customize-the-itemtemplate-unbound-treeview-xamarin

This repository demonstrates how to customize the item template in an unbound Xamarin.Forms TreeView (SfTreeView) control. It provides a sample implementation that shows how to define and style TreeView nodes directly in XAML without data binding, enabling flexible and visually distinct hierarchical layouts.

Sample

XAML

<ContentPage.Resources>
        <ResourceDictionary>
            <helper:TextColorConverter x:Key="textColorConverter"/>
        </ResourceDictionary>
    </ContentPage.Resources>

    <StackLayout>
    <syncfusion:SfTreeView x:Name="treeView">
        <syncfusion:SfTreeView.ItemTemplate>
            <DataTemplate>
                <Grid>
                    <Label Text="{Binding Content}" TextColor="{Binding Level, Converter={StaticResource textColorConverter}}" VerticalOptions="Center"/>
                </Grid>
            </DataTemplate>
        </syncfusion:SfTreeView.ItemTemplate>

        <syncfusion:SfTreeView.Nodes>
            <treeviewengine:TreeViewNode Content="Australia" IsExpanded="True">
                <treeviewengine:TreeViewNode.ChildNodes>
                    <treeviewengine:TreeViewNode Content="New South Wales">
                        <treeviewengine:TreeViewNode.ChildNodes>
                            <treeviewengine:TreeViewNode Content="Sydney"/>
                            <treeviewengine:TreeViewNode Content="Canberra"/>
                            <treeviewengine:TreeViewNode Content="Newcastle–Maitland"/>
                        </treeviewengine:TreeViewNode.ChildNodes>
                    </treeviewengine:TreeViewNode>
                    <treeviewengine:TreeViewNode Content="Victoria">
                        <treeviewengine:TreeViewNode.ChildNodes>
                            <treeviewengine:TreeViewNode Content="Melbourne"/>
                        </treeviewengine:TreeViewNode.ChildNodes>
                    </treeviewengine:TreeViewNode>
                </treeviewengine:TreeViewNode.ChildNodes>
            </treeviewengine:TreeViewNode>            
        </syncfusion:SfTreeView.Nodes>
    </syncfusion:SfTreeView>
    </StackLayout>

TextColorConverter

public class TextColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var level = (int)value;
        if (level == 0) return Color.Red;
        else if (level == 1) return Color.Blue;
        else return Color.Green;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Requirements to run the demo

To run the demo, refer to System Requirements for Xamarin

Troubleshooting

Path too long exception

If you are facing path too long exception when building this example project, close Visual Studio and rename the repository to short and build the project.