696 lines
24 KiB
Python
696 lines
24 KiB
Python
'''
|
|
Carousel
|
|
========
|
|
|
|
.. image:: images/carousel.gif
|
|
:align: right
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
The :class:`Carousel` widget provides the classic mobile-friendly carousel view
|
|
where you can swipe between slides.
|
|
You can add any content to the carousel and have it move horizontally or
|
|
vertically. The carousel can display pages in a sequence or a loop.
|
|
|
|
Example::
|
|
|
|
from kivy.app import App
|
|
from kivy.uix.carousel import Carousel
|
|
from kivy.uix.image import AsyncImage
|
|
|
|
|
|
class CarouselApp(App):
|
|
def build(self):
|
|
carousel = Carousel(direction='right')
|
|
for i in range(10):
|
|
src = "http://placehold.it/480x270.png&text=slide-%d&.png" % i
|
|
image = AsyncImage(source=src, fit_mode="contain")
|
|
carousel.add_widget(image)
|
|
return carousel
|
|
|
|
|
|
CarouselApp().run()
|
|
|
|
|
|
Kv Example::
|
|
|
|
Carousel:
|
|
direction: 'right'
|
|
AsyncImage:
|
|
source: 'http://placehold.it/480x270.png&text=slide-1.png'
|
|
AsyncImage:
|
|
source: 'http://placehold.it/480x270.png&text=slide-2.png'
|
|
AsyncImage:
|
|
source: 'http://placehold.it/480x270.png&text=slide-3.png'
|
|
AsyncImage:
|
|
source: 'http://placehold.it/480x270.png&text=slide-4.png'
|
|
|
|
|
|
.. versionchanged:: 1.5.0
|
|
The carousel now supports active children, like the
|
|
:class:`~kivy.uix.scrollview.ScrollView`. It will detect a swipe gesture
|
|
according to the :attr:`Carousel.scroll_timeout` and
|
|
:attr:`Carousel.scroll_distance` properties.
|
|
|
|
In addition, the slide container is no longer exposed by the API.
|
|
The impacted properties are
|
|
:attr:`Carousel.slides`, :attr:`Carousel.current_slide`,
|
|
:attr:`Carousel.previous_slide` and :attr:`Carousel.next_slide`.
|
|
|
|
'''
|
|
|
|
__all__ = ('Carousel', )
|
|
|
|
from functools import partial
|
|
from kivy.clock import Clock
|
|
from kivy.factory import Factory
|
|
from kivy.animation import Animation
|
|
from kivy.uix.stencilview import StencilView
|
|
from kivy.uix.relativelayout import RelativeLayout
|
|
from kivy.properties import BooleanProperty, OptionProperty, AliasProperty, \
|
|
NumericProperty, ListProperty, ObjectProperty, StringProperty
|
|
|
|
|
|
class Carousel(StencilView):
|
|
'''Carousel class. See module documentation for more information.
|
|
'''
|
|
|
|
slides = ListProperty([])
|
|
'''List of slides inside the Carousel. The slides are the
|
|
widgets added to the Carousel using the :attr:`add_widget` method.
|
|
|
|
:attr:`slides` is a :class:`~kivy.properties.ListProperty` and is
|
|
read-only.
|
|
'''
|
|
|
|
def _get_slides_container(self):
|
|
return [x.parent for x in self.slides]
|
|
|
|
slides_container = AliasProperty(_get_slides_container, bind=('slides',))
|
|
|
|
direction = OptionProperty('right',
|
|
options=('right', 'left', 'top', 'bottom'))
|
|
'''Specifies the direction in which the slides are ordered. This
|
|
corresponds to the direction from which the user swipes to go from one
|
|
slide to the next. It
|
|
can be `right`, `left`, `top`, or `bottom`. For example, with
|
|
the default value of `right`, the second slide is to the right
|
|
of the first and the user would swipe from the right towards the
|
|
left to get to the second slide.
