mirror of
https://github.com/liberatedsystems/Sideband_CE.git
synced 2024-09-03 04:13:27 +02:00
490 lines
14 KiB
Python
490 lines
14 KiB
Python
"""
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Components/SliverAppbar
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=======================
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.. versionadded:: 1.0.0
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.. rubric:: MDSliverAppbar is a Material Design widget in KivyMD which gives
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scrollable or collapsible
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`MDTopAppBar <https://kivymd.readthedocs.io/en/latest/components/toolbar/>`_
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.. note:: This widget is a modification of the
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`silverappbar.py <https://github.com/kivymd-extensions/akivymd/blob/main/kivymd_extensions/akivymd/uix/silverappbar.py>`_ module.
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Usage
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-----
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.. code-block:: kv
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MDScreen:
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MDSliverAppbar:
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MDSliverAppbarHeader:
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# Custom content.
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...
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# Custom list.
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MDSliverAppbarContent:
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/sliver-app-bar-usage.png
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:align: center
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Example
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-------
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.. code-block:: python
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from kivy.lang.builder import Builder
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from kivymd.uix.card import MDCard
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from kivymd.uix.behaviors import RoundedRectangularElevationBehavior
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KV = '''
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<CardItem>
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size_hint_y: None
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height: "86dp"
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padding: "4dp"
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radius: 12
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elevation: 4
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FitImage:
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source: "avatar.jpg"
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radius: root.radius
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size_hint_x: None
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width: root.height
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MDBoxLayout:
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orientation: "vertical"
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adaptive_height: True
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spacing: "6dp"
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padding: "12dp", 0, 0, 0
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pos_hint: {"center_y": .5}
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MDLabel:
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text: "Title text"
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font_style: "H5"
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bold: True
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adaptive_height: True
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MDLabel:
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text: "Subtitle text"
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theme_text_color: "Hint"
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adaptive_height: True
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MDScreen:
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MDSliverAppbar:
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background_color: "2d4a50"
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MDSliverAppbarHeader:
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MDRelativeLayout:
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FitImage:
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source: "bg.jpg"
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MDSliverAppbarContent:
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id: content
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orientation: "vertical"
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padding: "12dp"
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spacing: "12dp"
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adaptive_height: True
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'''
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class CardItem(MDCard, RoundedRectangularElevationBehavior):
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pass
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class Example(MDApp):
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def build(self):
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return Builder.load_string(KV)
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def on_start(self):
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for x in range(10):
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self.root.ids.content.add_widget(CardItem())
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Example().run()
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"""
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__all__ = ("MDSliverAppbar", "MDSliverAppbarHeader", "MDSliverAppbarContent")
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import os
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from typing import Union
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from kivy.clock import Clock
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from kivy.core.window import Window
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from kivy.lang.builder import Builder
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from kivy.properties import (
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BooleanProperty,
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ColorProperty,
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NumericProperty,
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ObjectProperty,
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VariableListProperty,
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)
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from kivymd import uix_path
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from kivymd.theming import ThemableBehavior
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from kivymd.uix.boxlayout import MDBoxLayout
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from kivymd.uix.toolbar import MDTopAppBar
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with open(
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os.path.join(uix_path, "sliverappbar", "sliverappbar.kv"), encoding="utf-8"
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) as kv_file:
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Builder.load_string(kv_file.read())
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class MDSliverAppbarException(Exception):
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pass
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class MDSliverAppbarContent(ThemableBehavior, MDBoxLayout):
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"""Implements a box for a scrollable list of custom items."""
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md_bg_color = ColorProperty([0, 0, 0, 0])
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"""
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See :attr:`~kivymd.uix.sliverappbar.sliverappbar.MDSliverAppbar.background_color`.
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:attr:`md_bg_color` is an :class:`~kivy.properties.ColorProperty`
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and defaults to `[0, 0, 0, 0]`.
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"""
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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Clock.schedule_once(self.set_bg_color)
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def set_bg_color(self, interval: Union[int, float]) -> None:
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if self.md_bg_color == [0, 0, 0, 0]:
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self.md_bg_color = self.theme_cls.bg_normal
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class MDSliverAppbarHeader(MDBoxLayout):
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pass
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class MDSliverAppbar(ThemableBehavior, MDBoxLayout):
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"""
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MDSliverAppbar class.
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See module documentation for more information.
