add ability to provide custom mask (i.e. gradient layer)

PrismLibrary · Jun 6, 2019 · 24e54a1 · 24e54a1
1 parent 1a49f73
commit 24e54a1
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Showing 2 changed files with 20 additions and 4 deletions.
diff --git a/Source/Xamarin/Prism.Forms/Services/Dialogs/DialogService.cs b/Source/Xamarin/Prism.Forms/Services/Dialogs/DialogService.cs
@@ -238,12 +238,18 @@ private ContentPage GetCurrentPage(Page page = null)
 
         private void InsertPopupViewInCurrentPage(ContentPage currentPage, View popupView, bool hideOnBackgroundTapped, Action<IDialogParameters> callback)
         {
-            Style overlayStyle = GetOverlayStyle(popupView);
+            View mask = DialogLayout.GetMask(popupView);
 
-            var mask = new BoxView
+            if(mask is null)
             {
-                Style = overlayStyle
-            };
+                Style overlayStyle = GetOverlayStyle(popupView);
+
+                mask = new BoxView
+                {
+                    Style = overlayStyle
+                };
+            }
+
             mask.SetBinding(VisualElement.WidthRequestProperty, new Binding { Path = "Width", Source = currentPage });
             mask.SetBinding(VisualElement.HeightRequestProperty, new Binding { Path = "Height", Source = currentPage });
 

diff --git a/Source/Xamarin/Prism.Forms/Services/Dialogs/Xaml/DialogLayout.cs b/Source/Xamarin/Prism.Forms/Services/Dialogs/Xaml/DialogLayout.cs
@@ -42,5 +42,15 @@ public static Style GetMaskStyle(BindableObject bindable) =>
 
         public static void SetMaskStyle(BindableObject bindable, Style value) =>
             bindable.SetValue(MaskStyleProperty, value);
+
+        public static readonly BindableProperty MaskProperty =
+            BindableProperty.CreateAttached("Mask", typeof(View), typeof(DialogLayout), null);
+
+        public static View GetMask(BindableObject bindable) =>
+            (View)bindable.GetValue(MaskProperty);
+
+        public static void SetMask(BindableObject bindable, View value) =>
+            bindable.SetValue(MaskProperty, value);
+
     }
 }