Drawing QLabel into QFrame and overlying dragEnterEvent dropEvent and mousePressEven

[jijiz]

Hi everyone,

My english is quite poor... I prefer inform you about it...

So i would like to draw some pictures (cubic, square, lines) into objects (QLabel), and instanciate those objects into a QFrame. It works, but i would like to make my objects (cubic...) movable, so i want to redefines dragEnterEvent dropEvent and mousePressEven into each of objects wich are QLabel, and it doesn't work.

I thought i could write the dragEnterEvent dropEvent and mousePressEven functions into the QFrame and put a different mime type for cubic, square and lines in order to do specific treatment for each drawable objects but it is piggy.

Can you help me to redefines correctly dragEnterEvent dropEvent and mousePressEven into each of the QLabel objects?

Thank you.

Here the code :

 
 
# Display a cubic
class SquareBox(QtGui.QLabel, object):    
    def __init__(self, QP1, parent=None):
        super (SquareBox, self).__init__ (parent)
 
        itemData = QtCore.QByteArray()    
        mimeData = QtCore.QMimeData()
        mimeData.setData("application/x-dnditemdata", itemData)
 
 
        image = QtGui.QImage(QP1.x(), QP1.y(),
                                     QtGui.QImage.Format_ARGB32_Premultiplied)        
        self.rect = QtCore.QRectF(QtCore.QPointF(0.,0.), QtCore.QSizeF(QP1.x(),QP1.y()))
 
        # Drawing the main rectangle
        painter = QtGui.QPainter()
        painter.begin(image)
        painter.setRenderHint(QtGui.QPainter.Antialiasing)
        painter.setPen(QtCore.Qt.black)
        painter.drawLine(QtCore.QPointF(0,0),QtCore.QPointF(QP1.x(),0))
        painter.drawLine(QtCore.QPointF(QP1.x(),0),QP1)
        painter.drawLine(QtCore.QPointF(0,QP1.y()),QP1)
        painter.drawLine(QtCore.QPointF(0,0),QtCore.QPointF(0,QP1.y()))
        self.setPixmap(QtGui.QPixmap.fromImage(image))
        painter.end()
 
    def dragEnterEvent(self, event):
        if (event.mimeData().hasFormat("application/x-dnditemdata")):
            if (event.source()==self):
                event.setDropAction(QtCore.Qt.MoveAction)
                event.accept()
            else:
                event.acceptProposedAction()
        else:
            event.ignore()
 
    def dropEvent(self, event):     
        if (event.mimeData().hasFormat("application/x-dnditemdata")):
            itemData = event.mimeData().data("application/x-dnditemdata")
            dataStream = QtCore.QDataStream(itemData, QtCore.QIODevice.ReadOnly)
            # pixmap = QtGui.QPixmap(item.data(QtCore.Qt.DecorationRole))
            pixmap = QtGui.QPixmap()
            offset = QtCore.QPoint()            
            dataStream >> pixmap >> offset           
            newIcon = QtGui.QLabel(self)
            newIcon.setPixmap(pixmap)
            newIcon.move(event.pos() - offset)
            newIcon.show()
            newIcon.setAttribute(QtCore.Qt.WA_DeleteOnClose)
 
            if (event.source() == self):
                event.setDropAction(QtCore.Qt.MoveAction)
                event.accept()
            else:
                event.acceptProposedAction()
 
        else:
            event.ignore()         
    def mousePressEvent(self,event):
        child = self.childAt(event.pos())
        if (not child):
            return 
 
        pixmap = child.pixmap()
        itemData = QtCore.QByteArray()    
        dataStream = QtCore.QDataStream(itemData, QtCore.QIODevice.WriteOnly)
        dataStream << pixmap << QtCore.QPoint(event.pos() - child.pos())
        mimeData = QtCore.QMimeData()
        mimeData.setData("application/x-dnditemdata", itemData)
 
        print "dans la square box"
        drag = QtGui.QDrag(self)
        drag.setMimeData(mimeData)
        drag.setPixmap(pixmap)
        drag.setHotSpot(event.pos() - child.pos())      
        tempPixmap = QtGui.QPixmap(pixmap)
        child.setPixmap(tempPixmap)      
        if (drag.start(QtCore.Qt.CopyAction | QtCore.Qt.MoveAction) == QtCore.Qt.MoveAction):
            child.close()
        else:
            child.show()
            child.setPixmap(pixmap) 
 
# Display a cubic
class CubicDragable(QtGui.QLabel,object):    
    def __init__(self, QP1, QP2, parent=None):
        super (CubicDragable, self).__init__ (parent)
        self.setAcceptDrops(True)
        # Construct the path
        path = QtGui.QPainterPath()
        path.setFillRule(QtCore.Qt.OddEvenFill)
 
