mirror of
https://github.com/markqvist/Sideband.git
synced 2024-12-28 00:49:32 -05:00
616 lines
17 KiB
Python
616 lines
17 KiB
Python
"""
|
||
Components/Hero
|
||
===============
|
||
|
||
.. versionadded:: 1.0.0
|
||
|
||
.. rubric:: Use the :class:`~MDHeroFrom` widget to animate a widget from one
|
||
screen to the next.
|
||
|
||
- The hero refers to the widget that flies between screens.
|
||
- Create a hero animation using KivyMD’s :class:`~MDHeroFrom` widget.
|
||
- Fly the hero from one screen to another.
|
||
- Animate the transformation of a hero’s shape from circular to rectangular while flying it from one screen to another.
|
||
- The :class:`~MDHeroFrom` widget in KivyMD implements a style of animation commonly known as shared element transitions or shared element animations.
|
||
|
||
.. raw:: html
|
||
|
||
<div style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; height: auto;">
|
||
<iframe
|
||
src="https://www.youtube.com/embed/qfQ4mmMR2Kg"
|
||
frameborder="0"
|
||
allowfullscreen
|
||
style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;"></iframe>
|
||
</div>
|
||
|
||
The widget that will move from screen A to screen B will be a hero. To move
|
||
a widget from one screen to another using hero animation, you need to do the
|
||
following:
|
||
|
||
- On screen **A**, place the :class:`~MDHeroFrom` container.
|
||
- Sets a tag (string) for the :class:`~MDHeroFrom` container.
|
||
- Place a hero in the :class:`~MDHeroFrom` container.
|
||
- On screen **B**, place the :class:`~MDHeroTo` container - our hero from screen **A **will fly into this container.
|
||
|
||
.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/hero-base.png
|
||
:align: center
|
||
|
||
.. warning::
|
||
:class:`~MDHeroFrom` container cannot have more than one child widget.
|
||
|
||
Base example
|
||
------------
|
||
|
||
.. code-block:: python
|
||
|
||
from kivy.lang import Builder
|
||
|
||
from kivymd.app import MDApp
|
||
|
||
KV = '''
|
||
MDScreenManager:
|
||
|
||
MDScreen:
|
||
name: "screen A"
|
||
md_bg_color: "lightblue"
|
||
|
||
MDHeroFrom:
|
||
id: hero_from
|
||
tag: "hero"
|
||
size_hint: None, None
|
||
size: "120dp", "120dp"
|
||
pos_hint: {"top": .98}
|
||
x: 24
|
||
|
||
FitImage:
|
||
source: "kivymd/images/logo/kivymd-icon-512.png"
|
||
size_hint: None, None
|
||
size: hero_from.size
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen B"
|
||
pos_hint: {"center_x": .5}
|
||
y: "36dp"
|
||
on_release:
|
||
root.current_heroes = ["hero"]
|
||
root.current = "screen B"
|
||
|
||
MDScreen:
|
||
name: "screen B"
|
||
hero_to: hero_to
|
||
md_bg_color: "cadetblue"
|
||
|
||
MDHeroTo:
|
||
id: hero_to
|
||
tag: "hero"
|
||
size_hint: None, None
|
||
size: "220dp", "220dp"
|
||
pos_hint: {"center_x": .5, "center_y": .5}
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen A"
|
||
pos_hint: {"center_x": .5}
|
||
y: "36dp"
|
||
on_release:
|
||
root.current_heroes = ["hero"]
|
||
root.current = "screen A"
|
||
'''
|
||
|
||
|
||
class Test(MDApp):
|
||
def build(self):
|
||
return Builder.load_string(KV)
|
||
|
||
|
||
Test().run()
|
||
|
||
