How to implement Multi-Line support in Xamarin ComboBox?

This article will guide you through the process of implementing multi-line text support in Xamarin.Forms ComboBox’s input field.

Step 1: Create a custom SfComboBox control.

A custom ComboBox control can be created by sub-classing the SfComboBox control as shown in the following codes.

C#

public class SfCustomComboBox:SfComboBox
{

}

XAML

<local:SfCustomComboBox 
    DisplayMemberPath="Description" 
    DataSource="{Binding Items}" 
    HeightRequest="60">
    <local:SfCustomComboBox.ItemTemplate>
        <DataTemplate>
            <Label Text="{Binding Description}"
              TextColor="Black"
              LineBreakMode="WordWrap"
              VerticalTextAlignment="Center"
              Margin="5" />
        </DataTemplate>
    </local:SfCustomComboBox.ItemTemplate>
</local:SfCustomComboBox>

The custom SfComboBox control is created in .NET Standard library project and is simply a SfComboBox control. Customization of the control will be carried out in the custom renderer, so no additional implementation is required in the custom SfComboBox control.

Step 2: Create a custom renderer in Android.

[assembly: ExportRenderer(typeof(SfCustomComboBox), typeof(CustomRenderer))]
namespace ComboWordWrap.Droid
{
    public class CustomRenderer:SfComboBoxRenderer
    {
        public CustomRenderer(Context context) : base(context)
        {
        }

        protected override void OnElementChanged(ElementChangedEventArgs<Syncfusion.XForms.ComboBox.SfComboBox> e)
        {
            base.OnElementChanged(e);
            Control.GetAutoEditText().SetLines(8);
            Control.GetAutoEditText().SetHorizontallyScrolling(false);
        }
    }
}

Output

Download the complete sample in GitHub

Conclusion

Hope you enjoyed learning how to implement Multi-Line support in Xamarin ComboBox in Android.

You can refer to our Xamarin ComboBox feature tour page to know about its other groundbreaking feature representations. You can also explore our Xamarin ComboBox example to understand how to present and manipulate data.

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.

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