Хотите изменить фокус с первого текстового поля на следующее текстовое поле?

Question

Хотите изменить фокус с первого текстового поля на следующее, (сменить фокус на следующего дочернего или предыдущего дочернего элемента). когда я нажимаю клавишу ввода / возврата (как и клавиша вкладки). Прикрепите мой код. (Первый файл: example_main_file.py), а второй - (example_source_file.py). Как решить?

Первый файл - (example_main_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()

> Второй файл (example_source_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

Вы можете подключить сигнал returnPressed ваших QLineEdits, чтобы установить фокус следующего виджета, например,

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

Кроме того, вы можете установить objectName своих виджетов с помощью аргумента ключевого слова и сохраните строку кода, например

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

Я работал только с вашим example_main_file.py. Я думаю, что это дает желаемое поведение:

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()