PYQT5開啟多個執行緒和視窗,多執行緒與多視窗的互動例項
阿新 • • 發佈:2020-01-09
每點選一次按鈕,彈出一個對話方塊(子視窗),同時開啟一個子執行緒來執行任務並更新對話方塊內容,關閉對話方塊則關閉對應子執行緒
1. 建立一個簡單的主介面和一個自定義對話方塊
from PyQt5 import QtCore,QtGui,QtWidgets class Ui_MainWindow(object): def setupUi(self,MainWindow): MainWindow.setObjectName("MainWindow") MainWindow.resize(327,303) self.centralwidget = QtWidgets.QWidget(MainWindow) self.centralwidget.setObjectName("centralwidget") self.gridLayout = QtWidgets.QGridLayout(self.centralwidget) self.gridLayout.setObjectName("gridLayout") spacerItem = QtWidgets.QSpacerItem(40,20,QtWidgets.QSizePolicy.Expanding,QtWidgets.QSizePolicy.Minimum) self.gridLayout.addItem(spacerItem,1,1) self.pushButton = QtWidgets.QPushButton(self.centralwidget) self.pushButton.setObjectName("pushButton") self.gridLayout.addWidget(self.pushButton,1) spacerItem1 = QtWidgets.QSpacerItem(40,QtWidgets.QSizePolicy.Minimum) self.gridLayout.addItem(spacerItem1,2,1) MainWindow.setCentralWidget(self.centralwidget) self.menubar = QtWidgets.QMenuBar(MainWindow) self.menubar.setGeometry(QtCore.QRect(0,327,23)) self.menubar.setObjectName("menubar") MainWindow.setMenuBar(self.menubar) self.statusbar = QtWidgets.QStatusBar(MainWindow) self.statusbar.setObjectName("statusbar") MainWindow.setStatusBar(self.statusbar) self.retranslateUi(MainWindow) self.pushButton.clicked.connect(MainWindow.open_dialog) QtCore.QMetaObject.connectSlotsByName(MainWindow) def retranslateUi(self,MainWindow): _translate = QtCore.QCoreApplication.translate MainWindow.setWindowTitle(_translate("MainWindow","MainWindow")) self.pushButton.setText(_translate("MainWindow","多執行緒彈窗")) class Ui_Dialog(object): def setupUi(self,Dialog): Dialog.setObjectName("Dialog") Dialog.resize(369,128) self.gridLayout = QtWidgets.QGridLayout(Dialog) self.gridLayout.setObjectName("gridLayout") self.buttonBox = QtWidgets.QDialogButtonBox(Dialog) self.buttonBox.setOrientation(QtCore.Qt.Horizontal) self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel|QtWidgets.QDialogButtonBox.Ok) self.buttonBox.setObjectName("buttonBox") self.gridLayout.addWidget(self.buttonBox,1) self.progressBar = QtWidgets.QProgressBar(Dialog) self.progressBar.setProperty("value",24) self.progressBar.setObjectName("progressBar") self.gridLayout.addWidget(self.progressBar,1) self.retranslateUi(Dialog) self.buttonBox.accepted.connect(Dialog.accept) self.buttonBox.rejected.connect(Dialog.reject) QtCore.QMetaObject.connectSlotsByName(Dialog) def retranslateUi(self,Dialog): _translate = QtCore.QCoreApplication.translate Dialog.setWindowTitle(_translate("Dialog","Dialog"))
2. 每點選一次按鈕,開啟一個彈窗
class DialogWindow(QDialog,Ui_Dialog): def __init__(self,parent=None): super(DialogWindow,self).__init__(parent) self.setupUi(self) class MainWindow(QtWidgets.QMainWindow,Ui_MainWindow): def __init__(self,parent=None): super(MainWindow,self).__init__(parent) self.setupUi(self) def open_dialog(self): dialog = DialogWindow(self) dialog.show() if __name__ == "__main__": app = QtWidgets.QApplication(sys.argv) mainWindow = MainWindow() mainWindow.show() sys.exit(app.exec_())
