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Layout

Layouts are used to calculate and assign widget positions.

The Layout class itself cannot be used directly. You should use one of the following layout classes:

Understanding the size_hint Property in Widget

The size_hint is a tuple of values used by layouts to manage the sizes of their children. It indicates the size relative to the layout’s size instead of an absolute size (in pixels/points/cm/etc). The format is:

widget.size_hint = (width_percent, height_percent)

The percent is specified as a floating point number in the range 0-1. For example, 0.5 is 50%, 1 is 100%.

If you want a widget’s width to be half of the parent’s width and the height to be identical to the parent’s height, you would do:

widget.size_hint = (0.5, 1.0)

If you don’t want to use a size_hint for either the width or height, set the value to None. For example, to make a widget that is 250px wide and 30% of the parent’s height, do:

widget.size_hint = (None, 0.3)
widget.width = 250

Being Kivy properties, these can also be set via constructor arguments:

widget = Widget(size_hint=(None, 0.3), width=250)

Changed in version 1.4.1: The reposition_child internal method (made public by mistake) has been removed.

class kivy.uix.layout.Layout(**kwargs)[source]

Bases: kivy.uix.widget.Widget

Layout interface class, used to implement every layout. See module documentation for more information.

do_layout(*largs)[source]

This function is called when a layout is called by a trigger. If you are writing a new Layout subclass, don’t call this function directly but use _trigger_layout() instead.

The function is by default called before the next frame, therefore the layout isn’t updated immediately. Anything depending on the positions of e.g. children should be scheduled for the next frame.

New in version 1.0.8.