错误

Question

我对python和kivy还是很陌生，我正在尝试在平板电脑上创建简单的绘图应用程序。我想将输出另存为.txt文件，其名称为TextInput（用户名）。（对不起我的英语）

在单击“提交”按钮后，如何使计时器首先启动？

from kivy.app import App
# kivy.require("1.8.0")
from kivy.uix.widget import Widget
from kivy.graphics import Line
from kivy.core.image import Image
from kivy.uix.button import Button

import os
import time

from kivy.config import Config
Config.set('graphics', 'width', '700')
Config.set('graphics', 'height', '700')
Config.write()

from kivy.uix.gridlayout import GridLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.textinput import TextInput
from kivy.uix.label import Label
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivy.properties import ObjectProperty

# changing color to white
from kivy.core.window import Window
from kivy.graphics import Color
Window.clearcolor = (1, 1, 1, 1)
# mode rgba

# Exact date
# now = time.localtime(time.time())
# str(now[3]) + ":" + str(now[4]) + ":" + str(now[5])

class MainScreen(Screen):   

    username = ObjectProperty(None)

    def btn(self):
        x = str(self.username.text)
        print(x)
        return x

class SecondScreen(Screen):
    pass
class AnotherScreen(Screen):
    pass
class ScreenManagement(ScreenManager):
    pass   

class DrawInput(Widget):

    filename = MainScreen().btn

    time_start = time.time()

    def on_touch_down(self, touch):

        # print(touch.spos, touch.pos)
        timing_ms = time.time() - self.time_start

        if os.path.isfile(self.filename+".txt") is True:
            x = open(self.filename+".txt", "a")
            x.write(str(timing_ms) + "\t"
                    + str(touch.spos[0]) + "\t" + str(touch.spos[1]) + "\t" +
                     str(touch.pos[0]) + "\t" + str(touch.pos[1]) + "\t" + "touch" + "\n")
        else: 
            x = open(self.filename+".txt", "w")
            x.write(str(timing_ms) + "\t"
                    + str(touch.spos[0]) + "\t" + str(touch.spos[1]) + "\t" +
                     str(touch.pos[0]) + "\t" + str(touch.pos[1]) + "\t" + "touch" + "\n")              
        with self.canvas:
            Color(0, 0, 0)
            touch.ud["line"] = Line(points = (touch.x, touch.y))



    def on_touch_move(self, touch):

        # print(touch.spos, touch.pos)       
        timing_ms = time.time() - self.time_start

        if os.path.isfile(self.filename+".txt") is True:
            x = open(self.filename+".txt", "a")
            x.write(str(timing_ms) + "\t"
                    + str(touch.spos[0]) + "\t" + str(touch.spos[1]) + "\t" +
                     str(touch.pos[0]) + "\t" + str(touch.pos[1]) + "\t" + "move" + "\n")
        else:
            x = open(self.filename+".txt", "w")         
            x.write(str(timing_ms) + "\t"
                    + str(touch.spos[0]) + "\t" + str(touch.spos[1]) + "\t" +
                     str(touch.pos[0]) + "\t" + str(touch.pos[1]) + "\t" + "move" + "\n")

        touch.ud["line"].points += (touch.x, touch.y)

    def on_touch_up(self, touch):     

        # print("Released!", touch)
        timing_ms = time.time() - self.time_start

        if os.path.isfile(self.filename+".txt") is True:
            x = open(self.filename+".txt", "a")
            x.write(str(timing_ms) + "\t"
                    + str(touch.spos[0]) + "\t" + str(touch.spos[1]) + "\t" +
                     str(touch.pos[0]) + "\t" + str(touch.pos[1]) + "\t" + "released" + "\n")
        else:
            x = open(self.filename+".txt", "w")
            x.write(str(timing_ms) + "\t"
                    + str(touch.spos[0]) + "\t" + str(touch.spos[1]) + "\t" +
                     str(touch.pos[0]) + "\t" + str(touch.pos[1]) + "\t" + "released" + "\n")


presentation = Builder.load_file("applepen.kv")

class ApplePen(App):

    def build(self):
        return presentation

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

# File name: ApplePen.py
#: import FadeTransition kivy.uix.screenmanager.FadeTransition

ScreenManagement:
    transition: FadeTransition()
    MainScreen:
    SecondScreen:
    AnotherScreen:

<MainScreen>:
    name: "main"
    # define global variable username
    username: username

