Image elements without dimensions defined in Xamarin forms will now have their dimensions defined by attempting to scale it to the bounding box.

Ooui.Forms/Renderers/ImageRenderer.cs

@@ -29,6 +29,8 @@ namespace Ooui.Forms.Renderers
                 var imageView = new Ooui.Image ();
                 SetNativeControl (imageView);
                 this.Style.Overflow = "hidden";
+
+                Control.Loaded += OnLoad;
             }
 
             if (e.NewElement != null) {
@@ -51,6 +53,30 @@ namespace Ooui.Forms.Renderers
                 SetAspect ();
         }
 
+        void OnLoad(object sender, EventArgs eventArgs)
+        {
+            var args = (TargetEventArgs)eventArgs;
+            var b = Element.Bounds;
+            double scale = 1;
+
+            if (Math.Abs(b.Width) > 0)
+            {
+                scale = b.Width / args.ClientWidth;
+                Element.WidthRequest = b.Width;
+                Element.HeightRequest = scale * args.ClientHeight;
+            }
+            else if (Math.Abs(b.Height) > 0)
+            {
+                scale = b.Height / args.ClientHeight;
+                Element.WidthRequest = scale * args.ClientWidth;
+                Element.HeightRequest = b.Height;
+            }
+            else
+            {
+                // We can't really know what to do in this case
+            }
+        }
+
         void SetAspect ()
         {
             if (_isDisposed || Element == null || Control == null) {

Ooui/Client.js

@@ -37,6 +37,10 @@ const inputEvents = {
     keyup: true,
 };
 
+const elementEvents = {
+    load: true
+}
+
 function getSize () {
     return {
         height: window.innerHeight,
@@ -304,6 +308,12 @@ function msgListen (m) {
                 offsetY: e.offsetY,
             };
         }
+        else if (elementEvents[m.k]) {
+            em.v = {
+                clientHeight: node.clientHeight,
+                clientWidth: node.clientWidth
+            }
+        }
         const ems = JSON.stringify (em);
         send (ems);
         if (debug) console.log ("Event", em);

Ooui/Element.cs

@@ -52,7 +52,12 @@ namespace Ooui
             add => AddEventListener ("keyup", value);
             remove => RemoveEventListener ("keyup", value);
         }
-
+        
+        public event TargetEventHandler Loaded {
+            add => AddEventListener ("load", value);
+            remove => RemoveEventListener ("load", value);
+        }
+        
         public event TargetEventHandler MouseDown {
             add => AddEventListener ("mousedown", value);
             remove => RemoveEventListener ("mousedown", value);

Ooui/EventTarget.cs

@@ -220,8 +220,16 @@ namespace Ooui
             if (handlers != null) {
                 var args = new TargetEventArgs ();
                 if (message.Value is Newtonsoft.Json.Linq.JObject o) {
-                    args.OffsetX = (double)o["offsetX"];
-                    args.OffsetY = (double)o["offsetY"];
+                    if (o["offsetX"] != null)
+                    {
+                        args.OffsetX = (double)o["offsetX"];
+                        args.OffsetY = (double)o["offsetY"];
+                    }
+                    if (o["clientHeight"] != null)
+                    {
+                        args.ClientHeight = (double)o.GetValue("clientHeight");
+                        args.ClientWidth = (double)o.GetValue("clientWidth");
+                    }
                 }
                 foreach (var h in handlers) {
                     h.Invoke (this, args);
@@ -257,5 +265,7 @@ namespace Ooui
     {
         public double OffsetX { get; set; }
         public double OffsetY { get; set; }
+        public double ClientHeight { get; set; }
+        public double ClientWidth { get; set; }
     }
 }