To achieve your task, you need to combine the qtnodes(https://github.com/cb109/qtnodes) module with Pyqt drag drop code. Below code might help you but you need to read the internal codes of qtnodes. If you can compromise drag drop options, it will be easy for you to build application only with qtnodes.
You can build tool same as Tobie, but you need to write all code from scratch using pyside or pyqt or tkinter.
Drag drop list to graphics Scene
from PyQt4 import QtCore, QtGui
import sys
class GraphicsScene(QtGui.QGraphicsScene):
def __init__(self, parent = None):
super(GraphicsScene, self).__init__(parent)
def dragEnterEvent(self, event):
event.accept()
def dragMoveEvent(self, event):
event.accept()
def dragLeaveEvent(self, event):
event.accept()
def dropEvent(self, event):
text = QtGui.QGraphicsTextItem(event.mimeData().text())
text.setPos(event.scenePos())
self.addItem(text)
event.accept()
class ListView(QtGui.QListView):
def __init__(self, parent = None):
super(ListView, self).__init__(parent)
self.setDragEnabled(True)
def dragEnterEvent(self, event):
event.setDropAction(QtCore.Qt.MoveAction)
event.accept()
def startDrag(self, event):
index = self.indexAt(event.pos())
if not index.isValid():
return
selected = self.model().data(index, QtCore.Qt.DisplayRole)
mimeData = QtCore.QMimeData()
mimeData.setText(selected.toString())
drag = QtGui.QDrag(self)
drag.setMimeData(mimeData)
result = drag.start(QtCore.Qt.MoveAction)
if result: # == QtCore.Qt.MoveAction:
pass
def mouseMoveEvent(self, event):
self.startDrag(event)
class MainWindow(QtGui.QMainWindow):
def __init__(self, parent = None):
super(MainWindow, self).__init__(parent)
self.setGeometry(100, 100, 400, 400)
self.widget = QtGui.QWidget()
self.setCentralWidget(self.widget)
layout = QtGui.QGridLayout(self.widget)
self.ListView = ListView()
data = QtCore.QStringList()
data << "one" << "two" << "three"
self.model = QtGui.QStringListModel(data)
self.ListView.setModel(self.model)
self.GraphicsView = QtGui.QGraphicsView()
self.scene = GraphicsScene()
self.GraphicsView.setScene(self.scene)
#self.GraphicsView.setSceneRect(0, 0, self.GraphicsView.width(), self.GraphicsView.height())
layout.addWidget(self.ListView, 0, 0, 5, 5)
layout.addWidget(self.GraphicsView, 0, 1, 5, 5)
self.show()
self.GraphicsView.setSceneRect(0, 0, self.GraphicsView.width(), self.GraphicsView.height())
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
window = MainWindow()
sys.exit(app.exec_())
Below code is for drag and drop of buttons
from PyQt4 import QtGui, QtCore
class DragButton(QtGui.QPushButton):
def __init__(self, parent):
super(DragButton, self).__init__(parent)
self.allowDrag = True
def setAllowDrag(self, allowDrag):
if type(allowDrag) == bool:
self.allowDrag = allowDrag
else:
raise TypeError("You have to set a boolean type")
def mouseMoveEvent(self, e):
if e.buttons() != QtCore.Qt.RightButton:
return
if self.allowDrag == True:
# write the relative cursor position to mime data
mimeData = QtCore.QMimeData()
# simple string with 'x,y'
mimeData.setText('%d,%d' % (e.x(), e.y()))
print mimeData.text()
# let's make it fancy. we'll show a "ghost" of the button as we drag
# grab the button to a pixmap
pixmap = QtGui.QPixmap.grabWidget(self)
# below makes the pixmap half transparent
painter = QtGui.QPainter(pixmap)
painter.setCompositionMode(painter.CompositionMode_DestinationIn)
painter.fillRect(pixmap.rect(), QtGui.QColor(0, 0, 0, 127))
painter.end()
# make a QDrag
drag = QtGui.QDrag(self)
# put our MimeData
drag.setMimeData(mimeData)
# set its Pixmap
drag.setPixmap(pixmap)
# shift the Pixmap so that it coincides with the cursor position
drag.setHotSpot(e.pos())
# start the drag operation
# exec_ will return the accepted action from dropEvent
if drag.exec_(QtCore.Qt.LinkAction | QtCore.Qt.MoveAction) == QtCore.Qt.LinkAction:
print 'linked'
else:
print 'moved'
def mousePressEvent(self, e):
QtGui.QPushButton.mousePressEvent(self, e)
if e.button() == QtCore.Qt.LeftButton:
print 'press'
#AQUI DEBO IMPLEMENTAR EL MENU CONTEXTUAL
def dragEnterEvent(self, e):
e.accept()
def dropEvent(self, e):
# get the relative position from the mime data
mime = e.mimeData().text()
x, y = map(int, mime.split(','))
# move
# so move the dragged button (i.e. event.source())
print e.pos()
#e.source().move(e.pos()-QtCore.QPoint(x, y))
# set the drop action as LinkAction
e.setDropAction(QtCore.Qt.LinkAction)
# tell the QDrag we accepted it
e.accept()
All the codes i have copied from stack overflow. Go through links below for more details.
Drag n Drop inside QgraphicsView doesn't work (PyQt)
Drag n Drop Button and Drop-down menu PyQt/Qt designer
