#!/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:
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## modification, are permitted provided that the following conditions are
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##   * 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.
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## $QT_END_LICENSE$
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#############################################################################
 
 
from PyQt5.QtCore import (QFile, QFileInfo, QPoint, QSettings, QSignalMapper,
        QSize, QTextStream, Qt)
from PyQt5.QtGui import QIcon, QKeySequence
from PyQt5.QtWidgets import (QAction, QApplication, QFileDialog, QMainWindow,
        QMdiArea, QMessageBox, QTextEdit, QWidget)
 
import mdi_rc
 
 
class MdiChild(QTextEdit):
    sequenceNumber = 1
 
    def __init__(self):
        super(MdiChild, self).__init__()
 
        self.setAttribute(Qt.WA_DeleteOnClose)
        self.isUntitled = True
 
    def newFile(self):
        self.isUntitled = True
        self.curFile = "document%d.txt" % MdiChild.sequenceNumber
        MdiChild.sequenceNumber += 1
        self.setWindowTitle(self.curFile + '[*]')
 
        self.document().contentsChanged.connect(self.documentWasModified)
 
    def loadFile(self, fileName):
        file = QFile(fileName)
        if not file.open(QFile.ReadOnly | QFile.Text):
            QMessageBox.warning(self, "MDI",
                    "Cannot read file %s:\n%s." % (fileName, file.errorString()))
            return False
 
        instr = QTextStream(file)
        QApplication.setOverrideCursor(Qt.WaitCursor)
        self.setPlainText(instr.readAll())
        QApplication.restoreOverrideCursor()
 
        self.setCurrentFile(fileName)
 
        self.document().contentsChanged.connect(self.documentWasModified)
 
        return True
 
    def save(self):
        if self.isUntitled:
            return self.saveAs()
        else:
            return self.saveFile(self.curFile)
 
    def saveAs(self):
        fileName, _ = QFileDialog.getSaveFileName(self, "Save As", self.curFile)
        if not fileName:
            return False
 
        return self.saveFile(fileName)
 
    def saveFile(self, fileName):
        file = QFile(fileName)
 
        if not file.open(QFile.WriteOnly | QFile.Text):
            QMessageBox.warning(self, "MDI",
                    "Cannot write file %s:\n%s." % (fileName, file.errorString()))
            return False
 
        outstr = QTextStream(file)
        QApplication.setOverrideCursor(Qt.WaitCursor)
        outstr << self.toPlainText()
        QApplication.restoreOverrideCursor()
 
        self.setCurrentFile(fileName)
        return True
 
    def userFriendlyCurrentFile(self):
        return self.strippedName(self.curFile)
 
    def currentFile(self):
        return self.curFile
 
    def closeEvent(self, event):
        if self.maybeSave():
            event.accept()
        else:
            event.ignore()
 
    def documentWasModified(self):
        self.setWindowModified(self.document().isModified())
 
    def maybeSave(self):
        if self.document().isModified():
            ret = QMessageBox.warning(self, "MDI",
                    "'%s' has been modified.\nDo you want to save your "
                    "changes?" % self.userFriendlyCurrentFile(),
                    QMessageBox.Save | QMessageBox.Discard | QMessageBox.Cancel)
 
            if ret == QMessageBox.Save:
                return self.save()
 
            if ret == QMessageBox.Cancel:
                return False
 
        return True
 
    def setCurrentFile(self, fileName):
        self.curFile = QFileInfo(fileName).canonicalFilePath()
        self.isUntitled = False
        self.document().setModified(False)
        self.setWindowModified(False)
        self.setWindowTitle(self.userFriendlyCurrentFile() + "[*]")
 
    def strippedName(self, fullFileName):
        return QFileInfo(fullFileName).fileName()
 
 
class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
 
        self.mdiArea = QMdiArea()
        self.mdiArea.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
        self.mdiArea.setVerticalScrollBarPolicy(Qt.ScrollBarAsNeeded)
        self.setCentralWidget(self.mdiArea)
 
