#!/usr/bin/env python
 
 
#############################################################################
##
## Copyright (C) 2013 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
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## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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## (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 Qt
from PyQt5.QtGui import QKeySequence
from PyQt5.QtWidgets import (QAction, QActionGroup, QApplication, QFrame,
        QLabel, QMainWindow, QMenu, QMessageBox, QSizePolicy, QVBoxLayout,
        QWidget)
 
 
class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
 
        widget = QWidget()
        self.setCentralWidget(widget)
 
        topFiller = QWidget()
        topFiller.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
 
        self.infoLabel = QLabel(
                "<i>Choose a menu option, or right-click to invoke a context menu</i>",
                alignment=Qt.AlignCenter)
        self.infoLabel.setFrameStyle(QFrame.StyledPanel | QFrame.Sunken)
 
        bottomFiller = QWidget()
        bottomFiller.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
 
        vbox = QVBoxLayout()
        vbox.setContentsMargins(5, 5, 5, 5)
        vbox.addWidget(topFiller)
        vbox.addWidget(self.infoLabel)
        vbox.addWidget(bottomFiller)
        widget.setLayout(vbox)
 
        self.createActions()
        self.createMenus()
 
        message = "A context menu is available by right-clicking"
        self.statusBar().showMessage(message)
 
        self.setWindowTitle("Menus")
        self.setMinimumSize(160,160)
        self.resize(480,320)
 
    def contextMenuEvent(self, event):
        menu = QMenu(self)
        menu.addAction(self.cutAct)
        menu.addAction(self.copyAct)
        menu.addAction(self.pasteAct)
        menu.exec_(event.globalPos())
 
    def newFile(self):
        self.infoLabel.setText("Invoked <b>File|New</b>")
 
    def open(self):
        self.infoLabel.setText("Invoked <b>File|Open</b>")
 
    def save(self):
        self.infoLabel.setText("Invoked <b>File|Save</b>")
 
    def print_(self):
        self.infoLabel.setText("Invoked <b>File|Print</b>")
 
    def undo(self):
        self.infoLabel.setText("Invoked <b>Edit|Undo</b>")
 
    def redo(self):
        self.infoLabel.setText("Invoked <b>Edit|Redo</b>")
 
    def cut(self):
        self.infoLabel.setText("Invoked <b>Edit|Cut</b>")
 
    def copy(self):
        self.infoLabel.setText("Invoked <b>Edit|Copy</b>")
 
    def paste(self):
        self.infoLabel.setText("Invoked <b>Edit|Paste</b>")
 
    def bold(self):
        self.infoLabel.setText("Invoked <b>Edit|Format|Bold</b>")
 
    def italic(self):
        self.infoLabel.setText("Invoked <b>Edit|Format|Italic</b>")
 
    def leftAlign(self):
        self.infoLabel.setText("Invoked <b>Edit|Format|Left Align</b>")
 
    def rightAlign(self):
        self.infoLabel.setText("Invoked <b>Edit|Format|Right Align</b>")
 
    def justify(self):
        self.infoLabel.setText("Invoked <b>Edit|Format|Justify</b>")
 
    def center(self):
        self.infoLabel.setText("Invoked <b>Edit|Format|Center</b>")
 
    def setLineSpacing(self):
        self.infoLabel.setText("Invoked <b>Edit|Format|Set Line Spacing</b>")
 
    def setParagraphSpacing(self):
        self.infoLabel.setText("Invoked <b>Edit|Format|Set Paragraph Spacing</b>")
 
    def about(self):
        self.infoLabel.setText("Invoked <b>Help|About</b>")
        QMessageBox.about(self, "About Menu",
                "The <b>Menu</b> example shows how to create menu-bar menus "
                "and context menus.")
 
    def aboutQt(self):
        self.infoLabel.setText("Invoked <b>Help|About Qt</b>")
 
    def createActions(self):
        self.newAct = QAction("&New", self, shortcut=QKeySequence.New,
                statusTip="Create a new file", triggered=self.newFile)
 
        self.openAct = QAction("&Open...", self, shortcut=QKeySequence.Open,
                statusTip="Open an existing file", triggered=self.open)
 
        self.saveAct = QAction("&Save", self, shortcut=QKeySequence.Save,
                statusTip="Save the document to disk", triggered=self.save)
 
        self.printAct = QAction("&Print...", self, shortcut=QKeySequence.Print,
                statusTip="Print the document", triggered=self.print_)
 
