Kivy

Question

问题很简单，让 Kivy 将 Timer1 代码作为标签集成到 FloatLayout。

我有这个 .py 文件：

import kivy

kivy.require('1.10.0')

from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.image import Image
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.stacklayout import StackLayout
from kivy.clock import Clock
from kivy.properties import StringProperty, NumericProperty, ObjectProperty
from digitalclock import DigitalClock
from kivy.animation import Animation

import time


class IntroScreen(Screen):
    pass


class ContScreen(Screen):
    pass


class ScreenManagement(ScreenManager):
    pass


backbone = Builder.load_file("main.kv")


class Status(FloatLayout):
    _change = StringProperty()
    _tnd = ObjectProperty(None)

    def update(self, *args):
        self.time = time.asctime()
        self._change = str(self.time)
        self._tnd.text = str(self.time)
        print (self._change)


class Timer1(Label):
    a = NumericProperty(10)  # seconds
    color = 1, 1, 1, 1
    font_size = 50

    def start(self):
        Animation.cancel_all(self)  # stop any current animations
        self.anim = Animation(a=0, duration=self.a)

        def finish_callback(animation, incr_crude_clock):
            incr_crude_clock.text = "COOL"
        self.anim.bind(on_complete=finish_callback)
        self.anim.start(self)

    def on_a(self, instance, value):
        self.text = str(round(value, 1))


class XGApp(App):
    time = StringProperty()

    def update(self, *args):
        self.time = str(time.asctime())

    def build (self):
        Clock.schedule_interval(self.update, 1)
        t1 = Timer1()
        return backbone


xApp = XGApp()

if __name__ == "__main__":
    xApp.run()

和.kv:

<ContScreen>:
    DigitalClock:
        pos_hint: {'center_x': 0.1, 'center_y': 0.9}
        size_hint: (0.075, 0.075)

    StackLayout
        orientation: "tb-rl"
        spacing: 15

        Button:
            text: "1"
            size_hint: None, .16
            width: 225
            on_press:
                self.background_color = (1.7, 0, 1.7, 1)
                t1.start()

我正在尝试将 Timer1 方面作为 .kv 上 FloatLayout 中的标签，它在触发按钮时出现。目前，我得到的是作为全屏标签的 Timer1。

请帮忙！

Answer 1

使其工作的一种方法是让 Button 创建计时器。首先将 start_timer() 方法添加到 ContScreen class:

class ContScreen(Screen):
    def start_timer(self, *args):
        timer = Timer1(size_hint=(0.2, 0.2))
        self.add_widget(timer)
        timer.start()

要使其生效，请进行其他三项更改：

更改您的 main.kv 文件以制作根小部件（消除 ContScreen 周围的 <>）。
更改 .kv 文件中按钮的 on_press，将 t1.start() 替换为 root.start_timer()。
从 XGApp class 中的 build 方法中删除 t1 = Timer1() 语句。

另一种方法是在 .kv 文件中创建 Timer1，然后在按下 Button 时启动它运行。为此，请更改您的 .kv 文件以包含 Timer:

ContScreen:
    DigitalClock:
        pos_hint: {'center_x': 0.1, 'center_y': 0.9}
        size_hint: (0.075, 0.075)

    StackLayout
        orientation: "tb-rl"
        spacing: 15

        Button:
            text: "1"
            size_hint: None, .16
            width: 225
            on_press:
                self.background_color = (1.7, 0, 1.7, 1)
                timer.start()

        Timer1:
            id: timer
            text: '0.0'
            size_hint: (0.2, 0.2)

将您的 backbone = Builder.load_file("main.kv") 移动到 Timer1 class 的定义之后。并将 ContScreen class 改回：

class ContScreen(Screen):
    pass

Answer 2

解决方案

将定时器标签的设计视图从 Python 代码移动到 kv 文件中。
为classTimer添加构造函数并接受参数，root, instance, duration, bg_colour
在kv文件中，实例化Timer[=38时传递参数root（屏幕'cont'）、按钮实例、持续时间、背景颜色 =]

在 build 方法中，删除 t1 = Timer1()

例子

main.py

import kivy kivy.require('1.11.0') from kivy.app import App from kivy.lang import Builder from kivy.uix.screenmanager import ScreenManager, Screen from kivy.uix.label import Label from kivy.uix.floatlayout import FloatLayout from kivy.clock import Clock from kivy.properties import StringProperty, NumericProperty, ObjectProperty from kivy.animation import Animation import time class IntroScreen(Screen): pass class ContScreen(Screen): pass class ScreenManagement(ScreenManager): pass class Status(FloatLayout): _change = StringProperty() _tnd = ObjectProperty(None) def update(self, *args): self.time = time.asctime() self._change = str(self.time) self._tnd.text = str(self.time) print (self._change) class Timer(Label): a = NumericProperty() # seconds def __init__(self, root, instance, duration, bg_colour, **kwargs): super(Timer, self).__init__(**kwargs) self.obj = instance self.a = duration self.root = root self.obj.disabled = True # disable widget/button self.obj.background_color = bg_colour self.root.add_widget(self) # add Timer/Label widget to screen, 'cont' def animation_complete(self, animation, widget): self.root.remove_widget(widget) # remove Timer/Label widget to screen, 'cont' self.obj.background_color = [1, 1, 1, 1] # reset to default colour self.obj.disabled = False # enable widget/button def start(self): Animation.cancel_all(self) # stop any current animations self.anim = Animation(a=0, duration=self.a) self.anim.bind(on_complete=self.animation_complete) self.anim.start(self) def on_a(self, instance, value): self.text = str(round(value, 1)) class XGApp(App): time = StringProperty() def update(self, *args): self.time = str(time.asctime()) def build (self): Clock.schedule_interval(self.update, 1) return Builder.load_file("main.kv") if __name__ == "__main__": XGApp().run()

kv文件

#:import DigitalClock digitalclock #:import Timer main.Timer <ContScreen>: DigitalClock: pos_hint: {'center_x': 0.1, 'center_y': 0.9} size_hint: (0.075, 0.075) StackLayout orientation: "tb-rl" spacing: 15 Button: text: "1" size_hint: None, .16 width: 225 on_press: Timer(root, self, 5, [0.17, 1.7, 0, 1]).start() Button: text: "2" size_hint: None, .16 width: 225 on_press: Timer(root, self, 10, [1.7, 0, 1.7, 1]).start() <Timer>: canvas.before: Color: rgba: 0, 0, 0.5, 1 # 50% blue Rectangle: size: self.size pos: self.pos size_hint: 0.3, .1 font_size: 50 pos_hint: {'center_x': 0.5, 'center_y': 0.5}

输出

Kivy - FloatLayout 中的定时器集成

Kivy - Timer Integration in FloatLayout

python

layout

timer

kivy-language

解决方案

例子

main.py

kv文件

输出