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#!/usr/bin/env python

#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2016 The Qt Company Ltd.
## Contact: http://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## 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 The Qt Company Ltd 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
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################

"""PySide2 port of the widgets/draganddrop/draggabletext example from Qt v5.x, originating from PyQt"""

from PySide2.QtCore import (QFile, QFileInfo, QPoint, QSettings, QSignalMapper,
        QSize, QTextStream, Qt)
from PySide2.QtGui import QIcon, QKeySequence
from PySide2.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.fromTheme("document-new", QIcon(':/images/new.png')), "&New", self,
                shortcut=QKeySequence.New, statusTip="Create a new file",
                triggered=self.newFile)

        self.openAct = QAction(QIcon.fromTheme("document-open", QIcon(':/images/open.png')), "&Open...", self,
                shortcut=QKeySequence.Open, statusTip="Open an existing file",
                triggered=self.open)

        self.saveAct = QAction(QIcon.fromTheme("document-save", 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.fromTheme("edit-cut", 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.fromTheme("edit-copy", 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.fromTheme("edit-paste", 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_())