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:Events:
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:attr:`on_scroll_content`
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Called when the list of custom content is being scrolled.
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"""
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toolbar_cls = ObjectProperty()
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"""
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Must be an object of the :class:`~kivymd.uix.toolbar.toolbar.MDTopAppBar' class.
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See :class:`~kivymd.uix.toolbar.toolbar.MDTopAppBar` class documentation
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for more information.
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By default, MDSliverAppbar widget uses the MDTopAppBar class with no
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parameters.
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.. code-block:: python
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from kivy.lang.builder import Builder
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from kivymd.uix.card import MDCard
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from kivymd.uix.toolbar import MDTopAppBar
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from kivymd.uix.behaviors import RoundedRectangularElevationBehavior
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KV = '''
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#:import SliverToolbar __main__.SliverToolbar
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<CardItem>
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size_hint_y: None
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height: "86dp"
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padding: "4dp"
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radius: 12
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elevation: 4
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FitImage:
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source: "avatar.jpg"
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radius: root.radius
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size_hint_x: None
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width: root.height
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MDBoxLayout:
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orientation: "vertical"
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adaptive_height: True
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spacing: "6dp"
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padding: "12dp", 0, 0, 0
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pos_hint: {"center_y": .5}
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MDLabel:
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text: "Title text"
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font_style: "H5"
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bold: True
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adaptive_height: True
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MDLabel:
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text: "Subtitle text"
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theme_text_color: "Hint"
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adaptive_height: True
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MDScreen:
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MDSliverAppbar:
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background_color: "2d4a50"
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toolbar_cls: SliverToolbar()
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MDSliverAppbarHeader:
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MDRelativeLayout:
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FitImage:
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source: "bg.jpg"
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MDSliverAppbarContent:
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id: content
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orientation: "vertical"
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padding: "12dp"
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spacing: "12dp"
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adaptive_height: True
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'''
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class CardItem(MDCard, RoundedRectangularElevationBehavior):
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pass
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class SliverToolbar(MDTopAppBar):
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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self.type_height = "medium"
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self.headline_text = "Headline medium"
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self.left_action_items = [["arrow-left", lambda x: x]]
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self.right_action_items = [
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["attachment", lambda x: x],
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["calendar", lambda x: x],
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["dots-vertical", lambda x: x],
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]
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class Example(MDApp):
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def build(self):
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self.theme_cls.material_style = "M3"
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return Builder.load_string(KV)
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def on_start(self):
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for x in range(10):
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self.root.ids.content.add_widget(CardItem())
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Example().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/sliver-app-bar-toolbar-cls.gif
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:align: center
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:attr:`toolbar_cls` is an :class:`~kivy.properties.ObjectProperty`
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and defaults to `None`.
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"""
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background_color = ColorProperty(None)
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"""
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Background color of toolbar in (r, g, b, a) format.
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.. code-block:: kv
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MDSliverAppbar:
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background_color: "2d4a50"
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/sliver-app-bar-background-color.png
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:align: center
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:attr:`background_color` is an :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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max_height = NumericProperty(Window.height / 2)
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"""
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Distance from top of screen to start of custom list content.
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.. code-block:: kv
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MDSliverAppbar:
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max_height: "200dp"
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/sliver-app-bar-max-height.png
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:align: center
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:attr:`max_height` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `Window.height / 2`.
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"""
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hide_toolbar = BooleanProperty(True)
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"""
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Whether to hide the toolbar when scrolling through a list
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of custom content.
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.. code-block:: kv
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MDSliverAppbar:
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hide_toolbar: False
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/sliver-app-bar-hide-toolbar.gif
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:align: center
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MDSliverAppbar:
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hide_toolbar: True
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/sliver-app-bar-hide-toolbar-true.gif
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:align: center
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:attr:`hide_toolbar` is an :class:`~kivy.properties.BooleanProperty`
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and defaults to `True`.
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"""
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radius = VariableListProperty([20], length=4)
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"""
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Box radius for custom item list.
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.. code-block:: kv
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MDSliverAppbar:
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radius: 20
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/sliver-app-bar-radius.png
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:align: center
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:attr:`radius` is an :class:`~kivy.properties.VariableListProperty`
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and defaults to `[20]`.
