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# Copyright (C) 2009, Tutorius.org
#
# 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 gtk import gdk
import logging
class Rating(gtk.Widget):
"""
Controls that display the rating of a tutorial using colored stars
"""
def __init__(self,tutorial,controller, rating=0,editable = False):
"""
Constructor
@param the controller to link the view with
@param tutorial The tutorial for which this rating is
@param rating The rating to show
@param editable True if the rating may be edited
"""
gtk.Widget.__init__(self)
self.tutorial = tutorial
self.controller = controller
self.editable = editable
self.rating = rating
#star size is 24 pixels by 24 pixels
self.image_length = 24
def do_realize(self):
self.set_flags(self.flags() | gtk.REALIZED)
self.window = gtk.gdk.Window(
self.get_parent_window(),
width=self.allocation.width,
height=self.allocation.height,
window_type=gdk.WINDOW_CHILD,
wclass=gdk.INPUT_OUTPUT,
event_mask=self.get_events() | gtk.gdk.EXPOSURE_MASK
| gtk.gdk.BUTTON_PRESS_MASK)
self.window.set_user_data(self)
self.style.attach(self.window)
self.style.set_background(self.window, gtk.STATE_NORMAL)
self.window.move_resize(*self.allocation)
#load the stars
pixbuf = gtk.gdk.pixbuf_new_from_file('full_star.png')
self.full_star,mask = pixbuf.render_pixmap_and_mask()
pixbuf = gtk.gdk.pixbuf_new_from_file('half_star.png')
self.half_star,mask = pixbuf.render_pixmap_and_mask()
image = gtk.Image()
pixbuf = gtk.gdk.pixbuf_new_from_file('grayed_star.png')
self.empty_star,mask =pixbuf.render_pixmap_and_mask()
self.gc = self.style.fg_gc[gtk.STATE_NORMAL]
def do_unrealize(self):
self.window.destroy()
def do_size_request(self, requisition):
requisition.height = self.image_length
requisition.width = (self.image_length * 5)
def do_size_allocate(self, allocation):
self.allocation = allocation
if self.flags() & gtk.REALIZED:
self.window.move_resize(*allocation)
def do_expose_event(self, event):
"""
The widget is drawn here
"""
value = self.rating
stars = [0,0,0,0,0]
if value > 0:
for x in range(5):
if value -1 > 0:
stars[x]=1
elif value -1 == -0.5:
stars[x] = 0.5
break
else:
stars[x]=1
break
value -= 1
for x in range(0,5):
if stars[x] == 0:
self.window.draw_drawable(self.gc, self.empty_star, 0, 0
, x*self.image_length
, 0,-1, -1)
elif stars[x] == 0.5:
self.window.draw_drawable(self.gc, self.half_star, 0, 0
, x*self.image_length
, 0,-1, -1)
elif stars[x] == 1:
self.window.draw_drawable(self.gc, self.full_star, 0, 0
, x*self.image_length
, 0,-1, -1)
def do_button_press_event(self, event):
"""When the button is pressed"""
# make sure it was the first button
if self.editable:
if event.button == 1:
#check for new stars
self.check_for_new_stars(event.x)
return True
def check_for_new_stars(self, xPos):
"""
Computes the star number based on where the click was
"""
new_stars = int(xPos / self.image_length)
half_star = xPos % self.image_length
logging.info("xpos: %d, new_stars: %d, half_star: %d",xPos,new_stars,half_star)
if half_star > self.image_length/2:
new_stars +=1
else:
new_stars = new_stars+0.5
logging.info("rating: %f",new_stars)
self.controller.rate_tutorial(self.tutorial,new_stars)
self.set_value(new_stars)
def set_value(self, value):
"""
Sets the value and force a redraw
"""
if (value >= 0):
self.rating = value
#check for the maximum
if (self.rating > 5):
self.rating = 5
# redraw the widget
self.queue_draw()
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