如何获取从 qlistwidget 上的 dropEvent 创建的项目

Question

所以我正在尝试使用拖放将所选项目从一个 QListWidget 复制到另一个。

无论如何，我可以通过使用 item.setData 传递序列化参数来破解我需要的东西，但我无法找到一种直接的方法来处理在第二个 listWidget 中创建的新项目。

我想我可以查看第二个 QListWidget 中的所有项目，并以某种方式确定刚刚创建的项目，但似乎应该有一种更简单的方法来了解 drop 事件正在创建哪些项目。

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

您可以连接到列表视图模型上的rowsInserted 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

有趣.. 好吧，我的解决方案最终是将项目列表存储在第二个列表小部件之前，然后在添加新项目后进行比较，这足够好并且只需要几行代码。然后我将新项目传递给一个函数，该函数使用在第一个列表小部件中创建项目时使用的相同类来创建项目，并且我在 .data(QtCore.Qt.UserRole) 中传递了有关的序列化信息

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)