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"""Hoverable Behaviour (changing when the mouse is on the widget by O. Poyen. | |
License: LGPL | |
""" | |
__author__ = 'Olivier POYEN' | |
from kivy.properties import BooleanProperty, ObjectProperty | |
from kivy.core.window import Window | |
class HoverBehavior(object): | |
"""Hover behavior. | |
:Events: | |
`on_enter` | |
Fired when mouse enter the bbox of the widget. | |
`on_leave` | |
Fired when the mouse exit the widget | |
""" | |
hovered = BooleanProperty(False) | |
border_point= ObjectProperty(None) | |
'''Contains the last relevant point received by the Hoverable. This can | |
be used in `on_enter` or `on_leave` in order to know where was dispatched the event. | |
''' | |
def __init__(self, **kwargs): | |
self.register_event_type('on_enter') | |
self.register_event_type('on_leave') | |
Window.bind(mouse_pos=self.on_mouse_pos) | |
super(HoverBehavior, self).__init__(**kwargs) | |
def on_mouse_pos(self, *args): | |
if not self.get_root_window(): | |
return # do proceed if I'm not displayed <=> If have no parent | |
pos = args[1] | |
#Next line to_widget allow to compensate for relative layout | |
inside = self.collide_point(*self.to_widget(*pos)) | |
if self.hovered == inside: | |
#We have already done what was needed | |
return | |
self.border_point = pos | |
self.hovered = inside | |
if inside: | |
self.dispatch('on_enter') | |
else: | |
self.dispatch('on_leave') | |
def on_enter(self): | |
pass | |
def on_leave(self): | |
pass | |
from kivy.factory import Factory | |
Factory.register('HoverBehavior', HoverBehavior) | |
if __name__=='__main__': | |
from kivy.uix.floatlayout import FloatLayout | |
from kivy.lang import Builder | |
from kivy.uix.label import Label | |
from kivy.base import runTouchApp | |
class HoverLabel(Label, HoverBehavior): | |
def on_enter(self, *args): | |
print "You are in, through this point", self.border_point | |
def on_leave(self, *args): | |
print "You left through this point", self.border_point | |
Builder.load_string(''' | |
<HoverLabel>: | |
text: "inside" if self.hovered else "outside" | |
pos: 200,200 | |
size_hint: None, None | |
size: 100, 30 | |
canvas.before: | |
Color: | |
rgb: 1,0,0 | |
Rectangle: | |
size: self.size | |
pos: self.pos | |
''') | |
fl = FloatLayout() | |
fl.add_widget(HoverLabel()) | |
runTouchApp(fl) |
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