.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/hero-usage.gif
|
||
:align: center
|
||
|
||
|
||
Note that the child of the :class:`~MDHeroFrom` widget must have the size of the parent:
|
||
|
||
.. code-block:: kv
|
||
|
||
MDHeroFrom:
|
||
id: hero_from
|
||
tag: "hero"
|
||
|
||
FitImage:
|
||
size_hint: None, None
|
||
size: hero_from.size
|
||
|
||
To enable hero animation before setting the name of the current screen for the
|
||
screen manager, you must specify the name of the tag of the :class:`~MDHeroFrom`
|
||
container in which the hero is located:
|
||
|
||
.. code-block:: kv
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen B"
|
||
on_release:
|
||
root.current_heroes = ["hero"]
|
||
root.current = "screen 2"
|
||
|
||
If you need to switch to a screen that does not contain heroes, set the
|
||
`current_hero` attribute for the screen manager as "" (empty string):
|
||
|
||
.. code-block:: kv
|
||
|
||
MDRaisedButton:
|
||
text: "Go To Another Screen"
|
||
on_release:
|
||
root.current_heroes = []
|
||
root.current = "another screen"
|
||
|
||
Example
|
||
-------
|
||
|
||
.. code-block:: python
|
||
|
||
from kivy.lang import Builder
|
||
|
||
from kivymd.app import MDApp
|
||
|
||
KV = '''
|
||
MDScreenManager:
|
||
|
||
MDScreen:
|
||
name: "screen A"
|
||
md_bg_color: "lightblue"
|
||
|
||
MDHeroFrom:
|
||
id: hero_from
|
||
tag: "hero"
|
||
size_hint: None, None
|
||
size: "120dp", "120dp"
|
||
pos_hint: {"top": .98}
|
||
x: 24
|
||
|
||
FitImage:
|
||
source: "kivymd/images/logo/kivymd-icon-512.png"
|
||
size_hint: None, None
|
||
size: hero_from.size
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen B"
|
||
pos_hint: {"center_x": .5}
|
||
y: "36dp"
|
||
on_release:
|
||
root.current_heroes = ["hero"]
|
||
root.current = "screen B"
|
||
|
||
MDScreen:
|
||
name: "screen B"
|
||
hero_to: hero_to
|
||
md_bg_color: "cadetblue"
|
||
|
||
MDHeroTo:
|
||
id: hero_to
|
||
tag: "hero"
|
||
size_hint: None, None
|
||
size: "220dp", "220dp"
|
||
pos_hint: {"center_x": .5, "center_y": .5}
|
||
|
||
MDRaisedButton:
|
||
text: "Go To Screen C"
|
||
pos_hint: {"center_x": .5}
|
||
y: "52dp"
|
||
on_release:
|
||
root.current_heroes = []
|
||
root.current = "screen C"
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen A"
|
||
pos_hint: {"center_x": .5}
|
||
y: "8dp"
|
||
on_release:
|
||
root.current_heroes = ["hero"]
|
||
root.current = "screen A"
|
||
|
||
MDScreen:
|
||
name: "screen C"
|
||
|
||
MDLabel:
|
||
text: "Screen C"
|
||
halign: "center"
|
||
|
||
MDRaisedButton:
|
||
text: "Back To Screen B"
|
||
pos_hint: {"center_x": .5}
|
||
y: "36dp"
|
||
on_release:
|
||
root.current = "screen B"
|
||
'''
|
||
|
||
|
||
class Test(MDApp):
|
||
def build(self):
|
||
return Builder.load_string(KV)
|
||
|
||
|
||
Test().run()
|
||
|
||
.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/hero-switch-another-screen.gif
|
||
:align: center
|
||
|
||
Events
|
||
------
|
||
|
||
Two events are available for the hero:
|
||
|
||
- `on_transform_in` - when the hero flies from screen **A** to screen **B**.
|
||
- `on_transform_out` - when the hero back from screen **B** to screen **A**.
