More issues with CollectionView IsEnabled, InputTransparent, Opacity via Styles and code behind

[beeradmoore]

Description

Based on my other bug #19768 (which may be related) I tried to make a workaround to change InputTransparent and Opacity to "fake" IsEnabled=false, I immediately ran into more issues.

After making this test I found inconsistent results of how a CollectionView performs based on if I set IsEnabled, InputTransparent and Opacity via xaml styles or via code.

The linked example works like so:
Top left - Binds IsEnabled="{Binding IsCollectionViewEnabled}"
Top right - Binds IsEnabled="{Binding IsCollectionViewEnabled}" but also has the AutoInputTransparent style.
Bottom left - In the backing code (not via binding) it sets IsEnabled to true/false depending on the button pushed.
Bottom right - n the backing code (not via binding) it sets Opacity and InputTransparent to 0.5/true and 1.0/false depending on the depending on the button pushed.

In a perfect world if you hit the top row in every CollectionView you will see it select. If you hit the IsEnabled=False button then every CollectionView should go into a disabled like state. Clicking a different item in the CollectionView should not select it. Clicking the IsEnabled=True button should now re-enable every CollectionView and allow you to select another item in the CollectionView.

What actually happens is on clicking IsEnabled=False button

• top left and bottom left CollectionViews go into a disabled looking state (text colour changes) but clicking another row will select it (reminder: these are the two that use IsEnabled explicitly in the binding or in the code behind.
• top right and bottom right CollectionViews go into a disabled looking state and can not be interacted with any further (reminder: these are the two that use Opacity and InputTransparent to fake being disabled).

When re-enabling the CollectionViews with the IsEnabled=True button

• top left and bottom left text color changes back to an enabled state.
• top right can no longer be interacted with (almost like InputTransparent didn't toggle back)
• bottom right goes back to a fully enabled state.

Summary: Bottom right CollectionView is the only one that works as expected.

EDIT: If the following is added to the MainPageModel.cs

[ObservableProperty]
bool isInputTransparent = false;

[ObservableProperty]
double opacity = 1.0;

changing the binding of the top right CollectionView to use InputTransparent="{Binding IsInputTransparent}" Opacity="{Binding Opacity}" and not use IsEnabled or Style it will behave the same as the CollectionView in the bottom right.

My take-away with that is that using a Style does not make it behave odd, however using IsEnabled + InputTransparent(style) + Opacity(style) is causing some bugs to happen.

EDIT 2:
Adding the following VisualStates to the top right collection view (removing any style, keeping IsEnabled binding)

<VisualStateManager.VisualStateGroups>
    <VisualStateGroup x:Name="CommonStates">
        <VisualState x:Name="Normal">
            <VisualState.Setters>
                <Setter Property="Opacity" Value="1.0" />
                <Setter Property="InputTransparent" Value="false" />
            </VisualState.Setters>
        </VisualState>
        <VisualState x:Name="Disabled">
            <VisualState.Setters>
                <Setter Property="Opacity" Value="0.5" />
                <Setter Property="InputTransparent" Value="true" />
            </VisualState.Setters>
        </VisualState>
    </VisualStateGroup>
</VisualStateManager.VisualStateGroups>

it seems to perform the same as the bottom right CollectionView. To me this seems to indicate using a Style or using a VisualState is behaving differently even though the properties being set are identical. I don't know why these would differ, some race condition maybe?

Steps to Reproduce

1. Create MAUI application
2. Add CollectionView
3. Try disable it with IsEnabled=false or InputTransparent=true+Opacity=0.5

Link to public reproduction project repository

https://github.com/beeradmoore/maui-issue-CollectionViewInputTransparentTest

Version with bug

8.0.3

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android, macOS

Affected platform versions

iOS 17.2.1, macOS 14.2.1, Android 13

Did you find any workaround?

No

Relevant log output

No response

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