move resizeVertical to LayoutMode

isotope.js

@@ -247,20 +247,6 @@ function isotopeDefinition( Outlayer, getSize, matchesSelector, Item, layoutMode
     this._mode().resize();
   };
 
-  // for vertical layout modes
-  Isotope.prototype.resizeVertical = function() {
-    // don't trigger if size did not change
-    var size = getSize( this.element );
-    // check that this.size and size are there
-    // IE8 triggers resize on body size change, so they might not be
-    var hasSizes = this.size && size;
-    if ( hasSizes && size.innerHeight === this.size.innerHeight ) {
-      return;
-    }
-
-    this.layout();
-  };
-
   return Isotope;
 }
 

layout-mode.js

@@ -63,6 +63,20 @@ layoutMode.create = function( namespace, options ) {
     this._outlayerMethod( 'resize', arguments );
   };
 
+  // for horizontal layout modes, check vertical size
+  LayoutMode.prototype.resizeVertical = function() {
+    // don't trigger if size did not change
+    var size = getSize( this.isotope.element );
+    // check that this.size and size are there
+    // IE8 triggers resize on body size change, so they might not be
+    var hasSizes = this.isotope.size && size;
+    if ( hasSizes && size.innerHeight === this.isotope.size.innerHeight ) {
+      return;
+    }
+
+    this.isotope.layout();
+  };
+
   // ----- measurements ----- //
 
   LayoutMode.prototype.getColumnWidth = function() {

layout-modes/cells-by-column.js

@@ -35,7 +35,7 @@ function cellsByColumnDefinition( layoutMode ) {
   };
 
   CellsByColumn.prototype.resize = function() {
-    this.isotope.resizeVertical();
+    this.resizeVertical();
   };
 
   return CellsByColumn;

layout-modes/fit-columns.js

@@ -37,7 +37,7 @@ function fitColumnsDefinition( layoutMode ) {
   };
 
   FitColumns.prototype.resize = function() {
-    this.isotope.resizeVertical();
+    this.resizeVertical();
   };
 
   return FitColumns;

layout-modes/horizontal.js

@@ -27,7 +27,7 @@ function horizontalDefinition( layoutMode ) {
   };
 
   Horizontal.prototype.resize = function() {
-    this.isotope.resizeVertical();
+    this.resizeVertical();
   };
 
   return Horizontal;