AppFwk: Introduce SelectionChangedReceiver as a slimmer replacement for NotificationCenter

Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/CMakeLists.txt

@@ -53,6 +53,8 @@ set( PROJECT_FILES
 
     cafSelectionManager.cpp
     cafSelectionManager.h
+    cafSelectionChangedReceiver.h
+    cafSelectionChangedReceiver.cpp
     cafSelectionManagerTools.h
 )
 

Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafSelectionChangedReceiver.cpp

@@ -0,0 +1,59 @@
+//##################################################################################################
+//
+//   Custom Visualization Core library
+//   Copyright (C) Ceetron Solutions AS
+//
+//   This library may be used under the terms of either the GNU General Public License or
+//   the GNU Lesser General Public License as follows:
+//
+//   GNU General Public License Usage
+//   This library is free software: you can redistribute it and/or modify
+//   it under the terms of the GNU General Public License as published by
+//   the Free Software Foundation, either version 3 of the License, or
+//   (at your option) any later version.
+//
+//   This library is distributed in the hope that it will be useful, but WITHOUT ANY
+//   WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//   FITNESS FOR A PARTICULAR PURPOSE.
+//
+//   See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
+//   for more details.
+//
+//   GNU Lesser General Public License Usage
+//   This library is free software; you can redistribute it and/or modify
+//   it under the terms of the GNU Lesser General Public License as published by
+//   the Free Software Foundation; either version 2.1 of the License, or
+//   (at your option) any later version.
+//
+//   This library is distributed in the hope that it will be useful, but WITHOUT ANY
+//   WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//   FITNESS FOR A PARTICULAR PURPOSE.
+//
+//   See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
+//   for more details.
+//
+//##################################################################################################
+
+#include "cafSelectionChangedReceiver.h"
+#include "cafSelectionManager.h"
+
+namespace caf
+{
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+caf::SelectionChangedReceiver::SelectionChangedReceiver()
+{
+    SelectionManager::instance()->registerSelectionChangedReceiver(this);
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+caf::SelectionChangedReceiver::~SelectionChangedReceiver()
+{
+    SelectionManager::instance()->unregisterSelectionChangedReceiver(this);
+}
+
+}

Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafSelectionChangedReceiver.h

@@ -0,0 +1,52 @@
+//##################################################################################################
+//
+//   Custom Visualization Core library
+//   Copyright (C) Ceetron Solutions AS
+//
+//   This library may be used under the terms of either the GNU General Public License or
+//   the GNU Lesser General Public License as follows:
+//
+//   GNU General Public License Usage
+//   This library is free software: you can redistribute it and/or modify
+//   it under the terms of the GNU General Public License as published by
+//   the Free Software Foundation, either version 3 of the License, or
+//   (at your option) any later version.
+//
+//   This library is distributed in the hope that it will be useful, but WITHOUT ANY
+//   WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//   FITNESS FOR A PARTICULAR PURPOSE.
+//
+//   See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
+//   for more details.
+//
+//   GNU Lesser General Public License Usage
+//   This library is free software; you can redistribute it and/or modify
+//   it under the terms of the GNU Lesser General Public License as published by
+//   the Free Software Foundation; either version 2.1 of the License, or
+//   (at your option) any later version.
+//
+//   This library is distributed in the hope that it will be useful, but WITHOUT ANY
+//   WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//   FITNESS FOR A PARTICULAR PURPOSE.
+//
+//   See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
+//   for more details.
+//
+//##################################################################################################
+#pragma once
+
+namespace caf
+{
+class SelectionChangedReceiver
+{
+public:
+    SelectionChangedReceiver();
+    virtual ~SelectionChangedReceiver();
+
+protected:
+    friend class SelectionManager;
+    /// Called whenever caf::SelectionManager's selection changes
+    virtual void onSelectionManagerSelectionChanged() = 0;
+};
+
+}

Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafSelectionManager.cpp

@@ -79,8 +79,7 @@ void SelectionManager::selectedItems(std::vector<PdmUiItem*>& items, int role /*
 void SelectionManager::setSelectedItems(const std::vector<PdmUiItem*>& items, int role /*= SelectionManager::APPLICATION_GLOBAL*/)
 {
     std::vector< std::pair<PdmPointer<PdmObjectHandle>, PdmUiItem*> >& selection = m_selectionForRole[role];
-
-    selection.clear();
+    std::vector< std::pair<PdmPointer<PdmObjectHandle>, PdmUiItem*> > newSelection;
 
     for (size_t i = 0; i < items.size(); i++)
     {
@@ -89,19 +88,23 @@ void SelectionManager::setSelectedItems(const std::vector<PdmUiItem*>& items, in
         {
             PdmObjectHandle* obj = fieldHandle->fieldHandle()->ownerObject();
 
-            selection.push_back(std::make_pair(obj, fieldHandle));
+            newSelection.push_back(std::make_pair(obj, fieldHandle));
         }
         else
         {
             PdmUiObjectHandle* obj = dynamic_cast<PdmUiObjectHandle*>(items[i]);
             if (obj)
             {
-                selection.push_back(std::make_pair(obj->objectHandle(), obj));
+                newSelection.push_back(std::make_pair(obj->objectHandle(), obj));
             }
         }
     }
 
-    notifySelectionChanged();
+    if (newSelection != selection)
+    {
+        selection = newSelection;
+        notifySelectionChanged();
+    }
 }
 
 //--------------------------------------------------------------------------------------------------
@@ -197,12 +200,17 @@ void SelectionManager::setSelectionFromReferences(const std::vector<QString>& re
 //--------------------------------------------------------------------------------------------------
 void SelectionManager::clearAll()
 {
+    bool isChanged = false;
     for (size_t i = 0; i < m_selectionForRole.size(); i++)
     {
-        m_selectionForRole[i].clear();
+        if ( m_selectionForRole[i].size())
+        {
+            m_selectionForRole[i].clear();
+            isChanged = true;
+        }
     }
 
-    notifySelectionChanged();
+    if (isChanged) notifySelectionChanged();
 }
 
 
@@ -211,9 +219,12 @@ void SelectionManager::clearAll()
 //--------------------------------------------------------------------------------------------------
 void SelectionManager::clear(int role)
 {
-    m_selectionForRole[role].clear();
+    if ( m_selectionForRole[role].size() )
+    {
+        m_selectionForRole[role].clear();
 
-    notifySelectionChanged();
+        notifySelectionChanged();
+    }
 }
 
 //--------------------------------------------------------------------------------------------------
@@ -225,6 +236,11 @@ void SelectionManager::notifySelectionChanged()
     {
         m_notificationCenter->notifyObserversOfSelectionChange();
     }
+
+    for (auto receiver: m_selectionReceivers)
+    {
+        receiver->onSelectionManagerSelectionChanged();
+    }
 }
 
 //--------------------------------------------------------------------------------------------------

Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafSelectionManager.h

@@ -33,18 +33,16 @@
 //   for more details.
 //
 //##################################################################################################
-
-
 #pragma once
 
-#include "cafPdmPointer.h"
+#include "cafSelectionChangedReceiver.h"
 
+#include "cafPdmPointer.h"
 #include "cafPdmField.h"
 
-#include <vector>
-
 #include <QString>
-
+#include <vector>
+#include <set>
 
 namespace caf 
 {
@@ -102,6 +100,8 @@ public:
             if (obj) typedObjects->push_back(obj);
         }
     }
+    
+    /// Returns the selected objects of the requested type if _all_ the selected objects are of the requested type
 
     template <typename T>
     void objectsByTypeStrict(std::vector<T*>* typedObjects, int role = SelectionManager::APPLICATION_GLOBAL)
@@ -124,12 +124,18 @@ private:
     SelectionManager();
     void notifySelectionChanged();
 
+    friend class SelectionChangedReceiver;
+    void registerSelectionChangedReceiver  ( SelectionChangedReceiver* receiver) { m_selectionReceivers.insert(receiver);}
+    void unregisterSelectionChangedReceiver( SelectionChangedReceiver* receiver) { m_selectionReceivers.erase(receiver);}
+
 private:
     std::vector < std::vector< std::pair<PdmPointer<PdmObjectHandle>, PdmUiItem*> > > m_selectionForRole;
 
     NotificationCenter*         m_notificationCenter;
     PdmChildArrayFieldHandle*   m_activeChildArrayFieldHandle;
     PdmPointer<PdmObjectHandle> m_rootObject;
+
+    std::set< SelectionChangedReceiver*> m_selectionReceivers;
 };