use*_*437 6 python pyqt progress pyqt4
我正在尝试编写一个脚本,在执行任务时会显示忙碌指示.当任务结束时,进度条将填充到最后,表明100%任务已完成.我只是想让进度条显示正在进行的任务.但是当我开始任务时,忙碌指示停止.在我看来,指示和任务不能一起继续.请帮我.这是我的代码:
from PyQt4 import QtCore, QtGui
from time import sleep
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(344, 159)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.pb = QtGui.QProgressBar(self.centralwidget)
self.pb.setGeometry(QtCore.QRect(20, 20, 301, 31))
self.pb.setProperty("value", 0)
self.pb.setObjectName(_fromUtf8("pb"))
self.btn = QtGui.QPushButton(self.centralwidget)
self.btn.setGeometry(QtCore.QRect(20, 70, 98, 27))
self.btn.setObjectName(_fromUtf8("btn"))
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtGui.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 344, 25))
self.menubar.setObjectName(_fromUtf8("menubar"))
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtGui.QStatusBar(MainWindow)
self.statusbar.setObjectName(_fromUtf8("statusbar"))
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QObject.connect(self.btn, QtCore.SIGNAL(_fromUtf8("clicked()")), self.action)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def action(self):
self.pb.setRange(0, 0)
sleep(3) # Here I want to run a command.For example: os.system('copy something')
self.pb.setRange(0, 100)
self.pb.setValue(100)
QtGui.qApp.processEvents()
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
self.btn.setText(_translate("MainWindow", "Start", None))
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
MainWindow = QtGui.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
Yoa*_*ann 26
首先,直接编辑用QtDesigner创建的代码是个坏主意.您可能已# WARNING! All changes made in this file will be lost!在文档顶部看到该行.对于这样一个简单的小部件,您最好使用手动编码.
其次,仔细看看action插槽实际上做了什么.
def action(self):
self.pb.setRange(0, 0) # Un
sleep(3) # <-- Your slot blocks HERE
self.pb.setRange(0, 100)
self.pb.setValue(100)
QtGui.qApp.processEvents()
您的progressBar没有理由在您的广告位被阻止时更新其值sleep.当action被调用时,所述槽线程休眠3秒然后设置进度条整整100.
您不能指望progressBar在您的任务运行时神奇地更新自己.如果您不知道需要多长时间并且无法分步进行细分,则应考虑使用脉冲 ProgressBar(参见下面的示例1).如果您可以轻松地完成任务的进展(比如复制n个文件),则应相应地更新progressBar的值.
无论哪种方式,您都应该使用QThread非阻塞行为,并signals在您的线程和主应用程序之间进行通信.
示例1 - Pulse ProgressBar:
如果最小值和最大值均设置为0,则进度条将显示忙碌指示符而不是步骤百分比.
class MyCustomWidget(QtGui.QWidget):
def __init__(self, parent=None):
super(MyCustomWidget, self).__init__(parent)
layout = QtGui.QVBoxLayout(self)
# Create a progress bar and a button and add them to the main layout
self.progressBar = QtGui.QProgressBar(self)
self.progressBar.setRange(0,1)
layout.addWidget(self.progressBar)
button = QtGui.QPushButton("Start", self)
layout.addWidget(button)
button.clicked.connect(self.onStart)
self.myLongTask = TaskThread()
self.myLongTask.taskFinished.connect(self.onFinished)
def onStart(self):
self.progressBar.setRange(0,0)
self.myLongTask.start()
def onFinished(self):
# Stop the pulsation
self.progressBar.setRange(0,1)
class TaskThread(QtCore.QThread):
taskFinished = QtCore.pyqtSignal()
def run(self):
time.sleep(3)
self.taskFinished.emit()
示例2 - Classic ProgressBar:
class MyCustomWidget(QtGui.QWidget):
def __init__(self, parent=None):
super(MyCustomWidget, self).__init__(parent)
layout = QtGui.QVBoxLayout(self)
self.progressBar = QtGui.QProgressBar(self)
self.progressBar.setRange(0,100)
button = QtGui.QPushButton("Start", self)
layout.addWidget(self.progressBar)
layout.addWidget(button)
button.clicked.connect(self.onStart)
self.myLongTask = TaskThread()
self.myLongTask.notifyProgress.connect(self.onProgress)
def onStart(self):
self.myLongTask.start()
def onProgress(self, i):
self.progressBar.setValue(i)
class TaskThread(QtCore.QThread):
notifyProgress = QtCore.pyqtSignal(int)
def run(self):
for i in range(101):
self.notifyProgress.emit(i)
time.sleep(0.1)
最后我得到了我想要的东西，虽然需要一点点编辑。我刚刚将此行添加到 onFinished(): self.progressBar.setValue(1) 以确认 100% 任务完成。这是代码：
from PyQt4 import QtCore, QtGui
from time import sleep
import sys, os
class MyCustomWidget(QtGui.QWidget):
def __init__(self, parent=None):
super(MyCustomWidget, self).__init__(parent)
layout = QtGui.QVBoxLayout(self)
# Create a progress bar and a button and add them to the main layout
self.progressBar = QtGui.QProgressBar(self)
self.progressBar.setRange(0,1)
layout.addWidget(self.progressBar)
button = QtGui.QPushButton("Start", self)
layout.addWidget(button)
button.clicked.connect(self.onStart)
self.myLongTask = TaskThread()
self.myLongTask.taskFinished.connect(self.onFinished)
def onStart(self):
self.progressBar.setRange(0,0)
self.myLongTask.start()
def onFinished(self):
# Stop the pulsation
self.progressBar.setRange(0,1)
self.progressBar.setValue(1)
class TaskThread(QtCore.QThread):
taskFinished = QtCore.pyqtSignal()
def run(self):
os.system('sudo apt-get install leafpad')
self.taskFinished.emit()
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
window = MyCustomWidget()
window.resize(640, 480)
window.show()
sys.exit(app.exec_())