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

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

6 files changed, 17 insertions, 10 deletions

diff --git a/dom/animation/AnimationEffectReadOnly.cpp b/dom/animation/AnimationEffectReadOnly.cpp
index aff28a37bf..bf2e2197d9 100644
--- a/dom/animation/AnimationEffectReadOnly.cpp
+++ b/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
diff --git a/dom/animation/ComputedTiming.h b/dom/animation/ComputedTiming.h
index 4a98e39337..addf158659 100644
--- a/dom/animation/ComputedTiming.h
+++ b/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.
diff --git a/dom/base/nsGkAtomList.h b/dom/base/nsGkAtomList.h
index e4ae7ede81..09d73e6175 100644
--- a/dom/base/nsGkAtomList.h
+++ b/dom/base/nsGkAtomList.h
@@ -941,6 +941,7 @@ 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")
diff --git a/dom/events/EventNameList.h b/dom/events/EventNameList.h
index ba2427623e..61942b251f 100644
--- a/dom/events/EventNameList.h
+++ b/dom/events/EventNameList.h
@@ -1003,6 +1003,10 @@ EVENT(transitionend,
       eTransitionEnd,
       EventNameType_All,
       eTransitionEventClass)
+EVENT(transitioncancel,
+      eTransitionCancel,
+      EventNameType_All,
+      eTransitionEventClass)
 EVENT(animationstart,
       eAnimationStart,
       EventNameType_All,
diff --git a/dom/webidl/EventHandler.webidl b/dom/webidl/EventHandler.webidl
index e65a757873..c76dfe211f 100644
--- a/dom/webidl/EventHandler.webidl
+++ b/dom/webidl/EventHandler.webidl
@@ -131,6 +131,7 @@ 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)
diff --git a/widget/EventMessageList.h b/widget/EventMessageList.h
index 7fe642637e..474e25862f 100644
--- a/widget/EventMessageList.h
+++ b/widget/EventMessageList.h
@@ -340,6 +340,7 @@ 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)