U Pe@sPdZdZddlmZddlmZddlmZddlmZm Z GdddeZ d S) a7 Scroll effect ============= .. versionadded:: 1.7.0 Based on the :class:`~kivy.effects.kinetic` effect, the :class:`ScrollEffect` will limit the movement to bounds determined by its :attr:`~ScrollEffect.min` and :attr:`~ScrollEffect.max` properties. If the movement exceeds these bounds, it will calculate the amount of :attr:`~ScrollEffect.overscroll` and try to return to the value of one of the bounds. This is very useful for implementing a scrolling list. We actually use this class as a base effect for our :class:`~kivy.uix.scrollview.ScrollView` widget. ) ScrollEffect)time) KineticEffect)Widget)NumericPropertyObjectPropertycseZdZdZedZedZedZedZedZ e dde dZ edZ ddZd d Zdfd d Zdfd d Zdfdd ZZS)rzKScrollEffect class. See the module documentation for more information. Z20sprNT)Z allownoneZ baseclasscCs2||_d|_|jr.|jdd}t|fg|_dS)zs(internal) Reset the value and the velocity to the `pos`. Mostly used when the bounds are checked. rN)valuevelocityhistoryr)selfposvalr7/tmp/pip-unpacked-wheel-xzebddm3/kivy/effects/scroll.pyresetWs zScrollEffect.resetcGsn|j}|j}||kr||}}|j|kr@|j||_||n*|j|krb|j||_||n|j|_dS)N)minmaxr overscrollrscroll)r argsZ scroll_minZ scroll_maxrrron_valueas       zScrollEffect.on_valuecsd|_d|_tt|||S)NTr) is_manual displacementsuperrstartr rt __class__rrroszScrollEffect.startcs2|jt||jdd7_tt|||S)Nrr )rabsr rrupdaterrrrr"ts zScrollEffect.updatecsNd|_|jt||jdd7_|j|jkrs