epj.Expander.Maui 1.0.3

epj.Expander.Maui

A simple Expander control for .NET MAUI

Summary

This is a simple Expander control for .NET MAUI which can be used standalone as well as like accordion. The header and body are fully customizable and the expanding and collapsing of the body can be animated.

Note: Animations are experimental at the moment and require an explicit opt-in.

<div style="display: flex;"> <img src="https://github.com/ewerspej/epj.Expander.Maui/blob/main/assets/sample_00.PNG" width="360" /> <img src="https://github.com/ewerspej/epj.Expander.Maui/blob/main/assets/1_HybridAccordion.gif" width="800" /> </div>

Platforms

Usage

Registration (not required at this moment)

Registration of the control strictly isn't required, because it only uses standard controls natively supported by .NET MAUI at the moment. However, a registration method is provided in case that some future version requires to do so:

public static MauiApp CreateMauiApp()
{
    var builder = MauiApp.CreateBuilder();
    builder
        .UseMauiApp<App>()
        .UseExpander() // optional: add this
        .ConfigureFonts(fonts =>
        {
            fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
            fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
        });

    return builder.Build();
}

XAML

<maui:Expander
  Command="{Binding Source={RelativeSource AncestorType={x:Type expanderSample:MainViewModel}}, Path=PrintCommand}"
  CommandParameter="{Binding Name}"
  HeaderTapped="Expander_OnHeaderTapped">

  
  <maui:Expander.HeaderContent>
    <Grid
      HeightRequest="80"
      BackgroundColor="Orange">
      <Label
        Text="{Binding Name}"
        VerticalOptions="Center"
        HorizontalOptions="Center" />
    </Grid>
  </maui:Expander.HeaderContent>

  
  <Grid
    HeightRequest="200"
    BackgroundColor="SkyBlue">
    <Label
      Text="{Binding Name}"
      VerticalOptions="Center"
      HorizontalOptions="Center" />
  </Grid>
</maui:Expander>

Properties

Most of these properties are bindable for MVVM goodness. Please let me know if something is missing or not working as expected.

Events

The control exposes two events:

• HeaderTapped: Fires when the header is tapped by the user
• IsExpandedChanged: Fires whenever the IsExpanded property has changed

Animations

Animations are currently experimental, the implementation is not well tested and may be subject to change in the future. Generally, animations come with a performance penalty and when used extensively, they may slow down the application.

Therefore, animations at this time require an explicit opt-in. Anywhere in your code, but ideally in MauiProgram.cs, add the following line of code:

Expander.EnableAnimations();

After that, setting the Animate property to True will take effect:

<maui:Expander
  Animate="True"
  CollapseDuration="100"
  ExpandDuration="200"
  CollapseEasing="{x:Static Easing.SpringOut}"
  ExpandEasing="{x:Static Easing.SpringIn}">
  <maui:Expander.HeaderContent>
    
  </maui:Expander.HeaderContent>
  
</maui:Expander>

Examples

If you are looking for a more extensive example for the potential usage of the control, e.g. if you are looking for a demo of the accordion-style functionality, have a look at the code in this repository. The sample app provides some examples and starting points.