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533 lines
16 KiB
Python
533 lines
16 KiB
Python
"""
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Components/Backdrop
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===================
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.. seealso::
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`Material Design spec, Backdrop <https://material.io/components/backdrop>`_
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.. rubric:: Skeleton layout for using :class:`~MDBackdrop`:
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop.png
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:align: center
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Usage
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-----
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.. code-block:: kv
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<Root>
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MDBackdrop:
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MDBackdropBackLayer:
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ContentForBackdropBackLayer:
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MDBackdropFrontLayer:
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ContentForBackdropFrontLayer:
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Example
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-------
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.. tabs::
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.. tab:: Declarative KV styles
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.. code-block:: python
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from kivy.lang import Builder
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from kivymd.uix.screen import MDScreen
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from kivymd.app import MDApp
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# Your layouts.
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Builder.load_string(
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'''
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#:import os os
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#:import Window kivy.core.window.Window
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#:import IconLeftWidget kivymd.uix.list.IconLeftWidget
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#:import images_path kivymd.images_path
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<ItemBackdropFrontLayer@TwoLineAvatarListItem>
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icon: "android"
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IconLeftWidget:
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icon: root.icon
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<MyBackdropFrontLayer@ItemBackdropFrontLayer>
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backdrop: None
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text: "Lower the front layer"
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secondary_text: " by 50 %"
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icon: "transfer-down"
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on_press: root.backdrop.open(-Window.height / 2)
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pos_hint: {"top": 1}
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_no_ripple_effect: True
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<MyBackdropBackLayer@Image>
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size_hint: .8, .8
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source: os.path.join(images_path, "logo", "kivymd-icon-512.png")
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pos_hint: {"center_x": .5, "center_y": .6}
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'''
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)
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# Usage example of MDBackdrop.
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Builder.load_string(
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'''
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<ExampleBackdrop>
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MDBackdrop:
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id: backdrop
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left_action_items: [['menu', lambda x: self.open()]]
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title: "Example Backdrop"
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radius_left: "25dp"
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radius_right: "0dp"
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header_text: "Menu:"
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MDBackdropBackLayer:
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MyBackdropBackLayer:
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id: backlayer
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MDBackdropFrontLayer:
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MyBackdropFrontLayer:
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backdrop: backdrop
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'''
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)
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class ExampleBackdrop(MDScreen):
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pass
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class Example(MDApp):
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def build(self):
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self.theme_cls.theme_style = "Dark"
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self.theme_cls.primary_palette = "Orange"
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return ExampleBackdrop()
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Example().run()
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.. tab:: Declarative python styles
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.. code-block:: python
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import os
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from kivy.core.window import Window
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from kivy.uix.image import Image
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from kivymd import images_path
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from kivymd.uix.backdrop import MDBackdrop
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from kivymd.uix.backdrop.backdrop import (
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MDBackdropBackLayer, MDBackdropFrontLayer
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)
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from kivymd.uix.list import TwoLineAvatarListItem, IconLeftWidget
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from kivymd.uix.screen import MDScreen
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from kivymd.app import MDApp
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class Example(MDApp):
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def build(self):
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self.theme_cls.theme_style = "Dark"
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self.theme_cls.primary_palette = "Orange"
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return (
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MDScreen(
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MDBackdrop(
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MDBackdropBackLayer(
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Image(
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size_hint=(0.8, 0.8),
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source=os.path.join(images_path, "logo", "kivymd-icon-512.png"),
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pos_hint={"center_x": 0.5, "center_y": 0.6},
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)
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),
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MDBackdropFrontLayer(
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TwoLineAvatarListItem(
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IconLeftWidget(icon="transfer-down"),
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text="Lower the front layer",
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secondary_text=" by 50 %",
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on_press=self.backdrop_open_by_50_percent,
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pos_hint={"top": 1},
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_no_ripple_effect=True,
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),
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),
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id="backdrop",
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title="Example Backdrop",
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radius_left="25dp",
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radius_right="0dp",
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header_text="Menu:",
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)
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)
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)
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def backdrop_open_by_50_percent(self, *args):
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self.root.ids.backdrop.open(-Window.height / 2)
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Example().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop.gif
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:align: center
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.. Note:: `See full example <https://github.com/kivymd/KivyMD/wiki/Components-Backdrop>`_
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"""
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__all__ = (
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"MDBackdropToolbar",
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"MDBackdropFrontLayer",
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"MDBackdropBackLayer",
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"MDBackdrop",
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)
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import os
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from typing import Union
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from kivy.animation import Animation
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from kivy.clock import Clock
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from kivy.lang import Builder
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from kivy.properties import (
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BooleanProperty,
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ColorProperty,
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ListProperty,
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NumericProperty,
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OptionProperty,
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StringProperty,
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)
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from kivy.uix.boxlayout import BoxLayout
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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.behaviors import FakeRectangularElevationBehavior
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from kivymd.uix.boxlayout import MDBoxLayout
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from kivymd.uix.card import MDCard
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from kivymd.uix.floatlayout import MDFloatLayout
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from kivymd.uix.toolbar.toolbar import ActionTopAppBarButton, MDTopAppBar
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with open(
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os.path.join(uix_path, "backdrop", "backdrop.kv"),
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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 MDBackdrop(MDFloatLayout, ThemableBehavior):
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"""
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:Events:
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:attr:`on_open`
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When the front layer drops.
