.Net Maui - Grid in a Horizontal of Both ScrollView not formatting correctly

Question

I would like to add a scrollable (vertically and horizontally) Grid in a row of an outer Grid. I want to set the Grid column widths based on the GridUnitType.Star. I can achieve this when the SrollView orientation is set to Vertical but not when set to Horizontal or Both. The following XAML demonstrates this:

    <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MauiGrids.MainPage">

    <Grid Margin="20" RowDefinitions="Auto,Auto,Auto">
        <Grid Grid.Row="0" ColumnDefinitions="*,2*,3*">
            <Label Text="Column 1 Outer" Grid.Row="0" Grid.Column="0"/>
            <Label Text="Column 2 Outer" Grid.Row="0" Grid.Column="1"/>
            <Label Text="Column 3 Outer" Grid.Row="0" Grid.Column="2"/>
        </Grid>
        <ScrollView Grid.Row="1" Orientation="Horizontal">
            <Grid ColumnDefinitions="*,2*,3*">
                <Label Text="Column 1 Horizontal" Grid.Row="0" Grid.Column="0"/>
                <Label Text="Column 2 Horizontal" Grid.Row="0" Grid.Column="1"/>
                <Label Text="Column 3 Horizontal" Grid.Row="0" Grid.Column="2"/>
            </Grid>
        </ScrollView>
        <ScrollView Grid.Row="2" Orientation="Vertical">
            <Grid ColumnDefinitions="*,2*,3*">
                <Label Text="Column 1 Vertical" Grid.Row="0" Grid.Column="0"/>
                <Label Text="Column 2 Vertical" Grid.Row="0" Grid.Column="1"/>
                <Label Text="Column 3 Vertical" Grid.Row="0" Grid.Column="2"/>
            </Grid>
        </ScrollView>
    </Grid>
</ContentPage>

The column widths of the outer and vertical grid are correctly set based on the Star value but these values are ignored in the case of the horizontal grid.

Code output.

I was able to do this in Xamarin Forms but does not seem possible in Maui. Am I missing something.

Do you run it on Android or Windows platform? I made a small change based on your code and it works well on Android. — Alexandar May
– Alexandar May, Commented Aug 10, 2022 at 2:52

GDT48 · Accepted Answer · 2022-08-10 12:48:37Z

Think I am a good part the way there. It appears unlike the vertical ScrollView the horizontal ScrollView needs to have a width or a child with a specific width. I have named the outerGrid, the horizontalGrid and the verticalGrid in the XAML.

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MauiGrids.MainPage">

    <Grid Margin="20" RowDefinitions="Auto,Auto,Auto">
        <Grid x:Name="outerGrid" Grid.Row="0" ColumnDefinitions="*,2*,3*">
            <Label Text="Column 1 Outer" Grid.Row="0" Grid.Column="0"/>
            <Label Text="Column 2 Outer" Grid.Row="0" Grid.Column="1"/>
            <Label Text="Column 3 Outer" Grid.Row="0" Grid.Column="2"/>
        </Grid>
        <ScrollView Grid.Row="1" Orientation="Both" HorizontalScrollBarVisibility="Default"  VerticalScrollBarVisibility="Default">
            <Grid x:Name="horizontalGrid" ColumnDefinitions="*,2*,3*">
                <Label Text="Column 1 Horizontal" Grid.Row="0" Grid.Column="0"/>
                <Label Text="Column 2 Horizontal" Grid.Row="0" Grid.Column="1"/>
                <Label Text="Column 3 Horizontal" Grid.Row="0" Grid.Column="2"/>
            </Grid>
        </ScrollView>
        <ScrollView Grid.Row="2" Orientation="Vertical" VerticalScrollBarVisibility="Default">
            <Grid x:Name="verticalGrid" ColumnDefinitions="*,2*,3*">
                <Label Text="Column 1 Vertical" Grid.Row="0" Grid.Column="0"/>
                <Label Text="Column 2 Vertical" Grid.Row="0" Grid.Column="1"/>
                <Label Text="Column 3 Vertical" Grid.Row="0" Grid.Column="2"/>
            </Grid>
        </ScrollView>
    </Grid>

and then set the grid widths in code behind based on the defaulted outerGrid width as follows:

 public MainPage()
    {
        InitializeComponent();
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();
        outerGrid.Loaded += OuterGrid_Loaded;
        this.SizeChanged += MainPage_SizeChanged;
    }

    private void MainPage_SizeChanged(object sender, EventArgs e)
    {
        horizontalGrid.WidthRequest = outerGrid.Width;
        verticalGrid.WidthRequest = outerGrid.Width;
    }

    private void OuterGrid_Loaded(object sender, EventArgs e)
    {
        horizontalGrid.WidthRequest = outerGrid.Width;
        verticalGrid.WidthRequest = outerGrid.Width;
    }

This works in Windows when the form is displayed and resized. Also works in Android, both portrait and landscape.

GDT48 · Accepted Answer · 2022-08-16 08:04:47Z

0

Here's the code snippet below that works well on Android for the Maui, you can refer to it:

 <Grid Margin="20" >

        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Grid Grid.Row="0" ColumnDefinitions="*,2*,3*" Grid.ColumnSpan="3">
            <Label Text="Column 1 Outer" Grid.Row="0" Grid.Column="0"/>
            <Label Text="Column 2 Outer" Grid.Row="0" Grid.Column="1"/>
            <Label Text="Column 3 Outer" Grid.Row="0" Grid.Column="2"/>
        </Grid>
        <ScrollView Grid.Row="1" Orientation="Horizontal" Grid.ColumnSpan="3">
            <Grid ColumnDefinitions="*,2*,3*">
                <Label Text="Column 1 Horizontal" Grid.Row="0" Grid.Column="0"/>
                <Label Text="Column 2 Horizontal" Grid.Row="0" Grid.Column="1"/>
                <Label Text="Column 3 Horizontal" Grid.Row="0" Grid.Column="2"/>
            </Grid>
        </ScrollView>
        <ScrollView Grid.Row="2" Orientation="Vertical" Grid.ColumnSpan="3">
            <Grid ColumnDefinitions="*,2*,3*">
                <Label Text="Column 1 Vertical" Grid.Row="0" Grid.Column="0"/>
                <Label Text="Column 2 Vertical" Grid.Row="0" Grid.Column="1"/>
                <Label Text="Column 3 Vertical" Grid.Row="0" Grid.Column="2"/>
            </Grid>
        </ScrollView>
    </Grid>

edited Aug 16, 2022 at 8:04

GDT48

452 silver badges7 bronze badges

answered Aug 10, 2022 at 2:55

Alexandar May

10.5k1 gold badge14 silver badges23 bronze badges

2 Comments

GDT48 Over a year ago

I use the Windows Platform when developing, tends to be quicker to load.

GDT48 Over a year ago

I tried this answer but gor the same result in Wndows, Android - Portrait and Android - Landscape.

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