Fix particle emitting duration.

Add event for ending particles emitting.
Add event for all particles over.

Source/Urho3D/Urho2D/ParticleEmitter2D.cpp

@@ -262,11 +262,21 @@ void ParticleEmitter2D::UpdateMaterial()
         sourceBatches_[0].material_ = 0;
 }
 
+URHO3D_EVENT(E_PARTICLESEND, ParticlesEnd) {
+}
+URHO3D_EVENT(E_PARTICLESDURATION, ParticlesDuration) {
+}
+
 void ParticleEmitter2D::HandleScenePostUpdate(StringHash eventType, VariantMap& eventData)
 {
     using namespace ScenePostUpdate;
-    float timeStep = eventData[P_TIMESTEP].GetFloat();
+	unsigned tests = (numParticles_ > 0 ? 1 : 0) | (emissionTime_ > 0.0f ? 2 : 0);
+	float timeStep = eventData[P_TIMESTEP].GetFloat();
     Update(timeStep);
+	if ((tests & 2) && emissionTime_ == 0.0f)
+		SendEvent(E_PARTICLESDURATION);	// emitting particles stoped
+	if ((tests & 1) && !numParticles_)
+		SendEvent(E_PARTICLESEND);		// all particles over
 }
 
 void ParticleEmitter2D::Update(float timeStep)
@@ -297,7 +307,7 @@ void ParticleEmitter2D::Update(float timeStep)
         }
     }
 
-    if (emissionTime_ >= 0.0f)
+    if (emissionTime_ > 0.0f)
     {
         float worldAngle = GetNode()->GetWorldRotation().RollAngle();