[Bug] Strange Picker behaviour when used in NavigationPage

[mterhorst]

Description

I encountered two problems with the Picker control, when it is used in a NavigationPage.

Issue #⁠1

A Picker item is selectable, even when IsEnabled is set to False.

1.mp4

Issue #⁠2

The Picker item selector opens automatically, after navigated to a new page.

2.mp4

Steps to Reproduce

MainPage.xaml:

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="TestApp.MainPage"
             BackgroundColor="{DynamicResource SecondaryColor}" Title="This is a navigation page">

    <ScrollView >
        <Grid RowSpacing="25" RowDefinitions="Auto,Auto,Auto">
            <Picker x:Name="picker" Title="Select a monkey">
                <Picker.Items>
                    <x:String>Baboon</x:String>
                    <x:String>Capuchin Monkey</x:String>
                    <x:String>Blue Monkey</x:String>
                    <x:String>Squirrel Monkey</x:String>
                    <x:String>Golden Lion Tamarin</x:String>
                    <x:String>Howler Monkey</x:String>
                    <x:String>Japanese Macaque</x:String>
                </Picker.Items>
            </Picker>
            <Button Text="Disable picker" Clicked="OnBtnDisablePicker" Grid.Row="1"/>
            <Button Text="Navigate new page" Clicked="OnBtnPush" Grid.Row="2"/>
        </Grid>
    </ScrollView>
</ContentPage>

MainPage.xaml.cs:

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
    }

    private void OnBtnDisablePicker(object sender, EventArgs e)
    {
        picker.IsEnabled = !picker.IsEnabled;
    }

    private async void OnBtnPush(object sender, EventArgs e)
    {
        await Navigation.PushAsync(new MainPage());
    }
}

App.xaml.cs:

public partial class App : Application
{
    public App()
    {
        InitializeComponent();
        MainPage = new NavigationPage(new MainPage());
    }
}

Expected Behavior

I expected to not be able to change the selected Picker item, when it's enabled state is set to False.
The Picker item selector should not display on it's own, without actually clicking on it.

Basic Information

• Version with issue: preview 7 - preview 12
• Last known good version: unknown
• IDE: Visual Studio 2022 17.1 Preview 3.0
• Platform Target Frameworks:
  • Android

[mterhorst]

Any progress on this?

[v-xiaofchen]

Verified repro with Android 11 and the above project.

attached the repro sample
MauiApp4.zip

[samhouts]

Outstanding bug report. I love the videos and the sample code. Thank you!

Good news. I can no longer reproduce this on main.