OpenLayers experimental greedy gesture handling

jQuery(function($) {

	if(WPGMZA.isTouchDevice())
	{
		$(window).on("init.wpgmza", function(event) {
			
			var map = event.target;
			
			// On touch devices, require two fingers to drag and pan
			// NB: Temporarily removed due to inconsistent behaviour
			map.olMap.getInteractions().forEach(function(interaction) {
				
				if(interaction instanceof ol.interaction.DragPan)
					self.olMap.removeInteraction(interaction);
				
			});
			
			map.olMap.addInteraction(new ol.interaction.DragPan({
				
				condition: function(olBrowserEvent) {
					
					var allowed = olBrowserEvent.originalEvent.touches.length == 2;
					
					if(!allowed)
						self.showGestureOverlay();
					
					return allowed;
				}
				
			}));
			
			map.gestureOverlay.text(WPGMZA.localized_strings.use_two_fingers);
		
		});
		
	}

});