diff --git a/mirage/__init__.py b/mirage/__init__.py
index 638887f..78a238b 100755
--- a/mirage/__init__.py
+++ b/mirage/__init__.py
@@ -1644,21 +1644,10 @@
         self.layout.move(self.imageview, x_shift, y_shift)
 
     def available_image_width(self):
-        width = self.window.get_size()[0]
-        if not self.fullscreen_mode:
-            if self.thumbpane_show:
-                width -= self.thumbscroll.size_request().width
-        return width
+        return self.layout.get_allocation().width
 
     def available_image_height(self):
-        height = self.window.get_size()[1]
-        if not self.fullscreen_mode:
-            height -= self.menubar.size_request().height  # TODO
-            if self.toolbar_show:
-                height -= self.toolbar.size_request().height
-            if self.statusbar_show:
-                height -= self.statusbar.size_request().height
-        return height
+        return self.layout.get_allocation().height
 
     def save_image(self, action, parameter, data):
         if self.action_group.lookup_action("save-image").get_enabled():