[all] Fixed AnimationState#addEmptyAnimation when the track is empty.

http://esotericsoftware.com/forum/Spine-4-change-in-behavior-with-EmptyAnimation-16176

spine-as3/spine-as3/src/spine/animation/AnimationState.as

@@ -549,10 +549,10 @@ package spine.animation {
 		}
 
 		public function addEmptyAnimation(trackIndex : int, mixDuration : Number, delay : Number) : TrackEntry {
-			var entry : TrackEntry = addAnimation(trackIndex, emptyAnimation, false, delay <= 0 ? 1 : delay);
+			var entry : TrackEntry = addAnimation(trackIndex, emptyAnimation, false, delay);
+			if (delay <= 0) entry.delay += entry.mixDuration - mixDuration;
 			entry.mixDuration = mixDuration;
 			entry.trackEnd = mixDuration;
-			if (delay <= 0 && entry.previous != null) entry.delay = entry.previous.getTrackComplete() - entry.mixDuration + delay;
 			return entry;
 		}
 

spine-c/spine-c/src/spine/AnimationState.c

@@ -868,12 +868,10 @@ spTrackEntry *spAnimationState_setEmptyAnimation(spAnimationState *self, int tra
 
 spTrackEntry *
 spAnimationState_addEmptyAnimation(spAnimationState *self, int trackIndex, float mixDuration, float delay) {
-	spTrackEntry *entry;
-	entry = spAnimationState_addAnimation(self, trackIndex, SP_EMPTY_ANIMATION, 0, delay <= 0 ? 1 : delay);
+	spTrackEntry *entry = spAnimationState_addAnimation(self, trackIndex, SP_EMPTY_ANIMATION, 0, delay);
+	if (delay <= 0) entry->delay += entry->mixDuration - mixDuration;
 	entry->mixDuration = mixDuration;
 	entry->trackEnd = mixDuration;
-	if (delay <= 0 && entry->previous != NULL)
-		entry->delay = spTrackEntry_getTrackComplete(entry->previous) - entry->mixDuration + delay;
 	return entry;
 }
 

spine-cpp/spine-cpp/src/spine/AnimationState.cpp

@@ -606,11 +606,10 @@ TrackEntry *AnimationState::setEmptyAnimation(size_t trackIndex, float mixDurati
 }
 
 TrackEntry *AnimationState::addEmptyAnimation(size_t trackIndex, float mixDuration, float delay) {
-	TrackEntry *entry = addAnimation(trackIndex, AnimationState::getEmptyAnimation(), false, delay <= 0 ? 1 : delay);
+	TrackEntry *entry = addAnimation(trackIndex, AnimationState::getEmptyAnimation(), false, delay);
+	if (delay <= 0) entry->_delay += entry->_mixDuration - mixDuration;
 	entry->_mixDuration = mixDuration;
 	entry->_trackEnd = mixDuration;
-	if (delay <= 0 && entry->_previous != NULL)
-		entry->_delay = entry->_previous->getTrackComplete() - entry->_mixDuration + delay;
 	return entry;
 }
 

spine-csharp/src/AnimationState.cs

@@ -769,10 +769,10 @@ namespace Spine {
 		/// after the <see cref="AnimationState.Dispose"/> event occurs.
 		/// </returns>
 		public TrackEntry AddEmptyAnimation (int trackIndex, float mixDuration, float delay) {
-			TrackEntry entry = AddAnimation(trackIndex, AnimationState.EmptyAnimation, false, delay <= 0 ? 1 : delay);
+			TrackEntry entry = AddAnimation(trackIndex, AnimationState.EmptyAnimation, false, delay);
+			if (delay <= 0) entry.delay += entry.mixDuration - mixDuration;
 			entry.mixDuration = mixDuration;
 			entry.trackEnd = mixDuration;
-			if (delay <= 0 && entry.previous != null) entry.delay = entry.previous.TrackComplete - entry.mixDuration + delay;
 			return entry;
 		}
 

spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/AnimationState.java

@@ -666,10 +666,10 @@ public class AnimationState {
 	 * @return A track entry to allow further customization of animation playback. References to the track entry must not be kept
 	 *         after the {@link AnimationStateListener#dispose(TrackEntry)} event occurs. */
 	public TrackEntry addEmptyAnimation (int trackIndex, float mixDuration, float delay) {
-		TrackEntry entry = addAnimation(trackIndex, emptyAnimation, false, delay <= 0 ? 1 : delay);
+		TrackEntry entry = addAnimation(trackIndex, emptyAnimation, false, delay);
+		if (delay <= 0) entry.delay += entry.mixDuration - mixDuration;
 		entry.mixDuration = mixDuration;
 		entry.trackEnd = mixDuration;
-		if (delay <= 0 && entry.previous != null) entry.delay = entry.previous.getTrackComplete() - entry.mixDuration + delay;
 		return entry;
 	}
 

spine-lua/spine-lua/AnimationState.lua

@@ -789,14 +789,12 @@ function AnimationState:setEmptyAnimation (trackIndex, mixDuration)
 end
 
 function AnimationState:addEmptyAnimation (trackIndex, mixDuration, delay)
-	local addDelay = 1
-	if delay > 0 then addDelay = delay end
-	local entry = self:addAnimation(trackIndex, EMPTY_ANIMATION, false, addDelay)
+	local entry = self:addAnimation(trackIndex, EMPTY_ANIMATION, false, delay)
+	if delay <= 0 then
+		entry.delay = entry.delay + entry.mixDuration - mixDuration
+	end
 	entry.mixDuration = mixDuration
 	entry.trackEnd = mixDuration
-	if delay <= 0 and entry.previous then
-		entry.delay = entry.previous:getTrackComplete() - entry.mixDuration + delay
-	end
 	return entry
 end
 

spine-ts/core/src/AnimationState.ts

@@ -609,10 +609,10 @@ module spine {
 		 * @return A track entry to allow further customization of animation playback. References to the track entry must not be kept
 		 *         after the {@link AnimationStateListener#dispose()} event occurs. */
 		addEmptyAnimation (trackIndex: number, mixDuration: number = 0, delay: number = 0) {
-			let entry = this.addAnimationWith(trackIndex, AnimationState.emptyAnimation(), false, delay <= 0 ? 1 : delay);
+			let entry = this.addAnimationWith(trackIndex, AnimationState.emptyAnimation(), false, delay);
+			if (delay <= 0) entry.delay += entry.mixDuration - mixDuration;
 			entry.mixDuration = mixDuration;
 			entry.trackEnd = mixDuration;
-			if (delay <= 0 && entry.previous) entry.delay = entry.previous.getTrackComplete() - entry.mixDuration + delay;
 			return entry;
 		}