要将焦点从第一个文本框更改为下一个文本框吗？

Question

要将焦点从第一个文本框更改为下一个文本框（将焦点更改为下一个子或上一个子）。当我按下回车键时（就像tab键一样）。附上我的密码。（第一个文件：example_main_File.py），第二个文件是（example_source_File.py）。如何解决

第一个文件-（示例\u main\u File.py）

import sys

from PyQt5.QtWidgets import *
from PyQt5.QtCore import  *
from PyQt5.QtGui import *

from example_source_file import Sourcefile

item1 = ["Python", "Python 2.7", "Python 2.9", "Python 3.5", "Python 3.7", "National", "Zebra",
        "Apple", "X Ray", "Boat", "Tiger", "Item001", "Item002", "Item003", "Item004", "Item005",
        "001Item", "002Item", "003Item", "004Item", "005Item", "Ball", "Cat", "Dog", "Fish",
        "Gold Fish", "Star Fish", "2821", "2822", "2823", "2811", "2812", "2813"]

item2 = ["India","America","Russia","China","England","Iran","Iraq","Ice Land"]

item3 = ["FootBall","Volly Ball","Basket Ball","Ball","Hand Ball", "Rugby","Cricket","Long 
        Jump","High Jump"]

class Check(QWidget):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("Check Window")
        self.textbox1 = QLineEdit(self)
        self.textbox1.setGeometry(100, 100, 300, 30)
        self.textbox2 = QLineEdit(self)
        self.textbox2.setGeometry(100, 150, 300, 30)
        self.textbox3 = QLineEdit(self)
        self.textbox3.setGeometry(100, 200, 300, 30)

        self.lbox1 = QListWidget()
        self.lbox2 = QListWidget(self)
        self.lbox2.setGeometry(100,250,300,500)
        self.textbox1.setObjectName("textbox1")
        self.textbox2.setObjectName("textbox2")
        self.textbox3.setObjectName("textbox3")
        self.lbox2.setObjectName("listbox2")

        self.updateallwidgets()
        QApplication.instance().focusChanged.connect(self.on_focusChanged)

    def updateallwidgets(self):
        QWidget.allwidgets = QApplication.allWidgets()
        for i in QWidget.allwidgets:
            j = i.objectName()

    def on_focusChanged(self):
        fwidget = QApplication.focusWidget()
        if fwidget is not None:

            if fwidget.objectName() == "textbox1":
                self.lbox1.clear()
                self.lbox2.clear()
                self.lbox1.addItems(item1)
                self.lbox2.addItems(item1)
                self.getdetails_1 = Sourcefile(self.textbox1,self.lbox1,self.lbox2)
                self.textbox1.textChanged.connect(self.getdetails_1.func_textbox_textchanged)
            elif fwidget.objectName() == "textbox2":
                self.lbox1.clear()
                self.lbox2.clear()
                self.lbox1.addItems(item2)
                self.lbox2.addItems(item2)
                self.getdetails_2 = Sourcefile(self.textbox2,self.lbox1,self.lbox2)
                self.textbox2.textChanged.connect(self.getdetails_2.func_textbox_textchanged)
            elif fwidget.objectName() == "textbox3":
                self.lbox1.clear()
                self.lbox2.clear()
                self.lbox1.addItems(item3)
                self.lbox2.addItems(item3)
                self.getdetails_3 = Sourcefile(self.textbox3,self.lbox1,self.lbox2)
                self.textbox3.textChanged.connect(self.getdetails_3.func_textbox_textchanged)
            return True

def main():
    myapp = QApplication(sys.argv)
    mywin = Check()
    mywin.show()
    sys.exit(myapp.exec_())

if __name__ == "__main__":
    main()