    GridLayout:
        cols:1
        # organise the window
        size: root.width, root.height

        GridLayout:
            cols: 2
            Label: 
                text: "Username: "
                color: 0.5,0.5, 0.5, 1
            TextInput:
                id: username
                multiline: False

        Button:
            color: 0,1,0,1
            font_size: 50
            #size_hint: 0.5, 0.5
            text: "Submit"
            on_press: root.btn()
            on_release: app.root.current = "drawing"


<SecondScreen>:
    name: "drawing"

    FloatLayout:
        DrawInput
        Button:
            color: 0,1,0,1
            font_size: 25
            size_hint: 0.3, 0.3
            text: "finished"
            on_release: app.root.current = "other"


<AnotherScreen>:
    name: "other"
    Button:
        on_press: app.stop()
        text: "Finished"
        font_size: 50

错误：如果os.path.isfile（self.filename +“。txt”）为True： TypeError：+不支持的操作数类型：“方法”和“ str”。我尝试了str（），但是文件名是这样的：绑定方法MainScreen.btn

Answer 1

您可以通过以下操作将以文本输入命名的文件保存为基调：
试试这个例子：

from kivy.app import App
from kivy.lang import Builder


KV = """

BoxLayout:
    TextInput:
        id: ti
    Button:
        text: "Save"
        on_release:
            f = open(ti.text, "w")
            f.close()

"""


class MyApp(App):
    def build(self):
        return Builder.load_string(KV)


MyApp().run()

Answer 2

问题出在body { margin: 0; } div { height: 100vh; overflow: hidden; } div:after { content: ''; display: block; width: 400vw; height: 400vh; background: linear-gradient(-45deg, #EE7752, #E73C7E, #23A6D5, #23D5AB); animation: gradient 15s ease infinite; } @keyframes gradient { 50% { transform: translate(-300vw, -300vh); } }中，因为这是一种方法。我想您需要使用<div></div>

Answer 3

错误

 if os.path.isfile(self.filename + ".txt") is True:
TypeError：+不支持的操作数类型：“方法”和“ str”

根本原因

代码filename = MainScreen().btn实例化了MainScreen的另一个新实例，并指向方法btn()。此新实例与kv文件中实例化的实例MainScreen:不同。因此，分配给self.filename的值为method MainScreen.btn，其类型为class method。

解决方案

有两种解决方法。

方法1

Py文件

为import添加StringProperty语句
在class DrawInput()中，将filename = MainScreen().btn替换为filename = StringProperty('')

片段-py

from kivy.properties import ObjectProperty, StringProperty
...
class DrawInput(Widget):
    filename = StringProperty('')

kv文件

将id: main添加到实例化的小部件MainScreen:
将id: drawing添加到实例化的小部件DrawInput:
添加on_pre_enter事件以初始化filename

片段-KV

ScreenManagement:
    transition: FadeTransition()
    MainScreen:
        id: main
    SecondScreen:
    AnotherScreen:
...
<SecondScreen>:
    name: "drawing"
    on_pre_enter:
        self.ids.drawing.filename = self.manager.ids.main.username.text

    FloatLayout:
        DrawInput:
            id: drawing

方法2

使用以下各项的组合：

使用App.get_running_app()获取app对象
使用root.get_screen('main')获取MainScreen对象
使用username.text提取TextInput的文本

摘要

def on_touch_down(self, touch):
    self.filename = App.get_running_app().root.get_screen('main').username.text

注意-加载kv文件

在您的Kivy应用程序中，尝试不要同时使用两种方法加载 kv 文件，即，按名称约定加载和通过Builder加载。仅使用一种方法。

Kivy Language » How to load KV

有两种方法可以将Kv代码加载到您的应用程序中：

按名称惯例：

Kivy用小写字母查找与您的App类同名的Kv文件，如果以“ App”结尾的“ App”则减“ App”，例如：

ApplePenApp -> applepen.kv

或

ApplePen -> applepen.kv

如果此文件定义了 Root Widget ，它将被附加到应用程序的 root 属性中，并用作应用程序小部件树的基础。

按照构建器惯例：

您可以告诉Kivy直接加载字符串或文件。如果此字符串或文件定义了根窗口小部件，则它将由以下方法返回：

Builder.load_file('path/to/file.kv')

或：

Builder.load_string(kv_string)

摘要-Py

class ApplePen(App):
    pass


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

使用来自TextInput的名称保存file.txt

3 个答案:

错误