条形码扫描仪选项卡切换到下一行编辑

Question

我使用USB条形码扫描仪设置Qt lineEdit字段的文本以扫描生产订单号，我的问题是扫描后窗口关闭，而不是切换到下一行Edit_2以扫描项目号。如何设置lineEdit以将crusor移到下一个lineEdit_2并为下一次扫描做好准备。

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName("Dialog")
Dialog.resize(400, 300)
self.buttonBox = QtWidgets.QDialogButtonBox(Dialog)
self.buttonBox.setGeometry(QtCore.QRect(290, 20, 81, 241))
self.buttonBox.setOrientation(QtCore.Qt.Vertical)
self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel|QtWidgets.QDialogButtonBox.Ok)
self.buttonBox.setObjectName("buttonBox")
self.lineEdit = QtWidgets.QLineEdit(Dialog)
self.lineEdit.setGeometry(QtCore.QRect(50, 50, 113, 22))
self.lineEdit.setObjectName("lineEdit")
self.lineEdit_2 = QtWidgets.QLineEdit(Dialog)
self.lineEdit_2.setGeometry(QtCore.QRect(50, 120, 113, 22))
self.lineEdit_2.setObjectName("lineEdit_2")
self.lineEdit_3 = QtWidgets.QLineEdit(Dialog)
self.lineEdit_3.setGeometry(QtCore.QRect(50, 200, 113, 22))
self.lineEdit_3.setObjectName("lineEdit_3")
self.retranslateUi(Dialog)
self.buttonBox.accepted.connect(Dialog.accept)
self.buttonBox.rejected.connect(Dialog.reject)
QtCore.QMetaObject.connectSlotsByName(Dialog)
def retranslateUi(self, Dialog):
_translate = QtCore.QCoreApplication.translate
Dialog.setWindowTitle(_translate("Dialog", "Dialog"))

if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
Dialog = QtWidgets.QDialog()
ui = Ui_Dialog()
ui.setupUi(Dialog)
Dialog.show()
sys.exit(app.exec_())

Answer 1

默认情况下，当点击回车键并且QDialog有焦点时，QPushButton的按钮会被按下，点击会发出被拒绝或接受的信号，从而关闭窗口，这由默认和autoDefault属性处理，所以第一件事是覆盖该行为。

另一方面，按回车键不会移动到另一个QLineEdit，在这种情况下，您必须听该键并使用focusNextPrevidChild来移动焦点。

最后，QtDesigner生成的代码不应该被修改，所以我将假设您显示的代码在gui.py文件中，并且我将在main.py中实现逻辑：

import sys
from PyQt5 import QtCore, QtWidgets
from gui import Ui_Dialog

class Dialog(QtWidgets.QDialog, Ui_Dialog):
def __init__(self, parent=None):
super().__init__(parent)
self.setupUi(self)
self.show()
for btn in self.buttonBox.buttons():
btn.setDefault(False)
btn.setAutoDefault(False)
btn.setFocusPolicy(QtCore.Qt.NoFocus)
def keyPressEvent(self, event):
if event.key() in (QtCore.Qt.Key_Enter, QtCore.Qt.Key_Return):
self.focusNextPrevChild(True)
super().keyPressEvent(event)

if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
w = Dialog()
w.show()
sys.exit(app.exec_())