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A small Qt application that handles coding / decoding text in a Caesar cypher
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| #!/usr/bin/env python3 | |
| # Qt GUI application for encoding text in a Caesar cypher | |
| # Form implementation generated from reading ui file 'cypherbox.ui' | |
| # | |
| # Created: Sun Aug 9 13:02:22 2015 | |
| # by: PyQt5 UI code generator 5.2.1 | |
| from PyQt5 import QtCore, QtGui, QtWidgets | |
| import sys | |
| # Changed inheritance of class Ui_MainWindow | |
| # from object to QtWidgets.QtWidget | |
| class Ui_MainWindow(QtWidgets.QWidget): | |
| # Setup constructor function | |
| def __init__(self): | |
| QtWidgets.QWidget.__init__(self) | |
| self.setupUi(self) | |
| # Automatically generated UI code | |
| def setupUi(self, MainWindow): | |
| MainWindow.setObjectName("MainWindow") | |
| MainWindow.setEnabled(True) | |
| MainWindow.resize(560, 400) | |
| sizePolicy = QtWidgets.QSizePolicy( | |
| QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed) | |
| sizePolicy.setHorizontalStretch(0) | |
| sizePolicy.setVerticalStretch(0) | |
| sizePolicy.setHeightForWidth(MainWindow.sizePolicy().hasHeightForWidth( | |
| )) | |
| MainWindow.setSizePolicy(sizePolicy) | |
| MainWindow.setMinimumSize(QtCore.QSize(560, 380)) | |
| MainWindow.setMaximumSize(QtCore.QSize(560, 380)) | |
| self.centralwidget = QtWidgets.QWidget(MainWindow) | |
| self.centralwidget.setObjectName("centralwidget") | |
| self.input_box = QtWidgets.QPlainTextEdit(self.centralwidget) | |
| self.input_box.setGeometry(QtCore.QRect(10, 10, 361, 171)) | |
| sizePolicy = QtWidgets.QSizePolicy( | |
| QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed) | |
| sizePolicy.setHorizontalStretch(0) | |
| sizePolicy.setVerticalStretch(0) | |
| sizePolicy.setHeightForWidth( | |
| self.input_box.sizePolicy().hasHeightForWidth()) | |
| self.input_box.setSizePolicy(sizePolicy) | |
| self.input_box.setMinimumSize(QtCore.QSize(0, 6)) | |
| self.input_box.setFrameShadow(QtWidgets.QFrame.Sunken) | |
| self.input_box.setLineWidth(1) | |
| self.input_box.setHorizontalScrollBarPolicy( | |
| QtCore.Qt.ScrollBarAlwaysOff) | |
| self.input_box.setObjectName("input_box") | |
| self.mode_lbl = QtWidgets.QLabel(self.centralwidget) | |
| self.mode_lbl.setGeometry(QtCore.QRect(410, 70, 51, 17)) | |
| self.mode_lbl.setObjectName("mode_lbl") | |
| self.translate_button = QtWidgets.QPushButton(self.centralwidget) | |
| self.translate_button.setGeometry(QtCore.QRect(410, 320, 111, 31)) | |
| self.translate_button.setObjectName("translate_button") | |
| self.rbtn_decode = QtWidgets.QRadioButton(self.centralwidget) | |
| self.rbtn_decode.setGeometry(QtCore.QRect(460, 90, 81, 22)) | |
| self.rbtn_decode.setObjectName("rbtn_decode") | |
| self.rbtn_encode = QtWidgets.QRadioButton(self.centralwidget) | |
| self.rbtn_encode.setGeometry(QtCore.QRect(460, 70, 71, 22)) | |
| self.rbtn_encode.setObjectName("rbtn_encode") | |
| self.rbtn_encode.setChecked(True) | |
| self.key_lbl = QtWidgets.QLabel(self.centralwidget) | |
| self.key_lbl.setGeometry(QtCore.QRect(380, 30, 90, 17)) | |
| self.key_lbl.setObjectName("key_lbl") | |
| self.key_box = QtWidgets.QLineEdit(self.centralwidget) | |
| self.key_box.setGeometry(QtCore.QRect(460, 30, 81, 21)) | |
| sizePolicy = QtWidgets.QSizePolicy( | |
| QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed) | |
| sizePolicy.setHorizontalStretch(0) | |
| sizePolicy.setVerticalStretch(0) | |
| sizePolicy.setHeightForWidth( | |
| self.key_box.sizePolicy().hasHeightForWidth()) | |
| self.key_box.setSizePolicy(sizePolicy) | |
| self.key_box.setObjectName("key_box") | |
| self.clear_button = QtWidgets.QPushButton(self.centralwidget) | |
| self.clear_button.setGeometry(QtCore.QRect(410, 280, 111, 31)) | |