        self.mdiArea.subWindowActivated.connect(self.updateMenus)
        self.windowMapper = QSignalMapper(self)
        self.windowMapper.mapped[QWidget].connect(self.setActiveSubWindow)
 
        self.createActions()
        self.createMenus()
        self.createToolBars()
        self.createStatusBar()
        self.updateMenus()
 
        self.readSettings()
 
        self.setWindowTitle("MDI")
 
    def closeEvent(self, event):
        self.mdiArea.closeAllSubWindows()
        if self.mdiArea.currentSubWindow():
            event.ignore()
        else:
            self.writeSettings()
            event.accept()
 
    def newFile(self):
        child = self.createMdiChild()
        child.newFile()
        child.show()
 
    def open(self):
        fileName, _ = QFileDialog.getOpenFileName(self)
        if fileName:
            existing = self.findMdiChild(fileName)
            if existing:
                self.mdiArea.setActiveSubWindow(existing)
                return
 
            child = self.createMdiChild()
            if child.loadFile(fileName):
                self.statusBar().showMessage("File loaded", 2000)
                child.show()
            else:
                child.close()
 
    def save(self):
        if self.activeMdiChild() and self.activeMdiChild().save():
            self.statusBar().showMessage("File saved", 2000)
 
    def saveAs(self):
        if self.activeMdiChild() and self.activeMdiChild().saveAs():
            self.statusBar().showMessage("File saved", 2000)
 
    def cut(self):
        if self.activeMdiChild():
            self.activeMdiChild().cut()
 
    def copy(self):
        if self.activeMdiChild():
            self.activeMdiChild().copy()
 
    def paste(self):
        if self.activeMdiChild():
            self.activeMdiChild().paste()
 
    def about(self):
        QMessageBox.about(self, "About MDI",
                "The <b>MDI</b> example demonstrates how to write multiple "
                "document interface applications using Qt.")
 
    def updateMenus(self):
        hasMdiChild = (self.activeMdiChild() is not None)
        self.saveAct.setEnabled(hasMdiChild)
        self.saveAsAct.setEnabled(hasMdiChild)
        self.pasteAct.setEnabled(hasMdiChild)
        self.closeAct.setEnabled(hasMdiChild)
        self.closeAllAct.setEnabled(hasMdiChild)
        self.tileAct.setEnabled(hasMdiChild)
        self.cascadeAct.setEnabled(hasMdiChild)
        self.nextAct.setEnabled(hasMdiChild)
        self.previousAct.setEnabled(hasMdiChild)
        self.separatorAct.setVisible(hasMdiChild)
 
        hasSelection = (self.activeMdiChild() is not None and
                        self.activeMdiChild().textCursor().hasSelection())
        self.cutAct.setEnabled(hasSelection)
        self.copyAct.setEnabled(hasSelection)
 
    def updateWindowMenu(self):
        self.windowMenu.clear()
        self.windowMenu.addAction(self.closeAct)
        self.windowMenu.addAction(self.closeAllAct)
        self.windowMenu.addSeparator()
        self.windowMenu.addAction(self.tileAct)
        self.windowMenu.addAction(self.cascadeAct)
        self.windowMenu.addSeparator()
        self.windowMenu.addAction(self.nextAct)
        self.windowMenu.addAction(self.previousAct)
        self.windowMenu.addAction(self.separatorAct)
 
        windows = self.mdiArea.subWindowList()
        self.separatorAct.setVisible(len(windows) != 0)
 
        for i, window in enumerate(windows):
            child = window.widget()
 
            text = "%d %s" % (i + 1, child.userFriendlyCurrentFile())
            if i < 9:
                text = '&' + text
 
            action = self.windowMenu.addAction(text)
            action.setCheckable(True)
            action.setChecked(child is self.activeMdiChild())
            action.triggered.connect(self.windowMapper.map)
            self.windowMapper.setMapping(action, window)
 
    def createMdiChild(self):
        child = MdiChild()
        self.mdiArea.addSubWindow(child)
 
        child.copyAvailable.connect(self.cutAct.setEnabled)
        child.copyAvailable.connect(self.copyAct.setEnabled)
 
