[gparted] Store pointers to partition objects in DrawingAreaVisualDisk (#750168)

[Curtis Gedak <gedakc src gnome org>]

commit cc1448abd237291e1775aa88b67faa47890a5450
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sun May 17 10:06:38 2015 +0100

    Store pointers to partition objects in DrawingAreaVisualDisk (#750168)
    
    This stops copying of each displayed partition object into the
    DrawingAreaVisualDisk class.
    
    Bug 750168 - Reduce the amount of copying of partition objects

 include/DrawingAreaVisualDisk.h |    6 +++---
 src/DrawingAreaVisualDisk.cc    |   14 +++++++-------
 2 files changed, 10 insertions(+), 10 deletions(-)
---
diff --git a/include/DrawingAreaVisualDisk.h b/include/DrawingAreaVisualDisk.h
index d7c7ca2..ccd1a15 100644
--- a/include/DrawingAreaVisualDisk.h
+++ b/include/DrawingAreaVisualDisk.h
@@ -83,9 +83,9 @@ private:
                Gdk::Color color ;
                Glib::RefPtr<Pango::Layout> pango_layout;
 
-               //real partition
-               Partition partition ;
-               
+               // Pointer to real partition.  (Alias to element in Win_GParted::display_partitions[] vector).
+               const Partition * partition_ptr;
+
                std::vector<visual_partition> logicals ;
 
                visual_partition()
diff --git a/src/DrawingAreaVisualDisk.cc b/src/DrawingAreaVisualDisk.cc
index 6be86f4..65d0c5d 100644
--- a/src/DrawingAreaVisualDisk.cc
+++ b/src/DrawingAreaVisualDisk.cc
@@ -92,7 +92,7 @@ void DrawingAreaVisualDisk::set_static_data( const std::vector<Partition> & part
        {
                visual_partitions .push_back( visual_partition() ) ;
 
-               visual_partitions .back() .partition = partitions[ t ] ; 
+               visual_partitions.back().partition_ptr = & partitions[t];
                Sector partition_length = partitions[ t ] .get_sector_length() ;
                visual_partitions .back() .fraction = partition_length / static_cast<double>( length ) ;
 
@@ -152,12 +152,12 @@ void DrawingAreaVisualDisk::calc_usage( std::vector<visual_partition> & visual_p
 {
        for ( unsigned int t = 0 ; t < visual_partitions .size() ; t++ )
        {
-               if ( visual_partitions[ t ] .partition .type != GParted::TYPE_UNALLOCATED &&
-                    visual_partitions[ t ] .partition .type != GParted::TYPE_EXTENDED       )
+               if ( visual_partitions[t].partition_ptr->type != TYPE_UNALLOCATED &&
+                    visual_partitions[t].partition_ptr->type != TYPE_EXTENDED       )
                {
-                       if ( visual_partitions[ t ] .partition .sector_usage_known() )
+                       if ( visual_partitions[t].partition_ptr->sector_usage_known() )
                        {
-                               visual_partitions[ t ] .partition .get_usage_triple(
+                               visual_partitions[t].partition_ptr->get_usage_triple(
                                                visual_partitions[ t ] .length - BORDER *2,
                                                visual_partitions[ t ] .used_length,
                                                visual_partitions[ t ] .unused_length,
@@ -314,7 +314,7 @@ void DrawingAreaVisualDisk::set_selected( const std::vector<visual_partition> &
                if ( visual_partitions[ t ] .logicals .size() > 0 )
                        set_selected( visual_partitions[t].logicals, partition_ptr );
 
-               if ( ! selected_vp && visual_partitions[t].partition == *partition_ptr )
+               if ( ! selected_vp && *visual_partitions[t].partition_ptr == *partition_ptr )
                        selected_vp = & visual_partitions[ t ] ;
        }
 }
@@ -361,7 +361,7 @@ bool DrawingAreaVisualDisk::on_button_press_event( GdkEventButton * event )
        
        if ( selected_vp )
        {
-               signal_partition_selected.emit( & selected_vp->partition, false );
+               signal_partition_selected.emit( selected_vp->partition_ptr, false );
 
                if ( event ->type == GDK_2BUTTON_PRESS ) 
                        signal_partition_activated .emit() ;