Question

在下面的代码中一个示例程序，您可以在单击＆＃34时打开新选项卡;新＆＃34;按钮和每个选项卡包含QWebView浏览器（在PyQt / PySide中使用）和＆＃34;开始＆＃34;按钮，当＆＃34;开始＆＃34;按钮单击浏览器逐个加载3个站点问题是：当打开多个选项卡并运行所有选项卡或多个选项卡时，所有其他选项卡将暂停加载，直到最后一个选项卡完成加载，然后下一个恢复我想同时运行它们怎么样？

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）。您已与browser.load信号相关联的th.started广告位在主广告代码中执行（因为您的浏览器是在其中创建的）。这会导致你的问题。

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

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，以及我在问题中提交的示例的完整代码，问题是我想告诉QThread要等到页面加载，我找到了一个解决方案，使一个名为loaded的局部变量在QThread中连接浏览器loadFinished信号到函数使加载变量为true时加载完成，在Qthread中我做了等待代码，直到加载var变为true

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中同时运行多个对象实例

2 个答案: