Bug 891882 - Enable touch event on B2G desktop r=vingtetun

b2g/app/b2g.js

@@ -287,14 +287,10 @@ pref("image.mem.min_discard_timeout_ms", 86400000); /* 24h, we rely on the out o
 pref("image.mem.max_decoded_image_kb", 30000); /* 30MB seems reasonable */
 pref("image.onload.decode.limit", 24); /* don't decode more than 24 images eagerly */
 
-// XXX this isn't a good check for "are touch events supported", but
-// we don't really have a better one at the moment.
-#ifdef MOZ_WIDGET_GONK
 // enable touch events interfaces
 pref("dom.w3c_touch_events.enabled", 1);
 pref("dom.w3c_touch_events.safetyX", 0); // escape borders in units of 1/240"
 pref("dom.w3c_touch_events.safetyY", 120); // escape borders in units of 1/240"
-#endif
 
 #ifdef MOZ_SAFE_BROWSING
 // Safe browsing does nothing unless this pref is set

b2g/chrome/content/shell.js

@@ -628,6 +628,27 @@ var shell = {
 
       Services.obs.notifyObservers(null, "browser-ui-startup-complete", "");
 
+#ifndef MOZ_WIDGET_GONK
+      let require = Cu.import("resource://gre/modules/devtools/Loader.jsm", {})
+                      .devtools.require;
+      let { TouchEventHandler } = require("devtools/touch-events");
+      let frame = content.QueryInterface(Ci.nsIInterfaceRequestor)
+                         .getInterface(Ci.nsIWebNavigation)
+                         .QueryInterface(Ci.nsIDocShell).chromeEventHandler;
+      let scope = {
+        addEventListener:
+          function(type, fun, capture) {
+            frame.addEventListener(type, fun, capture);
+          },
+        removeEventListener:
+          function(type, fun) {
+            frame.removeEventListener(type, fun);
+          }
+      };
+      let touchEventHandler = new TouchEventHandler(scope);
+      touchEventHandler.start();
+#endif
+
       if ('pendingChromeEvents' in shell) {
         shell.pendingChromeEvents.forEach((shell.sendChromeEvent).bind(shell));
       }

toolkit/devtools/touch-events.js

@@ -159,6 +159,18 @@ function TouchEventHandler (window) {
       return timeout;
     },
     sendTouchEvent: function teh_sendTouchEvent(evt, target, name) {
+      // When running OOP b2g desktop, we need to send the touch events
+      // using the mozbrowser api on the unwrapped frame.
+      if (target.localName == "iframe" && target.mozbrowser === true) {
+        let unwraped = XPCNativeWrapper.unwrap(target);
+        unwraped.sendTouchEvent(name, [0],                // event type, id
+                                [evt.pageX], [evt.pageY], // x, y
+                                [1], [1],                 // rx, ry
+                                [0], [0],                 // rotation, force
+                                1);                       // count
+        return;
+      }
+
       let document = target.ownerDocument;
       let content = this.getContent(target);