3. 開啟彈窗的同時,開啟一個子執行緒,更新對話方塊中的進度條
在子執行緒定義訊號,關聯對話方塊更新進度條的槽函式
class DialogWindow(QDialog,self).__init__(parent) self.setupUi(self) def update_progressbar(self,p_int): self.progressBar.setValue(p_int) # 更新進度條 class MainWindow(QtWidgets.QMainWindow,self).__init__(parent) self.setupUi(self) self.count = 0 def open_dialog(self): dialog = DialogWindow(self) dialog.show() self.thread = RunThread(self.count) self.count += 1 self.thread.update_pb.connect(dialog.update_progressbar) # 關聯 self.thread.start() class RunThread(QThread): update_pb = pyqtSignal(int) # 定義更新進度條的訊號 def __init__(self,count): super().__init__() self.count = count def run(self): for i in range(100): print('thread%s' % self.count,i,QThread().currentThreadId()) self.update_pb.emit(i) time.sleep(1) pass if __name__ == "__main__": app = QtWidgets.QApplication(sys.argv) mainWindow = MainWindow() mainWindow.show() sys.exit(app.exec_())
4. 關閉對話方塊,則關閉對應子執行緒
在對話方塊中新增自定義訊號,並重寫關閉事件,在關閉視窗時傳送關閉子執行緒的訊號
class DialogWindow(QDialog,Ui_Dialog): stop_thread = pyqtSignal() # 定義關閉子執行緒的訊號 def __init__(self,p_int): self.progressBar.setValue(p_int) def closeEvent(self,event): self.stop_thread.emit() pass class MainWindow(QtWidgets.QMainWindow,self).__init__(parent) self.setupUi(self) self.count = 0 def open_dialog(self): dialog = DialogWindow(self) dialog.show() self.thread = RunThread(self.count) self.count += 1 self.thread.update_pb.connect(dialog.update_progressbar) dialog.stop_thread.connect(self.thread.terminate) self.thread.start() class RunThread(QThread): update_pb = pyqtSignal(int) def __init__(self,count): super().__init__() self.count = count def run(self): for i in range(1,101): print('thread_%s' % self.count,QThread().currentThreadId()) self.update_pb.emit(i) time.sleep(1) pass if __name__ == "__main__": app = QtWidgets.QApplication(sys.argv) mainWindow = MainWindow() mainWindow.show() sys.exit(app.exec_())
5. 使用執行緒池QThreadPool管理子執行緒
使用QThreadPool,執行緒需要繼承QRunnable,而QRunnable只是namespace,沒有繼承QT的訊號機制,
所以需要另外繼承QObject來使用訊號,我這裡直接線上程中使用封裝的訊號向外部傳遞資訊
class DialogWindow(QDialog,self).__init__(parent) self.setupUi(self) self.count = 0 self.pool = QThreadPool() self.pool.globalInstance() self.pool.setMaxThreadCount(10) # 設定最大執行緒數 def open_dialog(self): dialog = DialogWindow(self) dialog.show() thread = RunThread(self.count) self.count += 1 thread.signal.update_pb.connect(dialog.update_progressbar) # dialog.stop_thread.connect(thread.stop) # self.thread.start() self.pool.start(thread) # 執行緒池分配一個執行緒執行該任務 class Signal(QObject): update_pb = pyqtSignal(int) class RunThread(QRunnable): def __init__(self,count): super().__init__() self.count = count self.signal = Signal() # 訊號 def run(self): for i in range(1,QThread().currentThreadId()) self.signal.update_pb.emit(i) time.sleep(1) if __name__ == "__main__": app = QtWidgets.QApplication(sys.argv) mainWindow = MainWindow() mainWindow.show() sys.exit(app.exec_())
QThreadPool沒有釋放正在執行的執行緒的方法
以上這篇PYQT5開啟多個執行緒和視窗,多執行緒與多視窗的互動例項就是小編分享給大家的全部內容了,希望能給大家一個參考,也希望大家多多支援我們。