1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
#!/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.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
## * Redistributions of source code must retain the above copyright
## 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.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
## $QT_END_LICENSE$
##
###########################################################################
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_())
|
