Question

我有一个自定义的QListView：

from PyQt4.QtCore import *
from PyQt4.QtGui import *

from Diagnostics import Trace2 #writes to log file
import traceback

class ListOrderView(QListView):

    itemMoved = pyqtSignal(int, int, QStandardItem) # Old index, new index, item 

    def __init__(self, parent=None):
        try:
            super(ListOrderView, self).__init__(parent)

            self.setAcceptDrops(True)
            self.setDragEnabled(True)
            self.setDragDropMode(QAbstractItemView.InternalMove)
            self.setDefaultDropAction(Qt.MoveAction)

            self.setEditTriggers(QAbstractItemView.NoEditTriggers)
            self.setSelectionBehavior(QAbstractItemView.SelectRows)
            self.setSelectionMode(QAbstractItemView.SingleSelection)

            self.dragItem = None
            self.dragRow = None

            self.indexesMoved.connect(self.onIndexesMoved)
            #self.installEventFilter(self)
        except:
            Trace2.WriteLine(str(traceback.format_exc()))

    def onIndexesMoved(self, indexes):
        Trace2.WriteLine("indexes were moved")

    def dropEvent(self, event): 
        try:
            super(ListOrderView, self).dropEvent(event) 

            self.selectionModel().setCurrentIndex(self.model().indexFromItem(self.dragItem), QItemSelectionModel.SelectCurrent)
            Trace2.WriteLine("[LISTVIEW] item dropped")
            Trace2.WriteLine("[LISTVIEW] current index is %d" %self.selectionModel().currentIndex().row())
            Trace2.WriteLine("[LISTVIEW] current selection is %d" %self.selectionModel().selection().indexes()[0].row())

            self.itemMoved.emit(self.dragRow, self.row(self.dragItem), self.dragItem)
            self.dragItem = None
        except:
            Trace2.WriteLine(str(traceback.format_exc()))

    def startDrag(self, supportedActions): 
        try:
            self.dragItem = self.currentItem() 
            self.dragRow = self.row(self.dragItem) 
            super(ListOrderView, self).startDrag(Qt.MoveAction)
        except:
            Trace2.WriteLine(str(traceback.format_exc()))

    def currentItem(self):
        index = self.currentIndex()
        item = self.model().itemFromIndex(index)
        #Trace2.WriteLine("[LISTVIEW] currentItem = %s" % item.data(Qt.DisplayRole).toString())
        return item

    def row(self, item):
        #index = self.model().indexFromItem(item)
        index = self.selectedIndexes()[0]
        row = index.row()

        #Trace2.WriteLine("[LISTVIEW] row = %d" %row)
        return row

我真的需要知道在拖放操作后项目被丢弃的位置，以便其他东西可以正确更新（我试图拖放到从未设计过的东西，大应用程序，而不是我的设计）。选择模型的当前索引和选择不遵循被删除的项目，它们留下来有效地选择新项目并搞砸了。有没有办法让它们与掉落的物品一起移动？信号indicesMoved似乎与我想要的完全一样，但它永远不会发射。我用错了吗？是否有不同/更好的方式？

Answer 1

我认为您可能需要让模型告诉您哪些内容被删除，因为它最终将处理此移动：

class Model(QStandardItemModel):

    rowDropped = pyqtSignal(int)

    def dropMimeData(self, *args):
        success =  super(Model, self).dropMimeData(*args)
        if success:
            self.rowDropped.emit(args[2])
        return success

这将从模型中发出丢弃发生的行号。您的视图已经知道哪个项目是从自己的事件中拖放的。

我确信在跟踪对象方面还有其他方法，然后在完成删除后再次查询它。

如何判断qlistview中项目的删除位置？

1 个答案: