Python

Question

下面的代码是WebBrowser代码。问题是当我想切换选项卡时发生在函数 'SwitchTab' 中。我已经检查过，在函数 'SwitchTab' 中，我的 'Tab_Content' 变量是空的——因为它打印了 'None'——这就是问题所在。我不明白为什么那会是空的。（我加粗了代码中代表问题的部分）提前致谢...

P.S：我正在使用 Python3.8 和 PyCharm4.5.4 以及 PyQt5

import sys
import os
import json

from PyQt5.QtWidgets import (QApplication, QWidget, QVBoxLayout,
                             QHBoxLayout, QPushButton, QLabel,
                             QLineEdit, QTabBar, QFrame, QStackedLayout, QTabWidget)

from PyQt5.QtGui import QIcon, QWindow, QImage
from PyQt5.QtCore import *
from PyQt5.QtWebEngineWidgets import *




class AddressBar(QLineEdit):
     def __init__(self):
        super().__init__()

     def mousePressEvent(self, e):
         self.selectAll()


class App(QFrame):
    def __init__(self):
        super().__init__()

        self.CreateApp()
        self.setWindowTitle("Web Browser")
        self.setBaseSize(500 , 500)

    def CreateApp(self):

        self.layout = QVBoxLayout()
        self.layout.setSpacing(0)
        self.layout.setContentsMargins(0,0,0,0)

        *#Creating Tabs*
        self.TabBar = QTabBar(movable=True, tabsClosable=True)
        self.TabBar.tabCloseRequested.connect(self.TabClose)
        **self.TabBar.tabBarClicked.connect(self.SwitchTab)**

        self.TabBar.setCurrentIndex(0)

        *#Tabs List*
        self.TabCount = 0
        self.Tabs = []

        *#Creating the AddressBar*
        self.ToolBar = QWidget()
        self.ToolBarLayout = QHBoxLayout()
        self.AddressBar = AddressBar()

        self.ToolBar.setLayout(self.ToolBarLayout)
        self.ToolBarLayout.addWidget(self.AddressBar)

        *#NewTab Button*
        self.AddTabButton = QPushButton("+")
        self.AddTabButton.clicked.connect(self.AddTab)

        self.ToolBarLayout.addWidget(self.AddTabButton)

        *#Main View*
        self.Container = QWidget()
        self.Container.layout = QStackedLayout()
        self.Container.setLayout(self.Container.layout)


        self.layout.addWidget(self.TabBar)
        self.layout.addWidget(self.ToolBar)
        self.layout.addWidget(self.Container)

        self.setLayout(self.layout)
        
        self.AddTab()
        self.show()

    def TabClose(self, i):
        self.TabBar.removeTab(i)
        print(self.TabCount)
        print(self.Tabs)

    def AddTab(self):
        i = self.TabCount

        self.Tabs.append(QWidget())
        self.Tabs[i].layout = QVBoxLayout()
        self.Tabs[i].setObjectName("Tab " + str(i))

        *#Generate WebView*
        self.Tabs[i].content = QWebEngineView()
        self.Tabs[i].content.load(QUrl.fromUserInput("http://google.com"))

        *#Add WebView to Tabs layout*
        self.Tabs[i].layout.addWidget(self.Tabs[i].content)

        *#Set top level tab [] to layout*
        self.Tabs[i].setLayout(self.Tabs[i].layout)

        *#Add tab to top level StackedWidget*
        self.Container.layout.addWidget(self.Tabs[i])
        self.Container.layout.setCurrentWidget(self.Tabs[i])

        *#Set the tab at top of screen*
        self.TabBar.addTab("New Tab - " + str(i))
        self.TabBar.setTabData(i, "tab" + str(i))
        self.TabBar.setCurrentIndex(i)
        self.TabCount += 1

    **def SwitchTab(self, i):
        Tab_Data = self.TabBar.tabData(i)
        print("tab: ", Tab_Data)
        Tab_Content = self.findChild(QWidget, Tab_Data)
        print(Tab_Content)
        self.Container.layout.setCurrentWidget(Tab_Content)**


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = App()

    sys.exit(app.exec_())

Answer 1

因为findChild method takes the objectName进去的，不是你设置的tabData。在这种情况下，解决方案很简单。只需将 objectName 和 tabData 设置为相同的参数即可。

self.TabBar.setTabData(i, "Tab " + str(i))
self.Tabs[i].setObjectName("Tab " + str(i))

Python - WebBrowser 项目中的 PyQt 问题

Issue in PyQt within Python - WebBrowser Project

python-webbrowser

pygui

pyqt5