pyqt 记事本

记事本功能：

         QtGui.QFileDialog.getOpenFileName() 打开文件选择对话框，返回打开的文件的绝对路径

         QtGui.QFileDialog.getSaveFileName() 打开文件另存为对话框 ，返回打开的文件的绝对路径

 设置绑定快捷键 

        setShortcut('Ctrl+O')

代码如下

# -*- coding: utf-8 -*-

from PyQt4 import QtCore, QtGui

try:

    _fromUtf8 = QtCore.QString.fromUtf8

except AttributeError:

    def _fromUtf8(s):

        return s

try:

    _encoding = QtGui.QApplication.UnicodeUTF8

    def _translate(context, text, disambig):

        return QtGui.QApplication.translate(context, text, disambig, _encoding)

except AttributeError:

    def _translate(context, text, disambig):

        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(QtGui.QMainWindow):

    def setupUi(self, MainWindow):

        MainWindow.setObjectName(_fromUtf8("MainWindow"))

        MainWindow.resize(800, 600)

        self.centralwidget = QtGui.QWidget(MainWindow)

        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))

        self.gridLayout = QtGui.QGridLayout(self.centralwidget)

        self.gridLayout.setObjectName(_fromUtf8("gridLayout"))

        self.textEdit = QtGui.QTextEdit(self.centralwidget)

        self.textEdit.setObjectName(_fromUtf8("textEdit"))

        self.gridLayout.addWidget(self.textEdit, 0, 0, 1, 1)

        MainWindow.setCentralWidget(self.centralwidget)

        MainWindow.setWindowIcon(QtGui.QIcon('./gita.ico'))

        self.menubar = QtGui.QMenuBar(MainWindow)

        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))

        self.menubar.setObjectName(_fromUtf8("menubar"))

        self.menu = QtGui.QMenu(self.menubar)

        self.menu.setObjectName(_fromUtf8("menu"))

        openAction = self.menu.addAction('open')

        saveAction = self.menu.addAction('save')

        saveAsAction = self.menu.addAction('save as')

        openAction.setShortcut('Ctrl+O')

        saveAction.setShortcut('Ctrl+S')

        self.connect(openAction, QtCore.SIGNAL("triggered()"), self.openFile)

        self.connect(saveAction, QtCore.SIGNAL("triggered()"), self.saveFile)

        self.file = None

        MainWindow.setMenuBar(self.menubar)

        self.statusbar = QtGui.QStatusBar(MainWindow)

        self.statusbar.setObjectName(_fromUtf8("statusbar"))

        MainWindow.setStatusBar(self.statusbar)

        self.menubar.addAction(self.menu.menuAction())

        self.retranslateUi(MainWindow)

        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):

        MainWindow.setWindowTitle(_translate("MainWindow", "记事本", None))

        self.menu.setTitle(_translate("MainWindow", "文件", None))

    def openFile(self):

        self.file = unicode(QtGui.QFileDialog.getOpenFileName(self))

        if self.file:

            self.textEdit.setText(open(self.file).read().decode('utf-8'))

            MainWindow.setWindowTitle(_translate("MainWindow", self.file, None))

    def saveFile(self):

        plainText =  self.textEdit.toPlainText()

        if not self.file:

            self.file = unicode(QtGui.QFileDialog.getSaveFileName(self))

        MainWindow.setWindowTitle(_translate("MainWindow", self.file, None))

        with open(self.file, 'w') as f:

            f.write(plainText.toUtf8())

if __name__ == "__main__":

    import sys

    app = QtGui.QApplication(sys.argv)

    MainWindow = QtGui.QMainWindow()

    ui = Ui_MainWindow()

    ui.setupUi(MainWindow)

    MainWindow.show()

    sys.exit(app.exec_())