56 lines
1.1 KiB
C#
56 lines
1.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Windows;
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using System.Diagnostics.CodeAnalysis;
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namespace Microsoft.Research.DynamicDataDisplay.DataSources
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{
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/// <summary>
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/// Empty data source - for testing purposes, represents data source with 0 points inside.
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/// </summary>
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public class EmptyDataSource : IPointDataSource
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{
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#region IPointDataSource Members
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public IPointEnumerator GetEnumerator(DependencyObject context)
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{
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return new EmptyPointEnumerator();
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}
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[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
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private void RaiseDataChanged()
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{
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if (DataChanged != null)
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{
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DataChanged(this, EventArgs.Empty);
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}
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}
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public event EventHandler DataChanged;
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#endregion
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private sealed class EmptyPointEnumerator : IPointEnumerator
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{
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public bool MoveNext()
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{
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return false;
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}
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public void GetCurrent(ref Point p)
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{
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// nothing to do
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}
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public void ApplyMappings(DependencyObject target)
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{
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// nothing to do
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}
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public void Dispose() { }
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}
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}
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}
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