extlib/leaflet/src/dom/DomEvent.DoubleTap.js

   1 L.Util.extend(L.DomEvent, {
   2         // inspired by Zepto touch code by Thomas Fuchs
   3         addDoubleTapListener: function(obj, handler, id) {
   4                 var last,
   5                         doubleTap = false,
   6                         delay = 250,
   7                         touch,
   8                         pre = '_leaflet_',
   9                         touchstart = 'touchstart',
  10                         touchend = 'touchend';
  11
  12                 function onTouchStart(e) {
  13                         if (e.touches.length != 1) return;
  14
  15                         var now = Date.now(),
  16                                 delta = now - (last || now);
  17
  18                         touch = e.touches[0];
  19                         doubleTap = (delta > 0 && delta <= delay);
  20                         last = now;
  21                 }
  22                 function onTouchEnd(e) {
  23                         if (doubleTap) {
  24                                 touch.type = 'dblclick';
  25                                 handler(touch);
  26                                 last = null;
  27                         }
  28                 }
  29                 obj[pre + touchstart + id] = onTouchStart;
  30                 obj[pre + touchend + id] = onTouchEnd;
  31
  32                 obj.addEventListener(touchstart, onTouchStart, false);
  33                 obj.addEventListener(touchend, onTouchEnd, false);
  34         },
  35
  36         removeDoubleTapListener: function(obj, id) {
  37                 var pre = '_leaflet_';
  38                 obj.removeEventListener(obj, obj[pre + 'touchstart' + id], false);
  39                 obj.removeEventListener(obj, obj[pre + 'touchend' + id], false);
  40         }
  41 });