'''
pyqt5 简单浏览器 by 郑瑞国
'''
import sys
from PyQt5.QtWidgets import QApplication,QMainWindow,QToolBar,QAction,QLineEdit,QTabWidget
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import QUrl,QSize
from PyQt5.QtWebEngineWidgets import QWebEngineView
 
class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.initUI()

    def initUI(self):
        self.setWindowTitle('My Browser')
        self.setWindowIcon(QIcon('icons/penguin.png'))
        self.resize(900,600)
        self.showMaximized()
        
        # 添加标签栏
        #self.tabs = QTabWidget()
        #self.add_new_tab(QUrl('http://www.baidu.com'), 'Homepage')
        #self.setCentralWidget(self.tabs)
        
        self.browser = WebEngineView()
        self.browser.load(QUrl("https://www.bing.com"))
        self.setCentralWidget(self.browser)

        # 添加导航栏
        navigation_bar = QToolBar('Navigation')
        navigation_bar.setIconSize(QSize(16, 16))
        self.addToolBar(navigation_bar)

        # 添加前进、后退、停止加载和刷新的按钮
        back_button = QAction(QIcon('icons/back.png'), 'Back', self)
        next_button = QAction(QIcon('icons/next.png'), 'Forward', self)
        stop_button = QAction(QIcon('icons/cross.png'), 'stop', self)
        reload_button = QAction(QIcon('icons/renew.png'), 'reload', self)

        back_button.triggered.connect(self.browser.back)
        next_button.triggered.connect(self.browser.forward)
        stop_button.triggered.connect(self.browser.stop)
        reload_button.triggered.connect(self.browser.reload)

        # 将按钮添加到导航栏上
        navigation_bar.addAction(back_button)
        navigation_bar.addAction(next_button)
        navigation_bar.addAction(stop_button)
        navigation_bar.addAction(reload_button)

        #添加URL地址栏
        self.urlbar = QLineEdit()
        # 让地址栏能响应回车按键信号
        self.urlbar.returnPressed.connect(self.navigate_to_url)

        navigation_bar.addSeparator()
        navigation_bar.addWidget(self.urlbar)

        #让浏览器相应url地址的变化
        self.browser.urlChanged.connect(self.renew_urlbar)

    def navigate_to_url(self):
        q = QUrl(self.urlbar.text())
        if q.scheme() == '':
            q.setScheme('http')
        self.browser.setUrl(q)

    def renew_urlbar(self, q):
        # 将当前网页的链接更新到地址栏
        self.urlbar.setText(q.toString())
        self.urlbar.setCursorPosition(0)

    def add_new_tab(self, qurl, label):
        # 为标签创建新网页
        browser = QWebEngineView()
        browser.setUrl(qurl)
        self.tabs.addTab(browser, label)
        browser.urlChanged.connect(lambda qurl, browser=browser: self.renew_urlbar(qurl, browser))
 
class WebEngineView(QWebEngineView):
    windowList = []
    def createWindow(self, QWebEnginePage_WebWindowType):
        new_webview =  WebEngineView()
        new_window = MainWindow()
        new_window.setCentralWidget(new_webview)
        self.windowList.append(new_window)
        return new_webview
 
if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

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