QlineEdit 和信号槽
QlineEdit and signal & slot
我用 QLineEdit 和 QLabel 创建了一个小部件，我想从 QlineEdit 获取输入并用 QLabel 显示它。我使用了 Signal 和 Slot 连接，我不知道我做错了什么，但它不能正常工作。我想从 QLineEdit 中获取这两个值，然后再显示它。
当前window
我想要什么？
代码：
import os
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class WinDialog(QtWidgets.QDialog):
currenttextedited = QtCore.pyqtSignal(int)
def __init__(self, parent=None):
super(WinDialog, self).__init__(parent)
self.setGeometry(300,300,350,300)
self.setWindowTitle("Signal & Slot")
self.propertyWidget = PropertyWidget()
section_lay = QtWidgets.QHBoxLayout()
section_label = QtWidgets.QLabel("Name: ")
section_edit = QtWidgets.QLineEdit('')
length_lay = QtWidgets.QHBoxLayout()
length_label = QtWidgets.QLabel("Input a number: L = ")
self.length_edit = QtWidgets.QLineEdit('1000')
self.length_edit.setInputMask("999999")
self.length_edit.setFocus(True)
thick_lay = QtWidgets.QHBoxLayout()
thick_label = QtWidgets.QLabel("Input a text: T = ")
thick_edit = QtWidgets.QLineEdit('')
section_lay.addWidget(section_label)
section_lay.addWidget(section_edit)
length_lay.addWidget(length_label)
length_lay.addWidget(self.length_edit)
length_lay.addStretch()
thick_lay.addWidget(thick_label)
thick_lay.addWidget(thick_edit)
thick_lay.addStretch()
VB_lay = QtWidgets.QVBoxLayout()
VB_lay.addStretch()
VB_lay.addLayout(length_lay)
VB_lay.addLayout(thick_lay)
VB_lay.addStretch()
buttonBox = QtWidgets.QDialogButtonBox()
buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel
|QtWidgets.QDialogButtonBox.Ok)
buttonBox.accepted.connect(self.accept)
buttonBox.rejected.connect(self.reject)
grid = QtWidgets.QGridLayout(self)
grid.addLayout(section_lay, 0, 0, 1, 2)
grid.addLayout(VB_lay, 1, 0)
grid.addWidget(self.propertyWidget, 2, 0)
grid.addWidget(buttonBox, 3, 0, 1, 2)
self.length_edit.textEdited.connect(self.textchanged)
def textchanged(self, text):
print(text)
self.currenttextedited.emit(text)
class PropertyWidget(QtWidgets.QWidget):
def __init__(self, parent=None):
super(PropertyWidget, self).__init__(parent)
HB_lay = QtWidgets.QHBoxLayout(self)
self.Displaylabel = QtWidgets.QLabel('')
HB_lay.addWidget(self.Displaylabel)
HB_lay.addStretch()
@QtCore.pyqtSlot(int)
def Display(self, text):
try:
L_Display = int(text)
T_Display = int(text)
fmt = "L = {}mm\nT = {}mm"
self.Displaylabel.setText(fmt.format(L_Display, T_Display))
except ValueError:
print("Error")
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
w = WinDialog()
w.show()
sys.exit(app.exec_())
根据图像中的示例，您想要显示不同的文本，但您将相同的数字转换为整数：L_Display = int(text) 和 T_Display = int(text) 那么您希望如何显示 2 个不同的文本？，显然，函数显示需要 2 个条目（self 的 2 个不同条目加上我已更改为小写，因为建议函数具有小写名称）。
现在的逻辑如下：如果 length_edit 或 thick_edit 的任何文本发生变化，那么您必须调用 display() 传递新文本。所以解决方案是使用一个插槽连接到两个 QLineEdit 的 textEdited 信号，并在其中获取文本并传递文本。
最后我看到你希望 QLineEdit 只接收数字，所以一个选择是使用 QIntValidator 这样只接受数字（另一个更好的选择是使用 QSpinBox 而不是 QLineEdit)
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class WinDialog(QtWidgets.QDialog):
def __init__(self, parent=None):
super(WinDialog, self).__init__(parent)
self.setGeometry(300,300,350,300)
self.setWindowTitle("Signal & Slot")
self.propertyWidget = PropertyWidget()
section_lay = QtWidgets.QHBoxLayout()
section_label = QtWidgets.QLabel("Name: ")
section_edit = QtWidgets.QLineEdit('')
length_lay = QtWidgets.QHBoxLayout()
length_label = QtWidgets.QLabel("Input a number: L = ")
self.length_edit = QtWidgets.QLineEdit()
self.length_edit.setFocus(True)
val_lenght = QtGui.QIntValidator(0, 100000, self.length_edit)
self.length_edit.setValidator(val_lenght)