| self.clear_button.setObjectName("clear_button") | |
| self.output_box = QtWidgets.QPlainTextEdit(self.centralwidget) | |
| self.output_box.setEnabled(False) | |
| self.output_box.setGeometry(QtCore.QRect(10, 190, 361, 171)) | |
| sizePolicy = QtWidgets.QSizePolicy( | |
| QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed) | |
| sizePolicy.setHorizontalStretch(0) | |
| sizePolicy.setVerticalStretch(0) | |
| sizePolicy.setHeightForWidth( | |
| self.output_box.sizePolicy().hasHeightForWidth()) | |
| self.output_box.setSizePolicy(sizePolicy) | |
| self.output_box.setFrameShadow(QtWidgets.QFrame.Sunken) | |
| self.output_box.setLineWidth(1) | |
| self.output_box.setAutoFillBackground(True) | |
| self.output_box.setHorizontalScrollBarPolicy( | |
| QtCore.Qt.ScrollBarAlwaysOff) | |
| self.output_box.setTextInteractionFlags( | |
| QtCore.Qt.TextSelectableByKeyboard | QtCore.Qt. | |
| TextSelectableByMouse) | |
| self.output_box.setBackgroundVisible(False) | |
| self.output_box.setObjectName("output_box") | |
| self.open_button = QtWidgets.QPushButton(self.centralwidget) | |
| self.open_button.setGeometry(QtCore.QRect(410, 140, 111, 31)) | |
| self.open_button.setObjectName("open_button") | |
| self.save_button = QtWidgets.QPushButton(self.centralwidget) | |
| self.save_button.setGeometry(QtCore.QRect(410, 180, 111, 31)) | |
| self.save_button.setObjectName("save_button") | |
| self.save_button.setEnabled(False) | |
| self.switch_button = QtWidgets.QPushButton(self.centralwidget) | |
| self.switch_button.setGeometry(QtCore.QRect(410, 240, 111, 31)) | |
| self.switch_button.setObjectName("switch_button") | |
| self.switch_button.setEnabled(False) | |
| self.actionExport = QtWidgets.QAction(MainWindow) | |
| self.actionExport.setObjectName("actionExport") | |
| self.actionImport = QtWidgets.QAction(MainWindow) | |
| self.actionImport.setObjectName("actionImport") | |
| self.actionAbout = QtWidgets.QAction(MainWindow) | |
| self.actionAbout.setObjectName("actionAbout") | |
| self.actionClose = QtWidgets.QAction(MainWindow) | |
| self.actionClose.setObjectName("actionClose") | |
| self.retranslateUi(MainWindow) | |
| QtCore.QMetaObject.connectSlotsByName(MainWindow) | |
| def retranslateUi(self, MainWindow): | |
| _translate = QtCore.QCoreApplication.translate | |
| MainWindow.setWindowTitle(_translate("MainWindow", "CypherBox")) | |
| self.input_box.setToolTip(_translate( | |
| "MainWindow", "Enter your message here.")) | |
| self.mode_lbl.setText(_translate("MainWindow", "Mode:")) | |
| self.translate_button.setText(_translate("MainWindow", "Translate!")) | |
| self.rbtn_decode.setText(_translate("MainWindow", "Decode")) | |
| self.rbtn_encode.setText(_translate("MainWindow", "Encode")) | |
| self.key_lbl.setText(_translate("MainWindow", "Secret Key:")) | |
| self.key_box.setToolTip(_translate( | |
| "MainWindow", "Enter an integer number.")) | |
| self.clear_button.setText(_translate("MainWindow", "Clear")) | |
| self.actionImport.setText(_translate("MainWindow", "Import text..")) | |
| self.actionAbout.setText(_translate("MainWindow", "About CypherBox")) | |
| self.actionClose.setText(_translate("MainWindow", "Close")) | |
| self.open_button.setText(_translate("MainWindow", "Import...")) | |
| self.open_button.setToolTip(_translate( | |
| "MainWindow", "Import a text file.")) | |
| self.save_button.setText(_translate("MainWindow", "Export...")) | |
| self.save_button.setToolTip(_translate( | |
| "MainWindow", "Save output to file.")) | |
| self.switch_button.setText(_translate("MainWindow", "Switch")) | |
| self.switch_button.setToolTip(_translate( | |
| "MainWindow", "Switch output to input.")) | |
| # Event handler for clicking the clear button | |
| self.clear_button.clicked.connect(self.clear_text) | |
