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How to change selected image in .NET MAUI ListView (SfListView) ?

2 mins read

You can change the selected item image in .NET MAUI ListView (SfListView) using Converters.

XAML

Binding IsSelected Property and converter to Label Text.

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="ListViewMaui.MainPage"
             xmlns:local="clr-namespace:ListViewMaui"
             xmlns:syncfusion="clr- namespace:Syncfusion.Maui.ListView;assembly=Syncfusion.Maui.ListView"
             BackgroundColor="{DynamicResource SecondaryColor}">
 
    <ContentPage.Resources>
        <ResourceDictionary>
            <local:IconColorConverter x:Key="IconColorConverter"/>
            <local:SelectionIconConverter x:Key="SelectionIconConverter"/>
            <DataTemplate x:Name="ItemTemplate" x:Key="ItemTemplate" >
                …                
                 <Label Grid.Row="0" Grid.Column="2" Padding='{OnPlatform UWP="0,10,0,0"}'
                               WidthRequest="40" HeightRequest="40" HorizontalOptions="Start" 
                               HorizontalTextAlignment="Start" VerticalOptions="Center" VerticalTextAlignment="Center"
                               FontSize="{OnPlatform Android=Large, UWP=Medium, WPF=Medium, iOS=Large, MacCatalyst=Large}"
                               Text="{Binding IsSelected, Converter={StaticResource SelectionIconConverter}}"
                               TextColor="{Binding Path=IsSelected, Converter={StaticResource IconColorConverter}}"
                               FontFamily="{OnPlatform iOS=Sync FontIcons, MacCatalyst=Sync FontIcons, Android=Sync FontIcons.ttf#, UWP=Sync FontIcons.ttf#Sync FontIcons}"/>              
               …
            </DataTemplate>
        </ResourceDictionary>
    </ContentPage.Resources>    
                       
    <syncfusion:SfListView x:Name="listView"
          Grid.Row="1"
          AutoFitMode="None"
          SelectionGesture="Tap"
          SelectionMode="Multiple"
          SelectedItems="{Binding SelectedItems}"
          SelectionBackground ="#E4E4E4"
          ItemTemplate="{StaticResource ItemTemplate}"
          ItemSize="65" ItemSpacing="0,0,0,1"
          IsStickyHeader="True" ItemsSource="{Binding MusicInfo}">
     </syncfusion:SfListView>
</ContentPage>

C#

Defining IsSelected property in Model with INotifyPropertyChanged.

public class Musiqnfo : INotifyPropertyChanged
{               
     private bool isSelected;
 
     public bool IsSelected
     {
         get { return isSelected; }
         set
         {
             isSelected = value;
             RaisePropertyChanged("IsSelected");
         }
     }
 
     public event PropertyChangedEventHandler PropertyChanged;
 
     private void RaisePropertyChanged(String name)
     {
         if (PropertyChanged != null)
             this.PropertyChanged(this, new PropertyChangedEventArgs(name));
     }
 }
 

Updating the IsSelected value in ListView_SelectionChanged method.

public class SfListViewSelectionBehavior : Behavior<ContentPage>
{
     ListView.SelectionChanged += ListView_SelectionChanged;
 
     ListView.SelectionChanged -= ListView_SelectionChanged;
            
      private void ListView_SelectionChanged(object sender, ItemSelectionChangedEventArgs e)
      {
          if (ListView.SelectionMode == Syncfusion.Maui.ListView.SelectionMode.Multiple)
          {
              SelectionViewModel.HeaderInfo = ListView.SelectedItems.Count + " item(s) selected";
              for (int i = 0; i < e.AddedItems.Count; i++)
              {
                  var item = e.AddedItems[i];
                  (item as Musiqnfo).IsSelected = true;
               }
               for (int i = 0; i < e.RemovedItems.Count; i++)
               {
                  var item = e.RemovedItems[i];
                  (item as Musiqnfo).IsSelected = false;
               }
           }
      }
}

Setting Image based on the IsSelected value in Converter.

public class IconColorConverter : IValueConverter
{
     public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
     {
          if ((bool)value)
             return Color.FromArgb("#1a75ff");
         else
              return Color.FromArgb("#b3b3b3");
      }
 
      public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
      {
          throw new NotImplementedException();
      }
  }
    public class SelectionIconConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if ((bool)value)
                return "\ue748";
            else
                return "\ue718";
        }
 
      public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
      {
          throw new NotImplementedException();
      }
 }

View sample in GitHub

Apply selected image in .NET MAUI selected image.

Take a moment to peruse the documentation, to learn more about selection in SfListView with code.

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