Show alert when available space is below 50MB #7588

The modal alert encourages to delete old journal entries. Available
space is checked on boot and when creating or updating journal
entries.

2 files changed, 126 insertions, 1 deletions

diff --git a/journalactivity.py b/journalactivity.py
index f531e0f..12099b6 100755
--- a/journalactivity.py
+++ b/journalactivity.py
@@ -23,10 +23,13 @@ import uuid
 
 import gtk
 import dbus
+import statvfs
+import os
 
 from sugar.activity import activity
 from sugar.bundle.bundle import ZipExtractException, RegistrationException
 from sugar.datastore import datastore
+from sugar import env
 
 from journaltoolbox import MainToolbox, DetailToolbox
 from listview import ListView
@@ -35,6 +38,7 @@ from volumestoolbar import VolumesToolbar
 import misc
 from journalentrybundle import JournalEntryBundle
 from objectchooser import ObjectChooser
+from modalalert import ModalAlert
 
 DS_DBUS_SERVICE = 'org.laptop.sugar.DataStore'
 DS_DBUS_INTERFACE = 'org.laptop.sugar.DataStore'
@@ -44,6 +48,8 @@ J_DBUS_SERVICE = 'org.laptop.Journal'
 J_DBUS_INTERFACE = 'org.laptop.Journal'
 J_DBUS_PATH = '/org/laptop/Journal'
 
+_SPACE_TRESHOLD = 52428800
+
 class JournalActivityDBusService(dbus.service.Object):
     def __init__(self, parent):
         self._parent = parent
@@ -143,6 +149,9 @@ class JournalActivity(activity.Activity):
         self._dbus_service = JournalActivityDBusService(self)        
 
         self.iconify()
+        
+        self._critical_space_alert = None
+        self._check_available_space()
 
     def can_close(self):
         return False
@@ -242,7 +251,8 @@ class JournalActivity(activity.Activity):
         finally:
             jobject.destroy()
         self._main_toolbox.search_toolbar.refresh_filters()
-        
+        self._check_available_space()
+
     def __data_store_updated_cb(self, uid):
         jobject = datastore.get(uid)
         if jobject is None:
@@ -251,6 +261,7 @@ class JournalActivity(activity.Activity):
             self._check_for_bundle(jobject)
         finally:
             jobject.destroy()
+        self._check_available_space()
 
     def __data_store_deleted_cb(self, uid):
         if self.canvas == self._secondary_view and \
@@ -302,3 +313,24 @@ class JournalActivity(activity.Activity):
         visible = event.state != gtk.gdk.VISIBILITY_FULLY_OBSCURED
         self._list_view.set_is_visible(visible)
 
+    def _check_available_space(self):
+        ''' Check available space on device
+
+            If the available space is below 50MB an alert will be 
+            shown which encourages to delete old journal entries. 
+        '''
+
+        if self._critical_space_alert:
+            return
+        stat = os.statvfs(env.get_profile_path())
+        free_space = stat[statvfs.F_BSIZE] * stat[statvfs.F_BAVAIL]
+        if free_space < _SPACE_TRESHOLD:
+            self._critical_space_alert = ModalAlert()
+            self._critical_space_alert.connect('destroy', 
+                                               self.__alert_closed_cb)
+            self._critical_space_alert.show()
+        
+    def __alert_closed_cb(self, data):  
+        self._show_main_view()
+        self.present()
+        self._critical_space_alert = None
diff --git a/modalalert.py b/modalalert.py
new file mode 100644
index 0000000..543a9ea
--- /dev/null
+++ b/modalalert.py
@@ -0,0 +1,93 @@
+# Copyright (C) 2008 One Laptop Per Child
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+import gtk
+from gettext import gettext as _
+
+from sugar.graphics.icon import Icon
+from sugar.graphics import style
+from sugar import profile
+
+class ModalAlert(gtk.Window):    
+
+    __gtype_name__ = 'SugarModalAlert'
+
+    def __init__(self):
+        gtk.Window.__init__(self)
+
+        self.set_border_width(style.LINE_WIDTH)
+        offset = style.GRID_CELL_SIZE
+        width = gtk.gdk.screen_width() - offset * 2
+        height = gtk.gdk.screen_height() - offset * 2
+        self.set_size_request(width, height)
+        self.set_position(gtk.WIN_POS_CENTER_ALWAYS) 
+        self.set_decorated(False)
+        self.set_resizable(False)
+        self.set_modal(True)
+        
+        self._main_view = gtk.EventBox()
+        self._vbox = gtk.VBox()        
+        self._vbox.set_spacing(style.DEFAULT_SPACING)
+        self._vbox.set_border_width(style.GRID_CELL_SIZE * 2)
+        self._main_view.modify_bg(gtk.STATE_NORMAL, 
+                                  style.COLOR_BLACK.get_gdk_color())
+        self._main_view.add(self._vbox)
+        self._vbox.show()
+
+        icon = Icon(file='activity/activity-journal.svg', 
+                    pixel_size=style.XLARGE_ICON_SIZE,
+                    xo_color=profile.get_color())
+        self._vbox.pack_start(icon, False)
+        icon.show()
+
+        self._title = gtk.Label()
+        self._title.modify_fg(gtk.STATE_NORMAL, 
+                              style.COLOR_WHITE.get_gdk_color())
+        self._title.set_markup('<b>%s</b>' % _('Your Journal is full'))  
+        self._vbox.pack_start(self._title, False)
+        self._title.show()
+
+        self._message = gtk.Label(_('Please delete some old Journal' 
+                                    ' entries to make space for new ones.'))
+        self._message.modify_fg(gtk.STATE_NORMAL, 
+                              style.COLOR_WHITE.get_gdk_color())
+        self._vbox.pack_start(self._message, False)        
+        self._message.show()
+
+        alignment = gtk.Alignment(xalign=0.5, yalign=0.5)
+        self._vbox.pack_start(alignment, expand=False)
+        alignment.show()
+
+        self._show_journal = gtk.Button()
+        self._show_journal.set_label(_('Show Journal'))
+        alignment.add(self._show_journal)
+        self._show_journal.show()
+        self._show_journal.connect('clicked', self.__show_journal_cb)
+
+        self.add(self._main_view)
+        self._main_view.show()
+
+        self.connect("realize", self.__realize_cb)
+
+    def __realize_cb(self, widget):
+        self.window.set_type_hint(gtk.gdk.WINDOW_TYPE_HINT_DIALOG)
+        self.window.set_accept_focus(True)
+
+    def __show_journal_cb(self, button):
+        '''The opener will listen on the destroy signal
+        '''
+        self.destroy()
+