scribbletestapp.py

#!/usr/bin/python3 

from PyQt5.QtWidgets import QAction, QMenu, QMainWindow, QApplication, QMessageBox, QFileDialog, QInputDialog
from PyQt5.QtGui import QImage, QImageWriter
from PyQt5.QtCore import QDir

from ubuscribble.scribble import Scribble

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()

        self.saveAsActs = []

        self.scribble= Scribble()
        self.setCentralWidget(self.scribble)

        self.createActions()
        self.createMenus()

        self.setWindowTitle("Scribble")
        self.resize(500, 500)

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

    def open(self):
        if self.maybeSave():
            fileName, _ = QFileDialog.getOpenFileName(self, "Open File",
                    QDir.currentPath())
            if fileName:
                self.scribble.openImage(fileName)

    def save(self):
        action = self.sender()
        fileFormat = action.data()
        self.saveFile(fileFormat)

    def penColor(self):
        newColor = QColorDialog.getColor(self.scribble.penColor())
        if newColor.isValid():
            self.scribble.setPenColor(newColor)

    def penWidth(self):
        newWidth, ok = QInputDialog.getInt(self, "Scribble",
                "Select pen width:", self.scribble.penWidth(), 1, 50, 1)
        if ok:
            self.scribble.setPenWidth(newWidth)

    def about(self):
        QMessageBox.about(self, "About Scribble",
                "<p>The <b>Scribble</b> example shows how to use "
                "QMainWindow as the base widget for an application, and how "
                "to reimplement some of QWidget's event handlers to receive "
                "the events generated for the application's widgets:</p>"
                "<p> We reimplement the mouse event handlers to facilitate "
                "drawing, the paint event handler to update the application "
                "and the resize event handler to optimize the application's "
                "appearance. In addition we reimplement the close event "
                "handler to intercept the close events before terminating "
                "the application.</p>"
                "<p> The example also demonstrates how to use QPainter to "
                "draw an image in real time, as well as to repaint "
                "widgets.</p>")

    def createActions(self):
        self.openAct = QAction("&Open...", self, shortcut="Ctrl+O",
                triggered=self.open)

        for format in QImageWriter.supportedImageFormats():
            format = str(format)

            text = format.upper() + "..."

            action = QAction(text, self, triggered=self.save)
            action.setData(format)
            self.saveAsActs.append(action)

        self.printAct = QAction("&Print...", self,
                triggered=self.scribble.print_)

        self.exitAct = QAction("E&xit", self, shortcut="Ctrl+Q",
                triggered=self.close)

        self.penColorAct = QAction("&Pen Color...", self,
                triggered=self.penColor)

        self.penWidthAct = QAction("Pen &Width...", self,
                triggered=self.penWidth)

        self.clearScreenAct = QAction("&Clear Screen", self, shortcut="Ctrl+L",
                triggered=self.scribble.clearImage)

        self.aboutAct = QAction("&About", self, triggered=self.about)

        self.aboutQtAct = QAction("About &Qt", self,
                triggered=QApplication.instance().aboutQt)

    def createMenus(self):
        self.saveAsMenu = QMenu("&Save As", self)
        for action in self.saveAsActs:
            self.saveAsMenu.addAction(action)

        fileMenu = QMenu("&File", self)
        fileMenu.addAction(self.openAct)
        fileMenu.addMenu(self.saveAsMenu)
        fileMenu.addAction(self.printAct)
        fileMenu.addSeparator()
        fileMenu.addAction(self.exitAct)

        optionMenu = QMenu("&Options", self)
        optionMenu.addAction(self.penColorAct)
        optionMenu.addAction(self.penWidthAct)
        optionMenu.addSeparator()
        optionMenu.addAction(self.clearScreenAct)

        helpMenu = QMenu("&Help", self)
        helpMenu.addAction(self.aboutAct)
        helpMenu.addAction(self.aboutQtAct)

        self.menuBar().addMenu(fileMenu)
        self.menuBar().addMenu(optionMenu)
        self.menuBar().addMenu(helpMenu)

    def maybeSave(self):
        if self.scribble.isModified():
            ret = QMessageBox.warning(self, "Scribble",
                        "The image has been modified.\n"
                        "Do you want to save your changes?",
                        QMessageBox.Save | QMessageBox.Discard |
                        QMessageBox.Cancel)
            if ret == QMessageBox.Save:
                return self.saveFile('png')
            elif ret == QMessageBox.Cancel:
                return False

        return True

    def saveFile(self, fileFormat):
        initialPath = QDir.currentPath() + '/untitled.' + fileFormat

        fileName, _ = QFileDialog.getSaveFileName(self, "Save As", initialPath,
                "%s Files (*.%s);;All Files (*)" % (fileFormat.upper(), fileFormat))
        if fileName:
            return self.scribble.saveImage(fileName, fileFormat)

        return False


if __name__ == '__main__':

    import sys

    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
sys.exit(app.exec_())