如何在qlistwidget上获取从dropEvent创建的项目

Question

So I'm trying to copy a selected item from one QListWidget to another using drag and drop.

Anyway I could probably hack together what I need to by passing serialized parameters using item.setData but I can't figure out a straight forward way to get a handle on the new item being created in the second listWidget.

I guess I could look at all the items in the second QListWidget and somehow determine which one was just created but it seems like there should be an easier way to know which item is being created by the drop event.

import sys
from PyQt4 import QtGui , QtCore


def main():

    app = QtGui.QApplication(sys.argv)

    w = QtGui.QWidget()
    w.resize(250, 150)
    w.move(300, 300)
    w.setWindowTitle('Simple')
    layout=QtGui.QHBoxLayout(w)
    dragList=DragDropListWidget()
    layout.addWidget(dragList)
    dragList.setDragDropMode(QtGui.QAbstractItemView.InternalMove)
    dragList.name='dragList'
    dragList.populate(['one','two','three'])
    dragList2=DragDropListWidget()
    dragList2.setDragDropMode(QtGui.QAbstractItemView.DragDrop)
    dragList2.name='dragList'


    layout.addWidget(dragList2)
    w.show()

    sys.exit(app.exec_())

class scriptsWidget(QtGui.QWidget):


    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self)

        self.name=''

        self.widget_QHBoxLayout = QtGui.QHBoxLayout(self)
        self.widget_QHBoxLayout.setSpacing(0)
        self.widget_QHBoxLayout.setContentsMargins(0, 0, 0, 0)

        self.name_QLabel = QtGui.QLabel(self)
        self.widget_QHBoxLayout.addWidget(self.name_QLabel)

        self.user_QLabel = QtGui.QLabel(self)
        self.widget_QHBoxLayout.addWidget(self.user_QLabel)

        self.widget_QHBoxLayout.setSpacing(0)
        self.widget_QHBoxLayout.setContentsMargins(0, 0, 0, 0)



    def setName(self,name):
        self.name_QLabel.setText(name)
        self.name=name

    def setUser(self,user):
        self.user_QLabel.setText(user)

class customQListWidgetItem(QtGui.QListWidgetItem):


    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self)
        self.name=''

    def setName(self,name):
        self.name=name   




class DragDropListWidget(QtGui.QListWidget):
    _drag_info = []
    def __init__(self, parent = None):

        super(DragDropListWidget, self).__init__(parent)


        self.name=''


    def dragMoveEvent(self, event):
        if event.mimeData().hasUrls():
            event.setDropAction(QtCore.Qt.CopyAction)
            event.accept()

        else:
            super(DragDropListWidget, self).dragMoveEvent(event)


    def dropEvent(self, event):
        print('dropEvent') 
        print event.mimeData().text()

        if event.mimeData().hasText():
            print event.mimeData().text()
            event.setDropAction(QtCore.Qt.CopyAction)
            event.accept()
            links = []
            for url in event.mimeData().urls():
                links.append(str(url.toLocalFile()))
            self.emit(QtCore.SIGNAL("dropped"), links)

        else:
            event.setDropAction(QtCore.Qt.CopyAction)
            super(DragDropListWidget, self).dropEvent(event)
            items = []
            for index in xrange(self.count()):
                items.append(self.item(index))
                print self.item(index).data(QtCore.Qt.UserRole).toPyObject()



    def populate(self,items=[]):
        self.clear()
        for i in items:
            print(i)
            widget = scriptsWidget()
            widget.setName(i)
            widget.setUser('x')
            item = customQListWidgetItem()
            item.setName(i)
            data = (i)
            item.setData(QtCore.Qt.UserRole, data)
            self.addItem(item)
            self.setItemWidget(item,widget)



if __name__ == '__main__':
    main()

Answer 1

You can connect to the rowsInserted signal on the listview model

class DragDropListWidget(...):

    def __init__(...):
        ...
        self._dropping = False
        self.model().rowsInserted.connect(self.on_rowsInserted)

    def on_rowsInserted(self, parent_index, start, end):
        if self._dropping:
            # Recently dropped items
            items = [self.item(i) for i in range(start, end + 1)]

    def dropEvent(self, event):
        self._dropping = True
        # code that drops the new rows
        ...
        self._dropping = False

Answer 2

Interesting .. well my solution ended up being to store a list of items in the second listwidget before and then do a comparison after the new item is added which works well enough and takes only a few lines of code. Then I pass the new item to a function that creates the item using the same classes that were used when it was created in the first listwidget and I passed serialized info about in .data(QtCore.Qt.UserRole)

def dropEvent(self, event):
    if event.mimeData().hasText():
        event.setDropAction(QtCore.Qt.CopyAction)
        event.accept()
        links = []
        for url in event.mimeData().urls():
            links.append(str(url.toLocalFile()))
        self.emit(QtCore.SIGNAL("dropped"), links)

    else:
        event.setDropAction(QtCore.Qt.CopyAction)
        items = []
        for index in xrange(self.count()):
            items.append(self.item(index))

        super(DragDropListWidget, self).dropEvent(event)

        for index in xrange(self.count()):
            if self.item(index) not in items:
                self.populateDrop(self.item(index), index, [self.item(index).data(QtCore.Qt.UserRole).toPyObject()])

def populateDrop(self,item,row,items=[]):
    for i in items:
        widget = scriptsWidget()
        widget.setName(i)
        widget.setUser('x')
        self.takeItem(row)
        item = customQListWidgetItem()
        item.setName(i)
        item.setWhatsThis(i)
        data = (i)
        item.setData(QtCore.Qt.UserRole, data)
        self.insertItem (row, item)
        self.setItemWidget(item,widget)