globalforest/kivymd/uix/behaviors/focus_behavior.py

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2020-10-14 00:19:43 -04:00
"""
Behaviors/Focus
===============
.. rubric:: Changing the background color when the mouse is on the widget.
To apply focus behavior, you must create a new class that is inherited from the
widget to which you apply the behavior and from the :class:`FocusBehavior` class.
Usage
-----
.. code-block:: python
from kivy.lang import Builder
from kivymd.app import MDApp
from kivymd.uix.behaviors import RectangularElevationBehavior, FocusBehavior
from kivymd.uix.boxlayout import MDBoxLayout
KV = '''
MDScreen:
md_bg_color: 1, 1, 1, 1
FocusWidget:
size_hint: .5, .3
pos_hint: {"center_x": .5, "center_y": .5}
md_bg_color: app.theme_cls.bg_light
MDLabel:
text: "Label"
theme_text_color: "Primary"
pos_hint: {"center_y": .5}
halign: "center"
'''
class FocusWidget(MDBoxLayout, RectangularElevationBehavior, FocusBehavior):
pass
class Test(MDApp):
def build(self):
self.theme_cls.theme_style = "Dark"
return Builder.load_string(KV)
Test().run()
.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/focus-widget.gif
:align: center
Color change at focus/defocus
.. code-block:: kv
FocusWidget:
focus_color: 1, 0, 1, 1
unfocus_color: 0, 0, 1, 1
.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/focus-defocus-color.gif
:align: center
"""
__all__ = ("FocusBehavior",)
from kivy.app import App
from kivy.properties import BooleanProperty, ListProperty
from kivy.uix.behaviors import ButtonBehavior
from kivymd.uix.behaviors import HoverBehavior
class FocusBehavior(HoverBehavior, ButtonBehavior):
focus_behavior = BooleanProperty(True)
"""
Using focus when hovering over a widget.
:attr:`focus_behavior` is a :class:`~kivy.properties.BooleanProperty`
and defaults to `False`.
"""
focus_color = ListProperty()
"""
The color of the widget when the mouse enters the bbox of the widget.
:attr:`focus_color` is a :class:`~kivy.properties.ListProperty`
and defaults to `[]`.
"""
unfocus_color = ListProperty()
"""
The color of the widget when the mouse exits the bbox widget.
:attr:`unfocus_color` is a :class:`~kivy.properties.ListProperty`
and defaults to `[]`.
"""
def on_enter(self):
"""Called when mouse enter the bbox of the widget."""
if hasattr(self, "md_bg_color") and self.focus_behavior:
if hasattr(self, "theme_cls") and not self.focus_color:
self.md_bg_color = self.theme_cls.bg_normal
else:
if not self.focus_color:
self.md_bg_color = App.get_running_app().theme_cls.bg_normal
else:
self.md_bg_color = self.focus_color
def on_leave(self):
"""Called when the mouse exit the widget."""
if hasattr(self, "md_bg_color") and self.focus_behavior:
if hasattr(self, "theme_cls") and not self.unfocus_color:
self.md_bg_color = self.theme_cls.bg_light
else:
if not self.unfocus_color:
self.md_bg_color = App.get_running_app().theme_cls.bg_light
else:
self.md_bg_color = self.unfocus_color