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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
"""
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")
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