142 lines
4 KiB
Python
142 lines
4 KiB
Python
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"""
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Behaviors/Hover
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===============
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.. rubric:: Changing when the mouse is on the widget.
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To apply hover behavior, you must create a new class that is inherited from the
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widget to which you apply the behavior and from the :attr:`HoverBehavior` class.
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In `KV file`:
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.. code-block:: kv
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<HoverItem@MDBoxLayout+ThemableBehavior+HoverBehavior>
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In `python file`:
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.. code-block:: python
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class HoverItem(MDBoxLayout, ThemableBehavior, HoverBehavior):
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'''Custom item implementing hover behavior.'''
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After creating a class, you must define two methods for it:
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:attr:`HoverBehavior.on_enter` and :attr:`HoverBehavior.on_leave`, which will be automatically called
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when the mouse cursor is over the widget and when the mouse cursor goes beyond
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the widget.
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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 HoverBehavior
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from kivymd.uix.boxlayout import MDBoxLayout
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from kivymd.theming import ThemableBehavior
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KV = '''
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Screen
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MDBoxLayout:
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id: box
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pos_hint: {'center_x': .5, 'center_y': .5}
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size_hint: .8, .8
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md_bg_color: app.theme_cls.bg_darkest
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'''
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class HoverItem(MDBoxLayout, ThemableBehavior, HoverBehavior):
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'''Custom item implementing hover behavior.'''
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def on_enter(self, *args):
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'''The method will be called when the mouse cursor
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is within the borders of the current widget.'''
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self.md_bg_color = (1, 1, 1, 1)
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def on_leave(self, *args):
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'''The method will be called when the mouse cursor goes beyond
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the borders of the current widget.'''
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self.md_bg_color = self.theme_cls.bg_darkest
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class Test(MDApp):
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def build(self):
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self.screen = Builder.load_string(KV)
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for i in range(5):
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self.screen.ids.box.add_widget(HoverItem())
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return self.screen
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Test().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/hover-behavior.gif
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:width: 250 px
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:align: center
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"""
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__all__ = ("HoverBehavior",)
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from kivy.core.window import Window
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from kivy.factory import Factory
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from kivy.properties import BooleanProperty, ObjectProperty
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class HoverBehavior(object):
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"""
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:Events:
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:attr:`on_enter`
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Call when mouse enter the bbox of the widget.
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:attr:`on_leave`
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Call when the mouse exit the widget.
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"""
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hovered = BooleanProperty(False)
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"""
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`True`, if the mouse cursor is within the borders of the widget.
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:attr:`hovered` is an :class:`~kivy.properties.BooleanProperty`
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and defaults to `False`.
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"""
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border_point = ObjectProperty(None)
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"""Contains the last relevant point received by the Hoverable.
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This can be used in :attr:`on_enter` or :attr:`on_leave` in order
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to know where was dispatched the event.
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:attr:`border_point` is an :class:`~kivy.properties.ObjectProperty`
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and defaults to `None`.
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"""
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def __init__(self, **kwargs):
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self.register_event_type("on_enter")
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self.register_event_type("on_leave")
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Window.bind(mouse_pos=self.on_mouse_pos)
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super(HoverBehavior, self).__init__(**kwargs)
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def on_mouse_pos(self, *args):
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if not self.get_root_window():
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return # do proceed if I'm not displayed <=> If have no parent
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pos = args[1]
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# Next line to_widget allow to compensate for relative layout
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inside = self.collide_point(*self.to_widget(*pos))
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if self.hovered == inside:
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# We have already done what was needed
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return
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self.border_point = pos
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self.hovered = inside
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if inside:
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self.dispatch("on_enter")
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else:
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self.dispatch("on_leave")
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def on_enter(self):
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"""Call when mouse enter the bbox of the widget."""
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def on_leave(self):
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"""Call when the mouse exit the widget."""
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Factory.register("HoverBehavior", HoverBehavior)
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