        # Drawing the cubic to gap 2 points             
        if (QP1.x()<QP2.x()):
            # Coordinates of the first control point
            QPc1 = QtCore.QPointF((QP2.x()-QP1.x())/2,QP1.y())
            # Coodinates of the second control point
            QPc2 = QtCore.QPointF((QP2.x()-QP1.x())/2,QP2.y())
        else:
            # Coordinates of the first control point
            QPc1 = QtCore.QPointF((QP1.x()-QP2.x())/2,QP1.y())
            # Coodinates of the second control point
            QPc2 = QtCore.QPointF((QP1.x()-QP2.x())/2,QP2.y())
 
        path.moveTo(QP1)
        path.cubicTo(QPc1,QPc2,QP2)
        path.closeSubpath()
 
        # Area where the path will be drawn
        image = QtGui.QImage(abs(QP1.x()- QP2.x()), abs(QP1.y()- QP2.y()),
                             QtGui.QImage.Format_ARGB32_Premultiplied)
 
        # Start the painting device
        painter = QtGui.QPainter()
        painter.begin(image)
        painter.setRenderHint(QtGui.QPainter.Antialiasing)
 
        # Dawing the path of our cubic
        painter.drawPath(path)
        self.setPixmap(QtGui.QPixmap.fromImage(image))
        painter.end()
 
    def dragEnterEvent(self, event):
        if (event.mimeData().hasFormat("application/x-dnditemdata")):
            if (event.source()==self):
                event.setDropAction(QtCore.Qt.MoveAction)
                print "on est dans le dragableWidget"
                event.accept()
            else:
                event.acceptProposedAction()
        else:
            event.ignore()
 
    def dropEvent(self, event):
        if (event.mimeData().hasFormat("application/x-dnditemdata")):
            itemData = event.mimeData().data("application/x-dnditemdata")
            dataStream = QtCore.QDataStream(itemData, QtCore.QIODevice.ReadOnly)
            pixmap = QtGui.QPixmap()
            offset = QtCore.QPoint()           
            dataStream >> pixmap >> offset            
            newIcon = QtGui.QLabel(self)
            newIcon.setPixmap(pixmap)
            newIcon.move(event.pos() - offset)
            newIcon.show()
            newIcon.setAttribute(QtCore.Qt.WA_DeleteOnClose)
 
            if (event.source() == self):
                event.setDropAction(QtCore.Qt.MoveAction)
                event.accept()
            else:
                event.acceptProposedAction()   
        else:
            event.ignore() 
 
    def mousePressEvent(self,event):
        child = self.childAt(event.pos())
        if (not child):
            return 
 
        pixmap = child.pixmap()
        itemData = QtCore.QByteArray()    
        dataStream = QtCore.QDataStream(itemData, QtCore.QIODevice.WriteOnly)
        dataStream << pixmap << QtCore.QPoint(event.pos() - child.pos())
        mimeData = QtCore.QMimeData()
        mimeData.setData("application/x-dnditemdata", itemData)
        print "entrer dans le cubic dragable"
        drag = QtGui.QDrag(self)
        drag.setMimeData(mimeData)
        drag.setPixmap(pixmap)
        drag.setHotSpot(event.pos() - child.pos())
        tempPixmap = QtGui.QPixmap(pixmap)        
        child.setPixmap(tempPixmap)
 
        if (drag.start(QtCore.Qt.CopyAction | QtCore.Qt.MoveAction) == QtCore.Qt.MoveAction):
            child.close()
        else:
            child.show()
            child.setPixmap(pixmap)  
 
 
# Frame wich allow to drag and drop objects contained in the frame
class DragWidget(QtGui.QFrame,object):
 
    def __init__(self, parent=None):
        QtGui.QFrame.__init__(self, parent)
        self.setMinimumSize(200, 200)
        self.setFrameStyle(QtGui.QFrame.Sunken | QtGui.QFrame.StyledPanel)
        self.setAcceptDrops(True)
        self.setWindowTitle(self.tr("Objets Dragables"))
 
        # ----------------------------
        # Adding of graphicals objects
        # ----------------------------
 
        cd = CubicDragable(QtCore.QPointF(0,0),QtCore.QPointF(100,75),self)
        cd.move(10,10)
        cd.show()
 
        sb = SquareBox(QtCore.QPointF(100,75),self)
        sb.show()
        sb.setAcceptDrops(True)
        help(sb)
 
if __name__ == "__main__":
 
    app = QtGui.QApplication(sys.argv)
    window = DragWidget()
    window.show()
    sys.exit(app.exec_())