Camera Component, Editor Viewport Widget refactoring.

- Handle changing of active camera entirely inside CameraComponentController
- Remove a LOT of legacy Cry things related to cameras
- Add a CameraSystemComponent to handle ActiveCameraRequestBus and CameraSystemRequestBus

Signed-off-by: Yuriy Toporovskyy <toporovskyy.y@gmail.com>

Gems/Camera/Code/Source/CameraComponentController.cpp

@@ -24,7 +24,7 @@ namespace Camera
         if (auto serializeContext = azrtti_cast<AZ::SerializeContext*>(context))
         {
             serializeContext->Class<CameraComponentConfig, AZ::ComponentConfig>()
-                ->Version(3)
+                ->Version(4)
                 ->Field("Orthographic", &CameraComponentConfig::m_orthographic)
                 ->Field("Orthographic Half Width", &CameraComponentConfig::m_orthographicHalfWidth)
                 ->Field("Field of View", &CameraComponentConfig::m_fov)
@@ -51,6 +51,7 @@ namespace Camera
                         ->Attribute(AZ::Edit::Attributes::Visibility, &CameraComponentConfig::GetOrthographicParameterVisibility)
                         ->Attribute(AZ::Edit::Attributes::Min, 0.001f)
                         ->Attribute(AZ::Edit::Attributes::ChangeNotify, AZ::Edit::PropertyRefreshLevels::ValuesOnly)
+
                     ->DataElement(AZ::Edit::UIHandlers::Default, &CameraComponentConfig::m_fov, "Field of view", "Vertical field of view in degrees")
                         ->Attribute(AZ::Edit::Attributes::Min, MIN_FOV)
                         ->Attribute(AZ::Edit::Attributes::Suffix, " degrees")
@@ -130,6 +131,11 @@ namespace Camera
 
     void CameraComponentController::DeactivateAtomView()
     {
+        if (!IsActiveView())
+        {
+            return;
+        }
+
         auto atomViewportRequests = AZ::Interface<AZ::RPI::ViewportContextRequestsInterface>::Get();
         if (atomViewportRequests)
         {
@@ -413,6 +419,11 @@ namespace Camera
 
     void CameraComponentController::MakeActiveView()
     {
+        if (IsActiveView())
+        {
+            return;
+        }
+
         // Set Legacy Cry view, if it exists
         if (m_viewSystem)
         {
@@ -433,6 +444,11 @@ namespace Camera
         CameraNotificationBus::Broadcast(&CameraNotificationBus::Events::OnActiveViewChanged, m_entityId);
     }
 
+    bool CameraComponentController::IsActiveView()
+    {
+        return AZ::RPI::ViewportContextNotificationBus::Handler::BusIsConnected();
+    }
+
     void CameraComponentController::OnTransformChanged([[maybe_unused]] const AZ::Transform& local, const AZ::Transform& world)
     {
         if (m_updatingTransformFromEntity)
@@ -459,6 +475,17 @@ namespace Camera
         UpdateCamera();
     }
 
+    void CameraComponentController::OnViewportDefaultViewChanged(AZ::RPI::ViewPtr view)
+    {
+        if (m_atomCamera != view)
+        {
+            // Note that when disconnected from this bus, this signals that we are not the active view
+            // There is nothing else to do here: leave our view on the viewport context stack, don't need
+            // to update properties. The viewport context system should handle it all!
+            AZ::RPI::ViewportContextNotificationBus::Handler::BusDisconnect();
+        }
+    }
+
     AZ::RPI::ViewPtr CameraComponentController::GetView() const
     {
         return m_atomCamera;