如何在 pyqt pyside 中同时运行一个对象的多个实例

Question

下面的代码是一个示例程序，只要单击“新建”按钮，每个选项卡都包含 QWebView 浏览器（在 PyQt/PySide 中使用）和“开始”按钮，当 "Start" 按钮单击浏览器一一加载 3 个站点问题是：当打开多个标签和运行所有标签或多个标签时，所有其他标签暂停加载直到最后一个完成加载然后下一个恢复我想运行他们同时怎么办？

import sys
from PySide.QtGui import *
from PySide.QtCore import *
from PySide.QtWebKit import *


class Main_Gui(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        layout = QVBoxLayout()
        self.bt_new = QPushButton('New')
        self.tabwidget = QTabWidget()
        layout.addWidget(self.tabwidget)
        layout.addWidget(self.bt_new)
        self.setLayout(layout)
        self.bt_new.clicked.connect(self.add_new)

    def add_new(self):
        br = browser()
        self.tabwidget.addTab(br, 'browser')


class browser(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        layout = QVBoxLayout()
        self.br = QWebView()
        self.bt_Start = QPushButton('Start')
        layout.addWidget(self.br)
        layout.addWidget(self.bt_Start)
        self.setLayout(layout)
        self.bt_Start.clicked.connect(self.start_load)

    def start_load(self):
        self.th = QThread()
        self.th.started.connect(self.load)
        self.th.start()

    def load(self):
        sites = ['https://mayaposch.wordpress.com/2011/11/01/how-to-really-truly-use-qthreads-the-full-explanation/'
            , 'http://www.codecademy.com/tracks/python', 'http://www.google.com']
        for i in sites:
            self.br.load(QUrl(i))
            self.sleep(20)

    def sleep(self, seconds):
        end = QTime.addSecs(QTime.currentTime(), seconds)
        while end > QTime.currentTime():
            QCoreApplication.processEvents()


app = QApplication(sys.argv)
win = Main_Gui()
win.resize(800, 600)
win.show()
sys.exit(app.exec_())

Answer 1

您没有为 QThread 分配任何工作（不要重新实现 run 方法）。 browser.load 插槽，您已使用 th.started 信号连接，在主线程中执行（因为您的浏览器是在其中创建的）。这会导致您的问题。

此外，您只能从主线程更改 GUI（例如调用 self.br.load 方法）（为了线程安全）。

class TimerThread(QThread):
    nextURL = pyqtSignal(str)

    def run(self):
        sites = ['https://mayaposch.wordpress.com/2011/11/01/how-to-really-truly-use-qthreads-the-full-explanation/',
                 'http://www.codecademy.com/tracks/python', 'http://www.google.com']
        for url in sites:
            print(self.thread(), url)
            self.nextURL.emit(url)
            self.sleep(10)


class browser(QWidget):
    def __init__(self):
        [...]
        self.th = QThread()

    def start_load(self):
        self.stop_thread(self.th)
        self.th = TimerThread()
        self.th.nextURL.connect(self.load_url_slot)
        self.th.start()

    def load_url_slot(self, url):
        self.br.load(QUrl(url))

    def stop_thread(self, thread):
        thread.terminate()
        if thread.isRunning():
            QCoreApplication.processEvents()

Answer 2

感谢 Alexander，他给了我线索和下面我在问题中提交的示例的完整代码，问题是我想告诉 QThread 等待页面加载，我找到了创建局部变量的解决方案在 QThread 中调用加载并将浏览器 loadFinished 信号连接到函数使加载完成时加载变量为真，在 Qthread 中我编写等待代码直到加载变量变为真

import sys
from PySide.QtGui import *
from PySide.QtCore import *
from PySide.QtWebKit import *
from Browser_AutoPilot import BrowserAutoPilot


class Main_Gui(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        layout = QVBoxLayout()
        self.bt_new = QPushButton('New')
        self.tabwidget = QTabWidget()
        layout.addWidget(self.tabwidget)
        layout.addWidget(self.bt_new)
        self.setLayout(layout)
        self.bt_new.clicked.connect(self.add_new)

    def add_new(self):
        br = browser()
        self.tabwidget.addTab(br, 'browser')


class browser(QWidget):
    load_finished = Signal()

    def __init__(self):
        QWidget.__init__(self)
        layout = QVBoxLayout()
        self.br = BrowserAutoPilot()
        self.bt_Start = QPushButton('Start')
        layout.addWidget(self.br)
        layout.addWidget(self.bt_Start)
        self.setLayout(layout)
        self.th = TimerThread()
        self.bt_Start.clicked.connect(self.start_load)

    def start_load(self):
        self.stop_thread(self.th)

        self.th.nextURL.connect(self.load_url_slot)
        self.br.loadFinished.connect(self.wait_loading)
        self.th.start()

    def load_url_slot(self, url):
        self.br.load(QUrl(url))

    def wait_loading(self):
        self.th.loaded = True

    def stop_thread(self, thread):
        thread.terminate()
        if thread.isRunning():
            QCoreApplication.processEvents()

    def sleep(self, seconds):
        end = QTime.addSecs(QTime.currentTime(), seconds)
        while end > QTime.currentTime():
            QCoreApplication.processEvents()


class TimerThread(QThread):
    nextURL = Signal(str)

    def __init__(self, loaded=False):
        QThread.__init__(self)
        self.loaded = loaded

    def run(self):
        sites = ['https://mayaposch.wordpress.com/2011/11/01/how-to-really-truly-use-qthreads-the-full-explanation/',
                 'http://www.codecademy.com/tracks/python', 'http://www.google.com']

        for url in sites:
            print(self.thread(), url)
            self.nextURL.emit(url)
            self.loaded = False
            while not self.loaded:
                self.sleep(1)

app = QApplication(sys.argv)
win = Main_Gui()
win.resize(800, 600)
win.show()
sys.exit(app.exec_())

如何在 pyqt pyside 中同时 运行 一个对象的多个实例

how to run many instances of an object simultaneously in pyqt pyside

python

pyqt

pyside

qthread

如何在 pyqt pyside 中同时运行一个对象的多个实例