|
||
|
||
The `on_transform_in`, `on_transform_out` events relate to the
|
||
:class:`~MDHeroFrom` container. For example, let's change the radius and
|
||
background color of the hero during the flight between the screens:
|
||
|
||
.. code-block:: python
|
||
|
||
from kivy import utils
|
||
from kivy.animation import Animation
|
||
from kivy.lang import Builder
|
||
from kivy.utils import get_color_from_hex
|
||
|
||
from kivymd.app import MDApp
|
||
from kivymd.uix.hero import MDHeroFrom
|
||
from kivymd.uix.relativelayout import MDRelativeLayout
|
||
|
||
KV = '''
|
||
MDScreenManager:
|
||
|
||
MDScreen:
|
||
name: "screen A"
|
||
md_bg_color: "lightblue"
|
||
|
||
MyHero:
|
||
id: hero_from
|
||
tag: "hero"
|
||
size_hint: None, None
|
||
size: "120dp", "120dp"
|
||
pos_hint: {"top": .98}
|
||
x: 24
|
||
|
||
MDRelativeLayout:
|
||
size_hint: None, None
|
||
size: hero_from.size
|
||
md_bg_color: "blue"
|
||
radius: [24, 12, 24, 12]
|
||
|
||
FitImage:
|
||
source: "https://github.com/kivymd/internal/raw/main/logo/kivymd_logo_blue.png"
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen B"
|
||
pos_hint: {"center_x": .5}
|
||
y: "36dp"
|
||
on_release:
|
||
root.current_heroes = ["hero"]
|
||
root.current = "screen B"
|
||
|
||
MDScreen:
|
||
name: "screen B"
|
||
hero_to: hero_to
|
||
md_bg_color: "cadetblue"
|
||
|
||
MDHeroTo:
|
||
id: hero_to
|
||
tag: "hero"
|
||
size_hint: None, None
|
||
size: "220dp", "220dp"
|
||
pos_hint: {"center_x": .5, "center_y": .5}
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen A"
|
||
pos_hint: {"center_x": .5}
|
||
y: "36dp"
|
||
on_release:
|
||
root.current_heroes = ["hero"]
|
||
root.current = "screen A"
|
||
'''
|
||
|
||
|
||
class Test(MDApp):
|
||
def build(self):
|
||
return Builder.load_string(KV)
|
||
|
||
|
||
class MyHero(MDHeroFrom):
|
||
def on_transform_in(
|
||
self, instance_hero_widget: MDRelativeLayout, duration: float
|
||
):
|
||
'''
|
||
Called when the hero flies from screen **A** to screen **B**.
|
||
|
||
:param instance_hero_widget: dhild widget of the `MDHeroFrom` class.
|
||
:param duration of the transition animation between screens.
|
||
'''
|
||
|
||
Animation(
|
||
radius=[12, 24, 12, 24],
|
||
duration=duration,
|
||
md_bg_color=(0, 1, 1, 1),
|
||
).start(instance_hero_widget)
|
||
|
||
def on_transform_out(
|
||
self, instance_hero_widget: MDRelativeLayout, duration: float
|
||
):
|
||
'''Called when the hero back from screen **B** to screen **A**.'''
