#!/usr/bin/env python ############################################################################# ## ## Copyright (C) 2014 Riverbank Computing Limited. ## 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, QFileInfo, QPoint, QRect, QSettings, QSize, Qt, QTextStream) from PyQt5.QtGui import QIcon, QKeySequence from PyQt5.QtWidgets import (QAction, QApplication, QFileDialog, QMainWindow, QMessageBox, QTextEdit) class MainWindow(QMainWindow): def __init__(self): super(MainWindow, self).__init__() self.curFile = '' self.textEdit = QTextEdit() self.setCentralWidget(self.textEdit) self.createActions() self.createMenus() self.createToolBars() self.createStatusBar() self.readSettings() self.textEdit.document().contentsChanged.connect(self.documentWasModified) self.setCurrentFile('') 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('') def open(self): if self.maybeSave(): fileName, _ = QFileDialog.getOpenFileName(self) if fileName: self.loadFile(fileName) def save(self): if self.curFile: return self.saveFile(self.curFile) return self.saveAs() def saveAs(self): fileName, _ = QFileDialog.getSaveFileName(self) if fileName: return self.saveFile(fileName) return False def about(self): QMessageBox.about(self, "About Application", "The Application 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): root = QFileInfo(__file__).absolutePath() self.newAct = QAction(QIcon(root + '/images/new.png'), "&New", self, shortcut=QKeySequence.New, statusTip="Create a new file", triggered=self.newFile) self.openAct = QAction(QIcon(root + '/images/open.png'), "&Open...", self, shortcut=QKeySequence.Open, statusTip="Open an existing file", triggered=self.open) self.saveAct = QAction(QIcon(root + '/images/save.png'), "&Save", self, shortcut=QKeySequence.Save, statusTip="Save the document to disk", triggered=self.save) self.saveAsAct = QAction("Save &As...", self, shortcut=QKeySequence.SaveAs, statusTip="Save the document under a new name", triggered=self.saveAs) self.exitAct = QAction("E&xit", self, shortcut="Ctrl+Q", statusTip="Exit the application", triggered=self.close) self.cutAct = QAction(QIcon(root + '/images/cut.png'), "Cu&t", self, shortcut=QKeySequence.Cut, statusTip="Cut the current selection's contents to the clipboard", triggered=self.textEdit.cut) self.copyAct = QAction(QIcon(root + '/images/copy.png'), "&Copy", self, shortcut=QKeySequence.Copy, statusTip="Copy the current selection's contents to the clipboard", triggered=self.textEdit.copy) self.pasteAct = QAction(QIcon(root + '/images/paste.png'), "&Paste", self, shortcut=QKeySequence.Paste, statusTip="Paste the clipboard's contents into the current selection", triggered=self.textEdit.paste) 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) self.cutAct.setEnabled(False) self.copyAct.setEnabled(False) self.textEdit.copyAvailable.connect(self.cutAct.setEnabled) self.textEdit.copyAvailable.connect(self.copyAct.setEnabled) def createMenus(self): self.fileMenu = self.menuBar().addMenu("&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("&Edit") self.editMenu.addAction(self.cutAct) self.editMenu.addAction(self.copyAct) self.editMenu.addAction(self.pasteAct) self.menuBar().addSeparator() self.helpMenu = self.menuBar().addMenu("&Help") self.helpMenu.addAction(self.aboutAct) self.helpMenu.addAction(self.aboutQtAct) def createToolBars(self): self.fileToolBar = self.addToolBar("File") self.fileToolBar.addAction(self.newAct) self.fileToolBar.addAction(self.openAct) self.fileToolBar.addAction(self.saveAct) self.editToolBar = self.addToolBar("Edit") self.editToolBar.addAction(self.cutAct) self.editToolBar.addAction(self.copyAct) self.editToolBar.addAction(self.pasteAct) def createStatusBar(self): self.statusBar().showMessage("Ready") def readSettings(self): settings = QSettings("Trolltech", "Application Example") pos = settings.value("pos", QPoint(200, 200)) size = settings.value("size", QSize(400, 400)) self.resize(size) self.move(pos) def writeSettings(self): settings = QSettings("Trolltech", "Application Example") settings.setValue("pos", self.pos()) settings.setValue("size", self.size()) def maybeSave(self): if self.textEdit.document().isModified(): ret = QMessageBox.warning(self, "Application", "The document has been modified.\nDo you want to save " "your changes?", QMessageBox.Save | QMessageBox.Discard | QMessageBox.Cancel) if ret == QMessageBox.Save: return self.save() if ret == QMessageBox.Cancel: return False return True def loadFile(self, fileName): file = QFile(fileName) if not file.open(QFile.ReadOnly | QFile.Text): QMessageBox.warning(self, "Application", "Cannot read file %s:\n%s." % (fileName, file.errorString())) return inf = QTextStream(file) QApplication.setOverrideCursor(Qt.WaitCursor) self.textEdit.setPlainText(inf.readAll()) QApplication.restoreOverrideCursor() self.setCurrentFile(fileName) self.statusBar().showMessage("File loaded", 2000) def saveFile(self, fileName): file = QFile(fileName) if not file.open(QFile.WriteOnly | QFile.Text): QMessageBox.warning(self, "Application", "Cannot write file %s:\n%s." % (fileName, file.errorString())) return False outf = QTextStream(file) QApplication.setOverrideCursor(Qt.WaitCursor) outf << self.textEdit.toPlainText() QApplication.restoreOverrideCursor() self.setCurrentFile(fileName); self.statusBar().showMessage("File saved", 2000) return True def setCurrentFile(self, fileName): self.curFile = fileName self.textEdit.document().setModified(False) self.setWindowModified(False) if self.curFile: shownName = self.strippedName(self.curFile) else: shownName = 'untitled.txt' self.setWindowTitle("%s[*] - Application" % shownName) def strippedName(self, fullFileName): return QFileInfo(fullFileName).fileName() if __name__ == '__main__': import sys app = QApplication(sys.argv) mainWin = MainWindow() mainWin.show() sys.exit(app.exec_())