feature: long press to save original illust

Pixiview.iOS/Effects/LongPressEffectImplement.cs

@@ -0,0 +1,58 @@
+using System.Threading.Tasks;
+using Pixiview.iOS.Effects;
+using Pixiview.Utils;
+using UIKit;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.iOS;
+
+[assembly: ResolutionGroupName("Pixiview")]
+[assembly: ExportEffect(typeof(LongPressEffectImplement), "LongPressEffect")]
+namespace Pixiview.iOS.Effects
+{
+    public class LongPressEffectImplement : PlatformEffect
+    {
+        private bool attached;
+        private readonly UILongPressGestureRecognizer longPressGesture;
+
+        public LongPressEffectImplement()
+        {
+            longPressGesture = new UILongPressGestureRecognizer(OnLongPressed);
+        }
+
+        protected override void OnAttached()
+        {
+            if (!attached)
+            {
+                attached = true;
+                Container.AddGestureRecognizer(longPressGesture);
+            }
+        }
+
+        protected override void OnDetached()
+        {
+            if (attached)
+            {
+                attached = false;
+                Container.RemoveGestureRecognizer(longPressGesture);
+            }
+        }
+
+        private void OnLongPressed(UILongPressGestureRecognizer e)
+        {
+            if (e.State != UIGestureRecognizerState.Began)
+            {
+                return;
+            }
+            var element = Element;
+            if (element != null)
+            {
+                var command = LongPressEffect.GetCommand(element);
+                if (command != null)
+                {
+                    var o = LongPressEffect.GetCommandParameter(element);
+                    command.Execute(o);
+                }
+            }
+        }
+    }
+}

Pixiview.iOS/Pixiview.iOS.csproj

@@ -79,6 +79,7 @@
     <Compile Include="Renderers\AppShellRenderer.cs" />
     <Compile Include="Renderers\AppShellSection\AppShellSectionRootHeader.cs" />
     <Compile Include="Renderers\SegmentedControlRenderer.cs" />
+    <Compile Include="Effects\LongPressEffectImplement.cs" />
   </ItemGroup>
   <ItemGroup>
     <InterfaceDefinition Include="Resources\LaunchScreen.storyboard" />
@@ -148,6 +149,7 @@
     <Folder Include="Renderers\" />
     <Folder Include="Services\" />
     <Folder Include="Renderers\AppShellSection\" />
+    <Folder Include="Effects\" />
   </ItemGroup>
   <ItemGroup>
     <BundleResource Include="Resources\fa-light-300.ttf" />

Pixiview.iOS/Services/EnvironmentService.cs

@@ -29,29 +29,28 @@ namespace Pixiview.iOS.Services
         #region - Theme -
 
         [SuppressMessage("Code Notifications", "XI0002:Notifies you from using newer Apple APIs when targeting an older OS version", Justification = "<Pending>")]
-        public Theme GetApplicationTheme()
+        public OSAppTheme GetApplicationTheme()
         {
             if (UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
             {
                 var currentController = Platform.GetCurrentUIViewController();
                 if (currentController == null)
                 {
-                    return Theme.Light;
+                    return OSAppTheme.Unspecified;
                 }
+
                 var style = currentController.TraitCollection.UserInterfaceStyle;
                 if (style == UIUserInterfaceStyle.Dark)
                 {
-                    return Theme.Dark;
+                    return OSAppTheme.Dark;
                 }
-                else
+                else if (style == UIUserInterfaceStyle.Light)
                 {
-                    return Theme.Light;
+                    return OSAppTheme.Light;
                 }
             }
-            else
-            {
-                return Theme.Light;
-            }
+
+            return OSAppTheme.Unspecified;
         }
 
         public void SetStatusBarStyle(StatusBarStyles style)