# 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
"""
This module represents TextBubble widget. Also, it aims to be a short example
of drawing with Cairo.
"""

import gtk
from math import pi as M_PI
import cairo

# FIXME set as subclass of gtk.Widget, not EventBox
class TextBubble(gtk.EventBox):
    def __init__(self, label):
        gtk.EventBox.__init__(self)

        ##self.set_app_paintable(True) # else may be blank
         # FIXME ensure previous call does not interfere with widget stacking
        self.label = label
        self.lineWidth = 5

        self.connect("expose-event", self._on_expose)

    def __draw_with_cairo__(self, context):
        """

        """
        pass

    def _on_expose(self, widget, event):
        """Redraw event callback."""
        # TODO
        ctx = self.window.cairo_create()

        # set drawing region. Useless since this widget has its own window.
        ##region = gtk.gdk.region_rectangle(self.allocation)
        ##region.intersect(gtk.gdk.region_rectangle(event.area))
        ##ctx.region(region)
        ##ctx.rectangle(event.area.x, event.area.y, event.area.width, event.area.height)
        ##ctx.clip()

        ##import pdb; pdb.set_trace()
        ##ctx.set_operator(cairo.OPERATOR_CLEAR)
        ##ctx.paint()
        ##ctx.set_operator(cairo.OPERATOR_OVER)

        width = self.allocation.width
        height = self.allocation.height
        xradius = width/2
        yradius = height/2
        width -= self.lineWidth
        height -= self.lineWidth
        ctx.move_to(self.lineWidth, yradius)
        ctx.curve_to(self.lineWidth, self.lineWidth,
            self.lineWidth, self.lineWidth, xradius, self.lineWidth)
        ctx.curve_to(width, self.lineWidth,
            width, self.lineWidth, width, yradius)
        ctx.curve_to(width, height, width, height, xradius, height)
        ctx.curve_to(self.lineWidth, height,
            self.lineWidth, height, self.lineWidth, yradius)
        ctx.set_source_rgb(1.0, 1.0, 1.0)
        ctx.fill_preserve()
        ctx.set_line_width(self.lineWidth)
        ctx.set_source_rgb(0.0, 0.0, 0.0)
        ctx.stroke()

        _, _, textWidth, textHeight, _, _ = ctx.text_extents(self._label)
        ctx.move_to(int((self.allocation.width-textWidth)/2),
            int((self.allocation.height+textHeight)/2))
        ctx.text_path(self._label)
        ctx.fill()

        return True


    def _set_label(self, value):
        """Sets the label and flags the widget to be redrawn."""
        self._label = value
        # FIXME hack to calculate size. necessary because may not have been
        # realized
        surf = cairo.SVGSurface("/dev/null", 0, 0)
        ctx = cairo.Context(surf)
        _, _, width, height, _, _ = ctx.text_extents(self._label)
        del ctx, surf

        # FIXME bogus values follows
        self.set_size_request(int(width+20), int(height+40))
        # TODO test changing a realized label

    def _get_label(self):
        """Getter method for the label property"""
        return self._label

    label = property(fget=_get_label, fset=_set_label,\
        doc="Text label which is to be painted on the top of the widget")