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#!/usr/bin/env python
"""PyQt4 port of the tools/codecs example from Qt v4.x"""
import sys
from PyQt4 import QtCore, QtGui
class MainWindow(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.textEdit = QtGui.QTextEdit()
self.textEdit.setLineWrapMode(QtGui.QTextEdit.NoWrap)
self.setCentralWidget(self.textEdit)
self.codecs = []
self.findCodecs()
self.previewForm = PreviewForm(self)
self.previewForm.setCodecList(self.codecs)
self.saveAsActs = []
self.createActions()
self.createMenus()
self.setWindowTitle(self.tr("Codecs"))
self.resize(500, 400)
def open(self):
fileName = QtGui.QFileDialog.getOpenFileName(self)
if not fileName.isEmpty():
inFile = QtCore.QFile(fileName)
if not inFile.open(QtCore.QFile.ReadOnly):
QtGui.QMessageBox.warning(self, self.tr("Codecs"),
self.tr("Cannot read file %1:\n%2")
.arg(fileName).arg(inFile.errorString()))
return
data = inFile.readAll()
self.previewForm.setEncodedData(data)
if self.previewForm.exec_():
self.textEdit.setPlainText(self.previewForm.decodedString())
def save(self):
fileName = QtGui.QFileDialog.getSaveFileName(self)
if not fileName.isEmpty():
outFile = QtCore.QFile(fileName)
if not outFile.open(QtCore.QFile.WriteOnly):
QtGui.QMessageBox.warning(self, self.tr("Codecs"),
self.tr("Cannot write file %1:\n%2")
.arg(fileName).arg(outFile.errorString()))
return
action = self.sender()
codecName = action.data().toByteArray()
out = QtCore.QTextStream(outFile)
out.setCodec(codecName.data())
out << self.textEdit.toPlainText()
def about(self):
QtGui.QMessageBox.about(self, self.tr("About Codecs"), self.tr(
"The <b>Codecs</b> example demonstrates how to "
"read and write files using various encodings."))
def aboutToShowSaveAsMenu(self):
currentText = self.textEdit.toPlainText()
for action in self.saveAsActs:
codecName = action.data().toByteArray()
codec = QtCore.QTextCodec.codecForName(codecName)
action.setVisible(codec and codec.canEncode(currentText))
def findCodecs(self):
codecMap = []
iso8859RegExp = QtCore.QRegExp("ISO[- ]8859-([0-9]+).*")
for mib in QtCore.QTextCodec.availableMibs():
codec = QtCore.QTextCodec.codecForMib(mib)
sortKey = codec.name().toUpper().data()
rank = 0
if sortKey.startswith("UTF-8"):
rank = 1
elif sortKey.startswith("UTF-16"):
rank = 2
elif iso8859RegExp.exactMatch(sortKey):
if iso8859RegExp.cap(1).size() == 1:
rank = 3
else:
rank = 4
else:
rank = 5
codecMap.append((str(rank) + sortKey, codec))
codecMap.sort()
self.codecs = [item[-1] for item in codecMap]
def createActions(self):
self.openAct = QtGui.QAction(self.tr("&Open..."), self)
self.openAct.setShortcut(self.tr("Ctrl+O"))
self.connect(self.openAct, QtCore.SIGNAL("triggered()"), self.open)
for codec in self.codecs:
text = self.tr("%1...").arg(QtCore.QString(codec.name()))
action = QtGui.QAction(text, self)
action.setData(QtCore.QVariant(codec.name()))
self.connect(action, QtCore.SIGNAL("triggered()"), self.save)
self.saveAsActs.append(action)
self.exitAct = QtGui.QAction(self.tr("E&xit"), self)
self.exitAct.setShortcut(self.tr("Ctrl+Q"))
