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135 lines
3.7 KiB
Python
135 lines
3.7 KiB
Python
"""
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Behaviors/Focus
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===============
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.. rubric:: Changing the background color when the mouse is on the widget.
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To apply focus 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 :class:`FocusBehavior` class.
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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 RectangularElevationBehavior, FocusBehavior
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from kivymd.uix.boxlayout import MDBoxLayout
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KV = '''
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MDScreen:
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md_bg_color: 1, 1, 1, 1
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FocusWidget:
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size_hint: .5, .3
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pos_hint: {"center_x": .5, "center_y": .5}
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md_bg_color: app.theme_cls.bg_light
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MDLabel:
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text: "Label"
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theme_text_color: "Primary"
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pos_hint: {"center_y": .5}
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halign: "center"
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'''
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class FocusWidget(MDBoxLayout, RectangularElevationBehavior, FocusBehavior):
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pass
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class Test(MDApp):
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def build(self):
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self.theme_cls.theme_style = "Dark"
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return Builder.load_string(KV)
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Test().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/focus-widget.gif
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:align: center
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Color change at focus/defocus
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.. code-block:: kv
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FocusWidget:
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focus_color: 1, 0, 1, 1
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unfocus_color: 0, 0, 1, 1
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/focus-defocus-color.gif
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:align: center
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"""
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__all__ = ("FocusBehavior",)
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from kivy.app import App
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from kivy.properties import BooleanProperty, ColorProperty
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from kivy.uix.behaviors import ButtonBehavior
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from kivymd.uix.behaviors import HoverBehavior
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class FocusBehavior(HoverBehavior, ButtonBehavior):
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focus_behavior = BooleanProperty(True)
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"""
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Using focus when hovering over a widget.
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:attr:`focus_behavior` is a :class:`~kivy.properties.BooleanProperty`
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and defaults to `False`.
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"""
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focus_color = ColorProperty(None)
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"""
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The color of the widget when the mouse enters the bbox of the widget.
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:attr:`focus_color` is a :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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unfocus_color = ColorProperty(None)
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"""
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The color of the widget when the mouse exits the bbox widget.
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:attr:`unfocus_color` is a :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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def on_enter(self):
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"""Called when mouse enter the bbox of the widget."""
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if (
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hasattr(self, "md_bg_color") or hasattr(self, "bg_color")
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) and self.focus_behavior:
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if hasattr(self, "theme_cls") and not self.focus_color:
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color = self.theme_cls.bg_normal
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else:
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if not self.focus_color:
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color = App.get_running_app().theme_cls.bg_normal
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else:
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color = self.focus_color
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self._set_bg_color(color)
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def on_leave(self):
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"""Called when the mouse exit the widget."""
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if (
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hasattr(self, "md_bg_color") or hasattr(self, "bg_color")
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) and self.focus_behavior:
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if hasattr(self, "theme_cls") and not self.unfocus_color:
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color = self.theme_cls.bg_light
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else:
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if not self.unfocus_color:
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color = App.get_running_app().theme_cls.bg_light
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else:
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color = self.unfocus_color
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self._set_bg_color(color)
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def _set_bg_color(self, color):
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if hasattr(self, "md_bg_color"):
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self.md_bg_color = color
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elif hasattr(self, "bg_color"):
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self.bg_color = color
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