syncfusionexamples/listview-itemssource-in-carousel-xamarin

This repository contains sample about how to share items source among Xamarin.Forms ListView with carousel page (SfListView)

How to share items source among Xamarin.Forms ListView with carousel page (SfListView)

You can programmatically split the collections of items among the Xamarin.Forms SfListView loaded in CarouselPage.

You can also refer the following article.

https://www.syncfusion.com/kb/11789/how-to-share-items-source-among-xamarin-forms-listview-with-carousel-page-sflistview

XAML

Define CarouselPage and load the ListViewPage in CarouselPage.ItemTemplate.

<CarouselPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:local="clr-namespace:ListViewXamarin"
              x:Class="ListViewXamarin.ListViewCarousel">
    <CarouselPage.ItemTemplate>
        <DataTemplate>
            <local:ListViewPage/>
        </DataTemplate>
    </CarouselPage.ItemTemplate>
</CarouselPage>

XAML

SfListView is defined in the ListViewPage with binding of (.)

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:ListViewXamarin"
             xmlns:syncfusion="clr-namespace:Syncfusion.ListView.XForms;assembly=Syncfusion.SfListView.XForms"
             x:Class="ListViewXamarin.ListViewPage">
	 <ContentPage.Content>
        <StackLayout>
            <syncfusion:SfListView x:Name="listView" ItemSize="100" ItemsSource="{Binding .}">
                <syncfusion:SfListView.LayoutManager>
                    <syncfusion:GridLayout SpanCount="3"/>
                </syncfusion:SfListView.LayoutManager>
                <syncfusion:SfListView.ItemTemplate >
                    <DataTemplate>
                        <Grid x:Name="grid">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="0.3*" />
                                <ColumnDefinition Width="0.7*" />
                            </Grid.ColumnDefinitions>
                            <Image Source="{Binding ContactImage}" VerticalOptions="Center" HorizontalOptions="Center" HeightRequest="50" WidthRequest="50"/>
                            <Grid Grid.Column="1" RowSpacing="1" Padding="10,0,0,0" VerticalOptions="Center">
                                <Label LineBreakMode="NoWrap" TextColor="#474747" Text="{Binding ContactName}"/>
                                <Label Grid.Row="1" Grid.Column="0" TextColor="#474747" LineBreakMode="NoWrap" Text="{Binding ContactNumber}"/>
                            </Grid>
                        </Grid>
                    </DataTemplate>
                </syncfusion:SfListView.ItemTemplate>
            </syncfusion:SfListView>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

C#

In the OnSizeAllocated override, send page height to ViewModel class to determine the items count to split the ItemsSource for the CarouselPage.

public partial class ListViewCarousel : CarouselPage
{
    PagesViewModel pagesViewModel;

    public ListViewCarousel()
    {
        InitializeComponent();
    }

    protected override void OnSizeAllocated(double width, double height)
    {
        if (height > 0 && BindingContext == null)
        {
            pagesViewModel = new PagesViewModel(height);
            BindingContext = pagesViewModel;
            ItemsSource = pagesViewModel.CarouselPages;
        }
        base.OnSizeAllocated(width, height);
    }
}

C#

In carousel PagesViewModel determines ItemsPerPage count based on ItemSize and SpanCount which determines the number of pages based on the Items count. PagesViewModel defines the collection for each page and add to the collection which bound to the SfListView.ItemsSource.

public class PagesViewModel
{
    public ObservableCollection<List<Contacts>> CarouselPages { get; set; }

    public PagesViewModel(double height)
    {
        int j = 0;
        int itemsPerPage = (int)(height / 100) * 3;
        int temp = itemsPerPage;
        CarouselPages = new ObservableCollection<List<Contacts>>();
        var contactsviewmodel = new ContactsViewModel();
          
        var pageCount = Math.Ceiling((double)contactsviewmodel.ContactsInfo.Count / itemsPerPage);

        for (int i = 0; i < pageCount; i++)
        {
            var source = contactsviewmodel.ContactsInfo.Skip(j).Take(temp);
            var items = source.AsEnumerable().ToList();
            CarouselPages.Add(items);
            j += itemsPerPage;
        }
    }
}

Output