带有 Qlabel 和信号槽的 Qcombobox
Qcombobox with Qlabel and signal&slot
我有一个 Qgroupbox，其中包含带有 Qlabel 的 Qcombobox，我想 select 来自 Qcombobox 的值并将该值显示为 Qlabel。我有完整的代码，即使我在函数之前和之后打印值，每件事都可以正常工作，只显示 setText 不会将文本设置为 Qlabel 并更新它。
当前屏幕
我想要的
我已经更正了信号代码，当 Qgroupbox 中的 Qcombobox 出现或值将被更改时，self.activation.connect(......) 将发出索引的 int。为了确保可以工作，我在 def setdatastrength(self, index) 中打印 it-value，请参见下图确实有效，然后将参数传递给函数 self.concreteproperty.display_condata(it) 将被调用并在 self.concreteproperty.display_condata(it) 中打印值 def display_condata(self, value) 确保值传递，如下图所示，它确实有效。这行代码self.con_strength_value.setText(fmt.format(L_Display))
不会为 Qlabel 赋值。
脚本
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class secondtabmaterial(QtWidgets.QWidget):
def __init__(self, parent=None):
super(secondtabmaterial, self).__init__(parent)
self.concretewidgetinfo = ConcreteStrengthInFo()
Concrete_Group = QtWidgets.QGroupBox(self)
Concrete_Group.setTitle("&Concrete")
Concrete_Group.setLayout(self.concretewidgetinfo.grid)
class ConcreteStrengthComboBox(QtWidgets.QComboBox):
def __init__(self, parent = None):
super(ConcreteStrengthComboBox, self).__init__(parent)
self.addItems(["C12/15","C16/20","C20/25","C25/30","C30/37","C35/45"
,"C40/50","C45/55","C50/60","C55/67","C60/75","C70/85",
"C80/95","C90/105"])
self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))
self.compressive_strength = ["12","16","20","25","30","35","40",
"45","50","55","60","70","80","90"]
class ConcreteProperty(QtWidgets.QWidget):
def __init__(self, parent=None):
super(ConcreteProperty, self).__init__(parent)
self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))
concretestrength_lay = QtWidgets.QHBoxLayout(self)
fctd = "\nfcd\n\nfctd\n\nEc"
con_strength = QtWidgets.QLabel(fctd)
self.con_strength_value = QtWidgets.QLabel(" ")
concretestrength_lay.addWidget(con_strength)
concretestrength_lay.addWidget(self.con_strength_value, alignment=QtCore.Qt.AlignRight)
self.setLayout(concretestrength_lay)
@QtCore.pyqtSlot(int)
def display_condata(self, value):
try:
L_Display = str(value)
print("-------- After ------")
print(L_Display, type(L_Display))
fmt = "{}mm"
self.con_strength_value.setText(fmt.format(L_Display))
except ValueError:
print("Error")
class ConcreteStrengthInFo(QtWidgets.QWidget):
def __init__(self, parent=None):
super(ConcreteStrengthInFo, self).__init__(parent)
self.concreteproperty = ConcreteProperty()
self.concretestrengthbox = ConcreteStrengthComboBox()
self.concretestrengthbox.activated.connect(self.setdatastrength)
hbox = QtWidgets.QHBoxLayout()
concrete_strength = QtWidgets.QLabel("Concrete strength: ")
hbox.addWidget(concrete_strength)
hbox.addWidget(self.concretestrengthbox)
self.grid = QtWidgets.QGridLayout()
self.grid.addLayout(hbox, 0, 0)
self.grid.addWidget(self.concreteproperty, 1, 0)
@QtCore.pyqtSlot(int)
def setdatastrength(self, index):
it = self.concretestrengthbox.compressive_strength[index]
self.concreteproperty.display_condata(it)
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
w = secondtabmaterial()
w.show()
sys.exit(app.exec_())
以上代码已更正并最终确定。现在它可以正常工作了。
我认为问题在于您的接收槽与任何可用的 .activated 信号都不匹配。
self.activated.connect(self.setdatastrength)
@QtCore.pyqtSlot()
def setdatastrength(self):
index = self.currentIndex()
it = self.compressive_strength[index]
print(it)
self.concreteproperty.display_condata(it)
QComboBox.activated 信号发出索引的 int 或所选值的 str。 See documentation.