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"""
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max_opacity = NumericProperty(1)
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"""
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Maximum background transparency value for the
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:class:`~kivymd.uix.sliverappbar.sliverappbar.MDSliverAppbarHeader` class.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/sliver-app-bar-max-opacity.gif
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:align: center
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.. code-block:: kv
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MDSliverAppbar:
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max_opacity: .5
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/sliver-app-bar-max-opacity-05.gif
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:align: center
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:attr:`max_opacity` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `1`.
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"""
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_opacity = NumericProperty()
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_scroll_was_moving = BooleanProperty(False)
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_last_scroll_y_pos = 0.0
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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self.register_event_type("on_scroll_content")
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def on_scroll_content(
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self,
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instance_sliverappbar: object = None,
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value: float = 1.0,
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direction: str = "up",
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):
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"""
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Called when the list of custom content is being scrolled.
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:param instance_sliverappbar: :class:`~MDSliverAppbar`
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:param value: see :attr:`~kivy.uix.scrollview.ScrollView.scroll_y`
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:param direction: scroll direction: 'up/down'
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"""
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def on_background_color(
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self, instance_sliver_appbar, color_value: list
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) -> None:
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if self.toolbar_cls:
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self.toolbar_cls.md_bg_color = color_value
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def on_toolbar_cls(
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self, instance_sliver_appbar, instance_toolbar_cls: MDTopAppBar
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) -> None:
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"""Called when a value is set to the :attr:`toolbar_cls` parameter."""
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# If an MDTopAppBar object is already in use, delete it
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# before adding a new MDTopAppBar object.
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for widget in self.ids.float_box.children:
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if issubclass(widget.__class__, MDTopAppBar):
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self.ids.float_box.remove_widget(widget)
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# Adding a custom MDTopAppBar object.
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if issubclass(instance_toolbar_cls.__class__, MDTopAppBar):
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instance_toolbar_cls.pos_hint = {"top": 1}
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self.ids.float_box.add_widget(instance_toolbar_cls)
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else:
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raise MDSliverAppbarException(
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"The `toolbar_cls` parameter must be an object of the "
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"`kivymd.uix.toolbar.MDTopAppBar class`"
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)
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def on_vbar(self) -> None:
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if not self.background_color:
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self.background_color = self.theme_cls.primary_color
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if not self.toolbar_cls:
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self.toolbar_cls = self.get_default_toolbar()
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scroll_box = self.ids.scroll_box
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vbar = self.ids.scroll.vbar
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toolbar_percent = (self.toolbar_cls.height / scroll_box.height) * 100
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current_percent = (vbar[0] + vbar[1]) * 100
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percent_min = (
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1 - self.max_height / scroll_box.height
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) * 100 + toolbar_percent
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if self._scroll_was_moving:
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direction = self._get_direction_swipe(self.ids.scroll.scroll_y)
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self._last_scroll_y_pos = self.ids.scroll.scroll_y
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self.dispatch(
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"on_scroll_content", self.ids.scroll.scroll_y, direction
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)
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if self.hide_toolbar:
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if percent_min <= current_percent:
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opacity = (current_percent - percent_min) / (100 - percent_min)
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self._opacity = self.max_opacity * (1 - opacity)
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self.background_color = self.background_color[0:3] + [
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1 - opacity
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]
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self.toolbar_cls._hard_shadow_a = 1 - opacity
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self.toolbar_cls._soft_shadow_a = 1 - opacity
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else:
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self.background_color = self.background_color[0:3] + [1]
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def get_default_toolbar(self) -> MDTopAppBar:
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"""Called if no value is passed for the toolbar_cls attribute."""
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return MDTopAppBar(
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pos_hint={"top": 1}, md_bg_color=self.background_color
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)
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def add_widget(self, widget, index=0, canvas=None):
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if issubclass(widget.__class__, MDSliverAppbarContent):
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Clock.schedule_once(lambda x: self._set_radius(widget))
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self.ids.scroll_box.add_widget(widget)
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elif issubclass(widget.__class__, MDSliverAppbarHeader):
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self.ids.header.add_widget(widget)
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else:
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super().add_widget(widget, index=index, canvas=canvas)
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def _set_radius(self, instance: MDSliverAppbarContent) -> None:
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instance.radius = self.radius
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def _get_direction_swipe(self, current_percent: float) -> str:
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if self._last_scroll_y_pos > current_percent:
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direction = "up"
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else:
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direction = "down"
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return direction
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