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Forward pointer wheel event from scrollbar to scrollviewer #16398

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merged 4 commits into from
Aug 2, 2024
Merged

Forward pointer wheel event from scrollbar to scrollviewer #16398

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f3c3579
forward pointer wheel event from scrollbar to scrollviewer
emmauss Jul 22, 2024
e0db4ce
Merge branch 'master' into scrollbar_wheel
maxkatz6 Jul 22, 2024
95b9369
Merge branch 'master' into scrollbar_wheel
emmauss Jul 31, 2024
53790d2
raise cloned pointer wheel event in scrollbar
emmauss Jul 31, 2024
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21 changes: 21 additions & 0 deletions src/Avalonia.Controls/Primitives/ScrollBar.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -257,6 +257,27 @@ protected override void OnKeyDown(KeyEventArgs e)
}
}

protected override void OnPointerWheelChanged(PointerWheelEventArgs e)
{
base.OnPointerWheelChanged(e);

// We need to handle pointer wheel event to allow scrolling with the pointer wheel. So we raise the event on the scrollviewer's presenter
if (!e.Handled && _owner?.Presenter is { } presenter && VisualRoot is Visual root)
{
e.Handled = true;
e = new PointerWheelEventArgs(
this,
e.Pointer,
root,
e.GetPosition(root),
e.Timestamp,
new PointerPointProperties((RawInputModifiers)e.KeyModifiers, PointerUpdateKind.Other),
e.KeyModifiers,
e.Delta);
presenter.RaiseEvent(e);
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By re-raising the same RoutedEventArgs, this will change the observable RoutedEventArgs.Source and Route, so parent listeners will have wrong information to act on (e.g. Tunnel mode in a middle of a Bubble).

I think a copy of the event should be raised instead to avoid this.

The original event probably needs to be marked as handled if the copy is handled.

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Update done.

}
}

protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
{
base.OnPropertyChanged(change);
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