問題描述

我正在為我開發的命令行實用程序編寫 Kivy UI.一切正常，但有些進程可能需要幾秒鐘到幾分鐘的時間來處理，我想向用戶提供一些指示，表明該進程正在運行.理想情況下，這將是一個旋轉輪或加載欄或其他東西的形式，但即使我可以更新我的顯示以向用戶顯示一個進程正在運行，它也會比我現在擁有的更好.

I am writing a Kivy UI for cmd line utility I have developed. Everything works fine, but some of the processes can take from a few seconds to a few minutes to process and I would like to provide some indication to the user that the process is running. Ideally, this would be in the form of a spinning wheel or loading bar or something, but even if I could update my display to show the user that a process is running, it would be better than what I have now.

目前，用戶在主 UI 中按下按鈕.這會彈出一個彈出窗口，向用戶驗證一些關鍵信息，如果他們對這些選項感到滿意，他們會按下運行"按鈕.我已經嘗試打開一個新的彈出窗口來告訴他們進程正在運行，但是因為在進程完成之前顯示不會更新，所以這不起作用.

Currently, the user presses a button in the main UI. This brings up a popup that verifies some key information with the user, and if they are happy with those options, they press a 'run' button. I have tried opening a new popup to tell them that the process is running, but because the display doesn't update until the process finishes, this doesn't work.

我有很多編碼經驗，但主要是在數學和工程方面，所以我對 UI 設計和處理事件和線程非常陌生.一個簡單的獨立示例將不勝感激.

I have a lot of coding experience, but mostly in the context of math and engineering, so I am very new to the designing of UIs and having to handle events and threads. A simple self-contained example would be greatly appreciated.

推薦答案

我最近正在解決你描述的問題:顯示在進程完成之前不會更新

I was recently tackling the problem you described: display doesn't update until the process finishes

這是我在#Kivy IRC 頻道中@andy_s 的幫助下完成的一個完整示例:

Here is a complete example that I got working with the help of @andy_s in the #Kivy IRC channel:

我的 main.py:

My main.py:

from kivy.app import App
from kivy.uix.popup import Popup
from kivy.factory import Factory
from kivy.properties import ObjectProperty
from kivy.clock import Clock

import time, threading

class PopupBox(Popup):
    pop_up_text = ObjectProperty()
    def update_pop_up_text(self, p_message):
        self.pop_up_text.text = p_message

class ExampleApp(App):
    def show_popup(self):
        self.pop_up = Factory.PopupBox()
        self.pop_up.update_pop_up_text('Running some task...')
        self.pop_up.open()

    def process_button_click(self):
        # Open the pop up
        self.show_popup()

        # Call some method that may take a while to run.
        # I'm using a thread to simulate this
        mythread = threading.Thread(target=self.something_that_takes_5_seconds_to_run)
        mythread.start()

    def something_that_takes_5_seconds_to_run(self):
        thistime = time.time() 
        while thistime + 5 > time.time(): # 5 seconds
            time.sleep(1)

        # Once the long running task is done, close the pop up.
        self.pop_up.dismiss()

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

我的例子.kv:

AnchorLayout:
    anchor_x: 'center'
    anchor_y: 'center'
    Button:
        height: 40
        width: 100
        size_hint: (None, None)
        text: 'Click Me'
        on_press: app.process_button_click()

<PopupBox>:
    pop_up_text: _pop_up_text
    size_hint: .5, .5
    auto_dismiss: True
    title: 'Status'   

    BoxLayout:
        orientation: "vertical"
        Label:
            id: _pop_up_text
            text: ''

如果你運行這個例子，你可以點擊Click Me按鈕，它應該會打開一個模態/彈窗形式的進度條".此彈出窗口將保持打開 5 秒鐘而不會阻塞主窗口.5秒后，彈窗會自動消失.

If you run this example, you can click the Click Me button, which should open up a "progress bar" in the form of a modal/pop-up. This pop up will remain open for 5 seconds without blocking the main window. After 5 seconds, the pop up will automatically be dismissed.

這篇關于在 Kivy 中構建簡單的進度條或加載動畫?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！