"""
GTK+ Matplotlib interface using cairo (not GDK) drawing operations.
Author: Steve Chaplin
"""
import gtk
if gtk.pygtk_version < (2,7,0):
    import cairo.gtk

import matplotlib.backends.backend_cairo as be_cairo
from   matplotlib.backends.backend_gtk import *

backend_version = 'PyGTK(%d.%d.%d) ' % gtk.pygtk_version + \
                  'Pycairo(%s)' % be_cairo.backend_version


_debug = False
#_debug = True


def new_figure_manager(num, *args, **kwargs):
    """
    Create a new figure manager instance
    """
    if _debug: print 'backend_gtkcairo.%s()' % fn_name()
    thisFig = Figure(*args, **kwargs)
    canvas = FigureCanvasGTKCairo(thisFig)
    return FigureManagerGTK(canvas, num)


class RendererGTKCairo (be_cairo.RendererCairo):
    def set_pixmap (self, pixmap):
        if gtk.pygtk_version >= (2,7,0):
            self.ctx = pixmap.cairo_create()
        else:
            self.ctx = cairo.gtk.gdk_cairo_create (pixmap)
        self.ctx.save()  # restore, save  - when call new_gc()


class FigureCanvasGTKCairo(FigureCanvasGTK):
    def _renderer_init(self):
        """Override to use cairo (rather than GDK) renderer"""
        if _debug: print '%s.%s()' % (self.__class__.__name__, _fn_name())
        self._renderer = RendererGTKCairo (self.figure.dpi)


class FigureManagerGTKCairo(FigureManagerGTK):
    def _get_toolbar(self, canvas):
        # must be inited after the window, drawingArea and figure
        # attrs are set
        if matplotlib.rcParams['toolbar']=='classic':
            toolbar = NavigationToolbar (canvas, self.window)
        elif matplotlib.rcParams['toolbar']=='toolbar2':
            toolbar = NavigationToolbar2GTKCairo (canvas, self.window)
        else:
            toolbar = None
        return toolbar


class NavigationToolbar2Cairo(NavigationToolbar2GTK):
    def _get_canvas(self, fig):
        return FigureCanvasGTKCairo(fig)
