#!/usr/bin/env python

import sys
from PyQt4 import QtCore, QtGui

import application_rc


class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        self.curFile = QtCore.QString()

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

        self.createActions()
        self.createMenus()
        self.createToolBars()
        self.createStatusBar()

        self.readSettings()

        self.connect(self.textEdit.document(), QtCore.SIGNAL("contentsChanged()"),
                     self.documentWasModified)

        self.setCurrentFile(QtCore.QString())

    def closeEvent(self, event):
        if self.maybeSave():
            self.writeSettings()
            event.accept()
        else:
            event.ignore()

    def newFile(self):
        if self.maybeSave():
            self.textEdit.clear()
            self.setCurrentFile(QtCore.QString())

    def open(self):
        if self.maybeSave():
            fileName = QtGui.QFileDialog.getOpenFileName(self)
            if not fileName.isEmpty():
                self.loadFile(fileName)

    def save(self):
        if self.curFile.isEmpty():
            return self.saveAs()
        else:
            return self.saveFile(self.curFile)

    def saveAs(self):
        fileName = QtGui.QFileDialog.getSaveFileName(self)
        if fileName.isEmpty():
            return False

        return self.saveFile(fileName)

    def about(self):
        QtGui.QMessageBox.about(self, self.tr("About Application"),
            self.tr("The <b>Application</b> example demonstrates how to "
                    "write modern GUI applications using Qt, with a menu bar, "
                    "toolbars, and a status bar."))

    def documentWasModified(self):
        self.setWindowModified(self.textEdit.document().isModified())

    def createActions(self):
        self.newAct = QtGui.QAction(QtGui.QIcon(":/images/new.png"), self.tr("&New"), self)
        self.newAct.setShortcut(self.tr("Ctrl+N"))
        self.newAct.setStatusTip(self.tr("Create a new file"))
        self.connect(self.newAct, QtCore.SIGNAL("triggered()"), self.newFile)

        self.openAct = QtGui.QAction(QtGui.QIcon(":/images/open.png"), self.tr("&Open..."), self)
        self.openAct.setShortcut(self.tr("Ctrl+O"))
        self.openAct.setStatusTip(self.tr("Open an existing file"))
        self.connect(self.openAct, QtCore.SIGNAL("triggered()"), self.open)

        self.saveAct = QtGui.QAction(QtGui.QIcon(":/images/save.png"), self.tr("&Save"), self)
        self.saveAct.setShortcut(self.tr("Ctrl+S"))
        self.saveAct.setStatusTip(self.tr("Save the document to disk"))
        self.connect(self.saveAct, QtCore.SIGNAL("triggered()"), self.save)

        self.saveAsAct = QtGui.QAction(self.tr("Save &As..."), self)
        self.saveAsAct.setStatusTip(self.tr("Save the document under a new name"))
        self.connect(self.saveAsAct, QtCore.SIGNAL("triggered()"), self.saveAs)

        self.exitAct = QtGui.QAction(self.tr("E&xit"), self)
        self.exitAct.setShortcut(self.tr("Ctrl+Q"))
        self.exitAct.setStatusTip(self.tr("Exit the application"))
        self.connect(self.exitAct, QtCore.SIGNAL("triggered()"), self, QtCore.SLOT("close()"))

        self.cutAct = QtGui.QAction(QtGui.QIcon(":/images/cut.png"), self.tr("Cu&t"), self)
        self.cutAct.setShortcut(self.tr("Ctrl+X"))
        self.cutAct.setStatusTip(self.tr("Cut the current selection's contents to the "
                                         "clipboard"))
        self.connect(self.cutAct, QtCore.SIGNAL("triggered()"), self.textEdit, QtCore.SLOT("cut()"))

        self.copyAct = QtGui.QAction(QtGui.QIcon(":/images/copy.png"), self.tr("&Copy"), self)
        self.copyAct.setShortcut(self.tr("Ctrl+C"))
        self.copyAct.setStatusTip(self.tr("Copy the current selection's contents to the "
                                          "clipboard"))
        self.connect(self.copyAct, QtCore.SIGNAL("triggered()"), self.textEdit, QtCore.SLOT("copy()"))

        self.pasteAct = QtGui.QAction(QtGui.QIcon(":/images/paste.png"), self.tr("&Paste"), self)
        self.pasteAct.setShortcut(self.tr("Ctrl+V"))
        self.pasteAct.setStatusTip(self.tr("Paste the clipboard's contents into the current "
                                           "selection"))
        self.connect(self.pasteAct, QtCore.SIGNAL("triggered()"), self.textEdit, QtCore.SLOT("paste()"))

        self.aboutAct = QtGui.QAction(self.tr("&About"), self)
        self.aboutAct.setStatusTip(self.tr("Show the application's About box"))
        self.connect(self.aboutAct, QtCore.SIGNAL("triggered()"), self.about)

        self.aboutQtAct = QtGui.QAction(self.tr("About &Qt"), self)
        self.aboutQtAct.setStatusTip(self.tr("Show the Qt library's About box"))
        self.connect(self.aboutQtAct, QtCore.SIGNAL("triggered()"), QtGui.qApp, QtCore.SLOT("aboutQt()"))

