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