|
|
|
|
:attr:`direction` is an :class:`~kivy.properties.OptionProperty` and
|
|
defaults to 'right'.
|
|
'''
|
|
|
|
min_move = NumericProperty(0.2)
|
|
'''Defines the minimum distance to be covered before the touch is
|
|
considered a swipe gesture and the Carousel content changed.
|
|
This is a expressed as a fraction of the Carousel's width.
|
|
If the movement doesn't reach this minimum value, the movement is
|
|
cancelled and the content is restored to its original position.
|
|
|
|
:attr:`min_move` is a :class:`~kivy.properties.NumericProperty` and
|
|
defaults to 0.2.
|
|
'''
|
|
|
|
anim_move_duration = NumericProperty(0.5)
|
|
'''Defines the duration of the Carousel animation between pages.
|
|
|
|
:attr:`anim_move_duration` is a :class:`~kivy.properties.NumericProperty`
|
|
and defaults to 0.5.
|
|
'''
|
|
|
|
anim_cancel_duration = NumericProperty(0.3)
|
|
'''Defines the duration of the animation when a swipe movement is not
|
|
accepted. This is generally when the user does not make a large enough
|
|
swipe. See :attr:`min_move`.
|
|
|
|
:attr:`anim_cancel_duration` is a :class:`~kivy.properties.NumericProperty`
|
|
and defaults to 0.3.
|
|
'''
|
|
|
|
loop = BooleanProperty(False)
|
|
'''Allow the Carousel to loop infinitely. If True, when the user tries to
|
|
swipe beyond last page, it will return to the first. If False, it will
|
|
remain on the last page.
|
|
|
|
:attr:`loop` is a :class:`~kivy.properties.BooleanProperty` and
|
|
defaults to False.
|
|
'''
|
|
|
|
def _get_index(self):
|
|
if self.slides:
|
|
return self._index % len(self.slides)
|
|
return None
|
|
|
|
def _set_index(self, value):
|
|
if self.slides:
|
|
self._index = value % len(self.slides)
|
|
else:
|
|
self._index = None
|
|
|
|
index = AliasProperty(_get_index, _set_index,
|
|
bind=('_index', 'slides'),
|
|
cache=True)
|
|
'''Get/Set the current slide based on the index.
|
|
|
|
:attr:`index` is an :class:`~kivy.properties.AliasProperty` and defaults
|
|
to 0 (the first item).
|
|
'''
|
|
|
|
def _prev_slide(self):
|
|
slides = self.slides
|
|
len_slides = len(slides)
|
|
index = self.index
|
|
if len_slides < 2: # None, or 1 slide
|
|
return None
|
|
if self.loop and index == 0:
|
|
return slides[-1]
|
|
if index > 0:
|
|
return slides[index - 1]
|
|
|
|
previous_slide = AliasProperty(_prev_slide,
|
|
bind=('slides', 'index', 'loop'),
|
|
cache=True)
|
|
'''The previous slide in the Carousel. It is None if the current slide is
|
|
the first slide in the Carousel. This ordering reflects the order in which
|
|
the slides are added: their presentation varies according to the
|
|
:attr:`direction` property.
|
|
|
|
:attr:`previous_slide` is an :class:`~kivy.properties.AliasProperty`.
|
|
|
|
.. versionchanged:: 1.5.0
|
|
This property no longer exposes the slides container. It returns
|
|
the widget you have added.
|
|
'''
|
|
|
|
def _curr_slide(self):
|
|
if len(self.slides):
|
|
return self.slides[self.index or 0]
|
|
|
|
current_slide = AliasProperty(_curr_slide,
|
|
bind=('slides', 'index'),
|
|
cache=True)
|
|
'''The currently shown slide.
|
|
|
|
:attr:`current_slide` is an :class:`~kivy.properties.AliasProperty`.
|
|
|
|
.. versionchanged:: 1.5.0
|
|
The property no longer exposes the slides container. It returns
|
|
the widget you have added.
