101 lines
2.4 KiB
Python
101 lines
2.4 KiB
Python
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"""
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Behaviors/Touch
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===============
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.. rubric:: Provides easy access to events.
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The following events are available:
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- on_long_touch
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- on_double_tap
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- on_triple_tap
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Usage
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-----
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.. code-block:: python
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from kivy.lang import Builder
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from kivymd.app import MDApp
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from kivymd.uix.behaviors import TouchBehavior
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from kivymd.uix.button import MDRaisedButton
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KV = '''
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Screen:
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MyButton:
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text: "PRESS ME"
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pos_hint: {"center_x": .5, "center_y": .5}
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'''
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class MyButton(MDRaisedButton, TouchBehavior):
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def on_long_touch(self, *args):
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print("<on_long_touch> event")
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def on_double_tap(self, *args):
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print("<on_double_tap> event")
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def on_triple_tap(self, *args):
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print("<on_triple_tap> event")
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class MainApp(MDApp):
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def build(self):
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return Builder.load_string(KV)
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MainApp().run()
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"""
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__all__ = ("TouchBehavior",)
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from functools import partial
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from kivy.clock import Clock
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from kivy.properties import NumericProperty
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class TouchBehavior:
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duration_long_touch = NumericProperty(0.4)
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"""
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Time for a long touch.
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:attr:`duration_long_touch` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `0.4`.
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"""
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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self.bind(
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on_touch_down=self.create_clock, on_touch_up=self.delete_clock
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)
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def create_clock(self, widget, touch, *args):
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if self.collide_point(touch.x, touch.y):
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callback = partial(self.on_long_touch, touch)
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Clock.schedule_once(callback, self.duration_long_touch)
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touch.ud["event"] = callback
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def delete_clock(self, widget, touch, *args):
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if self.collide_point(touch.x, touch.y):
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try:
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Clock.unschedule(touch.ud["event"])
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except KeyError:
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pass
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if touch.is_double_tap:
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self.on_double_tap(touch, *args)
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if touch.is_triple_tap:
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self.on_triple_tap(touch, *args)
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def on_long_touch(self, touch, *args):
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"""Called when the widget is pressed for a long time."""
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def on_double_tap(self, touch, *args):
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"""Called by double clicking on the widget."""
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def on_triple_tap(self, touch, *args):
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"""Called by triple clicking on the widget."""
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