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python - 如何每 60 秒更新一次 PyQt5 图标？

问题描述

我是 python 新手，我正在做一个简单的应用程序，其中比特币的价值显示在系统托盘中。我正在使用 PyQt5。

我的问题是：如何每分钟刷新一次值和图标。当我尝试它时，我的菜单将不再起作用。有简单的解决方法吗？

这是我的代码：

import sys
import time
import math
import json

from PyQt5.QtWidgets import QApplication, QSystemTrayIcon, QMenu
from PyQt5.QtGui import QIcon
from urllib.request import urlopen
from time import sleep

app = QApplication(sys.argv)

while True:
    # Connecting the api
    with urlopen("https://api.alternative.me/v2/ticker/1/") as response:
        source = response.read()

data = json.loads(source)

price = (json.dumps(data['data']['1']['quotes']['USD']['price']))
change = (json.dumps(data['data']['1']['quotes']['USD']['percentage_change_1h']))

intPrice = float(price)
intChange = float(change)

roundPrice = round(intPrice,2)
roundStringPrice = str(roundPrice)

# Icon change
if intChange <=0.00:
    trayIcon = QSystemTrayIcon(QIcon('icons/down.png'), parent=app)
else:
    trayIcon = QSystemTrayIcon(QIcon('icons/up.png'), parent=app)
    
trayIcon.setToolTip(roundStringPrice + ' USD')
trayIcon.show()
time.sleep(5)
trayIcon.update()

menu = QMenu()
exitAction = menu.addAction('Quit app')
exitAction.triggered.connect(app.quit)

trayIcon.setContextMenu(menu)
sys.exit(app.exec_())

标签： pythonapipyqt5

解决方案

不要使用 while True、urlopen 或 time.sleep，因为它们会阻塞事件循环，而是使用带有 QNetworkAccessManager 的 QTimer：

import os.path
import json

from functools import cached_property

from PyQt5.QtCore import pyqtSignal, QObject, QTimer, QUrl
from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkReply, QNetworkRequest
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import QApplication, QMenu, QMessageBox, QSystemTrayIcon

CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))


class ApiManager(QObject):
    infoChanged = pyqtSignal(float, float)

    def __init__(self, parent=None):
        super().__init__(parent)
        self.manager.finished.connect(self.handle_finished)

    @cached_property
    def manager(self):
        return QNetworkAccessManager()

    def start_request(self):
        url = QUrl("https://api.alternative.me/v2/ticker/1/")
        qrequest = QNetworkRequest(url)
        self.manager.get(qrequest)

    def handle_finished(self, reply):
        if reply.error() != QNetworkReply.NoError:
            print(f"code: {reply.error()} message: {reply.errorString()}")
        else:
            print("successful")
            source = reply.readAll().data()
            data = json.loads(source)
            r = data["data"]["1"]["quotes"]["USD"]
            price = r["price"]
            change = r["percentage_change_1h"]
            self.infoChanged.emit(price, change)


class SystemTrayIcon(QSystemTrayIcon):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setIcon(QIcon(self.get_resource("icons/up.png")))

        self.menu = QMenu()
        exitAction = self.menu.addAction("Quit app")
        exitAction.triggered.connect(QApplication.quit)
        self.setContextMenu(self.menu)

        self.manager = ApiManager()
        self.manager.infoChanged.connect(self.handle_info_changed)
        timer = QTimer(self, timeout=self.manager.start_request, interval=60 * 1000)
        timer.start()
        self.manager.start_request()

    def get_resource(self, path):
        return os.path.join(CURRENT_DIR, path)

    def handle_info_changed(self, price, change):
        icon = (
            QIcon(self.get_resource("icons/down.png"))
            if change < 0
            else QIcon(self.get_resource("icons/up.png"))
        )
        self.setIcon(icon)
        self.setToolTip(f"{price:.2f} USD")


if __name__ == "__main__":
    import sys

    app = QApplication(sys.argv)

    if not QSystemTrayIcon.isSystemTrayAvailable():
        QMessageBox.critical(
            None, "Systray", "I couldn't detect any system tray on this system."
        )
        sys.exit(1)
    QApplication.setQuitOnLastWindowClosed(False)

    trayIcon = SystemTrayIcon(parent=app)
    trayIcon.show()
    sys.exit(app.exec_())

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