self.connect(self.exitAct, QtCore.SIGNAL("triggered()"),
self, QtCore.SLOT("close()"))
self.aboutAct = QtGui.QAction(self.tr("&About"), self)
self.connect(self.aboutAct, QtCore.SIGNAL("triggered()"),
self.about)
self.aboutQtAct = QtGui.QAction(self.tr("About &Qt"), self)
self.connect(self.aboutQtAct, QtCore.SIGNAL("triggered()"),
QtGui.qApp, QtCore.SLOT("aboutQt()"))
def createMenus(self):
self.saveAsMenu = QtGui.QMenu(self.tr("&Save As"), self)
for action in self.saveAsActs:
self.saveAsMenu.addAction(action)
self.connect(self.saveAsMenu, QtCore.SIGNAL("aboutToShow()"),
self.aboutToShowSaveAsMenu)
self.fileMenu = QtGui.QMenu(self.tr("&File"), self)
self.fileMenu.addAction(self.openAct)
self.fileMenu.addMenu(self.saveAsMenu)
self.fileMenu.addSeparator()
self.fileMenu.addAction(self.exitAct)
self.helpMenu = QtGui.QMenu(self.tr("&Help"), self)
self.helpMenu.addAction(self.aboutAct)
self.helpMenu.addAction(self.aboutQtAct)
self.menuBar().addMenu(self.fileMenu)
self.menuBar().addSeparator()
self.menuBar().addMenu(self.helpMenu)
class PreviewForm(QtGui.QDialog):
def __init__(self, parent):
QtGui.QDialog.__init__(self, parent)
self.encodingComboBox = QtGui.QComboBox()
self.encodingLabel = QtGui.QLabel(self.tr("&Encoding:"))
self.encodingLabel.setBuddy(self.encodingComboBox)
self.textEdit = QtGui.QTextEdit()
self.textEdit.setLineWrapMode(QtGui.QTextEdit.NoWrap)
self.textEdit.setReadOnly(True)
self.okButton = QtGui.QPushButton(self.tr("OK"))
self.cancelButton = QtGui.QPushButton(self.tr("Cancel"))
self.okButton.setDefault(True)
self.connect(self.encodingComboBox, QtCore.SIGNAL("activated(int)"),
self.updateTextEdit)
self.connect(self.okButton, QtCore.SIGNAL("clicked()"),
self, QtCore.SLOT("accept()"))
self.connect(self.cancelButton, QtCore.SIGNAL("clicked()"),
self, QtCore.SLOT("reject()"))
buttonLayout = QtGui.QHBoxLayout()
buttonLayout.addStretch(1)
buttonLayout.addWidget(self.okButton)
buttonLayout.addWidget(self.cancelButton)
mainLayout = QtGui.QGridLayout()
mainLayout.addWidget(self.encodingLabel, 0, 0)
mainLayout.addWidget(self.encodingComboBox, 0, 1)
mainLayout.addWidget(self.textEdit, 1, 0, 1, 2)
mainLayout.addLayout(buttonLayout, 2, 0, 1, 2)
self.setLayout(mainLayout)
self.setWindowTitle(self.tr("Choose Encoding"))
self.resize(400, 300)
def setCodecList(self, codecs):
self.encodingComboBox.clear()
for codec in codecs:
self.encodingComboBox.addItem(QtCore.QString(codec.name()),
QtCore.QVariant(codec.mibEnum()))
def setEncodedData(self, data):
self.encodedData = data
self.updateTextEdit()
def decodedString(self):
return self.decodedStr
def updateTextEdit(self):
mib,ok = self.encodingComboBox.itemData(self.encodingComboBox.currentIndex()).toInt()
codec = QtCore.QTextCodec.codecForMib(mib)
data = QtCore.QTextStream(self.encodedData)
data.setAutoDetectUnicode(False)
data.setCodec(codec)
self.decodedStr = data.readAll()
self.textEdit.setPlainText(self.decodedStr)
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
mainWin = MainWindow()
mainWin.show()
sys.exit(app.exec_())
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