Notify plugins if a composer has been added or removed

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@12372 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

python/gui/qgisinterface.sip

@@ -246,5 +246,13 @@ class QgisInterface : QObject
      */
     void currentLayerChanged ( QgsMapLayer * layer );
 
+    /**This signal is emitted when a new composer instance has been created
+       @note added in version 1.4*/
+    void composerAdded( QgsComposerView* v );
+
+    /**This signal is emitted before a new composer instance is going to be removed
+       @note added in version 1.4*/
+    void composerWillBeRemoved( QgsComposerView* v );
+
 };
 

src/app/qgisapp.cpp

@@ -3633,11 +3633,13 @@ QgsComposer* QgisApp::createNewComposer()
   //and place action into print composers menu
   mPrintComposersMenu->addAction( newComposerObject->windowAction() );
   newComposerObject->open();
+  emit composerAdded(newComposerObject->view());
   return newComposerObject;
 }
 
 void QgisApp::deleteComposer( QgsComposer* c )
 {
+  emit composerWillBeRemoved(c->view());
   mPrintComposers.remove( c );
   mPrintComposersMenu->removeAction( c->windowAction() );
   delete c;

src/app/qgisapp.h

@@ -41,6 +41,7 @@ class QValidator;
 class QgisAppInterface;
 class QgsClipboard;
 class QgsComposer;
+class QgsComposerView;
 class QgsGeometry;
 class QgsHelpViewer;
 class QgsFeature;
@@ -669,6 +670,15 @@ class QgisApp : public QMainWindow
      */
     void currentThemeChanged( QString );
 
+    /**This signal is emitted when a new composer instance has been created
+       @note added in version 1.4*/
+    void composerAdded( QgsComposerView* v );
+
+     /**This signal is emitted before a new composer instance is going to be removed
+       @note added in version 1.4*/
+    void composerWillBeRemoved( QgsComposerView* v );
+
+
   private:
     /** This method will open a dialog so the user can select the sublayers
     * to load

src/app/qgisappinterface.cpp

@@ -39,7 +39,8 @@ QgisAppInterface::QgisAppInterface( QgisApp * _qgis )
            this, SIGNAL( currentLayerChanged( QgsMapLayer * ) ) );
   connect( qgis, SIGNAL( currentThemeChanged( QString ) ),
            this, SIGNAL( currentThemeChanged( QString ) ) );
-
+  connect( qgis, SIGNAL(composerAdded(QgsComposerView*)), this, SIGNAL(composerAdded( QgsComposerView* )));
+  connect( qgis, SIGNAL(composerWillBeRemoved(QgsComposerView*)), this, SIGNAL(composerWillBeRemoved(QgsComposerView*)));
 }
 
 QgisAppInterface::~QgisAppInterface()
@@ -211,7 +212,6 @@ bool QgisAppInterface::unregisterMainWindowAction( QAction* action )
   return QgsShortcutsManager::instance()->unregisterAction( action );
 }
 
-
 //! Menus
 QMenu *QgisAppInterface::fileMenu() { return qgis->fileMenu(); }
 QMenu *QgisAppInterface::editMenu() { return qgis->editMenu(); }

src/gui/qgisinterface.h

@@ -292,7 +292,12 @@ class GUI_EXPORT QgisInterface : public QObject
      *  The pointer to layer can be null if no layer is selected
      */
     void currentLayerChanged( QgsMapLayer * layer );
-
+    /**This signal is emitted when a new composer instance has been created
+       @note added in version 1.4*/
+    void composerAdded( QgsComposerView* v );
+    /**This signal is emitted before a new composer instance is going to be removed
+       @note added in version 1.4*/
+    void composerWillBeRemoved( QgsComposerView* v );
 };
 
 // FIXME: also in core/qgis.h