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:attr:`on_close`
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When the front layer rises.
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"""
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anchor_title = OptionProperty("left", options=["left", "center", "right"])
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"""
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Position toolbar title. Only used with `material_style = 'M3'`
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Available options are: `'left'`, `'center'`, `'right'`.
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.. versionadded:: 1.0.0
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop-anchor-title.png
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:align: center
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:attr:`anchor_title` is an :class:`~kivy.properties.OptionProperty`
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and defaults to `'left'`.
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"""
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padding = ListProperty([0, 0, 0, 0])
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"""
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Padding for contents of the front layer.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop-padding.png
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:align: center
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:attr:`padding` is an :class:`~kivy.properties.ListProperty`
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and defaults to `[0, 0, 0, 0]`.
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"""
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left_action_items = ListProperty()
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"""
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The icons and methods left of the :class:`kivymd.uix.toolbar.MDTopAppBar`
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in back layer. For more information, see the
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:class:`kivymd.uix.toolbar.MDTopAppBar` module
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and :attr:`left_action_items` parameter.
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:attr:`left_action_items` is an :class:`~kivy.properties.ListProperty`
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and defaults to `[]`.
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"""
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right_action_items = ListProperty()
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"""
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Works the same way as :attr:`left_action_items`.
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:attr:`right_action_items` is an :class:`~kivy.properties.ListProperty`
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and defaults to `[]`.
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"""
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title = StringProperty()
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"""
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See the :class:`kivymd.uix.toolbar.MDTopAppBar.title` parameter.
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:attr:`title` is an :class:`~kivy.properties.StringProperty`
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and defaults to `''`.
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"""
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back_layer_color = ColorProperty(None)
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"""
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Background color of back layer.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop-back-layer-color.png
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:align: center
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:attr:`back_layer_color` is an :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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front_layer_color = ColorProperty(None)
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"""
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Background color of front layer.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop-front-layer-color.png
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:align: center
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:attr:`front_layer_color` is an :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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radius_left = NumericProperty("16dp")
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"""
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The value of the rounding radius of the upper left corner
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of the front layer.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop-radius-left.png
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:align: center
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:attr:`radius_left` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `16dp`.
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"""
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radius_right = NumericProperty("16dp")
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"""
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The value of the rounding radius of the upper right corner
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of the front layer.
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:attr:`radius_right` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `16dp`.
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"""
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header = BooleanProperty(True)
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"""
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Whether to use a header above the contents of the front layer.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop-header.png
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:align: center
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:attr:`header` is an :class:`~kivy.properties.BooleanProperty`
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and defaults to `True`.
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"""
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header_text = StringProperty("Header")
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"""
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Text of header.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop-header-text.png
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:align: center
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:attr:`header_text` is an :class:`~kivy.properties.StringProperty`
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and defaults to `'Header'`.
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"""
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close_icon = StringProperty("close")
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"""
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The name of the icon that will be installed on the toolbar
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on the left when opening the front layer.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/backdrop-close-icon.png
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:align: center
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:attr:`close_icon` is an :class:`~kivy.properties.StringProperty`
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and defaults to `'close'`.
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"""
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opening_time = NumericProperty(0.2)
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"""
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The time taken for the panel to slide to the :attr:`state` `'open'`.
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.. versionadded:: 1.0.0
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:attr:`opening_time` is a :class:`~kivy.properties.NumericProperty`
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and defaults to `0.2`.
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"""
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opening_transition = StringProperty("out_quad")
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"""
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The name of the animation transition type to use when animating to
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the :attr:`state` `'open'`.
