如何在 PyQt 中的每个选项卡中分离显示和变量?

Question

我正在制作漫画查看器，但我有一个问题。

所以我制作了一个程序，每次我们单击"文件"然后单击"测试"时都会打开一个新选项卡。 当我们按下选项卡上的左右按钮时，self.i的值(打印在控制台中(上下波动。

但是，问题是无论我们按下左右按钮的选项卡如何，self.i的值都会更改，并且我想显示的标签if self.i == 1仅显示在最后一个打开的选项卡上。

我需要的是让创建的每个选项卡都有自己的self.i，并且标签根据自己的self.i值显示在任何选项卡上。我不知道该怎么做。

这是单击"测试"时打开新选项卡的部分：

def Open(self):
self.tab = QWidget()
self.tab.layout = QGridLayout()
self.nextpagebutton = QPushButton(">", self)
self.nextpagebutton.setFixedSize(50, 780)
self.tab.layout.addWidget(self.nextpagebutton, 0, 2)
self.nextpagebutton.clicked.connect(self.readnext)
self.prevpagebutton = QPushButton("<", self)
self.prevpagebutton.setFixedSize(50, 780)
self.tab.layout.addWidget(self.prevpagebutton, 0, 0)
self.prevpagebutton.clicked.connect(self.readprev)
self.n = int(self.n)+1
self.tabs.addTab(self.tab, "Tab "+str(self.n))
self.tab.setLayout(self.tab.layout)

以下是当 self.i 等于 1 时显示标签的部分：

def readnext(self):
self.i+=1
if self.i == 1:
self.label = QLabel("testtext")
self.tab.layout.addWidget(self.label, 0, 1)
print(self.i)
def readprev(self):
self.i-=1
if self.i == 1:
self.label = QLabel("testtext")
self.tab.layout.addWidget(self.label, 0, 1)
print(self.i)

这是我的完整程序，您可以尝试一下，它有效：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel, QGridLayout, QWidget, QPushButton, QAction, QStatusBar, QToolBar, QTabWidget
from PyQt5.QtCore import QCoreApplication

class FenetrePrincipale(QMainWindow):
def __init__(self):
super().__init__()
self.setWindowTitle("Liseuse de Bandes Dessinées")
self.left = 10
self.top = 10
self.width = 900
self.height = 850
self.i = 0
self.setGeometry(self.left, self.top, self.width, self.height)
self.toolbar = QToolBar("Toolbar")
self.layout = QGridLayout()
self.setCentralWidget(QWidget(self))
self.centralWidget().setLayout(self.layout)
self.move(200, 0)
self.addToolBar(self.toolbar)
self.table_widget = MyTableWidget(self)
self.open = QAction("test", self)
self.open.triggered.connect(self.table_widget.Open)
self.setStatusBar(QStatusBar())
self.menuFichier = self.menuBar().addMenu("&File")
self.menuFichier.addAction(self.open)
self.widget=QWidget()
self.widget.setLayout(self.layout)
self.setCentralWidget(self.widget)
self.setCentralWidget(self.table_widget)
self.show()
class MyTableWidget(QWidget):
def __init__(self, parent=None):
super(QWidget, self).__init__(parent)
self.layout = QGridLayout()
self.i = 0
self.n = 0
# Initialize tab screen
self.tabs = QTabWidget()
self.tabs.setDocumentMode(True)
self.tabs.setMovable(True)
# Add tabs to widget
self.layout.addWidget(self.tabs)
self.setLayout(self.layout)

def Open(self):
self.tab = QWidget()
self.tab.layout = QGridLayout()
self.nextpagebutton = QPushButton(">", self)
self.nextpagebutton.setFixedSize(50, 780)
self.tab.layout.addWidget(self.nextpagebutton, 0, 2)
self.nextpagebutton.clicked.connect(self.readnext)
self.prevpagebutton = QPushButton("<", self)
self.prevpagebutton.setFixedSize(50, 780)
self.tab.layout.addWidget(self.prevpagebutton, 0, 0)
self.prevpagebutton.clicked.connect(self.readprev)
self.n = int(self.n)+1
self.tabs.addTab(self.tab, "Tab "+str(self.n))
self.tab.setLayout(self.tab.layout)
def readnext(self):
self.i+=1
if self.i == 1:
self.label = QLabel("testtext")
self.tab.layout.addWidget(self.label, 0, 1)
print(self.i)
def readprev(self):
self.i-=1
if self.i == 1:
self.label = QLabel("testtext")
self.tab.layout.addWidget(self.label, 0, 1)
print(self.i)

app = QCoreApplication.instance()
if app is None:
app = QApplication(sys.argv)
window = FenetrePrincipale()
window.show()
app.exec_()

