Comment what these code does class MainWindow(QMainWindow): def navigate_home(self): self.browser.setUrl(QUrl('code.org')) def navigate_to_url(self): url = self.url_bar.text() self.browser.setUrl(QUrl(url)) def update_url(self, q): self.url_bar.setText(q.toString()) def init(self): super(MainWindow, self).init() self.browser = QWebEngineView() self.browser.setUrl(QUrl('http://code.org')) self.setCentralWidget(self.browser) self.showMaximized() navbar = QToolBar() self.addToolBar(navbar) back_btn = QAction('Back', self) back_btn.triggered.connect(self.browser.back) navbar.addAction(back_btn) forward_btn = QAction('Forward', self) forward_btn.triggered.connect(self.browser.forward) navbar.addAction(forward_btn) reload_btn = QAction('Reload', self) reload_btn.triggered.connect(self.browser.reload) navbar.addAction(reload_btn) home_btn = QAction('home', self) home_btn.triggered.connect(self.navigate_home) navbar.addAction(home_btn) self.url_bar = QLineEdit() self.url_bar.returnPressed.connect(self.navigate_to_url) navbar.addWidget(self.url_bar) self.browser.urlChanged.connect(self.update_url) app = QApplication(sys.argv) QApplication.setApplicationName('My cool browser') window = MainWindow() app.exec_()

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Comment what these code does

class MainWindow(QMainWindow):
def navigate_home(self):
self.browser.setUrl(QUrl('code.org'))

def navigate_to_url(self):
url = self.url_bar.text()
self.browser.setUrl(QUrl(url))

def update_url(self, q):
self.url_bar.setText(q.toString())

def __init__(self):
super(MainWindow, self).__init__()
self.browser = QWebEngineView()
self.browser.setUrl(QUrl('http://code.org'))
self.setCentralWidget(self.browser)
self.showMaximized()

navbar = QToolBar()
self.addToolBar(navbar)
back_btn = QAction('Back', self)
back_btn.triggered.connect(self.browser.back)
navbar.addAction(back_btn)

forward_btn = QAction('Forward', self)
forward_btn.triggered.connect(self.browser.forward)
navbar.addAction(forward_btn)

reload_btn = QAction('Reload', self)
reload_btn.triggered.connect(self.browser.reload)
navbar.addAction(reload_btn)

home_btn = QAction('home', self)
home_btn.triggered.connect(self.navigate_home)
navbar.addAction(home_btn)

self.url_bar = QLineEdit()
self.url_bar.returnPressed.connect(self.navigate_to_url)
navbar.addWidget(self.url_bar)

self.browser.urlChanged.connect(self.update_url)

app = QApplication(sys.argv)
QApplication.setApplicationName('My cool browser')
window = MainWindow()
app.exec_()

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