Merge pull request xamarin#9 from jsuarezruiz/gtk-force-scrollview-re…

…sizing

ScrolledWindow needs to be resized on its parent allocation, and forc…

Xamarin.Forms.Platform.GTK/Renderers/ScrollViewRenderer.cs

@@ -2,14 +2,14 @@
 using System;
 using System.ComponentModel;
 using Xamarin.Forms.Platform.GTK.Extensions;
-using Xamarin.Forms.Platform.GTK.Helpers;
 
 namespace Xamarin.Forms.Platform.GTK.Renderers
 {
     public class ScrollViewRenderer : ViewRenderer<ScrollView, ScrolledWindow>
     {
         private VisualElement _currentView;
         private Viewport _viewPort;
+        private Gdk.Rectangle _lastAllocation;
 
         protected IScrollViewController Controller
         {
@@ -57,6 +57,40 @@ protected override void OnElementChanged(ElementChangedEventArgs<ScrollView> e)
             }
         }
 
+        protected override void OnSizeAllocated(Gdk.Rectangle allocation)
+        {
+            base.OnSizeAllocated(allocation);
+
+            if (IsAnimationRunning(Element))
+            {
+                return;
+            }
+
+            if (_lastAllocation != allocation)
+            {
+                _lastAllocation = allocation;
+
+                Rectangle bounds = Element.Bounds;
+                Container.MoveTo((int)bounds.X, (int)bounds.Y);
+
+                for (var i = 0; i < ElementController.LogicalChildren.Count; i++)
+                {
+                    var child = ElementController.LogicalChildren[i] as VisualElement;
+
+                    if (child != null)
+                    {
+                        var renderer = Platform.GetRenderer(child);
+                        renderer?.Container.SetSize(child.Bounds.Width, child.Bounds.Height);
+
+                        if (!IsAnimationRunning(renderer.Element))
+                        {
+                            renderer?.Container.MoveTo(child.Bounds.X, child.Bounds.Y);
+                        }
+                    }
+                }
+            }
+        }
+
         protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
         {
             base.OnElementPropertyChanged(sender, e);