317 lines
7.9 KiB
Python
317 lines
7.9 KiB
Python
"""
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Components/ProgressBar
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======================
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.. seealso::
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`Material Design spec, Progress indicators <https://material.io/components/progress-indicators>`_
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.. rubric:: Progress indicators express an unspecified wait time or display
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the length of a process.
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/progress-bar-preview.png
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:align: center
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`KivyMD` provides the following bars classes for use:
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- MDProgressBar_
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- Determinate_
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- Indeterminate_
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.. MDProgressBar:
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MDProgressBar
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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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KV = '''
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MDBoxLayout:
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padding: "10dp"
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MDProgressBar:
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value: 50
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'''
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class Test(MDApp):
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def build(self):
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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/progress-bar.png
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:align: center
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Vertical orientation
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--------------------
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.. code-block:: kv
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MDProgressBar:
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orientation: "vertical"
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value: 50
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/progress-bar-vertical.png
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:align: center
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With custom color
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-----------------
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.. code-block:: kv
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MDProgressBar:
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value: 50
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color: app.theme_cls.accent_color
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/progress-bar-custom-color.png
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:align: center
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.. Indeterminate:
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Indeterminate
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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 kivy.properties import StringProperty
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from kivymd.app import MDApp
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KV = '''
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MDScreen:
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MDProgressBar:
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id: progress
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pos_hint: {"center_y": .6}
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type: "indeterminate"
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MDRaisedButton:
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text: "STOP" if app.state == "start" else "START"
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pos_hint: {"center_x": .5, "center_y": .45}
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on_press: app.state = "stop" if app.state == "start" else "start"
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'''
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class Test(MDApp):
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state = StringProperty("stop")
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def build(self):
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return Builder.load_string(KV)
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def on_state(self, instance, value):
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{
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"start": self.root.ids.progress.start,
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"stop": self.root.ids.progress.stop,
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}.get(value)()
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Test().run()
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/indeterminate-progress-bar.gif
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:align: center
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.. Determinate:
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Determinate
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-----------
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.. code-block:: kv
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MDProgressBar:
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type: "determinate"
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running_duration: 1
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catching_duration: 1.5
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.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/determinate-progress-bar.gif
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:align: center
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"""
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__all__ = ("MDProgressBar",)
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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.metrics import dp
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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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OptionProperty,
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StringProperty,
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)
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from kivy.uix.progressbar import ProgressBar
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from kivymd import uix_path
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from kivymd.theming import ThemableBehavior
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with open(
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os.path.join(uix_path, "progressbar", "progressbar.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 MDProgressBar(ThemableBehavior, ProgressBar):
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reversed = BooleanProperty(False)
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"""
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Reverse the direction the progressbar moves.
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:attr:`reversed` is an :class:`~kivy.properties.BooleanProperty`
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and defaults to `False`.
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"""
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orientation = OptionProperty(
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"horizontal", options=["horizontal", "vertical"]
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)
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"""
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Orientation of progressbar. Available options are: `'horizontal '`,
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`'vertical'`.
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:attr:`orientation` is an :class:`~kivy.properties.OptionProperty`
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and defaults to `'horizontal'`.
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"""
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color = ColorProperty(None)
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"""
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Progress bar color in ``rgba`` format.
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:attr:`color` is an :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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back_color = ColorProperty(None)
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"""
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Progress bar back color in ``rgba`` format.
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.. versionadded:: 1.0.0
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:attr:`back_color` is an :class:`~kivy.properties.ColorProperty`
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and defaults to `None`.
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"""
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running_transition = StringProperty("in_cubic")
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"""
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Running transition.
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:attr:`running_transition` is an :class:`~kivy.properties.StringProperty`
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and defaults to `'in_cubic'`.
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"""
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catching_transition = StringProperty("out_quart")
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"""
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Catching transition.
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:attr:`catching_transition` is an :class:`~kivy.properties.StringProperty`
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and defaults to `'out_quart'`.
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"""
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running_duration = NumericProperty(0.5)
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"""
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Running duration.
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:attr:`running_duration` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `0.5`.
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"""
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catching_duration = NumericProperty(0.8)
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"""
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Catching duration.
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:attr:`running_duration` is an :class:`~kivy.properties.NumericProperty`
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and defaults to `0.8`.
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"""
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type = OptionProperty(
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None, options=["indeterminate", "determinate"], allownone=True
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)
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"""
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Type of progressbar. Available options are: `'indeterminate '`,
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`'determinate'`.
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:attr:`type` is an :class:`~kivy.properties.OptionProperty`
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and defaults to `None`.
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"""
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_x = NumericProperty(0)
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def __init__(self, **kwargs):
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self.catching_anim = None
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self.running_anim = None
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super().__init__(**kwargs)
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Clock.schedule_once(self.check_size)
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def check_size(self, interval: Union[int, float]) -> None:
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if self.size == [100, 100]:
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if self.orientation == "horizontal":
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self.size_hint_y = None
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self.height = dp(4)
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elif self.orientation == "vertical":
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self.size_hint_x = None
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self.width = dp(4)
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def start(self) -> None:
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"""Start animation."""
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if self.type in ("indeterminate", "determinate"):
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Clock.schedule_once(self._set_default_value)
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if not self.catching_anim and not self.running_anim:
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if self.type == "indeterminate":
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self._create_indeterminate_animations()
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else:
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self._create_determinate_animations()
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self.running_away()
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def stop(self) -> None:
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"""Stop animation."""
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Animation.cancel_all(self)
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self._set_default_value(0)
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def running_away(self, *args) -> None:
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self._set_default_value(0)
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self.running_anim.start(self)
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def catching_up(self, *args) -> None:
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if self.type == "indeterminate":
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self.reversed = True
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self.catching_anim.start(self)
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def _create_determinate_animations(self):
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self.running_anim = Animation(
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value=100,
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opacity=1,
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t=self.running_transition,
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d=self.running_duration,
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)
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self.running_anim.bind(on_complete=self.catching_up)
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self.catching_anim = Animation(
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opacity=0,
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t=self.catching_transition,
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d=self.catching_duration,
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)
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self.catching_anim.bind(on_complete=self.running_away)
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def _create_indeterminate_animations(self):
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self.running_anim = Animation(
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_x=self.width / 2,
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value=50,
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t=self.running_transition,
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d=self.running_duration,
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)
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self.running_anim.bind(on_complete=self.catching_up)
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self.catching_anim = Animation(
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value=0, t=self.catching_transition, d=self.catching_duration
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)
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self.catching_anim.bind(on_complete=self.running_away)
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def _set_default_value(self, interval):
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self._x = 0
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self.value = 0
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self.reversed = False
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