thick_lay = QtWidgets.QHBoxLayout()
thick_label = QtWidgets.QLabel("Input a text: T = ")
self.thick_edit = QtWidgets.QLineEdit()
val_thick = QtGui.QIntValidator(0, 100000, self.thick_edit)
self.thick_edit.setValidator(val_thick)
section_lay.addWidget(section_label)
section_lay.addWidget(section_edit)
length_lay.addWidget(length_label)
length_lay.addWidget(self.length_edit)
length_lay.addStretch()
thick_lay.addWidget(thick_label)
thick_lay.addWidget(self.thick_edit)
thick_lay.addStretch()
VB_lay = QtWidgets.QVBoxLayout()
VB_lay.addStretch()
VB_lay.addLayout(length_lay)
VB_lay.addLayout(thick_lay)
VB_lay.addStretch()
buttonBox = QtWidgets.QDialogButtonBox()
buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel
| QtWidgets.QDialogButtonBox.Ok)
buttonBox.accepted.connect(self.accept)
buttonBox.rejected.connect(self.reject)
grid = QtWidgets.QGridLayout(self)
grid.addLayout(section_lay, 0, 0, 1, 2)
grid.addLayout(VB_lay, 1, 0)
grid.addWidget(self.propertyWidget, 2, 0)
grid.addWidget(buttonBox, 3, 0, 1, 2)
self.length_edit.textEdited.connect(self.onTextEdited)
self.thick_edit.textEdited.connect(self.onTextEdited)
def onTextEdited(self):
l = self.length_edit.text()
t = self.thick_edit.text()
self.propertyWidget.display(l, t)
class PropertyWidget(QtWidgets.QWidget):
def __init__(self, parent=None):
super(PropertyWidget, self).__init__(parent)
HB_lay = QtWidgets.QHBoxLayout(self)
self.Displaylabel = QtWidgets.QLabel('')
HB_lay.addWidget(self.Displaylabel)
HB_lay.addStretch()
def display(self, l, t):
try:
L_Display = int(l)
T_Display = int(t)
fmt = "L = {}mm\nT = {}mm"
self.Displaylabel.setText(fmt.format(L_Display, T_Display))
except ValueError:
self.Displaylabel.clear()
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
w = WinDialog()
w.show()
sys.exit(app.exec_())
我用 QLineEdit 和 QLabel 创建了一个小部件，我想从 QlineEdit 获取输入并用 QLabel 显示它。我使用了 Signal 和 Slot 连接，我不知道我做错了什么，但它不能正常工作。我想从 QLineEdit 中获取这两个值，然后再显示它。
当前window
我想要什么？
代码：
import os
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class WinDialog(QtWidgets.QDialog):
currenttextedited = QtCore.pyqtSignal(int)
def __init__(self, parent=None):
super(WinDialog, self).__init__(parent)
self.setGeometry(300,300,350,300)
self.setWindowTitle("Signal & Slot")
self.propertyWidget = PropertyWidget()
section_lay = QtWidgets.QHBoxLayout()
section_label = QtWidgets.QLabel("Name: ")
section_edit = QtWidgets.QLineEdit('')
length_lay = QtWidgets.QHBoxLayout()
length_label = QtWidgets.QLabel("Input a number: L = ")
self.length_edit = QtWidgets.QLineEdit('1000')
self.length_edit.setInputMask("999999")
self.length_edit.setFocus(True)
thick_lay = QtWidgets.QHBoxLayout()
thick_label = QtWidgets.QLabel("Input a text: T = ")
thick_edit = QtWidgets.QLineEdit('')
section_lay.addWidget(section_label)
section_lay.addWidget(section_edit)
length_lay.addWidget(length_label)
length_lay.addWidget(self.length_edit)
length_lay.addStretch()
thick_lay.addWidget(thick_label)
thick_lay.addWidget(thick_edit)
thick_lay.addStretch()
VB_lay = QtWidgets.QVBoxLayout()
VB_lay.addStretch()
VB_lay.addLayout(length_lay)
VB_lay.addLayout(thick_lay)
VB_lay.addStretch()
buttonBox = QtWidgets.QDialogButtonBox()
buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel
|QtWidgets.QDialogButtonBox.Ok)
buttonBox.accepted.connect(self.accept)
buttonBox.rejected.connect(self.reject)
grid = QtWidgets.QGridLayout(self)
grid.addLayout(section_lay, 0, 0, 1, 2)
grid.addLayout(VB_lay, 1, 0)
grid.addWidget(self.propertyWidget, 2, 0)
grid.addWidget(buttonBox, 3, 0, 1, 2)
