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Fix memory leak in ListView #1243

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Fix memory leak in ListView #1243

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14 changes: 12 additions & 2 deletions src/Wpf.Ui/Controls/ListView/ListView.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,8 @@ namespace Wpf.Ui.Controls;
/// </example>
public class ListView : System.Windows.Controls.ListView
{
private DependencyPropertyDescriptor? _descriptor;

/// <summary>Identifies the <see cref="ViewState"/> dependency property.</summary>
public static readonly DependencyProperty ViewStateProperty = DependencyProperty.Register(
nameof(ViewState),
Expand Down Expand Up @@ -62,21 +64,29 @@ protected virtual void OnViewStateChanged(DependencyPropertyChangedEventArgs e)
public ListView()
{
Loaded += OnLoaded;
Unloaded += OnUnloaded;
}

private void OnLoaded(object sender, RoutedEventArgs e)
{
Loaded -= OnLoaded; // prevent memory leaks

// Setup initial ViewState and hook into View property changes
var descriptor = DependencyPropertyDescriptor.FromProperty(
_descriptor = DependencyPropertyDescriptor.FromProperty(
System.Windows.Controls.ListView.ViewProperty,
typeof(System.Windows.Controls.ListView)
);
descriptor?.AddValueChanged(this, OnViewPropertyChanged);
_descriptor?.AddValueChanged(this, OnViewPropertyChanged);
UpdateViewState(); // set the initial state
}

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

_descriptor?.RemoveValueChanged(this, OnViewPropertyChanged);
}

private void OnViewPropertyChanged(object? sender, EventArgs e)
{
UpdateViewState();
Expand Down