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。