Answer 1

这是答案！

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel, QGridLayout, QWidget, QPushButton, QAction, QStatusBar, QToolBar, QTabWidget
from PyQt5.QtCore import QCoreApplication

class FenetrePrincipale(QMainWindow):
def __init__(self):
super().__init__()
self.setWindowTitle("Liseuse de Bandes Dessinées")
self.left = 10
self.top = 10
self.width = 900
self.height = 850
self.i = 0
self.setGeometry(self.left, self.top, self.width, self.height)
self.toolbar = QToolBar("Toolbar")
self.layout = QGridLayout()
self.setCentralWidget(QWidget(self))
self.centralWidget().setLayout(self.layout)
self.move(200, 0)
self.addToolBar(self.toolbar)
self.table_widget = MyTableWidget(self)
self.open = QAction("test", self)
self.open.triggered.connect(self.table_widget.Open)
self.setStatusBar(QStatusBar())
self.menuFichier = self.menuBar().addMenu("&File")
self.menuFichier.addAction(self.open)
self.widget = QWidget()
self.widget.setLayout(self.layout)
self.setCentralWidget(self.widget)
self.setCentralWidget(self.table_widget)
self.show()

class MyTableWidget(QWidget):
def __init__(self, parent=None):
super(QWidget, self).__init__(parent)
self.layout = QGridLayout()
self.i = {}  # your self.i is now a dict
self.n = 0
self.index = {}
self.tab = {}
# Initialize tab screen
self.tabs = QTabWidget()
self.tabs.setDocumentMode(True)
self.tabs.setMovable(True)
# Add tabs to widget
self.layout.addWidget(self.tabs)
self.setLayout(self.layout)
def Open(self):
n = str(self.n)
self.i[n] = 0  # assign new key as you make a tab
self.tab[n] = QWidget()  # differentiate the tabs so we can call it back later when adding label
self.tab[n].objectName()
self.tab[n].layout = QGridLayout()
self.nextpagebutton = QPushButton(">", self)
self.nextpagebutton.setObjectName('>{}'.format(self.n))  # Give a unique name
self.nextpagebutton.setFixedSize(50, 780)
self.tab[n].layout.addWidget(self.nextpagebutton, 0, 2)
self.nextpagebutton.clicked.connect(self.readnext)
self.prevpagebutton = QPushButton("<", self)
self.prevpagebutton.setObjectName('<{}'.format(self.n))  # Give a unique name
self.prevpagebutton.setFixedSize(50, 780)
self.tab[n].layout.addWidget(self.prevpagebutton, 0, 0)
self.prevpagebutton.clicked.connect(self.readprev)
self.index[n] = self.tabs.addTab(self.tab[n], "Tab " + str(self.n))
self.tab[n].setLayout(self.tab[n].layout)
self.n = int(self.n) + 1
print(self.i)
def readnext(self):
name = str(self.sender().objectName())  # get the button's name
identifier = name[-1]
self.i[identifier] += 1
if self.i[identifier] == 1:
self.label = QLabel("testtext")
self.tab[identifier].layout.addWidget(self.label, 0, 1)
print(self.i)
def readprev(self):
name = str(self.sender().objectName())  # get the button's name
identifier = name[-1]
self.i[identifier] -= 1
if self.i[identifier] == 1:
self.label = QLabel("testtext")
self.tab[identifier].layout.addWidget(self.label, 0, 1)
print(self.i)

app = QCoreApplication.instance()
if app is None:
app = QApplication(sys.argv)
window = FenetrePrincipale()
window.show()
app.exec_()