1 files changed, 27 insertions, 0 deletions
diff --git a/js/ui/keys.js b/js/ui/keys.js
index 77922c7..c157671 100644
--- a/js/ui/keys.js
+++ b/js/ui/keys.js
@@ -204,6 +204,33 @@ var keys = (function(){
     }
   }
 
+  function cancelZoom() {
+    var d = document,
+        viewport,
+        content,
+        maxScale = ',maximum-scale=',
+        maxScaleRegex = /,*maximum\-scale\=\d*\.*\d*/;
+
+    // this should be a focusable DOM Element
+    if (!this.addEventListener || !d.querySelector) {
+      return;
+    }
+
+    viewport = d.querySelector('meta[name="viewport"]');
+    content = viewport.content;
+
+    function changeViewport(event) {
+      // http://nerd.vasilis.nl/prevent-ios-from-zooming-onfocus/
+      viewport.content = content + (event.type == 'blur' ? (content.match(maxScaleRegex, '') ? '' : maxScale + 10) : maxScale + 1);
+    }
+
+    // We could use DOMFocusIn here, but it's deprecated.
+    this.addEventListener('focus', changeViewport, true);
+    this.addEventListener('blur', changeViewport, false);
+  }
+  
+  cancelZoom.bind(cursor_input)();
+
   return keys
 })()