# Miro - an RSS based video player application
# Copyright (C) 2005-2009 Participatory Culture Foundation
#
# 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
#
# In addition, as a special exception, the copyright holders give
# permission to link the code of portions of this program with the OpenSSL
# library.
#
# You must obey the GNU General Public License in all respects for all of
# the code used other than OpenSSL. If you modify file(s) with this
# exception, you may extend this exception to your version of the file(s),
# but you are not obligated to do so. If you do not wish to do so, delete
# this exception statement from your version. If you delete this exception
# statement from all source files in the program, then also delete it here.

"""miro.frontends.widgets.gtk.drawing -- Contains classes used to draw on
widgets.
"""

import math

import cairo
import gobject
import gtk
import pango

from miro.frontends.widgets.gtk import wrappermap
from miro.frontends.widgets.gtk.base import Widget, Bin
from miro.frontends.widgets.gtk.layoutmanager import LayoutManager
from miro.plat.frontends.widgets import use_custom_titlebar_background

class ImageSurface:
    def __init__(self, image):
        format = cairo.FORMAT_RGB24
        if image.pixbuf.get_has_alpha():
            format = cairo.FORMAT_ARGB32
        self.image = cairo.ImageSurface(format, image.width, image.height)
        context = cairo.Context(self.image)
        gdkcontext = gtk.gdk.CairoContext(context)
        gdkcontext.set_source_pixbuf(image.pixbuf, 0, 0)
        gdkcontext.paint()
        self.pattern = cairo.SurfacePattern(self.image)
        self.pattern.set_extend(cairo.EXTEND_REPEAT)
        self.width = image.width
        self.height = image.height

    def get_size(self):
        return self.width, self.height

    def draw(self, context, x, y, width, height, fraction=1.0):
        m = cairo.Matrix()
        m.translate(-x, -y)
        self.pattern.set_matrix(m)
        cairo_context = context.context
        cairo_context.save()
        cairo_context.set_source(self.pattern)
        cairo_context.new_path()
        cairo_context.rectangle(x, y, width, height)
        if fraction >= 1.0:
            cairo_context.fill()
        else:
            cairo_context.clip()
            cairo_context.paint_with_alpha(fraction)
        cairo_context.restore()

class DrawingStyle(object):
    def __init__(self, widget, use_base_color=False, state=None):
        if state is None:
            state = widget._widget.state
        self.use_custom_style = widget.use_custom_style
        self.use_custom_titlebar_background = use_custom_titlebar_background
        self.style = widget._widget.style
        self.text_color = widget.convert_gtk_color(self.style.text[state])
        if use_base_color:
            self.bg_color = widget.convert_gtk_color(self.style.base[state])
        else:
            self.bg_color = widget.convert_gtk_color(self.style.bg[state])

class DrawingContext(object):
    """DrawingContext.  This basically just wraps a Cairo context and adds a
    couple convenience methods.
    """

    def __init__(self, window, drawing_area, expose_area):
        self.window = window
        self.context = window.cairo_create()
        self.context.rectangle(expose_area.x, expose_area.y, 
                expose_area.width, expose_area.height)
        self.context.clip()
        self.width = drawing_area.width
        self.height = drawing_area.height
        self.context.translate(drawing_area.x, drawing_area.y)

    def __getattr__(self, name):
        return getattr(self.context, name)

    def set_color(self, (red, green, blue), alpha=1.0):
        self.context.set_source_rgba(red, green, blue, alpha)

    def set_shadow(self, color, opacity, offset, blur_radius):
        pass

    def gradient_fill(self, gradient):
        old_source = self.context.get_source()
        self.context.set_source(gradient.pattern)
        self.context.fill()
        self.context.set_source(old_source)

    def gradient_fill_preserve(self, gradient):
        old_source = self.context.get_source()
        self.context.set_source(gradient.pattern)
        self.context.fill_preserve()
        self.context.set_source(old_source)

