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# Copyright 2007 Benjamin M. Schwartz
#
# 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
import gobject
import arange
import locale
from gettext import gettext as _
def _label_factory(label, toolbar):
''' Factory for adding a label to a toolbar '''
my_label = gtk.Label(label)
my_label.set_line_wrap(True)
my_label.show()
_toolitem = gtk.ToolItem()
_toolitem.add(my_label)
toolbar.insert(_toolitem, -1)
_toolitem.show()
return my_label
def _entry_factory(length, toolbar, callback):
''' Factory for adding a text enrty to a toolbar '''
my_entry = gtk.Entry()
my_entry.set_max_length(length)
my_entry.set_width_chars(length)
my_entry.connect('changed', callback)
my_entry.show()
_toolitem = gtk.ToolItem()
_toolitem.add(my_entry)
toolbar.insert(_toolitem, -1)
_toolitem.show()
return my_entry
def _separator_factory(toolbar, expand=False, visible=False):
""" add a separator to a toolbar """
_separator = gtk.SeparatorToolItem()
_separator.props.draw = visible
_separator.set_expand(expand)
toolbar.insert(_separator, -1)
_separator.show()
class TempToolbar(gtk.Toolbar):
_speed = 0
def __init__(self):
gtk.Toolbar.__init__(self)
temp_label = _label_factory(_("Temperature (C): "), self)
self._temp_field = _entry_factory(6, self, self._update_cb)
_separator_factory(self)
humid_label = _label_factory(_("Relative Humidity (%): "), self)
self._humid_field = _entry_factory(5, self, self._update_cb)
_separator_factory(self)
results_label = _label_factory(_("Speed of Sound (m/s): "), self)
self._result = _label_factory('', self)
self.set_temp(25)
self.set_humid(60)
self.update_speed()
def get_temp(self):
try:
t = locale.atof(self._temp_field.get_text())
except:
return None
if t > 70:
return None
if t < -20:
return None
return t
def set_temp(self, t):
try:
self._temp_field.set_text(locale.str(max(-20, min(70, t))))
return True
except:
return False
def get_humid(self):
try:
t = locale.atof(self._humid_field.get_text())
except:
return None
if t > 100:
return None
if t < 0:
return None
return t
def set_humid(self, h):
try:
self._humid_field.set_text(locale.str(max(0, min(100, h))))
return True
except:
return False
def get_speed(self):
return self._speed
def _set_speed(self, s):
self._speed = s
try:
self._result.set_text(locale.format('%.2f', s))
return True
except:
return False
def _update_cb(self, widget=None):
gobject.idle_add(self.update_speed)
def update_speed(self):
t = self.get_temp()
h = self.get_humid()
if (t is not None) and (h is not None):
s = arange.speed_of_sound(t, h / 100)
self._set_speed(s)
else:
self._result.set_text('')
return False
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