Mar-28-2019, 03:27 PM
Maybe there are still many mistakes in the code or in your PyQt5 Installation?
here'e a simple PyQt5 example, does this work for you?
here'e a simple PyQt5 example, does this work for you?
#!/usr/bin/python3
# -*- coding: utf-8 -*-
#############################################################################
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 <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):
root = QFileInfo(__file__).absolutePath()
self.newAct = QAction(QIcon.fromTheme('gtk-new'), "&New", self,
shortcut=QKeySequence.New, statusTip="Create a new file",
triggered=self.newFile)
self.openAct = QAction(QIcon.fromTheme('gtk-open'), "&Open...",
self, shortcut=QKeySequence.Open,
statusTip="Open an existing file", triggered=self.open)
self.saveAct = QAction(QIcon.fromTheme('gtk-save'), "&Save", self,
shortcut=QKeySequence.Save,
statusTip="Save the document to disk", triggered=self.save)
self.saveAsAct = QAction(QIcon.fromTheme('gtk-save-as'),"Save &As...", self,
shortcut=QKeySequence.SaveAs,
statusTip="Save the document under a new name",
triggered=self.saveAs)
self.exitAct = QAction(QIcon.fromTheme('application-exit'),"E&xit", self, shortcut="Ctrl+Q",
statusTip="Exit the application", triggered=self.close)
self.cutAct = QAction(QIcon.fromTheme('edit-cut'), "Cu&t", self,
shortcut=QKeySequence.Cut,
statusTip="Cut the current selection's contents to the clipboard",
triggered=self.textEdit.cut)
self.copyAct = QAction(QIcon.fromTheme('edit-copy'), "&Copy", self,
shortcut=QKeySequence.Copy,
statusTip="Copy the current selection's contents to the clipboard",
triggered=self.textEdit.copy)
self.pasteAct = QAction(QIcon.fromTheme('edit-paste'), "&Paste",
self, shortcut=QKeySequence.Paste,
statusTip="Paste the clipboard's contents into the current selection",
triggered=self.textEdit.paste)
self.aboutAct = QAction(QIcon.fromTheme('help-info'),"&About", self,
statusTip="Show the application's About box",
triggered=self.about)
self.aboutQtAct = QAction(QIcon.fromTheme('help-about'),"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_())
