# Copyright 2008 by Peter Moxhay and Wade Brainerd.  
# This file is part of Math.
#
# Math 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 3 of the License, or
# (at your option) any later version.
# 
# Math 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 Math.  If not, see <http://www.gnu.org/licenses/>.
from objectarea import Object
from vector import Vector

import gtk, rsvg

ARROW_SVG = rsvg.Handle('next_arrow.svg')

class NextProblemObject(Object):
    """Large clickable arrow which advances to the next problem."""

    def __init__(self):
        Object.__init__(self)
        
        self.draggable = False
        self.selectable = True
        
        self.pressed = False

    def draw(self, cr):
        cr.save()

        cr.rectangle(0, 0, 1200, 900)
        cr.set_source_rgba(0.9, 0.9, 0.9, 0.5)
        cr.fill()

        cr.translate(600-250, 400-250)
        ARROW_SVG.render_cairo(cr)

        cr.restore()

    def get_bounds(self):
        return Vector(0, 0), Vector(1200,900)

    def on_mouse(self, event):
        if event.type == gtk.gdk.BUTTON_PRESS:
            self.pressed = True
            return True
        if self.pressed and event.type == gtk.gdk.BUTTON_RELEASE:
            self.container.finish_next_problem_arrow()
            return True

    def on_key(self, event):
        key_name = gtk.gdk.keyval_name(event.keyval)
        
        # Useful print for determining the names of keys.
        #print "NextProblemObject got a key press:",key_name
        
        if key_name == 'KP_Up' \
                or key_name == 'KP_Down' \
                or key_name == 'KP_Left' \
                or key_name == 'KP_Right' \
                or key_name == 'KP_Page_Up' \
                or key_name == 'KP_Page_Down' \
                or key_name == 'KP_End' \
                or key_name == 'Return' \
                or key_name == 'space':
            self.container.finish_next_problem_arrow()
            return True