;
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using Microsoft.Research.DynamicDataDisplay.Common;
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using Microsoft.Research.DynamicDataDisplay.Common.Auxiliary;
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using System;
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using System.Collections.Specialized;
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namespace Microsoft.Research.DynamicDataDisplay.ViewportRestrictions
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{
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/// <summary>
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/// Represents a collection of <see cref="ViewportRestriction"/>s.
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/// <remarks>
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/// ViewportRestriction that is being added should not be null.
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/// </remarks>
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/// </summary>
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public sealed class RestrictionCollection : D3Collection<ViewportRestriction>
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{
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private readonly Viewport2D viewport;
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internal RestrictionCollection(Viewport2D viewport)
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{
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if (viewport == null)
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throw new ArgumentNullException("viewport");
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this.viewport = viewport;
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}
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protected override void OnItemAdding(ViewportRestriction item)
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{
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if (item == null)
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throw new ArgumentNullException("item");
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}
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protected override void OnItemAdded(ViewportRestriction item)
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{
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item.Changed += OnItemChanged;
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ISupportAttachToViewport attachable = item as ISupportAttachToViewport;
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if (attachable != null)
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{
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attachable.Attach(viewport);
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}
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}
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private void OnItemChanged(object sender, EventArgs e)
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{
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OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
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}
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protected override void OnItemRemoving(ViewportRestriction item)
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{
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ISupportAttachToViewport attachable = item as ISupportAttachToViewport;
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if (attachable != null)
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{
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attachable.Detach(viewport);
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}
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item.Changed -= OnItemChanged;
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}
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internal DataRect Apply(DataRect oldVisible, DataRect newVisible, Viewport2D viewport)
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{
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DataRect res = newVisible;
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foreach (var restriction in this)
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{
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res = restriction.Apply(oldVisible, res, viewport);
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}
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return res;
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}
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}
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}
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