| # Event handler for clicking the translate button | |
| self.translate_button.clicked.connect(self.translate_text) | |
| # Event handler for clicking the open button | |
| self.open_button.clicked.connect(self.open_file) | |
| # Event handler for clicking the save button | |
| self.save_button.clicked.connect(self.save_file) | |
| # Event handler for clicking the switch button | |
| self.switch_button.clicked.connect(self.switch) | |
| def clear_text(self): | |
| # Clear the input and output text boxes, | |
| # and disable the output text box | |
| self.input_box.clear() | |
| self.output_box.clear() | |
| self.output_box.setEnabled(False) | |
| self.save_button.setEnabled(False) | |
| self.switch_button.setEnabled(False) | |
| def open_file(self): | |
| # A function for opening a text file | |
| # and parsing its contents to the input box | |
| _translate = QtCore.QCoreApplication.translate | |
| fileDialog = QtWidgets.QFileDialog() | |
| fileDialog.exec_() | |
| self.input_box.clear() | |
| for file in fileDialog.selectedFiles(): | |
| f = open(file, 'r') | |
| for line in f: | |
| self.input_box.appendPlainText(_translate( | |
| "MainWindow", line.rstrip())) | |
| f.close() | |
| def save_file(self): | |
| # A function for saving the contents pf the output box as a text file | |
| saveDialog = QtWidgets.QFileDialog # Save file dialog. | |
| # Get the first item of the generated tuple, and write text to file | |
| file = saveDialog.getSaveFileName().__getitem__(0) | |
| f = open(file, 'w') | |
| for line in self.output_box.toPlainText(): | |
| f.write(line) | |
| f.close() | |
| def switch(self): | |
| # Copy the text in the output box to the input box | |
| # and clear the output box | |
| _translate = QtCore.QCoreApplication.translate | |
| self.input_box.setPlainText(_translate( | |
| "MainWindow", self.output_box.toPlainText())) | |
| self.output_box.clear() | |
| self.output_box.setEnabled(False) | |
| self.save_button.setEnabled(False) | |
| self.switch_button.setEnabled(False) | |
| def translate_text(self): | |
| _translate = QtCore.QCoreApplication.translate | |
| # Obtain text entered into input text box | |
| message = self.input_box.toPlainText().upper().strip() | |
| try: | |
| # Obtain text entered in key box, and make sure that it's numeric | |
| key = int(self.key_box.displayText()) % 26 | |
| except: | |
| # Alert the user if the key box is empty or not numeric | |
| msgBox = QtWidgets.QMessageBox() | |
| msgBox.setWindowTitle("Error") | |
| msgBox.setText("Please enter an integer to use as key.") | |
| msgBox.addButton(QtWidgets.QMessageBox.Ok) | |
| msgBox.exec_() | |
| else: | |
| # Generate an encoding alphabet based on the key | |
| letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
| shifted_letters = letters[key:] + letters[:key] | |
| if self.rbtn_encode.isChecked() == True: | |
| # Encode radio buttin is checked: encode message | |
| output_message = (message.translate(message.maketrans( | |
| letters, shifted_letters))) | |
| else: | |
| # Decode radio button is checked: decode message | |
| output_message = (message.translate(message.maketrans( | |
| shifted_letters, letters))) | |
| # Print result to output box | |
| self.output_box.setEnabled(True) | |
| self.output_box.setPlainText(_translate( | |
| "MainWindow", output_message)) | |
| # Enable the switch and export buttons | |
| self.switch_button.setEnabled(True) | |
| self.save_button.setEnabled(True) | |
| # The following is generic code used when running the Qt application | |
| if __name__ == "__main__": | |
| app = QtWidgets.QApplication(sys.argv) # Changed from QtGui.QApplication() | |
| ex = Ui_MainWindow() | |
| ex.show() # Show the form | |
| sys.exit(app.exec_()) # Execute the main function until the app is closed |
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