您已将其附加到 setdatastrength，它接受不接受任何参数（除了来自对象的 self）——这意味着它与任何可用的签名都不匹配信号，不会被调用。如果您更新定义以添加索引值，并接受单个 int 它应该可以工作。
self.activated.connect(self.setdatastrength)
@QtCore.pyqtSlot(int) # add the target type for this slot.
def setdatastrength(self, index):
it = self.compressive_strength[index]
print(it)
self.concreteproperty.display_condata(it)
更新后 — 以上问题现在看起来已修复，尽管您不需要 setdatastrength 中的额外 index = self.currentIndex() 它没有任何危害。
查看您的代码，我认为标签 正在更新。问题实际上是您根本看不到标签。查看 ConcreteProperty
的初始化
class ConcreteProperty(QtWidgets.QWidget):
def __init__(self, parent=None):
super(ConcreteProperty, self).__init__(parent)
self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))
self.concretestrength_lay = QtWidgets.QHBoxLayout()
fctd = "\nfcd\n\nfctd\n\nEc"
con_strength = QtWidgets.QLabel(fctd)
self.con_strength_value = QtWidgets.QLabel(" ")
self.concretestrength_lay.addWidget(con_strength)
self.concretestrength_lay.addWidget(self.con_strength_value, alignment=QtCore.Qt.AlignLeft)
更改未出现的原因是您创建了 两个 ConcreteProperty 个对象，一个在 ConcreteStrengthInfo 中，一个在 ConcreteStrengthComboBox 中。组合框的更新会触发附加到组合框的 ConcreteProperty 的更新，而不是另一个（它们是单独的对象）。可见 ConcreteProperty 不受影响。
要完成这项工作，您需要将信号附件 + 插槽移出组合框对象。以下为两部分的替换—
class ConcreteStrengthComboBox(QtWidgets.QComboBox):
def __init__(self, parent = None):
super(ConcreteStrengthComboBox, self).__init__(parent)
self.addItems(["C12/15","C16/20","C20/25","C25/30","C30/37","C35/45","C40/50","C45/55",
"C50/60","C55/67","C60/75","C70/85","C80/95","C90/105"])
self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))
self.compressive_strength = ["12","16","20","25","30","35","40","45","50","55",
"60","70","80","90"]
class ConcreteStrengthInFo(QtWidgets.QWidget):
def __init__(self, parent=None):
super(ConcreteStrengthInFo, self).__init__(parent)
hbox = QtWidgets.QHBoxLayout()
concrete_strength = QtWidgets.QLabel("Concrete strength: ")
hbox.addWidget(concrete_strength)
self.concreteproperty = ConcreteProperty()
self.concretestrengthbox = ConcreteStrengthComboBox()
hbox.addWidget(self.concretestrengthbox)
self.concretestrengthbox.activated.connect(self.setdatastrength)
self.vlay = QtWidgets.QVBoxLayout()
self.vlay.addLayout(hbox)
self.vlay.addLayout(self.concreteproperty.concretestrength_lay)
@QtCore.pyqtSlot(int)
def setdatastrength(self, index):
it = self.concretestrengthbox.compressive_strength[index]
print(it)
self.concreteproperty.display_condata(it)
这在本地对我有用。
我有一个 Qgroupbox，其中包含带有 Qlabel 的 Qcombobox，我想 select 来自 Qcombobox 的值并将该值显示为 Qlabel。我有完整的代码，即使我在函数之前和之后打印值，每件事都可以正常工作，只显示 setText 不会将文本设置为 Qlabel 并更新它。
当前屏幕
我想要的
我已经更正了信号代码，当 Qgroupbox 中的 Qcombobox 出现或值将被更改时，self.activation.connect(......) 将发出索引的 int。为了确保可以工作，我在 def setdatastrength(self, index) 中打印 it-value，请参见下图确实有效，然后将参数传递给函数 self.concreteproperty.display_condata(it) 将被调用并在 self.concreteproperty.display_condata(it) 中打印值 def display_condata(self, value) 确保值传递，如下图所示，它确实有效。这行代码self.con_strength_value.setText(fmt.format(L_Display))
不会为 Qlabel 赋值。
脚本
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class secondtabmaterial(QtWidgets.QWidget):
def __init__(self, parent=None):
super(secondtabmaterial, self).__init__(parent)
self.concretewidgetinfo = ConcreteStrengthInFo()
Concrete_Group = QtWidgets.QGroupBox(self)
Concrete_Group.setTitle("&Concrete")
Concrete_Group.setLayout(self.concretewidgetinfo.grid)
class ConcreteStrengthComboBox(QtWidgets.QComboBox):
def __init__(self, parent = None):
super(ConcreteStrengthComboBox, self).__init__(parent)
self.addItems(["C12/15","C16/20","C20/25","C25/30","C30/37","C35/45"
,"C40/50","C45/55","C50/60","C55/67","C60/75","C70/85",
"C80/95","C90/105"])
self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))
self.compressive_strength = ["12","16","20","25","30","35","40",
"45","50","55","60","70","80","90"]
class ConcreteProperty(QtWidgets.QWidget):
def __init__(self, parent=None):
super(ConcreteProperty, self).__init__(parent)
self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))
concretestrength_lay = QtWidgets.QHBoxLayout(self)
fctd = "\nfcd\n\nfctd\n\nEc"
con_strength = QtWidgets.QLabel(fctd)
