[gnome-disk-utility] Use floating point in the "Create Partition" dialog

[David Zeuthen <davidz src gnome org>]

commit 89f95c44aaf8f4343f98466ed9bb0df01502527f
Author: David Zeuthen <zeuthen gmail com>
Date:   Tue Dec 4 11:51:41 2012 -0500

    Use floating point in the "Create Partition" dialog
    
    If we use integral values, say creating a 320GB partition on a typical
    320GB disk of size 320,072,933,376 we'll end up with 72MB unused space
    at the end. This is bad (for several reasons) but the previous commit
    (show all holes / unallocated bigger than 1 MiB) makes it even worse.
    
    Signed-off-by: David Zeuthen <zeuthen gmail com>

 data/ui/create-partition-dialog.ui   |    2 ++
 src/disks/gducreatepartitiondialog.c |   22 +++++++++++++---------
 2 files changed, 15 insertions(+), 9 deletions(-)
---
diff --git a/data/ui/create-partition-dialog.ui b/data/ui/create-partition-dialog.ui
index 5791827..3503810 100644
--- a/data/ui/create-partition-dialog.ui
+++ b/data/ui/create-partition-dialog.ui
@@ -133,6 +133,7 @@
                         <property name="activates_default">True</property>
                         <property name="invisible_char_set">True</property>
                         <property name="adjustment">size-adjustment</property>
+                        <property name="digits">3</property>
                       </object>
                       <packing>
                         <property name="expand">False</property>
@@ -197,6 +198,7 @@
                         <property name="activates_default">True</property>
                         <property name="invisible_char_set">True</property>
                         <property name="adjustment">free-following-adjustment</property>
+                        <property name="digits">3</property>
                       </object>
                       <packing>
                         <property name="expand">True</property>
diff --git a/src/disks/gducreatepartitiondialog.c b/src/disks/gducreatepartitiondialog.c
index 650d3f0..beccbc3 100644
--- a/src/disks/gducreatepartitiondialog.c
+++ b/src/disks/gducreatepartitiondialog.c
@@ -199,10 +199,10 @@ static void
 set_unit_num (CreatePartitionData *data,
               gint                 unit_num)
 {
-  guint64 unit_size;
-  guint64 value_units;
-  guint64 max_size_units;
-  guint64 value;
+  gdouble unit_size;
+  gdouble value;
+  gdouble value_units;
+  gdouble max_size_units;
 
   g_assert (unit_num < NUM_UNITS);
 
@@ -214,12 +214,12 @@ set_unit_num (CreatePartitionData *data,
     }
   else
     {
-      value = gtk_adjustment_get_value (data->size_adjustment) * unit_sizes[data->cur_unit_num];
+      value = gtk_adjustment_get_value (data->size_adjustment) * ((gdouble) unit_sizes[data->cur_unit_num]);
     }
 
   unit_size = unit_sizes[unit_num];
   value_units = value / unit_size;
-  max_size_units = data->max_size / unit_size;
+  max_size_units = ((gdouble) data->max_size) / unit_size;
 
   g_object_freeze_notify (G_OBJECT (data->size_adjustment));
   g_object_freeze_notify (G_OBJECT (data->free_following_adjustment));
@@ -241,6 +241,9 @@ set_unit_num (CreatePartitionData *data,
                             100,                    /* page increment */
                             0.0);                   /* page_size */
 
+  gtk_adjustment_set_value (data->size_adjustment, value_units);
+  gtk_adjustment_set_value (data->free_following_adjustment, max_size_units - value_units);
+
   g_object_thaw_notify (G_OBJECT (data->size_adjustment));
   g_object_thaw_notify (G_OBJECT (data->free_following_adjustment));
 }
@@ -300,10 +303,11 @@ size_binding_func (GBinding     *binding,
                    gpointer      user_data)
 {
   CreatePartitionData *data = user_data;
-  guint64 max_size_units;
+  gdouble max_size_units;
 
-  max_size_units = data->max_size / unit_sizes[data->cur_unit_num];
+  max_size_units = ((gdouble) data->max_size) / unit_sizes[data->cur_unit_num];
   g_value_set_double (target_value, max_size_units - g_value_get_double (source_value));
+
   return TRUE;
 }
 
@@ -516,7 +520,7 @@ gdu_create_partition_dialog_show (GduWindow    *window,
           partition_type = "0x05";
         }
 
-      size = floor (gtk_adjustment_get_value (data->size_adjustment)) * unit_sizes[data->cur_unit_num];
+      size = gtk_adjustment_get_value (data->size_adjustment) * unit_sizes[data->cur_unit_num];
       udisks_partition_table_call_create_partition (data->table,
                                                     data->offset,
                                                     size,