|
|
'''
|
|
|
|
def _next_slide(self):
|
|
if len(self.slides) < 2: # None, or 1 slide
|
|
return None
|
|
if self.loop and self.index == len(self.slides) - 1:
|
|
return self.slides[0]
|
|
if self.index < len(self.slides) - 1:
|
|
return self.slides[self.index + 1]
|
|
|
|
next_slide = AliasProperty(_next_slide,
|
|
bind=('slides', 'index', 'loop'),
|
|
cache=True)
|
|
'''The next slide in the Carousel. It is None if the current slide is
|
|
the last slide in the Carousel. This ordering reflects the order in which
|
|
the slides are added: their presentation varies according to the
|
|
:attr:`direction` property.
|
|
|
|
:attr:`next_slide` is an :class:`~kivy.properties.AliasProperty`.
|
|
|
|
.. versionchanged:: 1.5.0
|
|
The property no longer exposes the slides container.
|
|
It returns the widget you have added.
|
|
'''
|
|
|
|
scroll_timeout = NumericProperty(200)
|
|
'''Timeout allowed to trigger the :attr:`scroll_distance`, in milliseconds.
|
|
If the user has not moved :attr:`scroll_distance` within the timeout,
|
|
no scrolling will occur and the touch event will go to the children.
|
|
|
|
:attr:`scroll_timeout` is a :class:`~kivy.properties.NumericProperty` and
|
|
defaults to 200 (milliseconds)
|
|
|
|
.. versionadded:: 1.5.0
|
|
'''
|
|
|
|
scroll_distance = NumericProperty('20dp')
|
|
'''Distance to move before scrolling the :class:`Carousel` in pixels. As
|
|
soon as the distance has been traveled, the :class:`Carousel` will start
|
|
to scroll, and no touch event will go to children.
|
|
It is advisable that you base this value on the dpi of your target device's
|
|
screen.
|
|
|
|
:attr:`scroll_distance` is a :class:`~kivy.properties.NumericProperty` and
|
|
defaults to 20dp.
|
|
|
|
.. versionadded:: 1.5.0
|
|
'''
|
|
|
|
anim_type = StringProperty('out_quad')
|
|
'''Type of animation to use while animating to the next/previous slide.
|
|
This should be the name of an
|
|
:class:`~kivy.animation.AnimationTransition` function.
|
|
|
|
:attr:`anim_type` is a :class:`~kivy.properties.StringProperty` and
|
|
defaults to 'out_quad'.
|
|
|
|
.. versionadded:: 1.8.0
|
|
'''
|
|
|
|
ignore_perpendicular_swipes = BooleanProperty(False)
|
|
'''Ignore swipes on axis perpendicular to direction.
|
|
|
|
:attr:`ignore_perpendicular_swipes` is a
|
|
:class:`~kivy.properties.BooleanProperty` and defaults to False.
|
|
|
|
.. versionadded:: 1.10.0
|
|
'''
|
|
|
|
# private properties, for internal use only ###
|
|
_index = NumericProperty(0, allownone=True)
|
|
_prev = ObjectProperty(None, allownone=True)
|
|
_current = ObjectProperty(None, allownone=True)
|
|
_next = ObjectProperty(None, allownone=True)
|
|
_offset = NumericProperty(0)
|
|
_touch = ObjectProperty(None, allownone=True)
|
|
|
|
_change_touch_mode_ev = None
|
|
|
|
def __init__(self, **kwargs):
|
|
self._trigger_position_visible_slides = Clock.create_trigger(
|
|
self._position_visible_slides, -1)
|
|
super(Carousel, self).__init__(**kwargs)
|
|
self._skip_slide = None
|
|
self.touch_mode_change = False
|
|
self._prioritize_next = False
|
|
self.fbind('loop', lambda *args: self._insert_visible_slides())
|
|
|
|
def load_slide(self, slide):
|
|
'''Animate to the slide that is passed as the argument.
