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#!/usr/bin/env python
import sys
from PyQt4 import QtCore, QtGui
import application_rc
class MainWindow(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.curFile = QtCore.QString()
self.textEdit = QtGui.QTextEdit()
self.setCentralWidget(self.textEdit)
self.createActions()
self.createMenus()
self.createToolBars()
self.createStatusBar()
self.readSettings()
self.connect(self.textEdit.document(), QtCore.SIGNAL("contentsChanged()"),
self.documentWasModified)
self.setCurrentFile(QtCore.QString())
def closeEvent(self, event):
if self.maybeSave():
self.writeSettings()
event.accept()
else:
event.ignore()
def newFile(self):
if self.maybeSave():
self.textEdit.clear()
self.setCurrentFile(QtCore.QString())
def open(self):
if self.maybeSave():
fileName = QtGui.QFileDialog.getOpenFileName(self)
if not fileName.isEmpty():
self.loadFile(fileName)
def save(self):
if self.curFile.isEmpty():
return self.saveAs()
else:
return self.saveFile(self.curFile)
def saveAs(self):
fileName = QtGui.QFileDialog.getSaveFileName(self)
if fileName.isEmpty():
return False
return self.saveFile(fileName)
def about(self):
QtGui.QMessageBox.about(self, self.tr("About Application"),
self.tr("The <b>Application</b> example demonstrates how to "
"write modern GUI applications using Qt, with a menu bar, "
"toolbars, and a status bar."))
def documentWasModified(self):
self.setWindowModified(self.textEdit.document().isModified())
def createActions(self):
self.newAct = QtGui.QAction(QtGui.QIcon(":/images/new.png"), self.tr("&New"), self)
self.newAct.setShortcut(self.tr("Ctrl+N"))
self.newAct.setStatusTip(self.tr("Create a new file"))
self.connect(self.newAct, QtCore.SIGNAL("triggered()"), self.newFile)
self.openAct = QtGui.QAction(QtGui.QIcon(":/images/open.png"), self.tr("&Open..."), self)
self.openAct.setShortcut(self.tr("Ctrl+O"))
self.openAct.setStatusTip(self.tr("Open an existing file"))
self.connect(self.openAct, QtCore.SIGNAL("triggered()"), self.open)
self.saveAct = QtGui.QAction(QtGui.QIcon(":/images/save.png"), self.tr("&Save"), self)
self.saveAct.setShortcut(self.tr("Ctrl+S"))
self.saveAct.setStatusTip(self.tr("Save the document to disk"))
self.connect(self.saveAct, QtCore.SIGNAL("triggered()"), self.save)
self.saveAsAct = QtGui.QAction(self.tr("Save &As..."), self)
self.saveAsAct.setStatusTip(self.tr("Save the document under a new name"))
self.connect(self.saveAsAct, QtCore.SIGNAL("triggered()"), self.saveAs)
self.exitAct = QtGui.QAction(self.tr("E&xit"), self)
self.exitAct.setShortcut(self.tr("Ctrl+Q"))
self.exitAct.setStatusTip(self.tr("Exit the application"))
self.connect(self.exitAct, QtCore.SIGNAL("triggered()"), self, QtCore.SLOT("close()"))
self.cutAct = QtGui.QAction(QtGui.QIcon(":/images/cut.png"), self.tr("Cu&t"), self)
self.cutAct.setShortcut(self.tr("Ctrl+X"))
self.cutAct.setStatusTip(self.tr("Cut the current selection's contents to the "
"clipboard"))
self.connect(self.cutAct, QtCore.SIGNAL("triggered()"), self.textEdit, QtCore.SLOT("cut()"))
self.copyAct = QtGui.QAction(QtGui.QIcon(":/images/copy.png"), self.tr("&Copy"), self)
self.copyAct.setShortcut(self.tr("Ctrl+C"))
self.copyAct.setStatusTip(self.tr("Copy the current selection's contents to the "
"clipboard"))
self.connect(self.copyAct, QtCore.SIGNAL("triggered()"), self.textEdit, QtCore.SLOT("copy()"))
self.pasteAct = QtGui.QAction(QtGui.QIcon(":/images/paste.png"), self.tr("&Paste"), self)
self.pasteAct.setShortcut(self.tr("Ctrl+V"))
self.pasteAct.setStatusTip(self.tr("Paste the clipboard's contents into the current "
"selection"))
self.connect(self.pasteAct, QtCore.SIGNAL("triggered()"), self.textEdit, QtCore.SLOT("paste()"))
self.aboutAct = QtGui.QAction(self.tr("&About"), self)
self.aboutAct.setStatusTip(self.tr("Show the application's About box"))
self.connect(self.aboutAct, QtCore.SIGNAL("triggered()"), self.about)
self.aboutQtAct = QtGui.QAction(self.tr("About &Qt"), self)
self.aboutQtAct.setStatusTip(self.tr("Show the Qt library's About box"))
