[英]Python signals and slots between classes
我正在尝试在Python / PyQt中获得一个Gui应用程序,以使它具有一个slideDialogDialog类通过信号将缩放器列表发送到MainWindow并发出....,但是以下代码不起作用。 滑块会更改值...但是MainWindow看不到信号,我认为发出该信号会通知MainWindow。 但不是。 救命? 哦-我知道我没有设置传递定标器的值,但是由于信号不起作用,所以不这样做。
from PyQt4 import QtCore
from PyQt4 import QtGui
OFFSET_Y = 15
OFFSET_X = 5
SPACER_Y = 20
SPACER_X = 50
switch = [1.0, 2.0, 3.0, 6.0, 9.0, 12.0, 18.0]
class MainWindow(QtGui.QMainWindow):
sliderUpdate = QtCore.SIGNAL('sliderUpdate()')
def __init__(self):
super(MainWindow, self).__init__()
sdlg = SliderDialog(self, 5)
sdlg.connect(self, QtCore.SIGNAL('sliderUpdate'), self.scalers)
sdlg.show()
def scalers(self) :
print "In scalers of MainWindow!"
class SliderDialog(QtGui.QDialog) :
sliderMoved = QtCore.pyqtSignal()
def __init__( self, parent, dataCount ) :
super(SliderDialog, self).__init__(parent)
sliderLayout = QtGui.QVBoxLayout()
sliderLayout.addStretch()
self.slider = []
self.sliderLabel = []
for i in range(dataCount) :
s = QtGui.QSlider(QtCore.Qt.Horizontal, self)
s.setMinimum(0)
s.setMaximum(len(switch)-1)
s.setTickInterval(1)
s.setSingleStep(1)
s.move(170, OFFSET_Y+30 + 3*SPACER_Y*i)
s.sliderReleased.connect(self.sliderMoved)
sl = QtGui.QLabel("Scaling to : 1.0", self)
sl.move(5, OFFSET_Y+30 + 3*SPACER_Y*i)
self.slider.append(s)
self.sliderLabel.append(sl)
sliderLayout.addWidget(self.slider[i])
sliderLayout.addWidget(self.sliderLabel[i])
def sliderMoved(self) :
for i, slides in enumerate(self.slider) :
scaler = slides.sliderPosition()
self.sliderLabel[i].setText("Scaling to: {}".format(switch[scaler]))
self.emit(QtCore.SIGNAL('sliderUpdate'))
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
问题是您的put参数' connect
'错误;
bool QObject.connect (QObject, SIGNAL(), callable, Qt.ConnectionType = Qt.AutoConnection)
参数:
1. QObject : Source object to receive emit signal
2. SIGNAL() : Signal name
3. callable : Callable do your want go it then have signal from source object
4. (Optional)
要修复它们,请在正确的位置更改正确的参数。
从;
sdlg.connect(self, QtCore.SIGNAL('sliderUpdate'), self.scalers)
至;
self.connect(sdlg, QtCore.SIGNAL('sliderUpdate'), self.scalers)
参考 : http : //pyqt.sourceforge.net/Docs/PyQt4/qobject.html#connect-2
最后编辑18/8/2014 11:37 :添加完整代码;
from PyQt4 import QtCore
from PyQt4 import QtGui
OFFSET_Y = 15
OFFSET_X = 5
SPACER_Y = 20
SPACER_X = 50
switch = [1.0, 2.0, 3.0, 6.0, 9.0, 12.0, 18.0]
class MainWindow(QtGui.QMainWindow):
sliderUpdate = QtCore.SIGNAL('sliderUpdate()')
def __init__(self):
super(MainWindow, self).__init__()
sdlg = SliderDialog(self, 5)
self.connect(sdlg, QtCore.SIGNAL('sliderUpdate'), self.scalers)
sdlg.show()
def scalers(self) :
print "In scalers of MainWindow!"
class SliderDialog(QtGui.QDialog) :
sliderMoved = QtCore.pyqtSignal()
def __init__( self, parent, dataCount ) :
super(SliderDialog, self).__init__(parent)
sliderLayout = QtGui.QVBoxLayout()
sliderLayout.addStretch()
self.slider = []
self.sliderLabel = []
for i in range(dataCount) :
s = QtGui.QSlider(QtCore.Qt.Horizontal, self)
s.setMinimum(0)
s.setMaximum(len(switch)-1)
s.setTickInterval(1)
s.setSingleStep(1)
s.move(170, OFFSET_Y+30 + 3*SPACER_Y*i)
s.sliderReleased.connect(self.sliderMoved)
sl = QtGui.QLabel("Scaling to : 1.0", self)
sl.move(5, OFFSET_Y+30 + 3*SPACER_Y*i)
self.slider.append(s)
self.sliderLabel.append(sl)
sliderLayout.addWidget(self.slider[i])
sliderLayout.addWidget(self.sliderLabel[i])
def sliderMoved(self) :
for i, slides in enumerate(self.slider) :
scaler = slides.sliderPosition()
self.sliderLabel[i].setText("Scaling to: {}".format(switch[scaler]))
self.emit(QtCore.SIGNAL('sliderUpdate'))
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
问候,
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