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1 | using System.Windows;
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2 | using System.Windows.Media;
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3 |
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4 | namespace Microsoft.Research.DynamicDataDisplay.Navigation
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5 | {
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6 | /// <summary>Base class for all navigation providers</summary>
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7 | public abstract class NavigationBase : ViewportElement2D
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8 | {
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9 | protected NavigationBase()
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10 | {
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11 | ManualTranslate = true;
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12 | ManualClip = true;
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13 | Loaded += NavigationBase_Loaded;
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14 | }
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15 |
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16 | private void NavigationBase_Loaded(object sender, RoutedEventArgs e)
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17 | {
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18 | OnLoaded(e);
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19 | }
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20 |
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21 | protected virtual void OnLoaded(RoutedEventArgs e)
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22 | {
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23 | // this call enables contextMenu to be shown after loading and
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24 | // before any changes to Viewport - without this call
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25 | // context menu was not shown.
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26 | InvalidateVisual();
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27 | }
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28 |
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29 | protected override void OnRenderCore(DrawingContext dc, RenderState state)
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30 | {
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31 | dc.DrawRectangle(Brushes.Transparent, null, state.Output);
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32 | }
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33 | }
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34 | }
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