I forgot to add the right code.
I have attached the drag and drop events of the graphicsview and the list.
Executing this code I don't get any errors, but nothing is shown on screen. I
hope someone can explain what I'm doing wrong.
Mads
________________________________
From: Mads <[email protected]>
To: [email protected]
Sent: Tuesday, June 16, 2009 2:09:00 PM
Subject: [PyQt] Dragging a QGraphicsItem from a QListView
Hi list
I have a mainwindow with a dockwidget which holds a QListView displaying a list
of different unique names. Also in the window I have a QGraphicsview. I now
want to be able to drag one of the names displayed in the list onto the view,
and then be displayed as a QGraphicsItem, which is designed as a rectangle. So
the question is how do I get the graphicsview to accept the graphicsitem and
then display it?
I have implemented this dropevent in the graphicsview:
def dropEvent(self, event):
node = item.Item(event.pos(), self.scene)
node.show()
event.accept()
it is being called and calls the graphicsitem, but it is not shown on screen.
What am I doing wrong?
Mads
class View(QGraphicsView):
def __init__(self, parent=None):
super(View, self).__init__(parent)
self.setAcceptDrops(True)
self.setDragMode(QGraphicsView.RubberBandDrag)
self.setRenderHint(QPainter.Antialiasing)
self.setRenderHint(QPainter.TextAntialiasing)
def wheelEvent(self, event):
factor = 1.41 ** (-event.delta() / 240.0)
self.scale(factor, factor)
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("application/x-graphicsItem"):
event.setDropAction(Qt.MoveAction)
event.accept()
else:
event.ignore()
def dragEnterEvent(self, event):
event.accept()
def dropEvent(self, event):
if event.mimeData().hasFormat("application/x-graphicsItem"):
data = event.mimeData().data("application/x-graphicsItem")
self.item = item.Item(event.pos(), self.scene)
event.setDropAction(Qt.CopyAction)
event.accept()
self.updateGeometry()
self.update()
else:
event.ignore()
PointSize = 10
class Item(QGraphicsItem):
def __init__(self, scene, rect = None, style = Qt.SolidLine):
super(Item, self).__init__()
self.setFlags(QGraphicsItem.ItemIsSelectable|
QGraphicsItem.ItemIsMovable|
QGraphicsItem.ItemIsFocusable)
if rect is None:
rect = QRectF(-1 * PointSize, -PointSize,
30 * PointSize, 8 * PointSize)
self.rect = rect
self.style = style
self.setSelected(True)
self.setFocus()
self.setToolTip("Dragged Item")
def setStyle(self, style):
self.style = style
self.update()
def paint(self, painter, option, widget):
pen = QPen(self.style)
pen.setColor(Qt.black)
pen.setWidth(1)
if option.state & QStyle.State_Selected:
pen.setColor(Qt.blue)
painter.setPen(pen)
painter.drawRect(self.rect)
def boundingRect(self):
return self.rect.adjusted(-2, -2, 2, 2)
def dragEnterEvent(self, event):
if event.mimeData().hasFormat("application/x-graphicsItem"):
event.accept()
else:
event.ignore()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("application/x-graphicsItem"):
action = Qt.MoveAction
if event.keyboardModifiers() & Qt.ControlModifier:
action = Qt.CopyAction
event.setDropAction(action)
event.accept()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasFormat("application/x-graphicsItem"):
data = event.mimeData().data("application/x-graphicsItem")
node = item.Item(event.pos(), self.scene)
action = Qt.MoveAction
if event.keyboardModifiers() & Qt.ControlModifier:
action = Qt.CopyAction
event.setDropAction(action)
event.accept()
else:
event.ignore()
def startDrag(self, dropActions):
item = self.currentItem()
data = QByteArray()
mimeData = QMimeData()
mimeData.setData("application/x-graphicsItem", data)
drag = QDrag(self)
drag.setMimeData(mimeData)
if drag.start(Qt.MoveAction|Qt.CopyAction) == Qt.MoveAction:
self.takeItem(self.row(item))
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