[Android/iOS] RefreshView

[PureWeen]

Description of Change

RefreshView represents a container control that provides pull-to-refresh functionality for scrollable content.

fixes #5882

Screenshots

Android

iOS

API Changes

public class RefreshView : ContentView
{
	public static readonly BindableProperty CommandProperty;
	public ICommand Command { get; set; }

	public static readonly BindableProperty CommandParameterProperty;
	public object CommandParameter { get; set; }

	public static readonly BindableProperty IsEnabledProperty;
	public bool IsEnabled { get; set; }

	public bool IsRefreshing { get; set; }

	public Color BackgroundColor {get; set;}
	public Color RefreshColor {get; set;}
}

Platforms Affected

• Core/XAML (all platforms)
• iOS
• Android

Behavioral/Visual Changes

None

Before/After Screenshots

Not applicable

Testing Procedure

In Core Gallery access to the RefreshView samples. Try to pull to refresh the content. A load indicator should appear and refresh the content.

PR Checklist

• Has automated tests
• Rebased on top of the target branch at time of PR
• Changes adhere to coding standard

[hartez]

Some very minor whitespace things and possibly an opportunity to simplify.

[hartez]

Where's the UWP implementation?

[PureWeen]

@hartez

Where's the UWP implementation?

That will show up in separate PR so we can workout some WinUI issues and not hold up iOS/Android

[jsuarezruiz]

UWP implementation was included. It also had a Platform Specific to set the pull to refresh orientation.

In UWP we used the Microsoft.UI.Xaml NuGet. After several tests, we found problems to solve. To avoid delaying this functionality we have decided to split into two branches. For now, in this PR we will add the functionality in Android and iOS and as for UWP, we created another branch (https://github.com/xamarin/Xamarin.Forms/blob/swiperefresh-uwp/Xamarin.Forms.Platform.UAP/RefreshViewRenderer.cs) and are in conversation with the WinUI team to find the best solution in UWP.