Bug 910978 part.9 Implement widget::WheelEvent::AssignWheelEventData() r=smaug

content/events/src/nsDOMEvent.cpp

@@ -606,24 +606,7 @@ nsDOMEvent::DuplicatePrivateData()
         static_cast<widget::WheelEvent*>(mEvent);
       widget::WheelEvent* wheelEvent =
         new widget::WheelEvent(false, msg, nullptr);
-      wheelEvent->AssignInputEventData(*oldWheelEvent, true);
-      wheelEvent->deltaX = oldWheelEvent->deltaX;
-      wheelEvent->deltaY = oldWheelEvent->deltaY;
-      wheelEvent->deltaZ = oldWheelEvent->deltaZ;
-      wheelEvent->deltaMode = oldWheelEvent->deltaMode;
-      wheelEvent->relatedTarget = oldWheelEvent->relatedTarget;
-      wheelEvent->button = oldWheelEvent->button;
-      wheelEvent->buttons = oldWheelEvent->buttons;
-      wheelEvent->modifiers = oldWheelEvent->modifiers;
-      wheelEvent->inputSource = oldWheelEvent->inputSource;
-      wheelEvent->customizedByUserPrefs = oldWheelEvent->customizedByUserPrefs;
-      wheelEvent->isMomentum = oldWheelEvent->isMomentum;
-      wheelEvent->isPixelOnlyDevice = oldWheelEvent->isPixelOnlyDevice;
-      wheelEvent->lineOrPageDeltaX = oldWheelEvent->lineOrPageDeltaX;
-      wheelEvent->lineOrPageDeltaY = oldWheelEvent->lineOrPageDeltaY;
-      wheelEvent->scrollType = oldWheelEvent->scrollType;
-      wheelEvent->overflowDeltaX = oldWheelEvent->overflowDeltaX;
-      wheelEvent->overflowDeltaY = oldWheelEvent->overflowDeltaY;
+      wheelEvent->AssignWheelEventData(*oldWheelEvent, true);
       newEvent = wheelEvent;
       break;
     }

widget/nsGUIEvent.h

@@ -1541,6 +1541,24 @@ public:
   //       it would need to check the deltaX and deltaY.
   double overflowDeltaX;
   double overflowDeltaY;
+
+  void AssignWheelEventData(const WheelEvent& aEvent, bool aCopyTargets)
+  {
+    AssignMouseEventBaseData(aEvent, aCopyTargets);
+
+    deltaX = aEvent.deltaX;
+    deltaY = aEvent.deltaY;
+    deltaZ = aEvent.deltaZ;
+    deltaMode = aEvent.deltaMode;
+    customizedByUserPrefs = aEvent.customizedByUserPrefs;
+    isMomentum = aEvent.isMomentum;
+    isPixelOnlyDevice = aEvent.isPixelOnlyDevice;
+    lineOrPageDeltaX = aEvent.lineOrPageDeltaX;
+    lineOrPageDeltaY = aEvent.lineOrPageDeltaY;
+    scrollType = aEvent.scrollType;
+    overflowDeltaX = aEvent.overflowDeltaX;
+    overflowDeltaY = aEvent.overflowDeltaY;
+  }
 };
 
 } // namespace widget

widget/tests/test_assign_event_data.html

@@ -312,6 +312,43 @@ const kTests = [
     },
     todoMismatch: [ ],
   },
+  { description: "widget::WheelEvent (wheel, vertical)",
+    targetID: "input-text", eventType: "wheel",
+    dispatchEvent: function () {
+      document.getElementById(this.targetID).value = "";
+      synthesizeWheel(document.getElementById(this.targetID), 3, 4,
+                      { deltaY: 20, lineOrPageDeltaY: 1, altKey: true });
+    },
+    canRun: function () {
+      return true;
+    },
+    todoMismatch: [ ],
+  },
+  { description: "widget::WheelEvent (wheel, horizontal)",
+    targetID: "input-text", eventType: "wheel",
+    dispatchEvent: function () {
+      document.getElementById(this.targetID).value = "";
+      synthesizeWheel(document.getElementById(this.targetID), 4, 5,
+                      { deltaX: 20, lineOrPageDeltaX: 1, ctrlKey: true });
+    },
+    canRun: function () {
+      return true;
+    },
+    todoMismatch: [ ],
+  },
+  { description: "widget::WheelEvent (wheel, both)",
+    targetID: "input-text", eventType: "wheel",
+    dispatchEvent: function () {
+      document.getElementById(this.targetID).value = "";
+      synthesizeWheel(document.getElementById(this.targetID), 4, 5,
+                      { deltaX: 20, deltaY: 10,
+                        lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 });
+    },
+    canRun: function () {
+      return true;
+    },
+    todoMismatch: [ ],
+  },
 ];
 
 function doTest(aTest)