self.connect(self.aboutQtAct, QtCore.SIGNAL("triggered()"), QtGui.qApp, QtCore.SLOT("aboutQt()"))
self.cutAct.setEnabled(False)
self.copyAct.setEnabled(False)
self.connect(self.textEdit, QtCore.SIGNAL("copyAvailable(bool)"),
self.cutAct, QtCore.SLOT("setEnabled(bool)"))
self.connect(self.textEdit, QtCore.SIGNAL("copyAvailable(bool)"),
self.copyAct, QtCore.SLOT("setEnabled(bool)"))
def createMenus(self):
self.fileMenu = self.menuBar().addMenu(self.tr("&File"))
self.fileMenu.addAction(self.newAct)
self.fileMenu.addAction(self.openAct)
self.fileMenu.addAction(self.saveAct)
self.fileMenu.addAction(self.saveAsAct)
self.fileMenu.addSeparator();
self.fileMenu.addAction(self.exitAct)
self.editMenu = self.menuBar().addMenu(self.tr("&Edit"))
self.editMenu.addAction(self.cutAct)
self.editMenu.addAction(self.copyAct)
self.editMenu.addAction(self.pasteAct)
self.menuBar().addSeparator()
self.helpMenu = self.menuBar().addMenu(self.tr("&Help"))
self.helpMenu.addAction(self.aboutAct)
self.helpMenu.addAction(self.aboutQtAct)
def createToolBars(self):
self.fileToolBar = self.addToolBar(self.tr("File"))
self.fileToolBar.addAction(self.newAct)
self.fileToolBar.addAction(self.openAct)
self.fileToolBar.addAction(self.saveAct)
self.editToolBar = self.addToolBar(self.tr("Edit"))
self.editToolBar.addAction(self.cutAct)
self.editToolBar.addAction(self.copyAct)
self.editToolBar.addAction(self.pasteAct)
def createStatusBar(self):
self.statusBar().showMessage(self.tr("Ready"))
def readSettings(self):
settings = QtCore.QSettings("Trolltech", "Application Example")
pos = settings.value("pos", QtCore.QVariant(QtCore.QPoint(200, 200))).toPoint()
size = settings.value("size", QtCore.QVariant(QtCore.QSize(400, 400))).toSize()
self.resize(size)
self.move(pos)
def writeSettings(self):
settings = QtCore.QSettings("Trolltech", "Application Example")
settings.setValue("pos", QtCore.QVariant(self.pos()))
settings.setValue("size", QtCore.QVariant(self.size()))
def maybeSave(self):
if self.textEdit.document().isModified():
ret = QtGui.QMessageBox.warning(self, self.tr("Application"),
self.tr("The document has been modified.\n"
"Do you want to save your changes?"),
QtGui.QMessageBox.Yes | QtGui.QMessageBox.Default,
QtGui.QMessageBox.No,
QtGui.QMessageBox.Cancel | QtGui.QMessageBox.Escape)
if ret == QtGui.QMessageBox.Yes:
return self.save()
elif ret == QtGui.QMessageBox.Cancel:
return False
return True
def loadFile(self, fileName):
file = QtCore.QFile(fileName)
if not file.open(QtCore.QFile.ReadOnly | QtCore.QFile.Text):
QtGui.QMessageBox.warning(self, self.tr("Application"),
self.tr("Cannot read file %1:\n%2.").arg(fileName).arg(file.errorString()))
return
inf = QtCore.QTextStream(file)
QtGui.QApplication.setOverrideCursor(QtCore.Qt.WaitCursor)
self.textEdit.setPlainText(inf.readAll())
QtGui.QApplication.restoreOverrideCursor()
self.setCurrentFile(fileName)
self.statusBar().showMessage(self.tr("File loaded"), 2000)
def saveFile(self, fileName):
file = QtCore.QFile(fileName)
if not file.open(QtCore.QFile.WriteOnly | QtCore.QFile.Text):
QtGui.QMessageBox.warning(self, self.tr("Application"),
self.tr("Cannot write file %1:\n%2.").arg(fileName).arg(file.errorString()))
return False
outf = QtCore.QTextStream(file)
QtGui.QApplication.setOverrideCursor(QtCore.Qt.WaitCursor)
outf << self.textEdit.toPlainText()
QtGui.QApplication.restoreOverrideCursor()
self.setCurrentFile(fileName);
self.statusBar().showMessage(self.tr("File saved"), 2000)
return True
def setCurrentFile(self, fileName):
self.curFile = fileName
self.textEdit.document().setModified(False)
self.setWindowModified(False)
if self.curFile.isEmpty():
shownName = "untitled.txt"
else:
shownName = self.strippedName(self.curFile)
self.setWindowTitle(self.tr("%1[*] - %2").arg(shownName).arg(self.tr("Application")))
def strippedName(self, fullFileName):
return QtCore.QFileInfo(fullFileName).fileName()
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
mainWin = MainWindow()
mainWin.show()
sys.exit(app.exec_())
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