self.length_edit.textEdited.connect(self.textchanged)
def textchanged(self, text):
print(text)
self.currenttextedited.emit(text)
class PropertyWidget(QtWidgets.QWidget):
def __init__(self, parent=None):
super(PropertyWidget, self).__init__(parent)
HB_lay = QtWidgets.QHBoxLayout(self)
self.Displaylabel = QtWidgets.QLabel('')
HB_lay.addWidget(self.Displaylabel)
HB_lay.addStretch()
@QtCore.pyqtSlot(int)
def Display(self, text):
try:
L_Display = int(text)
T_Display = int(text)
fmt = "L = {}mm\nT = {}mm"
self.Displaylabel.setText(fmt.format(L_Display, T_Display))
except ValueError:
print("Error")
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
w = WinDialog()
w.show()
sys.exit(app.exec_())
根据图像中的示例，您想要显示不同的文本，但您将相同的数字转换为整数：L_Display = int(text) 和 T_Display = int(text) 那么您希望如何显示 2 个不同的文本？，显然，函数显示需要 2 个条目（self 的 2 个不同条目加上我已更改为小写，因为建议函数具有小写名称）。
现在的逻辑如下：如果 length_edit 或 thick_edit 的任何文本发生变化，那么您必须调用 display() 传递新文本。所以解决方案是使用一个插槽连接到两个 QLineEdit 的 textEdited 信号，并在其中获取文本并传递文本。
最后我看到你希望 QLineEdit 只接收数字，所以一个选择是使用 QIntValidator 这样只接受数字（另一个更好的选择是使用 QSpinBox 而不是 QLineEdit)
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class WinDialog(QtWidgets.QDialog):
def __init__(self, parent=None):
super(WinDialog, self).__init__(parent)
self.setGeometry(300,300,350,300)
self.setWindowTitle("Signal & Slot")
self.propertyWidget = PropertyWidget()
section_lay = QtWidgets.QHBoxLayout()
section_label = QtWidgets.QLabel("Name: ")
section_edit = QtWidgets.QLineEdit('')
length_lay = QtWidgets.QHBoxLayout()
length_label = QtWidgets.QLabel("Input a number: L = ")
self.length_edit = QtWidgets.QLineEdit()
self.length_edit.setFocus(True)
val_lenght = QtGui.QIntValidator(0, 100000, self.length_edit)
self.length_edit.setValidator(val_lenght)
thick_lay = QtWidgets.QHBoxLayout()
thick_label = QtWidgets.QLabel("Input a text: T = ")
self.thick_edit = QtWidgets.QLineEdit()
val_thick = QtGui.QIntValidator(0, 100000, self.thick_edit)
self.thick_edit.setValidator(val_thick)
section_lay.addWidget(section_label)
section_lay.addWidget(section_edit)
length_lay.addWidget(length_label)
length_lay.addWidget(self.length_edit)
length_lay.addStretch()
thick_lay.addWidget(thick_label)
thick_lay.addWidget(self.thick_edit)
thick_lay.addStretch()
VB_lay = QtWidgets.QVBoxLayout()
VB_lay.addStretch()
VB_lay.addLayout(length_lay)
VB_lay.addLayout(thick_lay)
VB_lay.addStretch()
buttonBox = QtWidgets.QDialogButtonBox()
buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel
| QtWidgets.QDialogButtonBox.Ok)
buttonBox.accepted.connect(self.accept)
buttonBox.rejected.connect(self.reject)
grid = QtWidgets.QGridLayout(self)
grid.addLayout(section_lay, 0, 0, 1, 2)
grid.addLayout(VB_lay, 1, 0)
grid.addWidget(self.propertyWidget, 2, 0)
grid.addWidget(buttonBox, 3, 0, 1, 2)
self.length_edit.textEdited.connect(self.onTextEdited)
self.thick_edit.textEdited.connect(self.onTextEdited)
def onTextEdited(self):
l = self.length_edit.text()
t = self.thick_edit.text()
self.propertyWidget.display(l, t)
class PropertyWidget(QtWidgets.QWidget):
def __init__(self, parent=None):
super(PropertyWidget, self).__init__(parent)
HB_lay = QtWidgets.QHBoxLayout(self)
self.Displaylabel = QtWidgets.QLabel('')
HB_lay.addWidget(self.Displaylabel)
HB_lay.addStretch()
def display(self, l, t):
try:
L_Display = int(l)
T_Display = int(t)
fmt = "L = {}mm\nT = {}mm"
self.Displaylabel.setText(fmt.format(L_Display, T_Display))
except ValueError:
self.Displaylabel.clear()
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
w = WinDialog()
w.show()
sys.exit(app.exec_())