Accordion

New in version 1.0.8.

Warning

This widget is still experimental, and its API is subject to change in a future version.

_images/accordion.jpg

The Accordion widget is a form of menu where the options are stacked either vertically or horizontally, and the item in focus/when touched opens up displaying his content.

The Accordion will contain one or many AccordionItem instances, that will contain one root content widget. You’ll have a Tree like this:

  • Accordion
    • AccordionItem
      • YourContent
    • AccordionItem
      • BoxLayout
        • Another user content 1
        • Another user content 2
    • AccordionItem
      • Another user content

The current implementation divides the AccordionItem into two parts:

  1. One container for the title bar
  2. One container for the content

The title bar is made from a Kv template. We’ll see how to create a new template to customize the design of the title bar.

Warning

If you see message like:

[WARNING] [Accordion] not have enough space for displaying all children
[WARNING] [Accordion] need 440px, got 100px
[WARNING] [Accordion] layout aborted.

That means you have too many children, and there is no more space to display any content. This is “normal”, and nothing will be done. Try to increase the space for the accordion, and reduce the number of children. You can also reduce the Accordion.min_space.

Simple example

from kivy.uix.accordion import Accordion, AccordionItem
from kivy.uix.label import Label
from kivy.app import App

class AccordionApp(App):
    def build(self):
        root = Accordion()
        for x in xrange(5):
            item = AccordionItem(title='Title %d' % x)
            item.add_widget(Label(text='Very big content\n' * 10))
            root.add_widget(item)
        return root

if __name__ == '__main__':
    AccordionApp().run()

Customize the accordion

You can increase the default size of the title bar:

root = Accordion(min_space=60)

Or change the orientation to vertical:

root = Accordion(orientation='vertical')

AccordionItem is more configurable, and you can set your own title background when the item is collapsed or opened:

item = AccordionItem(background_normal='image_when_collapsed.png',
    background_selected='image_when_selected.png')
class kivy.uix.accordion.Accordion(**kwargs)

Bases: kivy.uix.widget.Widget

Accordion class. See module documentation for more information.

anim_duration

Duration of the animation in seconds, when a new accordion item is selected.

anim_duration is a NumericProperty, default to .25 (250ms)

anim_func

Easing function to use for the animation. Check kivy.animation.AnimationTransition for more information about available animation functions.

anim_func is a ObjectProperty, default to ‘out_expo’. You can set a string or a function to use as an easing function.

min_space

Minimum space to use for title of each item. This value is automatically set on each children, each time the layout happens.

min_space is a NumericProperty, default to 44 (px).

orientation

Orientation of the layout.

orientation is an OptionProperty, default to ‘horizontal’. Can take a value of ‘vertical’ or ‘horizontal’.

class kivy.uix.accordion.AccordionItem(**kwargs)

Bases: kivy.uix.floatlayout.FloatLayout

AccordionItem class, that must be used in conjunction with Accordion class. See module documentation for more information.

accordion

Instance of the Accordion that the item belongs to.

accordion is an ObjectProperty, default to None.

background_normal

Background image of the accordion item used for default graphical representation, when the item is collapsed.

background_normal is an StringProperty, default to ‘atlas://data/images/defaulttheme/button’

background_selected

Background image of the accordion item used for default graphical representation, when the item is selected (not collapsed).

background_normal is an StringProperty, default to ‘atlas://data/images/defaulttheme/button_pressed’

collapse

Boolean to indicate if the current item is collapsed or not.

collapse is a BooleanProperty, default to True

collapse_alpha

Value between 0 and 1 to indicate how much the item is collasped (1) or selected (0). It’s mostly used for animation.

collapse_alpha is a NumericProperty, default to 1.

container

(internal) Property that will be set to the container of children, inside the AccordionItem representation.

container_title

(internal) Property that will be set to the container of title, inside the AccordionItem representation.

content_size

(internal) Set by the Accordion to the size allocated for the content.

min_space

Link to the Accordion.min_space property.

orientation

Link to the Accordion.orientation property.

title

Title string of the item. The title might be used in conjuction with the AccordionItemTitle template. If you are using a custom template, you can use that property as a text entry, or not. By default, it’s used for the title text. See title_template and the example below.

title is a StringProperty, default to ‘’

title_args

Default arguments that will be pass to the kivy.lang.Builder.template() method.

title_args is a DictProperty, default to {}

title_template

Template to use for creating the title part of the accordion item. The default template is a simple Label, not customizable (except the text) that supports vertical and horizontal orientation, and different backgrounds for collapse and selected mode.

It’s better to create and use your own template, if the default template does not suffice.

title is a StringProperty, default to ‘AccordionItemTitle’. The current default template lives in the kivy/data/style.kv file.

Here is the code if you want to build your own template:

[AccordionItemTitle@Label]:
    text: ctx.title
    canvas.before:
        Color:
            rgb: 1, 1, 1
        BorderImage:
            source:
                ctx.item.background_normal \
                if ctx.item.collapse \
                else ctx.item.background_selected
            pos: self.pos
            size: self.size
        PushMatrix
        Translate:
            xy: self.center_x, self.center_y
        Rotate:
            angle: 90 if ctx.item.orientation == 'horizontal' else 0
            axis: 0, 0, 1
        Translate:
            xy: -self.center_x, -self.center_y
    canvas.after:
        PopMatrix
class kivy.uix.accordion.AccordionException

Bases: exceptions.Exception

AccordionException class.