when only one touch is on the screen the whole process can be simplified

hammerjs · Jul 25, 2014 · b298dfa · b298dfa
1 parent 57b0cbe
commit b298dfa
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/input/touch.js b/src/input/touch.js
@@ -46,10 +46,16 @@ inherit(TouchInput, Input, {
 function normalizeTouches(ev, touchInput, type) {
     var i, len;
     var targetIds = touchInput.targetIds;
+    var allTouches = toArray(ev.touches);
     var targetTouches = toArray(ev.targetTouches);
     var changedTouches = toArray(ev.changedTouches);
     var changedTargetTouches = [];
 
+    // when there is only one touch, the process can be simplified
+    if (type & (INPUT_START | INPUT_MOVE) && allTouches.length === 1) {
+        return [allTouches, allTouches];
+    }
+
     // collect touches
     if (type === INPUT_START) {
         for (i = 0, len = targetTouches.length; i < len; i++) {