|
|
|
|
.. versionchanged:: 1.8.0
|
|
'''
|
|
slides = self.slides
|
|
start, stop = slides.index(self.current_slide), slides.index(slide)
|
|
if start == stop:
|
|
return
|
|
|
|
self._skip_slide = stop
|
|
if stop > start:
|
|
self._prioritize_next = True
|
|
self._insert_visible_slides(_next_slide=slide)
|
|
self.load_next()
|
|
else:
|
|
self._prioritize_next = False
|
|
self._insert_visible_slides(_prev_slide=slide)
|
|
self.load_previous()
|
|
|
|
def load_previous(self):
|
|
'''Animate to the previous slide.
|
|
|
|
.. versionadded:: 1.7.0
|
|
'''
|
|
self.load_next(mode='prev')
|
|
|
|
def load_next(self, mode='next'):
|
|
'''Animate to the next slide.
|
|
|
|
.. versionadded:: 1.7.0
|
|
'''
|
|
if self.index is not None:
|
|
w, h = self.size
|
|
_direction = {
|
|
'top': -h / 2,
|
|
'bottom': h / 2,
|
|
'left': w / 2,
|
|
'right': -w / 2}
|
|
_offset = _direction[self.direction]
|
|
if mode == 'prev':
|
|
_offset = -_offset
|
|
|
|
self._start_animation(min_move=0, offset=_offset)
|
|
|
|
def get_slide_container(self, slide):
|
|
return slide.parent
|
|
|
|
@property
|
|
def _prev_equals_next(self):
|
|
return self.loop and len(self.slides) == 2
|
|
|
|
def _insert_visible_slides(self, _next_slide=None, _prev_slide=None):
|
|
get_slide_container = self.get_slide_container
|
|
|
|
previous_slide = _prev_slide if _prev_slide else self.previous_slide
|
|
if previous_slide:
|
|
self._prev = get_slide_container(previous_slide)
|
|
else:
|
|
self._prev = None
|
|
|
|
current_slide = self.current_slide
|
|
if current_slide:
|
|
self._current = get_slide_container(current_slide)
|
|
else:
|
|
self._current = None
|
|
|
|
next_slide = _next_slide if _next_slide else self.next_slide
|
|
if next_slide:
|
|
self._next = get_slide_container(next_slide)
|
|
else:
|
|
self._next = None
|
|
|
|
if self._prev_equals_next:
|
|
setattr(self, '_prev' if self._prioritize_next else '_next', None)
|
|
|
|
super_remove = super(Carousel, self).remove_widget
|
|
for container in self.slides_container:
|
|
super_remove(container)
|
|
|
|
if self._prev and self._prev.parent is not self:
|
|
super(Carousel, self).add_widget(self._prev)
|
|
if self._next and self._next.parent is not self:
|
|
super(Carousel, self).add_widget(self._next)
|
|
if self._current:
|
|
super(Carousel, self).add_widget(self._current)
|
|
|
|
def _position_visible_slides(self, *args):
|
|
slides, index = self.slides, self.index
|
|
no_of_slides = len(slides) - 1
|
|
if not slides:
|
|
return
|
|
x, y, width, height = self.x, self.y, self.width, self.height
|
|
_offset, direction = self._offset, self.direction[0]
|
|
_prev, _next, _current = self._prev, self._next, self._current
|
|
get_slide_container = self.get_slide_container
|
|
last_slide = get_slide_container(slides[-1])
|
|
