本文介紹了在 Kivy 中加載應用程序時元素的大小不會更新的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
我有 on_size() 事件，它在我調整窗口大小時有效，但我無法使其在應用程序加載時正常工作(它有效，但不是必須的):
I have on_size() event, it works when I resize window, but I can't make it work on application loading correctly (it works, but not like it must):
from random import random, randint
import kivy
kivy.require('1.8.0')
from kivy.config import Config
Config.set('graphics', 'fullscreen', '0')
Config.set('graphics', 'width', 640)
Config.set('graphics', 'height', 480)
Config.set('graphics', 'position', 'custom')
Config.set('graphics', 'top', 40)
Config.set('graphics', 'left', 40)
from kivy.app import App
from kivy.uix.layout import Layout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.graphics import Color, Line, Rectangle
class Main(BoxLayout):
side_padding = 20
def __init__(self, **kwargs):
super(Main, self).__init__(**kwargs)
self.size = (0, 0) # Doesn't help.
self.on_size() # Doesn't help.
def on_size(self, *args):
left, middle, right = self.ids.left, self.ids.middle, self.ids.right
left.width = max([x.texture_size[0] for x in left.children]) + self.side_padding
right.width = max([x.texture_size[0] for x in right.children]) + self.side_padding
available_space = self.width - left.width - right.width
if available_space > self.height:
middle.size = (self.height, self.height)
extra = (self.width - self.height - left.width - right.width) // 2
left.width += extra
right.width += extra
else:
middle.size = (available_space, available_space)
class SidePanel(BoxLayout):
def __init__(self, **kwargs):
super(SidePanel, self).__init__(**kwargs)
class GameField(Layout):
def __init__(self, **kwargs):
super(GameField, self).__init__(**kwargs)
self.array_size = randint(4, 8)
self.bind(pos=self.update, size=self.update)
self.update()
def update(self, *args):
s_padding = 1 / 16
s_sq_size = 1 - 2 * s_padding
self.canvas.clear()
with self.canvas:
block_size = self.width / self.array_size
sq_size = block_size * s_sq_size
padding = block_size * s_padding
Color(1, 1, 1)
for j in range(self.array_size):
for i in range(self.array_size):
Rectangle(pos=(self.x + padding + i * block_size, self.y + padding + j * block_size),
size=(sq_size, sq_size))
for i in range(self.array_size + 1):
shift = self.width * i / self.array_size
Line(points=(self.x, self.y + shift, self.x + self.width, self.y + shift))
Line(points=(self.x + shift, self.y, self.x + shift, self.y + self.height))
def on_touch_up(self, touch):
self.array_size = randint(4, 8)
self.update()
class Application(App):
def build(self):
return Main()
if __name__ == '__main__':
Application().run()
*.kv:
#:kivy 1.8.0
<Main>:
orientation: 'horizontal'
canvas:
Color:
rgb: 1, 1, .9
Rectangle:
pos: self.pos
size: self.size
SidePanel:
id: left
Label:
size_hint_y: None
color: 0, 0, 0, 1
text: 'Score'
Label:
color: 0, 0, 0, 1
text: 'Event log log log loooooooooog'
Label:
color: 0, 0, 0, 1
text: 'Event log log log
123'
Label:
color: 0, 0, 0, 1
text: '35mdbj65 qewr'
Label:
color: 0, 0, 0, 1
text: '3qht6ju7ustju'
GameField:
id: middle
SidePanel:
id: right
Button:
size_hint_y: None
text: 'Menu'
Label:
color: 0, 0, 0, 1
text: 'Bonuses bonuses'
<SidePanel>:
orientation: 'vertical'
size_hint_x: None
size: self.size
<GameField>:
pos_hint: {'center_y': .5}
size_hint: None, None
canvas.before:
Color:
rgb: .9, .9, .9
Rectangle:
pos: self.pos
size: self.size
也許有什么錯誤?
推薦答案
當我根據里面的標簽和按鈕更新班級孩子的大小時，我已經向他們添加了 on_size 事件:
As I update my class's children's sizes depending on labels and buttons inside of it, I've added to them on_size event:
def on_size(self, *args):
self.parent.parent.on_size()
class SideLabel(Label):
on_size = on_size
class SideButton(Button):
on_size = on_size
我還替換了 kv 中這些類的按鈕和標簽.它現在似乎可以正常工作了.
And also I have replaced Buttons and Labels on these classes in kv. It seems to work correctly now.
這篇關于在 Kivy 中加載應用程序時元素的大小不會更新的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！
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