#!/usr/bin/env python


#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited
## Copyright (C) 2010 Hans-Peter Jansen <hpj@urpla.net>.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
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## modification, are permitted provided that the following conditions are
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##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
##     the names of its contributors may be used to endorse or promote
##     products derived from this software without specific prior written
##     permission.
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## $QT_END_LICENSE$
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###########################################################################


from PyQt5.QtCore import QFile, QIODevice, QTextStream, QUrl
from PyQt5.QtGui import QKeySequence
from PyQt5.QtWidgets import (QAction, QApplication, QFileDialog, QInputDialog,
        QLineEdit, QMainWindow, QMessageBox, QWidget)

from ui_previewer import Ui_Form


class Previewer(QWidget, Ui_Form):
    def __init__(self, parent=None):
        super(Previewer, self).__init__(parent)

        self.setupUi(self)
        self.baseUrl = QUrl()
 
    def setBaseUrl(self, url):
        self.baseUrl = url

    def on_previewButton_clicked(self):
        # Update the contents in the web viewer.
        text = self.plainTextEdit.toPlainText()
        self.webView.setHtml(text, self.baseUrl)


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()

        self.createActions()
        self.createMenus()
        self.centralWidget = Previewer(self)
        self.setCentralWidget(self.centralWidget)
        self.centralWidget.webView.loadFinished.connect(self.updateTextEdit)
        self.setStartupText()

    def createActions(self):
        self.openAct = QAction("&Open...", self, shortcut=QKeySequence.Open,
                statusTip="Open an existing HTML file", triggered=self.open)

        self.openUrlAct = QAction("&Open URL...", self, shortcut="Ctrl+U",
                statusTip="Open a URL", triggered=self.openUrl)

        self.saveAct = QAction("&Save", self, shortcut=QKeySequence.Save,
                statusTip="Save the HTML file to disk", triggered=self.save)

        self.exitAct = QAction("E&xit", self, shortcut=QKeySequence.Quit,
                statusTip="Exit the application", triggered=self.close)

        self.aboutAct = QAction("&About", self,
                statusTip="Show the application's About box",
                triggered=self.about)

        self.aboutQtAct = QAction("About &Qt", self,
                statusTip="Show the Qt library's About box",
                triggered=QApplication.instance().aboutQt)

    def createMenus(self):
        self.fileMenu = self.menuBar().addMenu("&File")
        self.fileMenu.addAction(self.openAct)
        self.fileMenu.addAction(self.openUrlAct)
        self.fileMenu.addAction(self.saveAct)
        self.fileMenu.addSeparator()
        self.fileMenu.addAction(self.exitAct)
        self.menuBar().addSeparator()
        self.helpMenu = self.menuBar().addMenu("&Help")
        self.helpMenu.addAction(self.aboutAct)
        self.helpMenu.addAction(self.aboutQtAct)

    def about(self):
        QMessageBox.about(self, "About Previewer",
                "The <b>Previewer</b> example demonstrates how to view HTML "
                "documents using a QtWebKitWidgets.QWebView.")

    def open(self):
        fileName, _ = QFileDialog.getOpenFileName(self)
        if fileName:
            fd = QFile(fileName)
            if not fd.open(QIODevice.ReadOnly):
                QMessageBox.information(self, "Unable to open file",
                        fd.errorString())
                return

            output = QTextStream(fd).readAll()

            # Display contents.
            self.centralWidget.plainTextEdit.setPlainText(output)
            self.centralWidget.setBaseUrl(QUrl.fromLocalFile(fileName))

    def openUrl(self):
        url, ok = QInputDialog.getText(self, "Enter a URL", "URL:",
                QLineEdit.Normal, "http://")

        if ok and url:
            url = QUrl(url)
            self.centralWidget.webView.setUrl(url)

    def save(self):
        content = self.centralWidget.plainTextEdit.toPlainText()
        fileName, _ = QFileDialog.getSaveFileName(self)
        if fileName:
            fd = QFile(fileName)
            if not fd.open(QIODevice.WriteOnly):
                QMessageBox.information(self, "Unable to open file",
                        fd.errorString())
                return

            QTextStream(fd) << content
 
    def updateTextEdit(self):
        mainFrame = self.centralWidget.webView.page().mainFrame()
        frameText = mainFrame.toHtml()
        self.centralWidget.plainTextEdit.setPlainText(frameText)

    def setStartupText(self):
        self.centralWidget.webView.setHtml("""
<html><body>
 <h1>HTML Previewer</h1>
  <p>This example shows you how to use QtWebKitWidgets.QWebView to
   preview HTML data written in a QtWidgets.QPlainTextEdit.
  </p>
</body></html>""")


if __name__ == '__main__':

    import sys

    app = QApplication(sys.argv)

    mainWindow = MainWindow()
    mainWindow.show()

    sys.exit(app.exec_())