For now, I just need to update the font sizes, so I created a custom class that inherits the Legend and makes updates to it this way. Other functionality will be harder to implement but you might be able to use the same inheritance. I'm doing something similar with the SearchView right now and it is proving a bit more challenging.
using System;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Toolkit.Maui;
namespace OTISMobile.Helpers
{
public class CustomLegend : Legend
{
protected override void OnBindingContextChanged()
{
base.OnBindingContextChanged();
DataTemplate CustomLayerDataTemplate = new DataTemplate(() =>
{
var nameLabel = new Label { FontSize = 32, VerticalOptions = LayoutOptions.Center };
nameLabel.SetBinding(Label.TextProperty, $"{nameof(LegendEntry.Content)}.{nameof(Layer.Name)}");
return nameLabel;
});
DataTemplate CustomSublayerItemTemplate = new DataTemplate(() =>
{
var nameLabel = new Label { FontSize = 28, VerticalOptions = LayoutOptions.Center, Padding = new Thickness(20, 0, 0, 0) };
nameLabel.SetBinding(Label.TextProperty, $"{nameof(LegendEntry.Content)}.{nameof(ILayerContent.Name)}");
return nameLabel;
});
DataTemplate CustomLegendInfoItemTemplate = new DataTemplate(() =>
{
StackLayout sl = new StackLayout() { Orientation = StackOrientation.Horizontal, Padding = new Thickness(20, 0, 0, 0) };
var symbol = new SymbolDisplay { WidthRequest = 60, HeightRequest = 60, VerticalOptions = LayoutOptions.Center, Margin = new Thickness(0, 0, 5, 0) };
symbol.SetBinding(SymbolDisplay.SymbolProperty, $"{nameof(LegendEntry.Content)}.{nameof(LegendInfo.Symbol)}");
sl.Children.Add(symbol);
var nameLabel = new Label { FontSize = 24, VerticalOptions = LayoutOptions.Center };
nameLabel.SetBinding(Label.TextProperty, $"{nameof(LegendEntry.Content)}.{nameof(LegendInfo.Name)}");
sl.Children.Add(nameLabel);
return sl;
});
LayerItemTemplate = CustomLayerDataTemplate;
LegendInfoItemTemplate = CustomLegendInfoItemTemplate;
SublayerItemTemplate = CustomSublayerItemTemplate;
}
}
}
