# 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 draggableobject import DraggableObject
from vector import Vector

import gtk
from movableobject import MovableObject

class SymbolMovableObject(MovableObject):
    """Draggable symbol."""

    def __init__(self, pos, symbol, drop_targets, container, size=50):
        MovableObject.__init__(self)

        self.pos = pos
        self.symbol = symbol
        self.size = size
        
        # Assume massive width and height until set by draw.
        self.width = 10000 
        self.height = 10000
        
        self.selectable = True
        self.rotatable = False
        
        self.use_minimum_width_and_height = False
        
        self.drag_copy = True
        
        self.drop_targets = drop_targets
        self.container = container

    def draw(self, cr):
        text = self.symbol
        
        if self.dragged:
            # The line segment gets transparent when dragged.
            cr.set_source_rgba(0, 0, 0, 0.5)
        else:
            # Otherwise, it's black.
            cr.set_source_rgb(0, 0, 0)
        
        cr.set_font_size(self.size)
        x_bearing, y_bearing, width, height = cr.text_extents(text)[:4]
               
        if self.use_minimum_width_and_height:
            letter_width = width
            letter_height = height
            width = 75
            height = 75
            cr.move_to(self.pos.x - x_bearing - width/2 + width/2 - letter_width/2, self.pos.y - y_bearing - height/2 + height/2 - letter_height/2)
            cr.show_text(text)
        else:
            cr.move_to(self.pos.x - x_bearing - width/2, self.pos.y - y_bearing - height/2) 
            cr.show_text(text)
           
        if self.use_minimum_width_and_height:
            width = 75
            height = 75

        if self.selected:
            cr.rectangle(self.pos.x - 5 - width/2, self.pos.y - 5 - height/2, width + 10, height + 10)    
            cr.set_line_width(1.0)
            # Draw a different dashed outline if the object is not only selected but dragged.
            if self.dragged:
                cr.set_dash((2, 2, 0))
            else:
                cr.set_dash((10, 10), 0)
            cr.set_source_rgb(0, 0, 0)
            cr.stroke()
        
        self.width = width
        self.height = height

    def get_bounds(self):
        hsz = Vector(self.width/2 + 5, self.height/2 + 5)
        return self.pos - hsz, self.pos + hsz