class Gradient(object):
    def __init__(self, x1, y1, x2, y2):
        self.pattern = cairo.LinearGradient(x1, y1, x2, y2)

    def set_start_color(self, (red, green, blue)):
        self.pattern.add_color_stop_rgb(0, red, green, blue)

    def set_end_color(self, (red, green, blue)):
        self.pattern.add_color_stop_rgb(1, red, green, blue)

class CustomDrawingMixin(object):
    def do_expose_event(self, event):
        wrapper = wrappermap.wrapper(self)
        if self.flags() & gtk.NO_WINDOW:
            drawing_area = self.allocation
        else:
            drawing_area = gtk.gdk.Rectangle(0, 0, 
                    self.allocation.width, self.allocation.height)
        context = DrawingContext(event.window, drawing_area, event.area)
        context.style = DrawingStyle(wrapper)
        if self.flags() & gtk.CAN_FOCUS:
            focus_space = (self.style_get_property('focus-padding') +
                    self.style_get_property('focus-line-width'))
            if not wrapper.squish_width:
                context.width -= focus_space * 2
                translate_x = focus_space
            else:
                translate_x = 0
            if not wrapper.squish_height:
                context.height -= focus_space * 2
                translate_y = focus_space
            else:
                translate_y = 0
            context.translate(translate_x, translate_y)
        wrapper.layout_manager.update_cairo_context(context.context)
        self.draw(wrapper, context)

    def draw(self, wrapper, context):
        wrapper.layout_manager.reset()
        wrapper.draw(context, wrapper.layout_manager)

    def do_size_request(self, requesition):
        wrapper = wrappermap.wrapper(self)
        width, height = wrapper.size_request(wrapper.layout_manager)
        requesition.width = width
        requesition.height = height
        if self.flags() & gtk.CAN_FOCUS:
            focus_space = (self.style_get_property('focus-padding') +
                    self.style_get_property('focus-line-width'))
            if not wrapper.squish_width:
                requesition.width += focus_space * 2
            if not wrapper.squish_height:
                requesition.height += focus_space * 2

class MiroDrawingArea(CustomDrawingMixin, gtk.Widget):
    def __init__(self):
        gtk.Widget.__init__(self)
        self.set_flags(gtk.NO_WINDOW)

class BackgroundWidget(CustomDrawingMixin, gtk.Bin):
    def do_size_request(self, requesition):
        CustomDrawingMixin.do_size_request(self, requesition)
        if self.get_child():
            child_width, child_height = self.get_child().size_request()
            requesition.width = max(child_width, requesition.width)
            requesition.height = max(child_height, requesition.height)

    def do_expose_event(self, event):
        CustomDrawingMixin.do_expose_event(self, event)
        if self.get_child():
            self.propagate_expose(self.get_child(), event)

    def do_size_allocate(self, allocation):
        gtk.Bin.do_size_allocate(self, allocation)
        if self.get_child():
            self.get_child().size_allocate(allocation)

gobject.type_register(MiroDrawingArea)
gobject.type_register(BackgroundWidget)

class Drawable:
    def __init__(self):
        self.squish_width = self.squish_height = False

    def set_squish_width(self, setting):
        self.squish_width = setting

    def set_squish_height(self, setting):
        self.squish_height = setting

    def set_widget(self, drawing_widget):
        if self.is_opaque() and 0:
            box = gtk.EventBox()
            box.add(drawing_widget)
            Widget.set_widget(self, box)
        else:
            Widget.set_widget(self, drawing_widget)
        self.layout_manager = LayoutManager(self._widget)

    def size_request(self, layout_manager):
        return 0, 0

    def draw(self, context, layout_manager):
        pass

    def is_opaque(self):
        return False

class DrawingArea(Drawable, Widget):
    def __init__(self):
        Widget.__init__(self)
        Drawable.__init__(self)
        self.set_widget(MiroDrawingArea())

class Background(Drawable, Bin):
    def __init__(self):
        Bin.__init__(self)
        Drawable.__init__(self)
        self.set_widget(BackgroundWidget())
