我（简单地）希望能够使用QTableView的拖放机制来移动现有行。我发现了很多资料（例如here，here或here），它们描述了[[some拖放，插入，插入等方面，但我仍在努力使其适用于我的情况。] >这是我正在寻找的解决方案应具备的能力：
QStandardItemModel而不是QAbstractTableModel，它对我来说似乎是半最佳的，因为我必须对'镜像'数据进行操作QStandardItem所需的基于QStandardItemModel的结构（对吗？）下面是代表我当前进度的代码。
目前，我看到两种可能的方法：方法1
：针对QAbstractTableModel实施并实施所有必需的事件/插槽以修改基础数据结构：*专家：最通用的方法*专业人士：无冗余数据*缺点：我不知道如何了解完成的拖放操作操作以及什么索引移到了哪里在我添加的代码中，我跟踪了我所知道的所有相关方法，并输出了所有参数。这是将第2行拖到第3行时得到的结果
dropMimeData(data: ['application/x-qabstractitemmodeldatalist'], action: 2, row: -1, col: -1, parent: '(row: 2, column: 0, valid: True)')
insertRows(row=-1, count=1, parent=(row: 2, column: 0, valid: True))
setData(index=(row: 0, column: 0, valid: True), value='^line1', role=0)
setData(index=(row: 0, column: 1, valid: True), value=1, role=0)
removeRows(row=1, count=1, parent=(row: -1, column: -1, valid: False))
此输出为我提出以下问题：
为什么不调用
moveRow/moveRows？什么时候会被称为？
insertRow / removeRow而是只叫insertRows / removeRows？-1的行索引是什么意思？dropMimeData中提供的哑剧数据？我以后是否应该使用它来复制数据？QStandardItemModel并与QStandardItemModel管理的数据并行地修改您的数据。*专家：有working example*相反：您管理的冗余数据结构必须一致与另一个内部管理的数据结构。*相反：完全没有找到如何执行此操作]这是我目前使用QAbstractTableModel的方法：
from PyQt5 import QtWidgets, QtCore, QtGui
class MyModel(QtCore.QAbstractTableModel):
def __init__(self, data, parent=None, *args):
super().__init__(parent, *args)
self._data = data
def columnCount(self, parent):
return 2
def rowCount(self, parent):
return len(self._data)
def headerData(self, column: int, orientation, role: QtCore.Qt.ItemDataRole):
return (('Regex', 'Category')[column]
if role == QtCore.Qt.DisplayRole and orientation == QtCore.Qt.Horizontal
else None)
def data(self, index, role: QtCore.Qt.ItemDataRole):
if role not in {QtCore.Qt.DisplayRole, QtCore.Qt.EditRole}:
return None
print("data(index=%s, role=%r)" % (self._index2str(index), self._role2str(role)))
return (self._data[index.row()][index.column()]
if index.isValid()
and role in {QtCore.Qt.DisplayRole, QtCore.Qt.EditRole}
and index.row() < len(self._data)
else None)
def setData(self, index: QtCore.QModelIndex, value, role: QtCore.Qt.ItemDataRole):
print("setData(index=%s, value=%r, role=%r)" % (self._index2str(index), value, role))
return super().setData(index, value, role)
def flags(self, index):
return (
super().flags(index)
| QtCore.Qt.ItemIsDropEnabled
| (QtCore.Qt.ItemIsEditable | QtCore.Qt.ItemIsDragEnabled)
if index.isValid() else QtCore.Qt.NoItemFlags)
def dropMimeData(self, data, action, row, col, parent: QtCore.QModelIndex):
"""Always move the entire row, and don't allow column 'shifting'"""
print("dropMimeData(data: %r, action: %r, row: %r, col: %r, parent: %r)" % (
data.formats(), action, row, col, self._index2str(parent)))
assert action == QtCore.Qt.MoveAction
return super().dropMimeData(data, action, row, 0, parent)
def supportedDragActions(self):
return QtCore.Qt.MoveAction
def supportedDropActions(self):
return QtCore.Qt.MoveAction | QtCore.Qt.CopyAction
def removeRow(self, row: int, parent=None):
print("removeRow(row=%r):" % (row))
return super().removeRow(row, parent)