self.con_strength_value = QtWidgets.QLabel(" ")
concretestrength_lay.addWidget(con_strength)
concretestrength_lay.addWidget(self.con_strength_value, alignment=QtCore.Qt.AlignRight)
self.setLayout(concretestrength_lay)
@QtCore.pyqtSlot(int)
def display_condata(self, value):
try:
L_Display = str(value)
print("-------- After ------")
print(L_Display, type(L_Display))
fmt = "{}mm"
self.con_strength_value.setText(fmt.format(L_Display))
except ValueError:
print("Error")
class ConcreteStrengthInFo(QtWidgets.QWidget):
def __init__(self, parent=None):
super(ConcreteStrengthInFo, self).__init__(parent)
self.concreteproperty = ConcreteProperty()
self.concretestrengthbox = ConcreteStrengthComboBox()
self.concretestrengthbox.activated.connect(self.setdatastrength)
hbox = QtWidgets.QHBoxLayout()
concrete_strength = QtWidgets.QLabel("Concrete strength: ")
hbox.addWidget(concrete_strength)
hbox.addWidget(self.concretestrengthbox)
self.grid = QtWidgets.QGridLayout()
self.grid.addLayout(hbox, 0, 0)
self.grid.addWidget(self.concreteproperty, 1, 0)
@QtCore.pyqtSlot(int)
def setdatastrength(self, index):
it = self.concretestrengthbox.compressive_strength[index]
self.concreteproperty.display_condata(it)
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
w = secondtabmaterial()
w.show()
sys.exit(app.exec_())
以上代码已更正并最终确定。现在它可以正常工作了。
我认为问题在于您的接收槽与任何可用的 .activated 信号都不匹配。
self.activated.connect(self.setdatastrength)
@QtCore.pyqtSlot()
def setdatastrength(self):
index = self.currentIndex()
it = self.compressive_strength[index]
print(it)
self.concreteproperty.display_condata(it)
QComboBox.activated 信号发出索引的 int 或所选值的 str。 See documentation.
您已将其附加到 setdatastrength，它接受不接受任何参数（除了来自对象的 self）——这意味着它与任何可用的签名都不匹配信号，不会被调用。如果您更新定义以添加索引值，并接受单个 int 它应该可以工作。
self.activated.connect(self.setdatastrength)
@QtCore.pyqtSlot(int) # add the target type for this slot.
def setdatastrength(self, index):
it = self.compressive_strength[index]
print(it)
self.concreteproperty.display_condata(it)
更新后 — 以上问题现在看起来已修复，尽管您不需要 setdatastrength 中的额外 index = self.currentIndex() 它没有任何危害。
查看您的代码，我认为标签 正在更新。问题实际上是您根本看不到标签。查看 ConcreteProperty
class ConcreteProperty(QtWidgets.QWidget):
def __init__(self, parent=None):
super(ConcreteProperty, self).__init__(parent)
self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))
self.concretestrength_lay = QtWidgets.QHBoxLayout()
fctd = "\nfcd\n\nfctd\n\nEc"
con_strength = QtWidgets.QLabel(fctd)
self.con_strength_value = QtWidgets.QLabel(" ")
self.concretestrength_lay.addWidget(con_strength)
self.concretestrength_lay.addWidget(self.con_strength_value, alignment=QtCore.Qt.AlignLeft)
更改未出现的原因是您创建了 两个 ConcreteProperty 个对象，一个在 ConcreteStrengthInfo 中，一个在 ConcreteStrengthComboBox 中。组合框的更新会触发附加到组合框的 ConcreteProperty 的更新，而不是另一个（它们是单独的对象）。可见 ConcreteProperty 不受影响。
要完成这项工作，您需要将信号附件 + 插槽移出组合框对象。以下为两部分的替换—
class ConcreteStrengthComboBox(QtWidgets.QComboBox):
def __init__(self, parent = None):
super(ConcreteStrengthComboBox, self).__init__(parent)
self.addItems(["C12/15","C16/20","C20/25","C25/30","C30/37","C35/45","C40/50","C45/55",
"C50/60","C55/67","C60/75","C70/85","C80/95","C90/105"])
self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))
self.compressive_strength = ["12","16","20","25","30","35","40","45","50","55",
"60","70","80","90"]
class ConcreteStrengthInFo(QtWidgets.QWidget):
def __init__(self, parent=None):
super(ConcreteStrengthInFo, self).__init__(parent)
hbox = QtWidgets.QHBoxLayout()
concrete_strength = QtWidgets.QLabel("Concrete strength: ")
hbox.addWidget(concrete_strength)
self.concreteproperty = ConcreteProperty()
self.concretestrengthbox = ConcreteStrengthComboBox()
hbox.addWidget(self.concretestrengthbox)
self.concretestrengthbox.activated.connect(self.setdatastrength)
self.vlay = QtWidgets.QVBoxLayout()
self.vlay.addLayout(hbox)
self.vlay.addLayout(self.concreteproperty.concretestrength_lay)
@QtCore.pyqtSlot(int)
def setdatastrength(self, index):
it = self.concretestrengthbox.compressive_strength[index]
print(it)
self.concreteproperty.display_condata(it)
这在本地对我有用。