>；第二个文件（示例\u source\u File.py）

from PyQt5.QtWidgets import *
from PyQt5.QtGui import  *
from PyQt5.QtCore import *

flag = 1
search_text_length = 0
startitem_rowno = None
enditem_rowno = None
selected_item = None

class Sourcefile(QWidget):
    def __init__(self, textbox, listbox1,listbox2,parent=None):
        super().__init__(listbox2)
        global startitem_rowno,enditem_rowno

        self.setFocusPolicy(Qt.StrongFocus)
        self.tbox1 = textbox
        self.lbox1 = listbox1
        self.lbox2 = listbox2

        self.tbox1.installEventFilter(self)
        self.lbox2.installEventFilter(self)

        startitem_rowno = 0
        enditem_rowno = len(self.lbox2) - 1

    def eventFilter(self, source, event):
        global cursor_position, textbox_value,selected_item

        if event.type() == QEvent.KeyPress and source is self.tbox1:

            if event.modifiers() == Qt.AltModifier and event.key() == Qt.Key_S:
                self.func_item_startswith()
                return True

            if event.key() == Qt.Key_Down:
                self.lbox2.setFocus()
                self.lbox2.setCurrentRow(startitem_rowno)
                cursor_position = self.tbox1.cursorPosition()
                textbox_value = self.tbox1.text()
                print(cursor_position)
                print(textbox_value)

            if event.key() == Qt.Key_Up:
                self.lbox2.setFocus()
                self.lbox2.setCurrentRow(enditem_rowno)
                cursor_position = self.tbox1.cursorPosition()
                textbox_value = self.tbox1.text()

            if event.key() == Qt.Key_Return:
                print("return key pressed")
                #self.parent().focusNextChild()
                #self.focusNextPrevChild(True)
                ############# I am Struk here ##############

        if event.type() == QEvent.KeyPress and source is self.lbox2:

            if event.key() == Qt.Key_Left or event.key() == Qt.Key_Backspace:
                self.tbox1.setFocus()
                return True
            elif event.key() == Qt.Key_Return:
                self.selected_item = self.lbox2.currentItem().text()

                if self.selected_item is not None:
                    self.tbox1.setText(self.selected_item)
                    self.tbox1.setFocus()
                    return True
            elif event.key() == Qt.Key_Up or event.key() == Qt.Key_Down:
                pass
        return super(Sourcefile, self).eventFilter(source, event)

    def func_item_startswith(self):
        global flag, startitem_rowno, enditem_rowno
        flag = 1
        startitem_rowno = 0
        enditem_rowno = startitem_count - 1
        self.lbox2.clear()

        if startitem_count > 0:
            for item in item_startswith:
                self.lbox2.addItem(item.text())
        else:
            print("No Matching from start item")

    def func_item_normal(self):
        global falg,startitem_rowno,enditem_rowno
        flag = 0
        startitem_rowno = 0
        enditem_rowno = normal_count - 1

        self.lbox2.clear()

        if normal_count > 0:
            for item in item_normal:
                self.lbox2.addItem(item.text())

    def func_textbox_textchanged(self, txt):
        global search_text, search_text_length, total_listbox_item, availableitem_count,\ 
               normal_count, startitem_count,containitem_count, enditem_count, item_normal,\ 
               item_startswith, item_contains, item_endswith, flag,startitem_rowno, enditem_rowno

        search_text = self.tbox1.text()
        search_text_length = len(search_text)
        total_listbox_item = len(self.lbox2)

        item_normal = self.lbox1.findItems("*", Qt.MatchWildcard)
        item_startswith = self.lbox1.findItems(search_text, Qt.MatchStartsWith)

        normal_count = len(item_normal)
        startitem_count = len(item_startswith)

        self.func_item_normal()

        if search_text_length >= 1: pass
        else: flag = 1

        self.lbox2.clear()

        if flag == 1:
            self.func_item_startswith()
        else:
            self.func_item_normal()

    def listbox_clicked(self, item):
        self.tbox1.setText(item.text())
        self.tbox1.setFocus()

Answer 1

您可以连接QLineEdits的returnPressed信号来设置下一个小部件的焦点，例如

self.textbox1.returnPressed.connect(lambda: self.textbox2.setFocus(Qt.ShortcutFocusReason))