        self.cutAct.setEnabled(False)
        self.copyAct.setEnabled(False)
        self.connect(self.textEdit, QtCore.SIGNAL("copyAvailable(bool)"),
                     self.cutAct, QtCore.SLOT("setEnabled(bool)"))
        self.connect(self.textEdit, QtCore.SIGNAL("copyAvailable(bool)"),
                     self.copyAct, QtCore.SLOT("setEnabled(bool)"))

    def createMenus(self):
        self.fileMenu = self.menuBar().addMenu(self.tr("&File"))
        self.fileMenu.addAction(self.newAct)
        self.fileMenu.addAction(self.openAct)
        self.fileMenu.addAction(self.saveAct)
        self.fileMenu.addAction(self.saveAsAct)
        self.fileMenu.addSeparator();
        self.fileMenu.addAction(self.exitAct)

        self.editMenu = self.menuBar().addMenu(self.tr("&Edit"))
        self.editMenu.addAction(self.cutAct)
        self.editMenu.addAction(self.copyAct)
        self.editMenu.addAction(self.pasteAct)

        self.menuBar().addSeparator()

        self.helpMenu = self.menuBar().addMenu(self.tr("&Help"))
        self.helpMenu.addAction(self.aboutAct)
        self.helpMenu.addAction(self.aboutQtAct)

    def createToolBars(self):
        self.fileToolBar = self.addToolBar(self.tr("File"))
        self.fileToolBar.addAction(self.newAct)
        self.fileToolBar.addAction(self.openAct)
        self.fileToolBar.addAction(self.saveAct)

        self.editToolBar = self.addToolBar(self.tr("Edit"))
        self.editToolBar.addAction(self.cutAct)
        self.editToolBar.addAction(self.copyAct)
        self.editToolBar.addAction(self.pasteAct)

    def createStatusBar(self):
        self.statusBar().showMessage(self.tr("Ready"))

    def readSettings(self):
        settings = QtCore.QSettings("Trolltech", "Application Example")
        pos = settings.value("pos", QtCore.QVariant(QtCore.QPoint(200, 200))).toPoint()
        size = settings.value("size", QtCore.QVariant(QtCore.QSize(400, 400))).toSize()
        self.resize(size)
        self.move(pos)

    def writeSettings(self):
        settings = QtCore.QSettings("Trolltech", "Application Example")
        settings.setValue("pos", QtCore.QVariant(self.pos()))
        settings.setValue("size", QtCore.QVariant(self.size()))

    def maybeSave(self):
        if self.textEdit.document().isModified():
            ret = QtGui.QMessageBox.warning(self, self.tr("Application"),
                        self.tr("The document has been modified.\n"
                                "Do you want to save your changes?"),
                        QtGui.QMessageBox.Yes | QtGui.QMessageBox.Default,
                        QtGui.QMessageBox.No,
                        QtGui.QMessageBox.Cancel | QtGui.QMessageBox.Escape)
            if ret == QtGui.QMessageBox.Yes:
                return self.save()
            elif ret == QtGui.QMessageBox.Cancel:
                return False
        return True

    def loadFile(self, fileName):
        file = QtCore.QFile(fileName)
        if not file.open(QtCore.QFile.ReadOnly | QtCore.QFile.Text):
            QtGui.QMessageBox.warning(self, self.tr("Application"),
                        self.tr("Cannot read file %1:\n%2.").arg(fileName).arg(file.errorString()))
            return

        inf = QtCore.QTextStream(file)
        QtGui.QApplication.setOverrideCursor(QtCore.Qt.WaitCursor)
        self.textEdit.setPlainText(inf.readAll())
        QtGui.QApplication.restoreOverrideCursor()

        self.setCurrentFile(fileName)
        self.statusBar().showMessage(self.tr("File loaded"), 2000)

    def saveFile(self, fileName):
        file = QtCore.QFile(fileName)
        if not file.open(QtCore.QFile.WriteOnly | QtCore.QFile.Text):
            QtGui.QMessageBox.warning(self, self.tr("Application"),
                        self.tr("Cannot write file %1:\n%2.").arg(fileName).arg(file.errorString()))
            return False

        outf = QtCore.QTextStream(file)
        QtGui.QApplication.setOverrideCursor(QtCore.Qt.WaitCursor)
        outf << self.textEdit.toPlainText()
        QtGui.QApplication.restoreOverrideCursor()

        self.setCurrentFile(fileName);
        self.statusBar().showMessage(self.tr("File saved"), 2000)
        return True

    def setCurrentFile(self, fileName):
        self.curFile = fileName
        self.textEdit.document().setModified(False)
        self.setWindowModified(False)

        if self.curFile.isEmpty():
            shownName = "untitled.txt"
        else:
            shownName = self.strippedName(self.curFile)

        self.setWindowTitle(self.tr("%1[*] - %2").arg(shownName).arg(self.tr("Application")))

    def strippedName(self, fullFileName):
        return QtCore.QFileInfo(fullFileName).fileName()


if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    mainWin = MainWindow()
    mainWin.show()
    sys.exit(app.exec_())