[FEATURE] legend interface added to retrieve layers in legend order (…

…supplied by Maxim Dubinin)

git-svn-id: http://svn.osgeo.org/qgis/trunk@13264 c8812cc2-4d05-0410-92ff-de0c093fc19c

python/gui/qgslegendinterface.sip

@@ -16,8 +16,13 @@ class QgsLegendInterface : QObject
     /** Virtual destructor */
     ~QgsLegendInterface();
 
+    //! Return a string list of groups
     virtual QStringList groups() =0;
 
+    //! Return all layers in the project in legend order
+    //! @note added in 1.5
+    virtual QList< QgsMapLayer * > layers() const = 0;
+
   signals:
 
     //! emitted when a group index has changed

src/app/legend/qgsapplegendinterface.cpp

@@ -18,6 +18,7 @@
 #include "qgsapplegendinterface.h"
 
 #include "qgslegend.h"
+#include "qgslegendlayer.h"
 #include "qgsmaplayer.h"
 
 QgsAppLegendInterface::QgsAppLegendInterface( QgsLegend * legend )
@@ -58,6 +59,22 @@ QStringList QgsAppLegendInterface::groups()
   return mLegend->groups();
 }
 
+QList< QgsMapLayer * > QgsAppLegendInterface::layers() const
+{
+  QList< QgsMapLayer * > items;
+  QTreeWidgetItemIterator it( mLegend );
+  while ( *it )
+  {
+    QgsLegendLayer *llayer = dynamic_cast<QgsLegendLayer *>( *it );
+    if ( llayer )
+      items.append( llayer->layer() );
+
+    ++it;
+  }
+
+  return items;
+}
+
 void QgsAppLegendInterface::refreshLayerSymbology( QgsMapLayer *ml )
 {
   mLegend->refreshLayerSymbology( ml->getLayerID() );

src/app/legend/qgsapplegendinterface.h

@@ -44,6 +44,9 @@ class QgsAppLegendInterface : public QgsLegendInterface
     //! Return a string list of groups
     QStringList groups();
 
+    //! Return all layers in the project in legend order
+    QList< QgsMapLayer * > layers() const;
+
   public slots:
 
     //! Add a new group

src/gui/qgslegendinterface.h

@@ -44,6 +44,10 @@ class GUI_EXPORT QgsLegendInterface : public QObject
     //! Return a string list of groups
     virtual QStringList groups() = 0;
 
+    //! Return all layers in the project in legend order
+    //! @note added in 1.5
+    virtual QList< QgsMapLayer * > layers() const = 0;
+
   signals:
 
     //! emitted when a group index has changed