Python 无法从行插入信号获取数据
我使用的是Python 3.4.3和PyQt 5.4.2,在尝试从rowsinerted信号获取数据时遇到了一些问题 我想在删除操作后从删除项附近的所有项中获取数据 下面是我的一些代码(整个模型类太大,希望这部分足够): 此代码打印所有项目的有效数据,不包括删除的项目。对于丢弃的项目,它打印“无”。在QTreeView中拖放后,所有数据都正常。怎么了Python 无法从行插入信号获取数据,python,qt,pyqt,Python,Qt,Pyqt,我使用的是Python 3.4.3和PyQt 5.4.2,在尝试从rowsinerted信号获取数据时遇到了一些问题 我想在删除操作后从删除项附近的所有项中获取数据 下面是我的一些代码(整个模型类太大,希望这部分足够): 此代码打印所有项目的有效数据,不包括删除的项目。对于丢弃的项目,它打印“无”。在QTreeView中拖放后,所有数据都正常。怎么了 对不起,我的英语不好。似乎行插入信号在插入行之后发出,但在模型填充插入行中的数据之前发出。 所以我从dropMimeData函数调用printSo
对不起,我的英语不好。似乎行插入信号在插入行之后发出,但在模型填充插入行中的数据之前发出。 所以我从dropMimeData函数调用printSomeData函数(在数据被删除之后),它就工作了 以下是更正代码:
class PlModel(QtGui.QStandardItemModel):
def __init__(self):
QtGui.QStandardItemModel.__init__(self)
# no need for connect
#self.rowsInserted.connect(self.printSomeData)
def supportedDragActions(self):
return QtCore.Qt.MoveAction
def supportedDropActions(self):
return QtCore.Qt.CopyAction | QtCore.Qt.MoveAction
def canDropMimeData(self, QMimeData, Qt_DropAction, p_int, p_int_1, QModelIndex):
if not self.itemFromIndex(QModelIndex) and p_int_1 == p_int == -1:
return False
elif QModelIndex.isValid():
if self.item(self.itemFromIndex(QModelIndex).row(), 0) is None:
return False
else:
return QtGui.QStandardItemModel.canDropMimeData(self, QMimeData, Qt_DropAction, p_int, p_int_1, QModelIndex)
else:
return QtGui.QStandardItemModel.canDropMimeData(self, QMimeData, Qt_DropAction, p_int, p_int_1, QModelIndex)
def dropMimeData(self, mimedata, dropaction, row, col, modelindex):
if not self.itemFromIndex(modelindex):
if row == col == -1:
return False
else:
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, row, 0, self.index(row, 0))
if result:
self.printSomeData(self.index(row, 0))
return result
elif self.itemFromIndex(modelindex).isDragEnabled():
if row == col == -1:
crow = self.item(modelindex.row(), 0).rowCount()
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, crow, 0, self.indexFromItem(self.item(modelindex.row(), 0)))
if result:
self.printSomeData(self.indexFromItem(self.item(modelindex.row(), 0)))
return result
else:
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, row, 0, modelindex)
if result:
self.printSomeData(modelindex)
return result
elif self.itemFromIndex(modelindex).isDropEnabled():
if col != -1:
return False
else:
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, row, 0, modelindex)
if result:
self.printSomeData(modelindex)
return result
else:
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, row, 0, modelindex)
if result:
self.printSomeData(modelindex)
return result
def printSomeData(self, ind: QtCore.QModelIndex):
row = ind.row()
item = self.itemFromIndex(ind)
for i in range(0, item.rowCount()):
print(self.index(i, 0, ind).data(QtCore.Qt.DisplayRole))
drop操作是如何工作的?如果有一个@tmoreau,这会有帮助。我试图扩展我的代码示例。不幸的是,模型类太大,并且依赖于程序的其他部分。
class PlModel(QtGui.QStandardItemModel):
def __init__(self):
QtGui.QStandardItemModel.__init__(self)
# no need for connect
#self.rowsInserted.connect(self.printSomeData)
def supportedDragActions(self):
return QtCore.Qt.MoveAction
def supportedDropActions(self):
return QtCore.Qt.CopyAction | QtCore.Qt.MoveAction
def canDropMimeData(self, QMimeData, Qt_DropAction, p_int, p_int_1, QModelIndex):
if not self.itemFromIndex(QModelIndex) and p_int_1 == p_int == -1:
return False
elif QModelIndex.isValid():
if self.item(self.itemFromIndex(QModelIndex).row(), 0) is None:
return False
else:
return QtGui.QStandardItemModel.canDropMimeData(self, QMimeData, Qt_DropAction, p_int, p_int_1, QModelIndex)
else:
return QtGui.QStandardItemModel.canDropMimeData(self, QMimeData, Qt_DropAction, p_int, p_int_1, QModelIndex)
def dropMimeData(self, mimedata, dropaction, row, col, modelindex):
if not self.itemFromIndex(modelindex):
if row == col == -1:
return False
else:
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, row, 0, self.index(row, 0))
if result:
self.printSomeData(self.index(row, 0))
return result
elif self.itemFromIndex(modelindex).isDragEnabled():
if row == col == -1:
crow = self.item(modelindex.row(), 0).rowCount()
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, crow, 0, self.indexFromItem(self.item(modelindex.row(), 0)))
if result:
self.printSomeData(self.indexFromItem(self.item(modelindex.row(), 0)))
return result
else:
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, row, 0, modelindex)
if result:
self.printSomeData(modelindex)
return result
elif self.itemFromIndex(modelindex).isDropEnabled():
if col != -1:
return False
else:
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, row, 0, modelindex)
if result:
self.printSomeData(modelindex)
return result
else:
result = QtGui.QStandardItemModel.dropMimeData(self, mimedata, dropaction, row, 0, modelindex)
if result:
self.printSomeData(modelindex)
return result
def printSomeData(self, ind: QtCore.QModelIndex):
row = ind.row()
item = self.itemFromIndex(ind)
for i in range(0, item.rowCount()):
print(self.index(i, 0, ind).data(QtCore.Qt.DisplayRole))