first_slide = get_slide_container(slides[0])
|
|
skip_next = False
|
|
_loop = self.loop
|
|
|
|
if direction in 'rl':
|
|
xoff = x + _offset
|
|
x_prev = {'l': xoff + width, 'r': xoff - width}
|
|
x_next = {'l': xoff - width, 'r': xoff + width}
|
|
if _prev:
|
|
_prev.pos = (x_prev[direction], y)
|
|
elif _loop and _next and index == 0:
|
|
# if first slide is moving to right with direction set to right
|
|
# or toward left with direction set to left
|
|
if ((_offset > 0 and direction == 'r') or
|
|
(_offset < 0 and direction == 'l')):
|
|
# put last_slide before first slide
|
|
last_slide.pos = (x_prev[direction], y)
|
|
skip_next = True
|
|
if _current:
|
|
_current.pos = (xoff, y)
|
|
if skip_next:
|
|
return
|
|
if _next:
|
|
_next.pos = (x_next[direction], y)
|
|
elif _loop and _prev and index == no_of_slides:
|
|
if ((_offset < 0 and direction == 'r') or
|
|
(_offset > 0 and direction == 'l')):
|
|
first_slide.pos = (x_next[direction], y)
|
|
if direction in 'tb':
|
|
yoff = y + _offset
|
|
y_prev = {'t': yoff - height, 'b': yoff + height}
|
|
y_next = {'t': yoff + height, 'b': yoff - height}
|
|
if _prev:
|
|
_prev.pos = (x, y_prev[direction])
|
|
elif _loop and _next and index == 0:
|
|
if ((_offset > 0 and direction == 't') or
|
|
(_offset < 0 and direction == 'b')):
|
|
last_slide.pos = (x, y_prev[direction])
|
|
skip_next = True
|
|
if _current:
|
|
_current.pos = (x, yoff)
|
|
if skip_next:
|
|
return
|
|
if _next:
|
|
_next.pos = (x, y_next[direction])
|
|
elif _loop and _prev and index == no_of_slides:
|
|
if ((_offset < 0 and direction == 't') or
|
|
(_offset > 0 and direction == 'b')):
|
|
first_slide.pos = (x, y_next[direction])
|
|
|
|
def on_size(self, *args):
|
|
size = self.size
|
|
for slide in self.slides_container:
|
|
slide.size = size
|
|
self._trigger_position_visible_slides()
|
|
|
|
def on_pos(self, *args):
|
|
self._trigger_position_visible_slides()
|
|
|
|
def on_index(self, *args):
|
|
self._insert_visible_slides()
|
|
self._trigger_position_visible_slides()
|
|
self._offset = 0
|
|
|
|
def on_slides(self, *args):
|
|
if self.slides:
|
|
self.index = self.index % len(self.slides)
|
|
self._insert_visible_slides()
|
|
self._trigger_position_visible_slides()
|
|
|
|
def on__offset(self, *args):
|
|
self._trigger_position_visible_slides()
|
|
# if reached full offset, switch index to next or prev
|
|
direction = self.direction[0]
|
|
_offset = self._offset
|
|
width = self.width
|
|
height = self.height
|
|
index = self.index
|
|
if self._skip_slide is not None or index is None:
|
|
return
|
|
|
|
# Move to next slide?
|
|
if (direction == 'r' and _offset <= -width) or \
|
|
(direction == 'l' and _offset >= width) or \
|
|
(direction == 't' and _offset <= - height) or \
|
|
(direction == 'b' and _offset >= height):
|
|
if self.next_slide:
