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#!/usr/bin/env python
# -*- Mode: Python; py-indent-offset: 4 -*-
# vim: tabstop=4 shiftwidth=4 expandtab
#
# Copyright (C) 2013 Gian Mario Tagliaretti <gianmt@gnome.org>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
# USA
title = "CSS Basics"
description = """
Gtk themes are written using CSS. Every widget is build of multiple items
that you can style very similarly to a regular website.
"""
import os
from gi.repository import Gtk, Gdk, Pango, Gio, GLib
class CSSBasicsApp:
def __init__(self, demoapp):
self.demoapp = demoapp
self.last_good_text = ''
self.window = Gtk.Window()
self.window.set_title('CSS Basics')
self.window.set_default_size(400, 300)
self.window.set_border_width(10)
self.window.connect('destroy', lambda w: Gtk.main_quit())
self.infobar = Gtk.InfoBar()
self.infolabel = Gtk.Label()
self.infobar.get_content_area().pack_start(self.infolabel, False, False, 0)
self.infobar.set_message_type(Gtk.MessageType.WARNING)
scrolled = Gtk.ScrolledWindow()
box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
box.pack_start(scrolled, expand=True, fill=True, padding=0)
box.pack_start(self.infobar, expand=False, fill=True, padding=0)
self.window.add(box)
provider = Gtk.CssProvider()
buffer = Gtk.TextBuffer()
buffer.create_tag(tag_name="warning", underline=Pango.Underline.SINGLE)
buffer.create_tag(tag_name="error", underline=Pango.Underline.ERROR)
buffer.connect("changed", self.css_text_changed, provider)
provider.connect("parsing-error", self.show_parsing_error, buffer)
textview = Gtk.TextView()
textview.set_buffer(buffer)
scrolled.add(textview)
bytes = Gio.resources_lookup_data("/css_basics/css_basics.css", 0)
buffer.set_text(bytes.get_data().decode('utf-8'))
self.apply_css(self.window, provider)
self.window.show_all()
self.infobar.hide()
def apply_css(self, widget, provider):
Gtk.StyleContext.add_provider(widget.get_style_context(),
provider,
Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)
if isinstance(widget, Gtk.Container):
widget.forall(self.apply_css, provider)
def show_parsing_error(self, provider, section, error, buffer):
start = buffer.get_iter_at_line_index(section.get_start_line(),
section.get_start_position())
end = buffer.get_iter_at_line_index(section.get_end_line(),
section.get_end_position())
if error:
tag_name = "error"
self.infolabel.set_text(error.message)
self.infobar.show_all()
else:
tag_name = "warning"
buffer.apply_tag_by_name(tag_name, start, end)
def css_text_changed(self, buffer, provider):
start = buffer.get_start_iter()
end = buffer.get_end_iter()
buffer.remove_all_tags(start, end)
text = buffer.get_text(start, end, False).encode('utf-8')
# Ignore CSS errors as they are shown by highlighting
try:
provider.load_from_data(text)
except GLib.GError as e:
if e.domain == 'gtk-css-provider-error-quark':
provider.load_from_data(self.last_good_text)
else:
raise e
else:
self.last_good_text = text
self.infobar.hide()
Gtk.StyleContext.reset_widgets(Gdk.Screen.get_default())
def main(demoapp=None):
CSSBasicsApp(demoapp)
Gtk.main()
if __name__ == '__main__':
base_path = os.path.abspath(os.path.dirname(__file__))
resource_path = os.path.join(base_path, '../data/demo.gresource')
resource = Gio.Resource.load(resource_path)
# FIXME: method register() should be without the underscore
# FIXME: see https://bugzilla.gnome.org/show_bug.cgi?id=684319
resource._register()
main()
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