How can i delete or update the cell of the each grid

Question

Now I want that when a user clicks in a cell of the grid, it becomes editable and he can edit the cell values/images and update the data accordingly.

I don't wish to use the in-built edit, delete and update buttons of grid. How can I do that?please guide me.Thank you in advance given bellow is my code:

import sys
from PyQt4 import QtCore, QtGui


class Setting:
    WIDTH = 80
    HEIGHT = 80

X, Y = 7, 5


class QS(QtGui.QGraphicsScene):
    def __init__(self, parent=None):
        super(QS, self).__init__(QtCore.QRectF(0, 0, X * Setting.WIDTH, Y * Setting.HEIGHT), parent)

    def drawBackground(self, painter, rect):
        width = X * Setting.WIDTH
        height = Y * Setting.HEIGHT

        l = QtCore.QLineF(QtCore.QPointF(0, 0), QtCore.QPointF(width, 0))
        for _ in range(Y+1):
            painter.drawLine(l)
            l.translate(0, Setting.HEIGHT)

        l = QtCore.QLineF(QtCore.QPointF(0, 0), QtCore.QPointF(0, height))
        for _ in range(X+1):
            painter.drawLine(l)
            l.translate(Setting.WIDTH, 0)

        pixmap = QtGui.QPixmap("checkmark.png").scaled(Setting.WIDTH, 
            Setting.HEIGHT, 
            QtCore.Qt.IgnoreAspectRatio,
            QtCore.Qt.SmoothTransformation)

        p = QtCore.QPointF()
        for i in range(X):
            p = QtCore.QPointF(Setting.WIDTH*i, 0)
            for j in range(Y):
                painter.drawPixmap(p, pixmap)
                p += QtCore.QPointF(0, Setting.HEIGHT)
    def mousePressEvent(self,evnt):
        # print event
        # print(dir(evnt))
        print evnt.screenPos().x()
        print evnt.screenPos().y()
        self.ix = int(evnt.screenPos().x()/Setting.WIDTH)
        self.ix = int(evnt.screenPos().y()/Setting.HEIGHT)
        print self.ix,self.iy




class QV(QtGui.QGraphicsView):
    pass


class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        scene = QS(self)
        view = QV(scene)
        self.setCentralWidget(view)


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

Answer 1

The most common way to establish options is to use a context menu, in it you create a menu where you add the QActions, and depending on the selection of the corresponding QAction will return, depending on the choice you must change the image or delete it as shown below (Take in when to draw the figures I used items):

import sys
from PyQt4 import QtCore, QtGui


class Setting:
    WIDTH = 80
    HEIGHT = 80

X, Y = 7, 5


class QS(QtGui.QGraphicsScene):
    def __init__(self, parent=None):
        super(QS, self).__init__(QtCore.QRectF(0, 0, X * Setting.WIDTH, Y * Setting.HEIGHT), parent)

        pixmap = QtGui.QPixmap("checkmark.png").scaled(Setting.WIDTH, Setting.HEIGHT,
            QtCore.Qt.IgnoreAspectRatio,
            QtCore.Qt.SmoothTransformation)

        for i in range(X):
            p = QtCore.QPointF(Setting.WIDTH*i, 0)
            for j in range(Y):
                item = self.addPixmap(pixmap)
                item.setPos(p)
                p += QtCore.QPointF(0, Setting.HEIGHT)

    def drawBackground(self, painter, rect):
        width = X * Setting.WIDTH
        height = Y * Setting.HEIGHT

        l = QtCore.QLineF(QtCore.QPointF(0, 0), QtCore.QPointF(width, 0))
        for _ in range(Y+1):
            painter.drawLine(l)
            l.translate(0, Setting.HEIGHT)

        l = QtCore.QLineF(QtCore.QPointF(0, 0), QtCore.QPointF(0, height))
        for _ in range(X+1):
            painter.drawLine(l)
            l.translate(Setting.WIDTH, 0)


class QV(QtGui.QGraphicsView):
    def __init__(self, parent=None):
        super(QV, self).__init__(parent)
        self.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        self.customContextMenuRequested.connect(self.on_customContextMenuRequested)

    def on_customContextMenuRequested(self, pos):
        items = self.items(pos)
        if items:
            menu = QtGui.QMenu()

            change_action = menu.addAction("Change image")
            delete_action = menu.addAction("Delete")

            action  = menu.exec(self.mapToGlobal(pos))

            if action is change_action:
                filename = QtGui.QFileDialog.getOpenFileName(self,
                    "Open Image", QtCore.QDir.currentPath() , "Image Files (*.png *.jpg *.bmp)")
                if filename:
                    pixmap = QtGui.QPixmap(filename)
                    if not pixmap.isNull():
                        pixmap = pixmap.scaled(Setting.WIDTH, Setting.HEIGHT,
                            QtCore.Qt.IgnoreAspectRatio, QtCore.Qt.SmoothTransformation)
                        for item in items:
                            if isinstance(item, QtGui.QGraphicsPixmapItem):
                                item.setPixmap(pixmap)

            elif action is delete_action:
                for it in reversed(items):
                    self.scene().removeItem(it)
                    del it


class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        scene = QS(self)
        view = QV(scene)
        self.setCentralWidget(view)


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