        return child
 
    def createActions(self):
        self.newAct = QAction(QIcon(':/images/new.png'), "&New", self,
                shortcut=QKeySequence.New, statusTip="Create a new file",
                triggered=self.newFile)
 
        self.openAct = QAction(QIcon(':/images/open.png'), "&Open...", self,
                shortcut=QKeySequence.Open, statusTip="Open an existing file",
                triggered=self.open)
 
        self.saveAct = QAction(QIcon(':/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=QKeySequence.Quit,
                statusTip="Exit the application",
                triggered=QApplication.instance().closeAllWindows)
 
        self.cutAct = QAction(QIcon(':/images/cut.png'), "Cu&t", self,
                shortcut=QKeySequence.Cut,
                statusTip="Cut the current selection's contents to the clipboard",
                triggered=self.cut)
 
        self.copyAct = QAction(QIcon(':/images/copy.png'), "&Copy", self,
                shortcut=QKeySequence.Copy,
                statusTip="Copy the current selection's contents to the clipboard",
                triggered=self.copy)
 
        self.pasteAct = QAction(QIcon(':/images/paste.png'), "&Paste", self,
                shortcut=QKeySequence.Paste,
                statusTip="Paste the clipboard's contents into the current selection",
                triggered=self.paste)
 
        self.closeAct = QAction("Cl&ose", self,
                statusTip="Close the active window",
                triggered=self.mdiArea.closeActiveSubWindow)
 
        self.closeAllAct = QAction("Close &All", self,
                statusTip="Close all the windows",
                triggered=self.mdiArea.closeAllSubWindows)
 
        self.tileAct = QAction("&Tile", self, statusTip="Tile the windows",
                triggered=self.mdiArea.tileSubWindows)
 
        self.cascadeAct = QAction("&Cascade", self,
                statusTip="Cascade the windows",
                triggered=self.mdiArea.cascadeSubWindows)
 
        self.nextAct = QAction("Ne&xt", self, shortcut=QKeySequence.NextChild,
                statusTip="Move the focus to the next window",
                triggered=self.mdiArea.activateNextSubWindow)
 
        self.previousAct = QAction("Pre&vious", self,
                shortcut=QKeySequence.PreviousChild,
                statusTip="Move the focus to the previous window",
                triggered=self.mdiArea.activatePreviousSubWindow)
 
        self.separatorAct = QAction(self)
        self.separatorAct.setSeparator(True)
 
        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)
 
    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()
        action = self.fileMenu.addAction("Switch layout direction")
        action.triggered.connect(self.switchLayoutDirection)
        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.windowMenu = self.menuBar().addMenu("&Window")
        self.updateWindowMenu()
        self.windowMenu.aboutToShow.connect(self.updateWindowMenu)
 
        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', 'MDI Example')
        pos = settings.value('pos', QPoint(200, 200))
        size = settings.value('size', QSize(400, 400))
        self.move(pos)
        self.resize(size)
 
    def writeSettings(self):
        settings = QSettings('Trolltech', 'MDI Example')
        settings.setValue('pos', self.pos())
        settings.setValue('size', self.size())
 
    def activeMdiChild(self):
        activeSubWindow = self.mdiArea.activeSubWindow()
        if activeSubWindow:
            return activeSubWindow.widget()
        return None
 
    def findMdiChild(self, fileName):
        canonicalFilePath = QFileInfo(fileName).canonicalFilePath()
 
        for window in self.mdiArea.subWindowList():
            if window.widget().currentFile() == canonicalFilePath:
                return window
        return None
 
    def switchLayoutDirection(self):
        if self.layoutDirection() == Qt.LeftToRight:
            QApplication.setLayoutDirection(Qt.RightToLeft)
        else:
            QApplication.setLayoutDirection(Qt.LeftToRight)
 
    def setActiveSubWindow(self, window):
        if window:
            self.mdiArea.setActiveSubWindow(window)
 
 
if __name__ == '__main__':
 
    import sys
 
    app = QApplication(sys.argv)
    mainWin = MainWindow()
    mainWin.show()
    sys.exit(app.exec_())