        self.exitAct = QAction("E&xit", self, shortcut="Ctrl+Q",
                statusTip="Exit the application", triggered=self.close)
 
        self.undoAct = QAction("&Undo", self, shortcut=QKeySequence.Undo,
                statusTip="Undo the last operation", triggered=self.undo)
 
        self.redoAct = QAction("&Redo", self, shortcut=QKeySequence.Redo,
                statusTip="Redo the last operation", triggered=self.redo)
 
        self.cutAct = QAction("Cu&t", self, shortcut=QKeySequence.Cut,
                statusTip="Cut the current selection's contents to the clipboard",
                triggered=self.cut)
 
        self.copyAct = QAction("&Copy", self, shortcut=QKeySequence.Copy,
                statusTip="Copy the current selection's contents to the clipboard",
                triggered=self.copy)
 
        self.pasteAct = QAction("&Paste", self, shortcut=QKeySequence.Paste,
                statusTip="Paste the clipboard's contents into the current selection",
                triggered=self.paste)
 
        self.boldAct = QAction("&Bold", self, checkable=True,
                shortcut="Ctrl+B", statusTip="Make the text bold",
                triggered=self.bold)
 
        boldFont = self.boldAct.font()
        boldFont.setBold(True)
        self.boldAct.setFont(boldFont)
 
        self.italicAct = QAction("&Italic", self, checkable=True,
                shortcut="Ctrl+I", statusTip="Make the text italic",
                triggered=self.italic)
 
        italicFont = self.italicAct.font()
        italicFont.setItalic(True)
        self.italicAct.setFont(italicFont)
 
        self.setLineSpacingAct = QAction("Set &Line Spacing...", self,
                statusTip="Change the gap between the lines of a paragraph",
                triggered=self.setLineSpacing)
 
        self.setParagraphSpacingAct = QAction("Set &Paragraph Spacing...",
                self, statusTip="Change the gap between paragraphs",
                triggered=self.setParagraphSpacing)
 
        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=self.aboutQt)
        self.aboutQtAct.triggered.connect(QApplication.instance().aboutQt)
 
        self.leftAlignAct = QAction("&Left Align", self, checkable=True,
                shortcut="Ctrl+L", statusTip="Left align the selected text",
                triggered=self.leftAlign)
 
        self.rightAlignAct = QAction("&Right Align", self, checkable=True,
                shortcut="Ctrl+R", statusTip="Right align the selected text",
                triggered=self.rightAlign)
 
        self.justifyAct = QAction("&Justify", self, checkable=True,
                shortcut="Ctrl+J", statusTip="Justify the selected text",
                triggered=self.justify)
 
        self.centerAct = QAction("&Center", self, checkable=True,
                shortcut="Ctrl+C", statusTip="Center the selected text",
                triggered=self.center)
 
        self.alignmentGroup = QActionGroup(self)
        self.alignmentGroup.addAction(self.leftAlignAct)
        self.alignmentGroup.addAction(self.rightAlignAct)
        self.alignmentGroup.addAction(self.justifyAct)
        self.alignmentGroup.addAction(self.centerAct)
        self.leftAlignAct.setChecked(True)
 
    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.printAct)
        self.fileMenu.addSeparator()
        self.fileMenu.addAction(self.exitAct)
 
        self.editMenu = self.menuBar().addMenu("&Edit")
        self.editMenu.addAction(self.undoAct)
        self.editMenu.addAction(self.redoAct)
        self.editMenu.addSeparator()
        self.editMenu.addAction(self.cutAct)
        self.editMenu.addAction(self.copyAct)
        self.editMenu.addAction(self.pasteAct)
        self.editMenu.addSeparator()
 
        self.helpMenu = self.menuBar().addMenu("&Help")
        self.helpMenu.addAction(self.aboutAct)
        self.helpMenu.addAction(self.aboutQtAct)
 
        self.formatMenu = self.editMenu.addMenu("&Format")
        self.formatMenu.addAction(self.boldAct)
        self.formatMenu.addAction(self.italicAct)
        self.formatMenu.addSeparator().setText("Alignment")
        self.formatMenu.addAction(self.leftAlignAct)
        self.formatMenu.addAction(self.rightAlignAct)
        self.formatMenu.addAction(self.justifyAct)
        self.formatMenu.addAction(self.centerAct)
        self.formatMenu.addSeparator()
        self.formatMenu.addAction(self.setLineSpacingAct)
        self.formatMenu.addAction(self.setParagraphSpacingAct)
 
 
if __name__ == '__main__':
 
    import sys
 
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())