|
||
|
||
Animation(
|
||
radius=[24, 12, 24, 12],
|
||
duration=duration,
|
||
md_bg_color=get_color_from_hex(utils.hex_colormap["blue"]),
|
||
).start(instance_hero_widget)
|
||
|
||
|
||
Test().run()
|
||
|
||
.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/hero-events.gif
|
||
:align: center
|
||
|
||
Usage with ScrollView
|
||
---------------------
|
||
|
||
.. code-block:: python
|
||
|
||
from kivy.animation import Animation
|
||
from kivy.clock import Clock
|
||
from kivy.lang import Builder
|
||
from kivy.properties import StringProperty, ObjectProperty
|
||
|
||
from kivymd.app import MDApp
|
||
from kivymd.uix.hero import MDHeroFrom
|
||
|
||
KV = '''
|
||
<HeroItem>
|
||
size_hint_y: None
|
||
height: "200dp"
|
||
radius: 24
|
||
|
||
MDSmartTile:
|
||
id: tile
|
||
radius: 24
|
||
box_radius: 0, 0, 24, 24
|
||
box_color: 0, 0, 0, .5
|
||
source: "kivymd/images/logo/kivymd-icon-512.png"
|
||
size_hint: None, None
|
||
size: root.size
|
||
mipmap: True
|
||
on_release: root.on_release()
|
||
|
||
MDLabel:
|
||
text: root.tag
|
||
bold: True
|
||
font_style: "H6"
|
||
opposite_colors: True
|
||
|
||
|
||
MDScreenManager:
|
||
|
||
MDScreen:
|
||
name: "screen A"
|
||
|
||
ScrollView:
|
||
|
||
MDGridLayout:
|
||
id: box
|
||
cols: 2
|
||
spacing: "12dp"
|
||
padding: "12dp"
|
||
adaptive_height: True
|
||
|
||
MDScreen:
|
||
name: "screen B"
|
||
heroes_to: [hero_to]
|
||
|
||
MDHeroTo:
|
||
id: hero_to
|
||
size_hint: 1, None
|
||
height: "220dp"
|
||
pos_hint: {"top": 1}
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen A"
|
||
pos_hint: {"center_x": .5}
|
||
y: "36dp"
|
||
on_release:
|
||
root.current_heroes = [hero_to.tag]
|
||
root.current = "screen A"
|
||
'''
|
||
|
||
|
||
class HeroItem(MDHeroFrom):
|
||
text = StringProperty()
|
||
manager = ObjectProperty()
|
||
|
||
def __init__(self, **kwargs):
|
||
super().__init__(**kwargs)
|
||
self.ids.tile.ids.image.ripple_duration_in_fast = 0.05
|
||
|
||
def on_transform_in(self, instance_hero_widget, duration):
|
||
Animation(
|
||
radius=[0, 0, 0, 0],
|
||
box_radius=[0, 0, 0, 0],
|
||
duration=duration,
|
||
).start(instance_hero_widget)
|
||
|
||
def on_transform_out(self, instance_hero_widget, duration):
|
||
Animation(
|
||
radius=[24, 24, 24, 24],
|
||
box_radius=[0, 0, 24, 24],
|
||
duration=duration,
|
||
).start(instance_hero_widget)
|
||
|
||
def on_release(self):
|
||
def switch_screen(*args):
|
||
self.manager.current_heroes = [self.tag]
|
||
self.manager.ids.hero_to.tag = self.tag
|
||
self.manager.current = "screen B"
|
||
|
||
Clock.schedule_once(switch_screen, 0.2)
|
||
|
||
|
||
class Test(MDApp):
|
||
def build(self):
|
||
return Builder.load_string(KV)
|
||
|
||
def on_start(self):
|
||
for i in range(12):
|
||
hero_item = HeroItem(
|
||
text=f"Item {i + 1}", tag=f"Tag {i}", manager=self.root
|
||
)
|
||
if not i % 2:
|
||
hero_item.md_bg_color = "lightgrey"
|
||
self.root.ids.box.add_widget(hero_item)
|
||
|
||
|
||
Test().run()
|
||
|
||
.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/hero-usage-with-scrollview.gif
|
||
:align: center
|
||
|
||
Using multiple heroes at the same time
|
||
--------------------------------------
|
||
|
||
.. code-block:: python
|
||
|
||
from kivy.lang import Builder
