mirror of
https://github.com/liberatedsystems/openCom-Companion.git
synced 2024-11-29 08:40:36 +01:00
58 lines
1.9 KiB
Markdown
58 lines
1.9 KiB
Markdown
|
RouletteScrollEffect
|
||
|
|
===================
|
||
|
|
|
||
|
|
This is a subclass of `kivy.effects.ScrollEffect` that simulates the
|
||
|
|
motion of a roulette, or a notched wheel (think Wheel of Fortune). It is
|
||
|
|
primarily designed for emulating the effect of the iOS and android date pickers.
|
||
|
|
|
||
|
|
Usage
|
||
|
|
-----
|
||
|
|
|
||
|
|
Here's an example of using `RouletteScrollEffect` for a `kivy.uix.scrollview.ScrollView`:
|
||
|
|
|
||
|
|
```python
|
||
|
|
from kivy.uix.gridlayout import GridLayout
|
||
|
|
from kivy.uix.button import Button
|
||
|
|
from kivy.uix.scrollview import ScrollView
|
||
|
|
|
||
|
|
# Preparing a `GridLayout` inside a `ScrollView`.
|
||
|
|
layout = GridLayout(cols=1, padding=10, size_hint=(None, None), width=500)
|
||
|
|
layout.bind(minimum_height=layout.setter('height'))
|
||
|
|
|
||
|
|
for i in range(30):
|
||
|
|
btn = Button(text=str(i), size=(480, 40), size_hint=(None, None))
|
||
|
|
layout.add_widget(btn)
|
||
|
|
|
||
|
|
root = ScrollView(
|
||
|
|
size_hint=(None, None),
|
||
|
|
size=(500, 320),
|
||
|
|
pos_hint={'center_x': .5, 'center_y': .5},
|
||
|
|
do_scroll_x=False,
|
||
|
|
)
|
||
|
|
root.add_widget(layout)
|
||
|
|
|
||
|
|
# Preparation complete. Now add the new scroll effect.
|
||
|
|
root.effect_y = RouletteScrollEffect(anchor=20, interval=40)
|
||
|
|
runTouchApp(root)
|
||
|
|
```
|
||
|
|
|
||
|
|
Here the `ScrollView` scrolls through a series of buttons with height `40`. We then attached a `RouletteScrollEffect` with interval 40,
|
||
|
|
corresponding to the button heights. This allows the scrolling to stop at
|
||
|
|
the same offset no matter where it stops. The `RouletteScrollEffect.anchor`
|
||
|
|
adjusts this offset.
|
||
|
|
|
||
|
|
Customizations
|
||
|
|
--------------
|
||
|
|
|
||
|
|
Other settings that can be played with include:
|
||
|
|
|
||
|
|
- `RouletteScrollEffect.pull_duration`
|
||
|
|
- `RouletteScrollEffect.coasting_alpha`
|
||
|
|
- `RouletteScrollEffect.pull_back_velocity`
|
||
|
|
- `RouletteScrollEffect.terminal_velocity`
|
||
|
|
|
||
|
|
See their module documentations for details.
|
||
|
|
|
||
|
|
`RouletteScrollEffect` has one event ``on_coasted_to_stop`` that
|
||
|
|
is fired when the roulette stops, "making a selection". It can be listened to
|
||
|
|
for handling or cleaning up choice making.
|