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
而且我真的需要知道拖放操作后该项目被放置在哪里,以便可以正确更新其他内容(我试图将拖放放入从未为其设计的东西中,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会跟随丢弃的项目,它们会有效地选择新项目并把事情搞砸。有没有办法让他们随着掉落的元素一起移动?信号indexMoved 看起来与我想要的一模一样,但它永远不会触发。难道是我用错了?有不同/更好的方法吗?
最佳答案
我认为你可能需要让模型告诉你东西被扔到了哪里,因为它最终会处理移动:
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
这将从模型中发出发生放置的行号。您的 View 已经知道哪个项目从其自己的事件中被拖放。
我确信还有其他方法可以跟踪对象,然后在放置完成后再次查询它。
关于python - 如何判断 qlistview 中的项目被放置在何处?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12846509/