|
|
self.index += 1
|
|
|
|
# Move to previous slide?
|
|
elif (direction == 'r' and _offset >= width) or \
|
|
(direction == 'l' and _offset <= -width) or \
|
|
(direction == 't' and _offset >= height) or \
|
|
(direction == 'b' and _offset <= -height):
|
|
if self.previous_slide:
|
|
self.index -= 1
|
|
|
|
elif self._prev_equals_next:
|
|
new_value = (_offset < 0) is (direction in 'rt')
|
|
if self._prioritize_next is not new_value:
|
|
self._prioritize_next = new_value
|
|
if new_value is (self._next is None):
|
|
self._prev, self._next = self._next, self._prev
|
|
|
|
def _start_animation(self, *args, **kwargs):
|
|
# compute target offset for ease back, next or prev
|
|
new_offset = 0
|
|
direction = kwargs.get('direction', self.direction)[0]
|
|
is_horizontal = direction in 'rl'
|
|
extent = self.width if is_horizontal else self.height
|
|
min_move = kwargs.get('min_move', self.min_move)
|
|
_offset = kwargs.get('offset', self._offset)
|
|
|
|
if _offset < min_move * -extent:
|
|
new_offset = -extent
|
|
elif _offset > min_move * extent:
|
|
new_offset = extent
|
|
|
|
# if new_offset is 0, it wasn't enough to go next/prev
|
|
dur = self.anim_move_duration
|
|
if new_offset == 0:
|
|
dur = self.anim_cancel_duration
|
|
|
|
# detect edge cases if not looping
|
|
len_slides = len(self.slides)
|
|
index = self.index
|
|
if not self.loop or len_slides == 1:
|
|
is_first = (index == 0)
|
|
is_last = (index == len_slides - 1)
|
|
if direction in 'rt':
|
|
towards_prev = (new_offset > 0)
|
|
towards_next = (new_offset < 0)
|
|
else:
|
|
towards_prev = (new_offset < 0)
|
|
towards_next = (new_offset > 0)
|
|
if (is_first and towards_prev) or (is_last and towards_next):
|
|
new_offset = 0
|
|
|
|
anim = Animation(_offset=new_offset, d=dur, t=self.anim_type)
|
|
anim.cancel_all(self)
|
|
|
|
def _cmp(*l):
|
|
if self._skip_slide is not None:
|
|
self.index = self._skip_slide
|
|
self._skip_slide = None
|
|
|
|
anim.bind(on_complete=_cmp)
|
|
anim.start(self)
|
|
|
|
def _get_uid(self, prefix='sv'):
|
|
return '{0}.{1}'.format(prefix, self.uid)
|
|
|
|
def on_touch_down(self, touch):
|
|
if not self.collide_point(*touch.pos):
|
|
touch.ud[self._get_uid('cavoid')] = True
|
|
return
|
|
if self.disabled:
|
|
return True
|
|
if self._touch:
|
|
return super(Carousel, self).on_touch_down(touch)
|
|
Animation.cancel_all(self)
|
|
self._touch = touch
|
|
uid = self._get_uid()
|
|
touch.grab(self)
|
|
touch.ud[uid] = {
|
|
'mode': 'unknown',
|
|
'time': touch.time_start}
|
|
self._change_touch_mode_ev = Clock.schedule_once(
|
|
self._change_touch_mode, self.scroll_timeout / 1000.)
|
|
self.touch_mode_change = False
|
|
return True
|
|
|
|
def on_touch_move(self, touch):
|
|
if not self.touch_mode_change:
|
|
if self.ignore_perpendicular_swipes and \
|
|
self.direction in ('top', 'bottom'):
|
|
if abs(touch.oy - touch.y) < self.scroll_distance:
|
|
if abs(touch.ox - touch.x) > self.scroll_distance:
|
|
self._change_touch_mode()
|
|
self.touch_mode_change = True
|
|
elif self.ignore_perpendicular_swipes and \
|
|
self.direction in ('right', 'left'):
|
|
if abs(touch.ox - touch.x) < self.scroll_distance:
|
|
if abs(touch.oy - touch.y) > self.scroll_distance:
|
|
self._change_touch_mode()
|
|
self.touch_mode_change = True
|
|
|
|
if self._get_uid('cavoid') in touch.ud:
|
|
return
|
|
if self._touch is not touch:
|
|
super(Carousel, self).on_touch_move(touch)
|
|
return self._get_uid() in touch.ud
|
|
if touch.grab_current is not self:
|
|
return True
|
|
ud = touch.ud[self._get_uid()]
|
|
direction = self.direction[0]
|
|
if ud['mode'] == 'unknown':
|
|
if direction in 'rl':
|
|
distance = abs(touch.ox - touch.x)
|
|
else:
|
|
distance = abs(touch.oy - touch.y)
|
|
if distance > self.scroll_distance:
|
|
ev = self._change_touch_mode_ev
|
|
if ev is not None:
|
|
ev.cancel()
|
|
ud['mode'] = 'scroll'
|
|
else:
|
|
if direction in 'rl':
|
|
self._offset += touch.dx
|
|
if direction in 'tb':
|
|
self._offset += touch.dy
|
|
return True
|
|
|
|
def on_touch_up(self, touch):
|
|
if self._get_uid('cavoid') in touch.ud:
|
|
return
|
|
if self in [x() for x in touch.grab_list]:
|
|
touch.ungrab(self)
|
|
self._touch = None
|
|
ud = touch.ud[self._get_uid()]
|
|
if ud['mode'] == 'unknown':
|
|
ev = self._change_touch_mode_ev
|
|
if ev is not None:
|
|
ev.cancel()
|
|
super(Carousel, self).on_touch_down(touch)
|
|
Clock.schedule_once(partial(self._do_touch_up, touch), .1)
|
|
else:
|
|
self._start_animation()
|
|
|
|
else:
|
|
if self._touch is not touch and self.uid not in touch.ud:
|
|
super(Carousel, self).on_touch_up(touch)
|
|
return self._get_uid() in touch.ud
|
|
|
|
def _do_touch_up(self, touch, *largs):
|
|
super(Carousel, self).on_touch_up(touch)