def removeRows(self, row: int, count: int, parent=None):
print("removeRows(row=%r, count=%r, parent=%s)" % (row, count, self._index2str(parent)))
return super().removeRows(row, count, parent)
def insertRow(self, index, parent=None):
print("insertRow(row=%r, count=%r):" % (row, count))
return super().insertRow(row, count, parent)
def insertRows(self, row: int, count: int, parent: QtCore.QModelIndex = None):
print("insertRows(row=%r, count=%r, parent=%s)" % (row, count, self._index2str(parent)))
return super().insertRows(row, count, parent)
@staticmethod
def _index2str(index):
return "(row: %d, column: %d, valid: %r)" % (index.row(), index.column(), index.isValid())
@staticmethod
def _role2str(role: QtCore.Qt.ItemDataRole) -> str:
return "%s (%d)" % ({
QtCore.Qt.DisplayRole: "DisplayRole",
QtCore.Qt.DecorationRole: "DecorationRole",
QtCore.Qt.EditRole: "EditRole",
QtCore.Qt.ToolTipRole: "ToolTipRole",
QtCore.Qt.StatusTipRole: "StatusTipRole",
QtCore.Qt.WhatsThisRole: "WhatsThisRole",
QtCore.Qt.SizeHintRole: "SizeHintRole",
QtCore.Qt.FontRole: "FontRole",
QtCore.Qt.TextAlignmentRole: "TextAlignmentRole",
QtCore.Qt.BackgroundRole: "BackgroundRole",
#QtCore.Qt.BackgroundColorRole:
QtCore.Qt.ForegroundRole: "ForegroundRole",
#QtCore.Qt.TextColorRole
QtCore.Qt.CheckStateRole: "CheckStateRole",
QtCore.Qt.InitialSortOrderRole: "InitialSortOrderRole",
}[role], role)
class MyTableView(QtWidgets.QTableView):
class DropmarkerStyle(QtWidgets.QProxyStyle):
def drawPrimitive(self, element, option, painter, widget=None):
"""Draw a line across the entire row rather than just the column we're hovering over.
This may not always work depending on global style - for instance I think it won't
work on OSX."""
if element == self.PE_IndicatorItemViewItemDrop and not option.rect.isNull():
option_new = QtWidgets.QStyleOption(option)
option_new.rect.setLeft(0)
if widget:
option_new.rect.setRight(widget.width())
option = option_new
super().drawPrimitive(element, option, painter, widget)
def __init__(self):
super().__init__()
self.setStyle(self.DropmarkerStyle())
# only allow rows to be selected
self.setSelectionBehavior(QtWidgets.QAbstractItemView.SelectRows)
# disallow multiple rows to be selected
self.setSelectionMode(QtWidgets.QAbstractItemView.SingleSelection)
self.setDragEnabled(True)
self.setDragDropMode(QtWidgets.QAbstractItemView.InternalMove)
self.setDropIndicatorShown(True) # default
self.setAcceptDrops(False) # ?
self.viewport().setAcceptDrops(True) # ?
self.setDragDropOverwriteMode(False)
class HelloWindow(QtWidgets.QMainWindow):
def __init__(self) -> None:
super().__init__()
model = MyModel([("^line0", 0),
("^line1", 1),
("^line2", 2),
("^line3", 3)])
table_view = MyTableView()
table_view.setModel(model)
table_view.verticalHeader().hide()
table_view.setShowGrid(False)
self.setCentralWidget(table_view)
def main():
app = QtWidgets.QApplication([])
window = HelloWindow()
window.show()
app.exec_()
if __name__ == "__main__":
main()
我（简单地）希望能够使用QTableViews拖放机制来移动现有行。我发现了很多来源（例如，此处，此处或此处），这些资源描述了拖放，...