pysimplegui 讀取塊主線程

Question

我正在嘗試創建一個簡單的 GUI 程序作為自動化腳本的狀態指示器。 GUI 將在后台運行（但可見）並隨着一些數據的處理而更新。 我從 pysimplegui 開始，因為它更容易理解。 但是，我注意到運行 read 會阻塞主線程。 這會導致問題，因為程序應該在需要時處理鍵盤輸入（使用 pynput）。 位於單獨線程上的鍵盤記錄器工作正常，但主線程已停止，因此未進行任何更改。 我該如何解決這個問題，以便 main 像往常一樣運行並且只是偶爾更新 GUI window？

這是我到目前為止編寫的代碼：

main.py

from src.components import gui, logger
from pynput import keyboard


def on_press(key):
    try:
        global start
        start = True
        print('alphanumeric key {0} pressed'.format(
            key.char))
    except AttributeError:
        print('special key {0} pressed'.format(
            key))


if __name__ == "__main__":
    start = False

    listener = keyboard.Listener(on_press=on_press)
    listener.start()

    image_window = gui.create_image_window()
    gui.welcome_window(image_window)

    image_window.read()

    # This does not run. The read() blocks the program here 
    while not start:  
        print("Something")

gui.py

import PySimpleGUI as sg
import base64

icon = base64.b64encode(open('./src/resources/paper-clip.png', 'rb').read())


def create_text_window():
    sg.theme('DarkBlack1')
    layout = [[sg.Text("Example", key="-TEXT-")]]
    return sg.Window(title="Example", layout=layout, resizable=False, size=(500, 300), keep_on_top=True,
                     icon=icon, titlebar_icon=icon, margins=(0,0), element_padding=(0,0), finalize=True)


def create_image_window():
    image = sg.Image(size=(500, 300), key="-IMAGE-")
    layout = [[image]]
    return sg.Window(title="Example", layout=layout, resizable=False, size=(500, 300), keep_on_top=True,
                     icon=icon, titlebar_icon=icon,margins=(0,0), element_padding=(0,0), finalize=True)


def welcome_window(window):
    image = sg.Image("./src/resources/paper-clip.png",size=(500, 300))
    window['-IMAGE-'].update(filename="./src/resources/example.png")
    window.Refresh()

Answer 1

演示線程如何在主線程中使用 GUI 的示例代碼，使用 Window 的方法write_event_value向主線Window事件。

from pynput import keyboard
import PySimpleGUI as sg


def on_press(key, window):
    try:
        global start
        start = True
        print('alphanumeric key {0} pressed'.format(key.char))
    except AttributeError:
        print('special key {0} pressed'.format(key))
    window.write_event_value('KEY', key)

def create_window():
    layout = [[sg.Image(key="-IMAGE-"), sg.Text("Wait the key pressed !", size=25, key='Status')]]
    return sg.Window("Title", layout=layout, finalize=True)

def welcome_window(window):
    window['-IMAGE-'].update(data=sg.EMOJI_BASE64_HAPPY_LAUGH)
    window.Refresh()

start = False

window = create_window()
welcome_window(window)

listener = keyboard.Listener(on_press=lambda key, win=window:on_press(key, win))
listener.start()

while True:

    event, values = window.read()

    if event == sg.WIN_CLOSED:
        break
    elif event == 'KEY':
        key = values[event]
        window['Status'].update(f"'{key}' key pressed !")

listener.stop()
window.close()