|
||
|
||
from kivymd.app import MDApp
|
||
|
||
KV = '''
|
||
MDScreenManager:
|
||
|
||
MDScreen:
|
||
name: "screen A"
|
||
md_bg_color: "lightblue"
|
||
|
||
MDHeroFrom:
|
||
id: hero_kivymd
|
||
tag: "kivymd"
|
||
size_hint: None, None
|
||
size: "200dp", "200dp"
|
||
pos_hint: {"top": .98}
|
||
x: 24
|
||
|
||
FitImage:
|
||
source: "kivymd/images/logo/kivymd-icon-512.png"
|
||
size_hint: None, None
|
||
size: hero_kivymd.size
|
||
|
||
MDHeroFrom:
|
||
id: hero_kivy
|
||
tag: "kivy"
|
||
size_hint: None, None
|
||
size: "200dp", "200dp"
|
||
pos_hint: {"top": .98}
|
||
x: 324
|
||
|
||
FitImage:
|
||
source: "data/logo/kivy-icon-512.png"
|
||
size_hint: None, None
|
||
size: hero_kivy.size
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen B"
|
||
pos_hint: {"center_x": .5}
|
||
y: "36dp"
|
||
on_release:
|
||
root.current_heroes = ["kivymd", "kivy"]
|
||
root.current = "screen B"
|
||
|
||
MDScreen:
|
||
name: "screen B"
|
||
heroes_to: hero_to_kivymd, hero_to_kivy
|
||
md_bg_color: "cadetblue"
|
||
|
||
MDHeroTo:
|
||
id: hero_to_kivy
|
||
tag: "kivy"
|
||
size_hint: None, None
|
||
pos_hint: {"center_x": .5, "center_y": .5}
|
||
|
||
MDHeroTo:
|
||
id: hero_to_kivymd
|
||
tag: "kivymd"
|
||
size_hint: None, None
|
||
pos_hint: {"right": 1, "top": 1}
|
||
|
||
MDRaisedButton:
|
||
text: "Move Hero To Screen A"
|
||
pos_hint: {"center_x": .5}
|
||
y: "36dp"
|
||
on_release:
|
||
root.current_heroes = ["kivy", "kivymd"]
|
||
root.current = "screen A"
|
||
'''
|
||
|
||
|
||
class Test(MDApp):
|
||
def build(self):
|
||
return Builder.load_string(KV)
|
||
|
||
|
||
Test().run()
|
||
|
||
.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/hero-multiple-heroes.gif
|
||
:align: center
|
||
"""
|
||
|
||
from kivy.properties import StringProperty
|
||
|
||
from kivymd.uix.boxlayout import MDBoxLayout
|
||
|
||
|
||
class MDHeroFrom(MDBoxLayout):
|
||
"""
|
||
The container from which the hero begins his flight.
|
||
|
||
For more information, see in the
|
||
:class:`~kivymd.uix.boxlayout.MDBoxLayout` class documentation.
|
||
|
||
:Events:
|
||
`on_transform_in`
|
||
when the hero flies from screen **A** to screen **B**.
|
||
`on_transform_out`
|
||
Called when the hero back from screen **B** to screen **A**.
|
||
"""
|
||
|
||
tag = StringProperty(allownone=True)
|
||
"""
|
||
Tag ID for heroes.
|
||
|
||
:attr:`tag` is an :class:`~kivy.properties.StringProperty`
|
||
and defaults to `''`.
|
||
"""
|
||
|
||
def __init__(self, **kwargs):
|
||
super().__init__(**kwargs)
|
||
self.register_event_type("on_transform_in")
|
||
self.register_event_type("on_transform_out")
|
||
|
||
def on_transform_in(self, *args):
|
||
"""Called when the hero flies from screen **A** to screen **B**."""
|
||
|
||
def on_transform_out(self, *args):
|
||
"""Called when the hero back from screen **B** to screen **A**."""
|
||
|
||
|
||
class MDHeroTo(MDBoxLayout):
|
||
"""
|
||
The container in which the hero comes.
|
||
|
||
For more information, see in the
|
||
:class:`~kivymd.uix.boxlayout.MDBoxLayout` class documentation.
|
||
"""
|
||
|
||
tag = StringProperty(allownone=True)
|
||
"""
|
||
Tag ID for heroes.
|
||
|
||
:attr:`tag` is an :class:`~kivy.properties.StringProperty`
|
||
and defaults to `''`.
|
||
"""
|