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.. versionadded:: 1.0.0
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:attr:`opening_transition` is a :class:`~kivy.properties.StringProperty`
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and defaults to `'out_quad'`.
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"""
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closing_time = NumericProperty(0.2)
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"""
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The time taken for the panel to slide to the :attr:`state` `'close'`.
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.. versionadded:: 1.0.0
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:attr:`closing_time` is a :class:`~kivy.properties.NumericProperty`
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and defaults to `0.2`.
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"""
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closing_transition = StringProperty("out_quad")
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"""
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The name of the animation transition type to use when animating to
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the :attr:`state` 'close'.
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.. versionadded:: 1.0.0
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:attr:`closing_transition` is a :class:`~kivy.properties.StringProperty`
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and defaults to `'out_quad'`.
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"""
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_open_icon = ""
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_front_layer_open = False
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.register_event_type("on_open")
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self.register_event_type("on_close")
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Clock.schedule_once(
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lambda x: self.on_left_action_items(self, self.left_action_items)
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)
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def on_open(self) -> None:
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"""When the front layer drops."""
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def on_close(self) -> None:
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"""When the front layer rises."""
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def on_left_action_items(self, instance_backdrop, menu: list) -> None:
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if menu:
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self.left_action_items = [menu[0]]
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else:
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self.left_action_items = [["menu", lambda x: self.open()]]
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self._open_icon = self.left_action_items[0][0]
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def on_header(self, instance_backdrop, value: bool) -> None:
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def on_header(*args):
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if not value:
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self.ids._front_layer.remove_widget(self.ids.header_button)
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Clock.schedule_once(on_header)
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def open(self, open_up_to: int = 0) -> None:
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"""
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Opens the front layer.
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:open_up_to:
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the height to which the front screen will be lowered;
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if equal to zero - falls to the bottom of the screen;
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"""
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self.animate_opacity_icon()
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if self._front_layer_open:
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self.close()
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return
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if open_up_to:
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if open_up_to < (
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self.ids.header_button.height - self.ids._front_layer.height
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):
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y = self.ids.header_button.height - self.ids._front_layer.height
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elif open_up_to > 0:
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y = 0
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else:
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y = open_up_to
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else:
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y = self.ids.header_button.height - self.ids._front_layer.height
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Animation(y=y, d=self.opening_time, t=self.opening_transition).start(
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self.ids._front_layer
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)
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self._front_layer_open = True
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self.dispatch("on_open")
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def close(self) -> None:
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"""Opens the front layer."""
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Animation(y=0, d=self.closing_time, t=self.closing_transition).start(
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self.ids._front_layer
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)
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self._front_layer_open = False
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self.dispatch("on_close")
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def animate_opacity_icon(
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self,
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instance_icon_menu: Union[ActionTopAppBarButton, None] = None,
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opacity_value: int = 0,
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call_set_new_icon: bool = True,
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) -> None:
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"""Starts the opacity animation of the icon."""
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if not instance_icon_menu:
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instance_icon_menu = self.ids.toolbar.ids.left_actions.children[0]
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anim = Animation(
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opacity=opacity_value,
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d=self.opening_time,
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t=self.opening_transition,
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)
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if call_set_new_icon:
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anim.bind(on_complete=self.set_new_icon)
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anim.start(instance_icon_menu)
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def set_new_icon(
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self,
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instance_animation: Animation,
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instance_icon_menu: ActionTopAppBarButton,
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) -> None:
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"""
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Sets the icon of the button depending on the state of the backdrop.
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"""
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instance_icon_menu.icon = (
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self.close_icon
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if instance_icon_menu.icon == self._open_icon
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else self._open_icon
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)
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self.animate_opacity_icon(instance_icon_menu, 1, False)
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def add_widget(self, widget, index=0, canvas=None):
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if widget.__class__ in (MDBackdropToolbar, _BackLayer, _FrontLayer):
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return super().add_widget(widget)
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else:
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if widget.__class__ is MDBackdropBackLayer:
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self.ids.back_layer.add_widget(widget)
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elif widget.__class__ is MDBackdropFrontLayer:
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self.ids.front_layer.add_widget(widget)
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class MDBackdropToolbar(MDTopAppBar):
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"""Implements a toolbar for back content."""
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class MDBackdropFrontLayer(MDBoxLayout):
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"""Container for front content."""
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class MDBackdropBackLayer(MDBoxLayout):
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"""Container for back content."""
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class _BackLayer(BoxLayout):
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pass
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class _FrontLayer(MDCard, FakeRectangularElevationBehavior):
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pass
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