PyQT4.11
Python 2.7
我一直在尝试创建初始屏幕,以在选择特定选项卡时显示加载消息。调用app.processEvents()
时,显示的是灰色框而不是图像,但是如果在调用第一个函数后添加第二个app.processEvents()
,则将显示正确的图像,直到启动完成时为止。
我一直在尝试睡眠定时器,重新粉刷,更新,关闭和重新显示选项卡和Tabwidget以及混合结果,在极少数情况下它会起作用,但更多时候不会起作用。谁能阐明我所缺少的东西吗?
import sys
from PyQt4 import QtCore, QtGui
class splashTest(QtGui.QDialog):
def __init__(self, parent=None):
super(splashTest, self).__init__(parent)
self.setGeometry(000,000,800,400)
self.tabWidget = QtGui.QTabWidget(self)
self.tabWidget.setGeometry(QtCore.QRect(0, 0, 500, 500))
self.tabWidget.setObjectName("tabWidget")
self.tab1 = QtGui.QWidget()
self.tab2 = QtGui.QWidget()
self.tab3 = QtGui.QWidget()
self.tabWidget.addTab(self.tab1, "tab1")
self.tabWidget.addTab(self.tab2, "tab2")
self.tabWidget.addTab(self.tab3, "Click Me")
self.tabWidget.setCurrentIndex(1)
self.tabWidget.currentChanged.connect(self.whichTabIsSelected)
def whichTabIsSelected(self):
if self.tabWidget.currentIndex() == 2:
splash_pix = QtGui.QPixmap('splash.png')
splash = QtGui.QSplashScreen(splash_pix, QtCore.Qt.WindowStaysOnTopHint)
splash.setMask(splash_pix.mask())
splash.show()
app.processEvents()
self.timeConsumingFunction()
app.processEvents()
self.timeConsumingFunction()
splash.finish(self.tabWidget)
else:
pass
def timeConsumingFunction(self):
b = 0
for a in range(100000000):
b += a
print (b)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
myapp = splashTest()
myapp.show()
sys.exit(app.exec_())
最佳答案
问题在于您正在阻止线程的GUI的主线程中运行繁重的任务,这将导致窗口冻结,并且您正在使用QApplication::processEvents()
强制进行更新,相反,正确的解决方案是执行该任务在另一个线程上很重。
import sys
from PyQt4 import QtCore, QtGui
import threading
class splashTest(QtGui.QDialog):
finished = QtCore.pyqtSignal()
def __init__(self, parent=None):
super(splashTest, self).__init__(parent)
self.setGeometry(000,000,800,400)
self.tabWidget = QtGui.QTabWidget(self)
self.tabWidget.setGeometry(QtCore.QRect(0, 0, 500, 500))
self.tabWidget.setObjectName("tabWidget")
self.tab1 = QtGui.QWidget()
self.tab2 = QtGui.QWidget()
self.tab3 = QtGui.QWidget()
self.tabWidget.addTab(self.tab1, "tab1")
self.tabWidget.addTab(self.tab2, "tab2")
self.tabWidget.addTab(self.tab3, "Click Me")
self.tabWidget.setCurrentIndex(1)
self.tabWidget.currentChanged.connect(self.whichTabIsSelected)
@QtCore.pyqtSlot(int)
def whichTabIsSelected(self, index):
if index == 2:
splash_pix = QtGui.QPixmap('splash.png')
splash = QtGui.QSplashScreen(self, splash_pix, QtCore.Qt.WindowStaysOnTopHint)
splash.setMask(splash_pix.mask())
splash.show()
for _ in range(2):
loop = QtCore.QEventLoop()
self.finished.connect(loop.quit)
threading.Thread(target=self.timeConsumingFunction).start()
loop.exec_()
splash.finish(self.tabWidget)
splash.close()
def timeConsumingFunction(self):
b = 0
for a in range(100000000):
b += a
print (b)
self.finished.emit()
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
myapp = splashTest()
myapp.show()
sys.exit(app.exec_())
关于python - 在两次调用app.processEvents()之前,qsplashscreen无法正确显示,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/54267692/