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Don't leak event handlers #2420

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Don't leak event handlers #2420

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23 changes: 23 additions & 0 deletions src/Calculator/Views/GraphingCalculator/GraphingCalculator.xaml.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,8 @@ public GraphingCalculator()
m_uiSettings = new UISettings();
m_uiSettings.ColorValuesChanged += OnColorValuesChanged;

this.Unloaded += OnUnloaded;

ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;

if (localSettings != null && localSettings.Values.ContainsKey(sc_IsGraphThemeMatchApp))
Expand Down Expand Up @@ -887,5 +889,26 @@ private void OnGraphingCalculatorLoaded(object sender, RoutedEventArgs e)
// The control needs to be loaded, else the control will override GridLinesColor and ignore the value passed
UpdateGraphTheme();
}

private void OnUnloaded(object sender, RoutedEventArgs e)
{
this.Unloaded -= OnUnloaded;

var dataTransferManager = DataTransferManager.GetForCurrentView();
dataTransferManager.DataRequested -= OnDataRequested;

GraphingControl.TracingChangedEvent -= OnShowTracePopupChanged;
GraphingControl.TracingValueChangedEvent -= OnTracePointChanged;
GraphingControl.PointerValueChangedEvent -= OnPointerPointChanged;
GraphingControl.Loaded -= OnGraphingCalculatorLoaded;

m_accessibilitySettings.HighContrastChanged -= OnHighContrastChanged;
m_uiSettings.ColorValuesChanged -= OnColorValuesChanged;

if (Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.UI.Xaml.Media.ThemeShadow"))
{
SharedShadow?.Receivers?.Remove(GraphingControl);
}
}
}
}