qt - When dragging multiple items from QListWidget, non-draggable items get removed -


i have 2 qlistwidgets. user can select multiple items 1 list , drag them other list. within each list, items draggable , not. if selection contains both draggable , non-draggable items, problem happens. draggable items appear in second list, correct. all items disappear first list. animation of items being dragged 1 list another

in animated image above, items 00, 01, , 02 selected. items 00 , 02 drag enabled. after drag-and-drop, 3 items gone first list. how can fix this?

here code reproduce problem:

import random import sys pyside import qtcore, qtgui  class testmultidragdrop(qtgui.qmainwindow):     def __init__(self, parent=none):         super(testmultidragdrop, self).__init__(parent)          centralwidget = qtgui.qwidget()         self.setcentralwidget(centralwidget)          layout = qtgui.qhboxlayout(centralwidget)         self.list1 = qtgui.qlistwidget()         self.list1.setdragdropmode(qtgui.qabstractitemview.dragdrop)         self.list1.setdefaultdropaction(qtcore.qt.moveaction)         self.list1.setselectionmode(qtgui.qlistwidget.extendedselection)          self.list2 = qtgui.qlistwidget()         self.list2.setdragdropmode(qtgui.qabstractitemview.dragdrop)         self.list2.setdefaultdropaction(qtcore.qt.moveaction)         self.list2.setselectionmode(qtgui.qlistwidget.extendedselection)          layout.addwidget(self.list1)         layout.addwidget(self.list2)          self.filllistwidget(self.list1, 8, 'someitem')         self.filllistwidget(self.list2, 4, 'anotheritem')      def filllistwidget(self, listwidget, numitems, txt):         in range(numitems):             item = qtgui.qlistwidgetitem()             newtxt = '{0}{1:02d}'.format(txt, i)             if random.randint(0, 1):                 item.setflags(qtcore.qt.itemisselectable | qtcore.qt.itemisenabled)             else:                 # if item draggable, indicate *                 newtxt += ' *'                 item.setflags(qtcore.qt.itemisselectable | qtcore.qt.itemisenabled | qtcore.qt.itemisdragenabled)             item.settext(newtxt)             listwidget.additem(item)  def openmultidragdrop():     global multidragdropui     try:         multidragdropui.close()     except:         pass     multidragdropui = testmultidragdrop()     multidragdropui.setattribute(qtcore.qt.wa_deleteonclose)     multidragdropui.show()     return multidragdropui  if __name__ == '__main__':     app = qtgui.qapplication([])     openmultidragdrop()     sys.exit(app.exec_())

here have suspicion on setdefaultdropaction(qtcore.qt.moveaction)

read below para documentation: specially bold line

in simplest case, target of drag , drop action receives copy of data being dragged, , source decides whether delete original. described copyaction action. target may choose handle other actions, moveaction , linkaction actions. if source calls qdrag::exec(), , returns moveaction, source responsible deleting original data if chooses so. qmimedata , qdrag objects created source widget should not deleted - destroyed qt.

(http://doc.qt.io/qt-4.8/dnd.html#overriding-proposed-actions)

first give try qtcore.qt.copyaction

second, if moveaction mandatory, try creating qmimedata , qdrag objects in source list widget's mousemoveevent.

here in below link, can find creating qmimedata , qdrag objects in source list widget's mousemoveevent. (code in c++, intention conceptual idea).

http://doc.qt.io/qt-4.8/dnd.html#overriding-proposed-actions


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