Utility/Node: Added listeners

Former-commit-id: aeddcbc5c61b7b51333ed704065fe6a18f17b2dc

src/Nazara/Utility/Node.cpp

@@ -49,6 +49,16 @@ NzNode::~NzNode()
 	}
 
 	SetParent(nullptr);
+
+	m_listenersLocked = true;
+	for (auto& pair : m_listeners)
+		pair.first->OnNodeReleased(this, pair.second);
+}
+
+void NzNode::AddListener(Listener* listener, void* userdata) const
+{
+	if (!m_listenersLocked)
+		m_listeners.insert(std::make_pair(listener, userdata));
 }
 
 void NzNode::EnsureDerivedUpdate() const
@@ -283,6 +293,12 @@ NzNode& NzNode::Move(float moveX, float moveY, float moveZ, nzCoordSys coordSys)
 	return Move(NzVector3f(moveX, moveY, moveZ), coordSys);
 }
 
+void NzNode::RemoveListener(Listener* listener) const
+{
+	if (!m_listenersLocked)
+		m_listeners.erase(listener);
+}
+
 NzNode& NzNode::Rotate(const NzQuaternionf& rotation, nzCoordSys coordSys)
 {
 	// Évitons toute mauvaise surprise ..
@@ -645,11 +661,13 @@ void NzNode::InvalidateNode()
 
 	for (NzNode* node : m_childs)
 		node->InvalidateNode();
+
+	NotifyInvalidation();
 }
 
 void NzNode::OnParenting(const NzNode* parent)
 {
-	NazaraUnused(parent);
+	NotifyParented(parent);
 }
 
 void NzNode::RemoveChild(NzNode* node) const
@@ -703,3 +721,60 @@ void NzNode::UpdateTransformMatrix() const
 	m_transformMatrix.MakeTransform(m_derivedPosition, m_derivedRotation, m_derivedScale);
 	m_transformMatrixUpdated = true;
 }
+
+void NzNode::NotifyInvalidation()
+{
+	m_listenersLocked = true;
+
+	auto it = m_listeners.begin();
+	while (it != m_listeners.end())
+	{
+		if (!it->first->OnNodeInvalidated(this, it->second))
+			m_listeners.erase(it++);
+		else
+			++it;
+	}
+
+	m_listenersLocked = false;
+}
+
+void NzNode::NotifyParented(const NzNode* parent)
+{
+	m_listenersLocked = true;
+
+	auto it = m_listeners.begin();
+	while (it != m_listeners.end())
+	{
+		if (!it->first->OnNodeParented(this, parent, it->second))
+			m_listeners.erase(it++);
+		else
+			++it;
+	}
+
+	m_listenersLocked = false;
+}
+
+NzNode::Listener::~Listener() = default;
+
+bool NzNode::Listener::OnNodeInvalidated(const NzNode* node, void* userdata)
+{
+	NazaraUnused(node);
+	NazaraUnused(userdata);
+
+	return true;
+}
+
+bool NzNode::Listener::OnNodeParented(const NzNode* node, const NzNode* parent, void* userdata)
+{
+	NazaraUnused(node);
+	NazaraUnused(parent);
+	NazaraUnused(userdata);
+
+	return true;
+}
+
+void NzNode::Listener::OnNodeReleased(const NzNode* node, void* userdata)
+{
+	NazaraUnused(node);
+	NazaraUnused(userdata);
+}