巨蟒基维。如何更改页面布局的方向？
巨蟒基维。如何更改页面布局的方向？
提问于 2018-08-14 05:38:33
我需要将方向更改为垂直方向，但它的工作方式与BoxLayout不同。在Kivy官方文档中也没有关于这方面的信息。此外，有没有办法通过从屏幕上的任何位置滑动来更改页面，而不仅仅是从边框？
Python：
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
class MainScreen(Screen):
pass
class ScreenManagement(ScreenManager):
pass
presentation = Builder.load_file("final.kv")
class MainApp(App):
def build(self):
return presentation
if __name__ == "__main__":
MainApp().run()Kivy：
ScreenManagement:
MainScreen:
<MainScreen>:
canvas:
Rectangle:
source: "nakedman.jpg"
pos: self.pos
size: self.size
name: "main"
PageLayout:
orientation: "vertical"
BoxLayout:
Button:
text: "Button1"
Button:
text: "Button2"
BoxLayout:
Button:
text: "Button3"
Button:
text: "Button4" 回答 1
Stack Overflow用户
发布于 2018-08-14 08:09:58
PageLayout没有orientation属性，因此您必须构建所有内容，在本例中使用source code of PageLayout获取以下新代码：
__all__ = ('PageLayoutVertical', )
from kivy.uix.layout import Layout
from kivy.properties import NumericProperty, DictProperty
from kivy.animation import Animation
class PageLayoutVertical(Layout):
'''PageLayout class. See module documentation for more information.
'''
page = NumericProperty(0)
'''The currently displayed page.
:data:`page` is a :class:`~kivy.properties.NumericProperty` and defaults
to 0.
'''
border = NumericProperty('50dp')
'''The width of the border around the current page used to display
the previous/next page swipe areas when needed.
:data:`border` is a :class:`~kivy.properties.NumericProperty` and
defaults to 50dp.
'''
swipe_threshold = NumericProperty(.5)
'''The thresold used to trigger swipes as percentage of the widget
size.
:data:`swipe_threshold` is a :class:`~kivy.properties.NumericProperty`
and defaults to .5.
'''
anim_kwargs = DictProperty({'d': .5, 't': 'in_quad'})
'''The animation kwargs used to construct the animation
:data:`anim_kwargs` is a :class:`~kivy.properties.DictProperty`
and defaults to {'d': .5, 't': 'in_quad'}.
.. versionadded:: 1.11.0
'''
def __init__(self, **kwargs):
super(PageLayoutVertical, self).__init__(**kwargs)
trigger = self._trigger_layout
fbind = self.fbind
fbind('border', trigger)
fbind('page', trigger)
fbind('parent', trigger)
fbind('children', trigger)
fbind('size', trigger)
fbind('pos', trigger)
def do_layout(self, *largs):
l_children = len(self.children) - 1
w = self.width
x_parent, y_parent = self.pos
p = self.page
border = self.border
half_border = border / 2.
top = self.top
height = self.height - border
for i, c in enumerate(reversed(self.children)):
if i < p:
y = y_parent
elif i == p:
if not p: # it's first page
y = y_parent
elif p != l_children: # not first, but there are post pages
y = y_parent + half_border
else: # not first and there are no post pages
y = y_parent + border
elif i == p + 1:
if not p: # second page - no left margin
y = top - border
else: # there's already a left margin
y = top - half_border
else:
y = top
c.width = w
c.height = height
Animation(
x=x_parent,
y=y,
**self.anim_kwargs).start(c)
def on_touch_down(self, touch):
if (
self.disabled or
not self.collide_point(*touch.pos) or
not self.children
):
return
page = self.children[-self.page - 1]
if self.y <= touch.y < page.y:
touch.ud['page'] = 'previous'
touch.grab(self)
return True
elif page.top <= touch.y < self.top:
touch.ud['page'] = 'next'
touch.grab(self)
return True
return page.on_touch_down(touch)
def on_touch_move(self, touch):
if touch.grab_current != self:
return
p = self.page
border = self.border
half_border = border / 2.
page = self.children[-p - 1]
if touch.ud['page'] == 'previous':
# move next page upto right edge
if p < len(self.children) - 1:
self.children[-p - 2].y = min(
self.top - self.border * (1 - (touch.sy - touch.osy)),
self.top)
# move current page until edge hits the right border
if p >= 1:
b_right = half_border if p > 1 else border
b_left = half_border if p < len(self.children) - 1 else border
self.children[-p - 1].y = max(min(
self.y + b_left + (touch.y - touch.oy),
self.top - b_right),
self.y + b_left)
# move previous page left edge upto left border
if p > 1:
self.children[-p].y = min(
self.y + half_border * (touch.sy - touch.osy),
self.y + half_border)
elif touch.ud['page'] == 'next':
# move current page upto left edge
if p >= 1:
self.children[-p - 1].y = max(
self.y + half_border * (1 - (touch.osy - touch.sy)),
self.y)
# move next page until its edge hit the left border
if p < len(self.children) - 1:
b_right = half_border if p >= 1 else border
b_left = half_border if p < len(self.children) - 2 else border
self.children[-p - 2].y = min(max(
self.top - b_right + (touch.y - touch.oy),
self.y + b_left),
self.top - b_right)
# move second next page upto right border
if p < len(self.children) - 2:
self.children[-p - 3].y = max(
self.top + half_border * (touch.sy - touch.osy),
self.top - half_border)
return page.on_touch_move(touch)
def on_touch_up(self, touch):
if touch.grab_current == self:
if (
touch.ud['page'] == 'previous' and
abs(touch.y - touch.oy) / self.height > self.swipe_threshold
):
self.page -= 1
elif (
touch.ud['page'] == 'next' and
abs(touch.y - touch.oy) / self.height > self.swipe_threshold
):
self.page += 1
else:
self._trigger_layout()
touch.ungrab(self)
if len(self.children) > 1:
return self.children[-self.page + 1].on_touch_up(touch)
if __name__ == '__main__':
from kivy.base import runTouchApp
from kivy.uix.button import Button
pl = PageLayoutVertical()
for i in range(1, 10):
b = Button(text='page%s' % i)
pl.add_widget(b)
runTouchApp(pl)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/51830943
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