# 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

class DropTargetObject(Object):
    """Rectangular area into which other objects can be dropped."""

    def __init__(self, pos, size, container):
        Object.__init__(self)
        
        self.pos = pos
        self.size = size
        
        self.draggable = False
        self.selectable = False
        
        self.hilite = False
        self.contents = None
        
        self.drop_origin = None
        self.drop_targets = None
        
        self.full = False
        self.shape1 = None
        self.shape2 = None
        
        self.objects = []
        
        self.container = container

    def draw(self, cr):
        cr.rectangle(self.pos.x, self.pos.y, self.size.x, self.size.y)
        
        cr.set_source_rgb(0, 0, 0)
        cr.set_line_width(4.0)
        
        if self.hilite:
            cr.set_dash((10, 10), 0)
        
        cr.stroke()
        
    def add_object(self, obj):
        obj.container = self.container
        obj.pos += self.pos
        self.objects.append(obj)
        self.container.add_object(obj)

    def remove_object(self, obj):
        # Ignore failure to remove when an object has already been removed.
        try:
            self.objects.remove(obj)
        except:
            pass
        
        if self.container:
            self.container.remove_object(obj)
        
    def processDrop(self, draggable_object):
        pass

    def get_bounds(self):
        return self.pos, self.pos + self.size
    
    def contains(self, other_bounds):
        self_bounds_mn, self_bounds_mx = self.get_bounds()
        other_bounds_mn, other_bounds_mx = other_bounds
        
        if other_bounds_mn.x > self_bounds_mn.x \
            and other_bounds_mx.x < self_bounds_mx.x \
            and other_bounds_mn.y > self_bounds_mn.y \
            and other_bounds_mx.y < self_bounds_mx.y :
            return True
        else:
            return False