如何获取从qlistwidg上的dropEvent创建的项

Question

因此，我尝试使用拖放将所选项目从一个QListWidget复制到另一个。在

无论如何，我可以通过使用项目设置数据但是我无法找到一种直接的方法来处理在第二个listWidget中创建的新项。在

我想我可以查看第二个QListWidget中的所有项，并以某种方式确定刚才创建了哪个项，但似乎应该有一种更简单的方法来知道drop事件正在创建哪个项。在

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

您可以连接到listview模型上的^{}信号

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

有意思。。好吧，我的解决方案是在前面的第二个listwidget中存储一个条目列表，然后在添加新条目之后进行比较，这就足够了，只需要几行代码。然后，我将新项传递给一个函数，该函数使用在第一个listwidget中创建该项时使用的类创建该项，并传递有关in.data的序列化信息(QtCore.Qt.UserRole)在

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)