Bug 1264125: Fire transitioncancel event when a transition is canceled - part 1 (in the description)

Issue #55
part 1 - Add transitioncancel event handler
part 2 - Add ontransitioncancel EventHandler to WebIDL
part 3 - Add member of active time to ComputedTiming

dom/animation/AnimationEffectReadOnly.cpp

@@ -127,10 +127,6 @@ AnimationEffectReadOnly::GetComputedTimingAt(
   }
   const TimeDuration& localTime = aLocalTime.Value();
 
-  // Calculate the time within the active interval.
-  // https://w3c.github.io/web-animations/#active-time
-  StickyTimeDuration activeTime;
-
   StickyTimeDuration beforeActiveBoundary =
     std::max(std::min(StickyTimeDuration(aTiming.mDelay), result.mEndTime),
              zeroDuration);
@@ -148,7 +144,7 @@ AnimationEffectReadOnly::GetComputedTimingAt(
       // The animation isn't active or filling at this time.
       return result;
     }
-    activeTime =
+    result.mActiveTime =
       std::max(std::min(StickyTimeDuration(localTime - aTiming.mDelay),
                         result.mActiveDuration),
                zeroDuration);
@@ -159,13 +155,14 @@ AnimationEffectReadOnly::GetComputedTimingAt(
       // The animation isn't active or filling at this time.
       return result;
     }
-    activeTime = std::max(StickyTimeDuration(localTime - aTiming.mDelay),
-                          zeroDuration);
+    result.mActiveTime
+      = std::max(StickyTimeDuration(localTime - aTiming.mDelay),
+                 zeroDuration);
   } else {
     MOZ_ASSERT(result.mActiveDuration != zeroDuration,
                "How can we be in the middle of a zero-duration interval?");
     result.mPhase = ComputedTiming::AnimationPhase::Active;
-    activeTime = localTime - aTiming.mDelay;
+    result.mActiveTime = localTime - aTiming.mDelay;
   }
 
   // Convert active time to a multiple of iterations.
@@ -176,7 +173,7 @@ AnimationEffectReadOnly::GetComputedTimingAt(
                       ? 0.0
                       : result.mIterations;
   } else {
-    overallProgress = activeTime / result.mDuration;
+    overallProgress = result.mActiveTime / result.mDuration;
   }
 
   // Factor in iteration start offset.
@@ -208,7 +205,8 @@ AnimationEffectReadOnly::GetComputedTimingAt(
   if (result.mPhase == ComputedTiming::AnimationPhase::After &&
       progress == 0.0 &&
       result.mIterations != 0.0 &&
-      (activeTime != zeroDuration || result.mDuration == zeroDuration)) {
+      (result.mActiveTime != zeroDuration ||
+       result.mDuration == zeroDuration)) {
     // The only way we can be in the after phase with a progress of zero and
     // a current iteration of zero, is if we have a zero iteration count or
     // were clipped using a negative end delay--both of which we should have

dom/animation/ComputedTiming.h

@@ -29,6 +29,8 @@ struct ComputedTiming
   // Will equal StickyTimeDuration::Forever() if the animation repeats
   // indefinitely.
   StickyTimeDuration  mActiveDuration;
+  // The time within the active interval.
+  StickyTimeDuration mActiveTime;
   // The effect end time in local time (i.e. an offset from the effect's
   // start time). Will equal StickyTimeDuration::Forever() if the animation
   // plays indefinitely.

dom/base/nsGkAtomList.h

@@ -942,6 +942,7 @@ GK_ATOM(ontouchstart, "ontouchstart")
 GK_ATOM(ontouchend, "ontouchend")
 GK_ATOM(ontouchmove, "ontouchmove")
 GK_ATOM(ontouchcancel, "ontouchcancel")
+GK_ATOM(ontransitioncancel, "ontransitioncancel")
 GK_ATOM(ontransitionend, "ontransitionend")
 GK_ATOM(ontransitionrun, "ontransitionrun")
 GK_ATOM(ontransitionstart, "ontransitionstart")

dom/events/EventNameList.h

@@ -1007,6 +1007,10 @@ EVENT(transitionend,
       eTransitionEnd,
       EventNameType_All,
       eTransitionEventClass)
+EVENT(transitioncancel,
+      eTransitionCancel,
+      EventNameType_All,
+      eTransitionEventClass)
 EVENT(animationstart,
       eAnimationStart,
       EventNameType_All,

dom/webidl/EventHandler.webidl

@@ -132,6 +132,7 @@ interface GlobalEventHandlers {
            attribute EventHandler onanimationend;
            attribute EventHandler onanimationiteration;
            attribute EventHandler onanimationstart;
+           attribute EventHandler ontransitioncancel;
            attribute EventHandler ontransitionend;
            // We will ship transitionrun and transitionstart events
            // on Firefox 53. (For detail, see bug 1324985)

widget/EventMessageList.h

@@ -341,6 +341,7 @@ NS_EVENT_MESSAGE(eScrolledAreaChanged)
 NS_EVENT_MESSAGE(eTransitionStart)
 NS_EVENT_MESSAGE(eTransitionRun)
 NS_EVENT_MESSAGE(eTransitionEnd)
+NS_EVENT_MESSAGE(eTransitionCancel)
 NS_EVENT_MESSAGE(eAnimationStart)
 NS_EVENT_MESSAGE(eAnimationEnd)
 NS_EVENT_MESSAGE(eAnimationIteration)