[Mobile] Detect touch support

platform/commonUI/mobile/src/AgentService.js

@@ -46,6 +46,7 @@ define(
             this.userAgent = userAgent;
             this.mobileName = matches[0];
             this.$window = $window;
+            this.touchEnabled = ($window.ontouchstart !== undefined);
         }
 
         /**
@@ -92,6 +93,14 @@ define(
             return !this.isPortrait();
         };
 
+        /**
+         * Check if the user's device supports a touch interface.
+         * @returns {boolean} true if touch is supported
+         */
+        AgentService.prototype.isTouch = function () {
+            return this.touchEnabled;
+        };
+
         /**
          * Check if the user agent matches a certain named device,
          * as indicated by checking for a case-insensitive substring

platform/commonUI/mobile/src/DeviceClassifier.js

@@ -37,6 +37,7 @@ define(
          * * `desktop`: Non-mobile devices.
          * * `portrait`: Devices in a portrait-style orientation.
          * * `landscape`: Devices in a landscape-style orientation.
+         * * `touch`: Device supports touch events.
          *
          * @param {platform/commonUI/mobile.AgentService} agentService
          *        the service used to examine the user agent

platform/commonUI/mobile/src/DeviceMatchers.js

@@ -52,6 +52,9 @@ define(function () {
         },
         landscape: function (agentService) {
             return agentService.isLandscape();
+        },
+        touch: function (agentService) {
+            return agentService.isTouch();
         }
     };
 });

platform/commonUI/mobile/src/MCTDevice.js

@@ -47,6 +47,7 @@ define(
          * * `desktop`: Non-mobile devices.
          * * `portrait`: Devices in a portrait-style orientation.
          * * `landscape`: Devices in a landscape-style orientation.
+         * * `touch`: Device supports touch events.
          *
          * @param {AgentService} agentService used to detect device type
          *        based on information about the user agent