|
|
# don't forget about grab event!
|
|
for x in touch.grab_list[:]:
|
|
touch.grab_list.remove(x)
|
|
x = x()
|
|
if not x:
|
|
continue
|
|
touch.grab_current = x
|
|
super(Carousel, self).on_touch_up(touch)
|
|
touch.grab_current = None
|
|
|
|
def _change_touch_mode(self, *largs):
|
|
if not self._touch:
|
|
return
|
|
self._start_animation()
|
|
uid = self._get_uid()
|
|
touch = self._touch
|
|
ud = touch.ud[uid]
|
|
if ud['mode'] == 'unknown':
|
|
touch.ungrab(self)
|
|
self._touch = None
|
|
super(Carousel, self).on_touch_down(touch)
|
|
return
|
|
|
|
def add_widget(self, widget, index=0, *args, **kwargs):
|
|
container = RelativeLayout(
|
|
size=self.size, x=self.x - self.width, y=self.y)
|
|
container.add_widget(widget)
|
|
super(Carousel, self).add_widget(container, index, *args, **kwargs)
|
|
if index != 0:
|
|
self.slides.insert(index - len(self.slides), widget)
|
|
else:
|
|
self.slides.append(widget)
|
|
|
|
def remove_widget(self, widget, *args, **kwargs):
|
|
# XXX be careful, the widget.parent refer to the RelativeLayout
|
|
# added in add_widget(). But it will break if RelativeLayout
|
|
# implementation change.
|
|
# if we passed the real widget
|
|
slides = self.slides
|
|
if widget in slides:
|
|
if self.index >= slides.index(widget):
|
|
self.index = max(0, self.index - 1)
|
|
container = widget.parent
|
|
slides.remove(widget)
|
|
super(Carousel, self).remove_widget(container, *args, **kwargs)
|
|
container.remove_widget(widget)
|
|
return
|
|
super(Carousel, self).remove_widget(widget, *args, **kwargs)
|
|
|
|
def clear_widgets(self, children=None, *args, **kwargs):
|
|
# `children` must be a list of slides or None
|
|
if children is None:
|
|
children = self.slides[:]
|
|
remove_widget = self.remove_widget
|
|
for widget in children:
|
|
remove_widget(widget)
|
|
super(Carousel, self).clear_widgets()
|
|
|
|
|
|
if __name__ == '__main__':
|
|
from kivy.app import App
|
|
|
|
class Example1(App):
|
|
|
|
def build(self):
|
|
carousel = Carousel(direction='left',
|
|
loop=True)
|
|
for i in range(4):
|
|
src = "http://placehold.it/480x270.png&text=slide-%d&.png" % i
|
|
image = Factory.AsyncImage(source=src, fit_mode="contain")
|
|
carousel.add_widget(image)
|
|
return carousel
|
|
|
|
Example1().run()
|