improved the algorithm to deal with lost pixels after seeing some problems

* include/FrameVisualDisk.h,
  src/FrameVisualDisk.cc: improved the algorithm to deal with lost
  pixels after seeing some problems with rather insane
  partitiontables.
* src/Dialog_Partition_Info.cc: minor cleanup
* src/GParted_Core.cc: show error in partitioninfo if statvfs fails
* src/TreeView_Detail.cc: added FIXME

ChangeLog

@@ -1,3 +1,13 @@
+2006-03-02 Bart Hakvoort <hakvoort@cvs.gnome.org>
+
+	* include/FrameVisualDisk.h,
+	  src/FrameVisualDisk.cc: improved the algorithm to deal with lost
+	  pixels after seeing some problems with rather insane
+	  partitiontables.
+	* src/Dialog_Partition_Info.cc: minor cleanup
+	* src/GParted_Core.cc: show error in partitioninfo if statvfs fails
+	* src/TreeView_Detail.cc: added FIXME
+	
 2006-03-01 Bart Hakvoort <hakvoort@cvs.gnome.org>
 
 	* src/Dialog_Base_Partition.cc,

include/FrameVisualDisk.h

@@ -59,6 +59,7 @@ private:
 	bool set_selected( std::vector<visual_partition> & visual_partitions, int x, int y ) ;
 	void set_selected( std::vector<visual_partition> & visual_partitions, const Partition & partition ) ;
 	
+	int spreadout_leftover_px( std::vector<visual_partition> & visual_partitions, int pixels ) ;
 	void free_colors( std::vector<visual_partition> & visual_partitions ) ;
 	
 	//signalhandlers

src/FrameVisualDisk.cc

@@ -357,7 +357,7 @@ void FrameVisualDisk::on_resize( Gtk::Allocation & allocation )
 {
 	MIN_SIZE = 20 ;
 
-	int calced, TOTAL ;
+	int calced = 0, TOTAL ;
 	do
 	{
 		TOTAL = allocation .get_width() - TOT_SEP ;
@@ -373,16 +373,44 @@ void FrameVisualDisk::on_resize( Gtk::Allocation & allocation )
 	}
 	while ( TOTAL <= 0 && MIN_SIZE > 0 ) ; 
 
-	//due to rounding a few px may be lost (max. 2), lets add these to the last partition.
+	//due to rounding a few px may be lost. here we salvage them.. 
-	//FIXME: instead of adding all leftover px to the last partition we should spread them over all partitions
+	if ( visual_partitions .size() && calced > 0 )
-	if ( allocation .get_width() > calced && visual_partitions .size() )
+	{
-		visual_partitions .back() .length += ( allocation .get_width() - calced ) ;
+		int px_left = allocation .get_width() - calced ;
 
+		while ( px_left > 0 )
+			px_left = spreadout_leftover_px( visual_partitions, px_left ) ;
+	}
+	
+	//and calculate the rest..
 	calc_position_and_height( visual_partitions, 0, 0 ) ;
 	calc_used_unused( visual_partitions ) ;
 	calc_text( visual_partitions ) ;
 }
 	
+int FrameVisualDisk::spreadout_leftover_px( std::vector<visual_partition> & visual_partitions, int pixels ) 
+{
+	int extended = -1 ;
+
+	for ( unsigned int t = 0 ; t < visual_partitions .size() && pixels > 0 ; t++ )
+		if ( ! visual_partitions[ t ] .logicals .size() )
+		{
+			visual_partitions[ t ] .length++ ;
+			pixels-- ;
+		}
+		else
+			extended = t ;
+
+	if ( extended > -1 && pixels > 0 )
+	{	
+		int actually_used = pixels - spreadout_leftover_px( visual_partitions[ extended ] .logicals, pixels ) ; 
+		visual_partitions[ extended ] .length += actually_used ;
+		pixels -= actually_used ;
+	}
+	
+	return pixels ;
+}
+
 void FrameVisualDisk::free_colors( std::vector<visual_partition> & visual_partitions ) 
 {
 	for ( unsigned int t = 0 ; t < visual_partitions .size() ; t++ )

src/GParted_Core.cc

@@ -1,5 +1,6 @@
 #include "../include/GParted_Core.h"
 
+#include <cerrno>
 #include <sys/statvfs.h>	
 
 Glib::ustring ped_error ; //see e.g. ped_exception_handler()
@@ -437,6 +438,9 @@ void GParted_Core::set_used_sectors( std::vector<Partition> & partitions )
 				{
 					if ( statvfs( partitions[ t ] .mountpoints .back() .c_str(), &sfs ) == 0 )
 						partitions[ t ] .Set_Unused( sfs .f_bfree * (sfs .f_bsize / 512) ) ;
+					else
+						partitions[ t ] .error = 
+							"statvfs (" + partitions[ t ] .mountpoints .back() + "): " + Glib::strerror( errno );
 				}
 				else
 				{
@@ -761,8 +765,7 @@ void GParted_Core::LP_Set_Used_Sectors( Partition & partition )
 				constraint = ped_file_system_get_resize_constraint( fs ) ;
 				if ( constraint )
 				{
-					partition .Set_Unused( 
+					partition .Set_Unused( partition .get_length() - constraint ->min_size ) ;
-						(partition .sector_end - partition .sector_start) - constraint ->min_size ) ;
 					
 					ped_constraint_destroy( constraint );
 				}

src/TreeView_Detail.cc

@@ -140,7 +140,8 @@ bool TreeView_Detail::set_selected( Gtk::TreeModel::Children rows, const Partiti
 
 void TreeView_Detail::create_row( const Gtk::TreeRow & treerow, const Partition & partition )
 {
-	//hereby i assume these 2 are mutual exclusive. is this wise?? Time (and bugreports) will tell :)
+	//FIXME: this approach is too simplistic, we need to display the lock AND the warning icon if necessary
+	//e.g. if statvfs in the core fails, we need to display both icons...
 	if ( partition .busy )
 		treerow[ treeview_detail_columns .status_icon ] = render_icon( Gtk::Stock::DIALOG_AUTHENTICATION, Gtk::ICON_SIZE_BUTTON );
 	else if ( partition .error != "" )