Share.ios.cs

using System.Collections.Generic;
using System.Drawing;
using System.Threading.Tasks;
using Foundation;
using LinkPresentation;
using UIKit;

namespace Xamarin.Essentials
{
    public static partial class Share
    {
        static async Task PlatformRequestAsync(ShareTextRequest request)
        {
            var src = new TaskCompletionSource<bool>();
            var items = new List<NSObject>();
            if (!string.IsNullOrWhiteSpace(request.Text))
            {
                items.Add(GetShareItem(new NSString(request.Text), request.Title));
            }

            if (!string.IsNullOrWhiteSpace(request.Uri))
            {
                items.Add(GetShareItem(NSUrl.FromString(request.Uri), request.Title));
            }

            var activityController = new UIActivityViewController(items.ToArray(), null)
            {
                CompletionWithItemsHandler = (a, b, c, d) =>
                {
                    src.TrySetResult(true);
                }
            };

            var vc = Platform.GetCurrentViewController();

            if (activityController.PopoverPresentationController != null)
            {
                activityController.PopoverPresentationController.SourceView = vc.View;

                if (request.PresentationSourceBounds != Rectangle.Empty || Platform.HasOSVersion(13, 0))
                    activityController.PopoverPresentationController.SourceRect = request.PresentationSourceBounds.ToPlatformRectangle();
            }

            await vc.PresentViewControllerAsync(activityController, true);
            await src.Task;
        }

        static async Task PlatformRequestAsync(ShareMultipleFilesRequest request)
        {
            var src = new TaskCompletionSource<bool>();

            var items = new List<NSObject>();

            foreach (var file in request.Files)
            {
                var fileUrl = NSUrl.FromFilename(file.FullPath);
                items.Add(GetShareItem(fileUrl, request.Title));
            }

            var activityController = new UIActivityViewController(items.ToArray(), null)
            {
                CompletionWithItemsHandler = (a, b, c, d) =>
                {
                    src.TrySetResult(true);
                }
            };

            var vc = Platform.GetCurrentViewController();

            if (activityController.PopoverPresentationController != null)
            {
                activityController.PopoverPresentationController.SourceView = vc.View;

                if (request.PresentationSourceBounds != Rectangle.Empty || Platform.HasOSVersion(13, 0))
                    activityController.PopoverPresentationController.SourceRect = request.PresentationSourceBounds.ToPlatformRectangle();
            }

            await vc.PresentViewControllerAsync(activityController, true);
            await src.Task;
        }

        static NSObject GetShareItem(NSString obj, string title)
            => new ShareActivityItemSource(obj, string.IsNullOrWhiteSpace(title) ? obj : title);

        static NSObject GetShareItem(NSObject obj, string title)
            => string.IsNullOrWhiteSpace(title)
                ? obj
                : new ShareActivityItemSource(obj, title);
    }

    class ShareActivityItemSource : UIActivityItemSource
    {
        readonly NSObject item;
        readonly string title;

        internal ShareActivityItemSource(NSObject item, string title)
        {
            this.item = item;
            this.title = title;
        }

        public override NSObject GetItemForActivity(UIActivityViewController activityViewController, NSString activityType) => item;

        public override NSObject GetPlaceholderData(UIActivityViewController activityViewController) => item;

        public override LPLinkMetadata GetLinkMetadata(UIActivityViewController activityViewController)
        {
            var meta = new LPLinkMetadata();
            if (!string.IsNullOrWhiteSpace(title))
                meta.Title = title;
            if (item is NSUrl url)
                meta.Url = url;

            return meta;
        }
    }
}