Pygobject (103) CSS Series--transition transition effect

Example

Example

Code:

#!/usr/bin/env Python3 # Section 153 #-*-Mode:python; Py-indent-offset:4-*-# vim:tabstop=4 shiftwidth=4 expandtab # Copyright (C) 2013 Gian Mario Tagliaretti <gianmt@g Nome.org> # This library are free software; 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'll be useful, # but without any WARRANTY;  Without even the implied warranty of # merchantability or FITNESS for A particular purpose.
The GNU # Lesser general public License for more details. # You are should have received a copy of the GNU Lesser General public # License along and this library; If not, write to the free Software # Foundation, INC, Wuyi Franklin St, Fifth Floor, Boston, MA 02110-1301 # USA TITLE = "CSS accordion" DESCRIPTION = "" "A Simple accordion Demo written usingCSS transitions and multiple backgrounds. "" "Import gi gi.require_version (' Gtk ', ' 3.0 ') from gi.repository import GTK, Gio class Cssaccordionapp:def __ini T__ (self): window = Gtk.window () window.set_title (' CSS accordion ') window.set_default_size (600, 30 0) Window.set_border_width (window.connect) (' Destroy ', gtk.main_quit) Hbox = Gtk.box (homogeneou S=false, spacing=2, Orientation=gtk.orientation.horizontal) hbox.set_halign (Gtk.Align.CENTE R) hbox.set_valign (Gtk.Align.CENTER) Window.add (Hbox) for label in ("This", ' is ', ' A ', ' CSS ', ' Ac Cordion ', ':-) '): Hbox.add (Gtk.button (label=label)) bytes = Gio.resources_lookup_data ("/css/css_accor Dion.css ", 0) Provider = Gtk.cssprovider () provider.load_from_data (Bytes.get_data ()) Self.apply_c SS (window, provider) Window.show_all () 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): WIDG Et.forall (Self.apply_css, provider) def main (): Cssaccordionapp () Gtk.main () if __name__ = = ' __main__ ': IM Port OS 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) gio.resources_register (Resource) Main ()

Css_accordion.css

@import url ("Resource://css/css_reset.css");
    * {transition-property:color, background-color, Border-color, background-image, padding, border-width; transition-duration:500ms;
    /* Transition time 500ms*/Font-family:sans, Arial, Helvetica; font-size:20px; /* Set font and size//} window {/* set window background/background:linear-gradient (153deg, #151515, #151515 5px, Transparent 5p x) 0 0, Linear-gradient (333deg, #151515, #151515 5px, transparent 5px) 10px 5px, Linear-gradient (153deg, #222, #22 2 5px, transparent 5px) 0 5px, Linear-gradient (333deg, #222, #222 5px, transparent 5px) 10px 10px, linear-gradient (90deg, #1b1b1b, #1b1b1b 10px, Transparent 10px), Linear-gradient (#1d1d1d, #1d1d1d 25%, #1a1a1a 25%, #1a1a1a 50%, Tran
    Sparent 50%, Transparent 75%, #242424 75%, #242424);
    Background-color: #131313;
background-size:20px 20px; button {/* Set button Default Style * * Color:black/* Text color/background-color: #bbb/* background color/border-style:solid; /* Border Style, solid */border-width:2px 0 2px 2px; /* Border Width * * Border-color: #333; /* Border color */padding:12px 4px;

/* Text and button spacing/* * Set the first button to the upper left and lower left corner fillet size * * Button:first-child {border-radius:10px 0 0 10px;}
    /* Set the last button to the right and lower right corner fillet size * * Button:last-child {border-radius:0 10px 10px 0;
border-width:2px;
    * * Mouse hover increase the left and right space between the text and button, change the background color * * Button:hover {padding:12px 48px;
Background-color: #4870bc;

Button *:hover {color:white}
 /* Click on the button background color/button:hover:active, button:active {background-color: #993401;}

Css_reset.css
Clears all CSS properties

/* @import This colorsheet to get the default values for every property.
 * This is useful when writing special CSS tests which should not being * inluenced by themes-not even the default ones.
 * Keep in mind that the output would be very ugly and don't look like * anything GTK.
 * Also, when adding new style properties, please add them here.
  * * {color:inherit;
  Font-size:inherit;
  background-color:initial;
  Font-family:inherit;
  Font-style:inherit;
  Font-variant:inherit;
  Font-weight:inherit;
  Text-shadow:inherit;
  -gtk-icon-shadow:inherit;
  box-shadow:initial;
  margin-top:initial;
  margin-left:initial;
  margin-bottom:initial;
  margin-right:initial;
  padding-top:initial;
  padding-left:initial;
  padding-bottom:initial;
  padding-right:initial;
  border-top-style:initial;
  border-top-width:initial;
  border-left-style:initial;
  border-left-width:initial;
  border-bottom-style:initial;
  border-bottom-width:initial; Border-right-style:iniTial
  border-right-width:initial;
  border-top-left-radius:initial;
  border-top-right-radius:initial;
  border-bottom-right-radius:initial;
  border-bottom-left-radius:initial;
  outline-style:initial;
  outline-width:initial;
  outline-offset:initial;
  background-clip:initial;
  background-origin:initial;
  background-size:initial;
  background-position:initial;
  border-top-color:initial;
  border-right-color:initial;
  border-bottom-color:initial;
  border-left-color:initial;
  outline-color:initial;
  background-repeat:initial;
  background-image:initial;
  border-image-source:initial;
  border-image-repeat:initial;
  border-image-slice:initial;
  border-image-width:initial;
  transition-property:initial;
  transition-duration:initial;
  transition-timing-function:initial;
  transition-delay:initial;
  engine:initial;

  -gtk-key-bindings:initial;
  -gtkwidget-focus-line-width:0;
  -gtkwidget-focus-padding:0;
-gtknotebook-initial-gap:0;
 }

Code resolution:
Load resource file First

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)
    Gio.resources_register (Resource)

Create a 6 button

For label in ("This", ' is ', ' A ', ' CSS ', ' accordion ', ':-) '):
            hbox.add (Gtk.button (Label=label))

Find a Style file

bytes = Gio.resources_lookup_data ("/css/css_accordion.css", 0)

Creating Gtk.cssprovider, loading CSS style files

Provider = Gtk.cssprovider ()
Provider.load_from_data (Bytes.get_data ())

Apply a style to all parts where a Widget.forall () method is used, and if the widget is a container, continue to invoke the Apply_css method on the child part

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)

Code Download Address: http://download.csdn.net/detail/a87b01c14/9594728