此外，您还可以使用关键字参数设置小部件的objectName，并保存一行代码，例如

self.textbox1 = QLineEdit(self, objectName = 'textbox1')

我只使用了您的示例_main_file.py。我认为这会给你带来你想要的行为：

import sys

from PyQt5.QtWidgets import *
from PyQt5.QtCore import  *
from PyQt5.QtGui import *

      
# ~ from example_source_file import Sourcefile

item1 = ["Python", "Python 2.7", "Python 2.9", "Python 3.5", 
         "Python 3.7", "National", "Zebra", "Apple", "X Ray", "Boat", 
         "Tiger", "Item001", "Item002", "Item003", "Item004", "Item005",
         "001Item", "002Item", "003Item", "004Item", "005Item", "Ball",
         "Cat", "Dog", "Fish", "Gold Fish", "Star Fish", "2821", "2822",
         "2823", "2811", "2812", "2813"]

item2 = ["India","America","Russia","China","England","Iran","Iraq","Ice Land"]

item3 = ["FootBall","Volly Ball","Basket Ball","Ball","Hand Ball", 
         "Rugby","Cricket", "Long Jump","High Jump"]

class Check(QWidget):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("Check Window")
        self.textbox1 = QLineEdit(self, objectName = 'textbox1')
        self.textbox1.setGeometry(100, 100, 300, 30)
        self.textbox2 = QLineEdit(self, objectName = 'textbox2')
        self.textbox2.setGeometry(100, 150, 300, 30)
        self.textbox3 = QLineEdit(self, objectName = 'textbox3')
        self.textbox3.setGeometry(100, 200, 300, 30)
        

        self.lbox1 = QListWidget()
        self.lbox2 = QListWidget(self, objectName = 'listbox2')
        self.lbox2.setGeometry(100,250,300,500)
        
        self.textbox1.returnPressed.connect(lambda: self.textbox2.setFocus(Qt.ShortcutFocusReason))
        self.textbox2.returnPressed.connect(lambda: self.textbox3.setFocus(Qt.ShortcutFocusReason))
        self.textbox3.returnPressed.connect(lambda: self.lbox2.setFocus(Qt.ShortcutFocusReason))
        

        self.updateallwidgets()
        QApplication.instance().focusChanged.connect(self.on_focusChanged)

    def updateallwidgets(self):
        QWidget.allwidgets = QApplication.allWidgets()
        for i in QWidget.allwidgets:
            j = i.objectName()

    def on_focusChanged(self):
        fwidget = QApplication.focusWidget()
        if fwidget is not None:

            if fwidget.objectName() == "textbox1":
                self.lbox1.clear()
                self.lbox2.clear()
                self.lbox1.addItems(item1)
                self.lbox2.addItems(item1)
                # ~ self.getdetails_1 = Sourcefile(self.textbox1,self.lbox1,self.lbox2)
                # ~ self.textbox1.textChanged.connect(self.getdetails_1.func_textbox_textchanged)
            elif fwidget.objectName() == "textbox2":
                self.lbox1.clear()
                self.lbox2.clear()
                self.lbox1.addItems(item2)
                self.lbox2.addItems(item2)
                # ~ self.getdetails_2 = Sourcefile(self.textbox2,self.lbox1,self.lbox2)
                # ~ self.textbox2.textChanged.connect(self.getdetails_2.func_textbox_textchanged)
            elif fwidget.objectName() == "textbox3":
                self.lbox1.clear()
                self.lbox2.clear()
                self.lbox1.addItems(item3)
                self.lbox2.addItems(item3)
                # ~ self.getdetails_3 = Sourcefile(self.textbox3,self.lbox1,self.lbox2)
                # ~ self.textbox3.textChanged.connect(self.getdetails_3.func_textbox_textchanged)
            return True

def main():
    myapp = QApplication(sys.argv)
    mywin = Check()
    mywin.show()
    sys.exit(myapp.exec_())

if __name__ == "__main__":
    main()