[英]How to insert and remove row from model linked to QTableView
The removeRows()
works as intended by deleting the selected row. removeRows()
通过删除所选行按预期工作。 But there is a problem with insertRows()
. 但是
insertRows()
存在问题。 By some reason the new items do not appear at the index-number selected. 由于某种原因,新项目不会出现在所选索引编号处。 What causes this problem?
是什么导致此问题?
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
class Model(QAbstractTableModel):
def __init__(self, parent=None, *args):
QAbstractTableModel.__init__(self, parent, *args)
self.items = ['Item_003','Item_000','Item_005','Item_004','Item_001']
self.numbers=[20,10,30,50,40]
self.added=0
def rowCount(self, parent=QModelIndex()):
return len(self.items)
def columnCount(self, parent=QModelIndex()):
return 2
def data(self, index, role):
if not index.isValid(): return QVariant()
elif role != Qt.DisplayRole:
return QVariant()
row=index.row()
column=index.column()
if column==0:
if row<len(self.items):
return QVariant(self.items[row])
elif column==1:
if row<len(self.numbers):
return QVariant( self.numbers[row] )
else:
return QVariant()
def removeRows(self, row, rows=1, index=QModelIndex()):
print "Removing at row: %s"%row
self.beginRemoveRows(QModelIndex(), row, row + rows - 1)
self.items = self.items[:row] + self.items[row + rows:]
self.endRemoveRows()
return True
def insertRows(self, row, rows=1, index=QModelIndex()):
print "Inserting at row: %s"%row
self.beginInsertRows(QModelIndex(), row, row + rows - 1)
for row in range(rows):
self.items.insert(row + row, "New Item %s"%self.added)
self.added+=1
self.endInsertRows()
return True
class Proxy(QSortFilterProxyModel):
def __init__(self):
super(Proxy, self).__init__()
class MyWindow(QWidget):
def __init__(self, *args):
QWidget.__init__(self, *args)
vLayout=QVBoxLayout(self)
self.setLayout(vLayout)
hLayout=QHBoxLayout()
vLayout.insertLayout(0, hLayout)
tableModel=Model(self)
proxyA=Proxy()
proxyA.setSourceModel(tableModel)
proxyB=Proxy()
proxyB.setSourceModel(tableModel)
self.ViewA=QTableView(self)
self.ViewA.setModel(proxyA)
self.ViewA.clicked.connect(self.viewClicked)
self.ViewA.setSortingEnabled(True)
self.ViewA.sortByColumn(0, Qt.AscendingOrder)
self.ViewB=QTableView(self)
self.ViewB.setModel(proxyB)
self.ViewB.clicked.connect(self.viewClicked)
self.ViewB.setSortingEnabled(True)
self.ViewB.sortByColumn(0, Qt.AscendingOrder)
hLayout.addWidget(self.ViewA)
hLayout.addWidget(self.ViewB)
insertButton=QPushButton('Insert Row Above Selection')
insertButton.setObjectName('insertButton')
insertButton.clicked.connect(self.buttonClicked)
removeButton=QPushButton('Remove Selected Item')
removeButton.setObjectName('removeButton')
removeButton.clicked.connect(self.buttonClicked)
vLayout.addWidget(insertButton)
vLayout.addWidget(removeButton)
def viewClicked(self, indexClicked):
print 'indexClicked() row: %s column: %s'%(indexClicked.row(), indexClicked.column() )
proxy=indexClicked.model()
def buttonClicked(self):
button=self.sender()
if not button: return
tableView=None
if self.ViewA.hasFocus(): tableView=self.ViewA
elif self.ViewB.hasFocus(): tableView=self.ViewB
if not tableView: return
indexes=tableView.selectionModel().selectedIndexes()
for index in indexes:
if not index.isValid(): continue
if button.objectName()=='removeButton':
tableView.model().removeRows(index.row(), 1, QModelIndex())
elif button.objectName()=='insertButton':
tableView.model().insertRows(index.row(), 1, QModelIndex())
if __name__ == "__main__":
app = QApplication(sys.argv)
w = MyWindow()
w.show()
sys.exit(app.exec_())
Mistake was in insertRows()
method. 错误是在
insertRows()
方法中。 The incoming row
argument variable (which is selected QModelIndex.row()
number) was accidentally re-declared in for loop
: 意外在
for loop
重新声明了传入的row
参数变量(已选择QModelIndex.row()
号):
for row in range(rows):
I've renamed the argument row
variable to postion
and the fixed working code is posted below (the proxyB
sorting attribute was commented out. It displays the ViewB
items as unsorted. This way it is easier to see a "real" items order: 我已经改名为参数
row
变量postion
和固定的工作代码下面贴(在proxyB
。分类属性被注释掉它显示ViewB
。项目作为未分类的这种方式很容易看到一个“真实”的项目订单:
There was a few more tweaks made to the code. 对代码进行了一些其他调整。 There is a lot happening "behind of scenes": before or after
insertRows()
and removeRows()
do their job. “幕后”发生了很多事情:在
insertRows()
和removeRows()
insertRows()
之前或之后。
For example: 例如:
When we call these methods the first argument supplied must be a QModelIndex
's row number. 当我们调用这些方法时,提供的第一个参数必须是
QModelIndex
的行号。 It is going to be used by the methods as a "starting point" or "starting row number" from where the indexes will be added (inserted) or removed: as many as the second integer argument says. 方法将使用它作为“起点”或“起点行号”,从该起点将添加(插入)或删除索引:与第二个整数参数说的一样多。
As we know the proxy model
's modelIndexes
s row and column numbers do not match to the associated with them the sourceModel
's modelIndexes. 众所周知,
proxy model
的modelIndexes
的行号和列号与与之关联的sourceModel
的modelIndexes不匹配。 Interesting but there is a translation from proxy
's row numbers to sourceModel
's ones before the row-number-argument is even received by those two methods. 有趣的是,在这两种方法甚至没有接收到行号参数之前,存在从
proxy
的行号到sourceModel
的转换。 It can be seen from a print out: the buttonClicked()
method "sends" row 0 while the insertRows()
method prints out that it received other than 0 row number (if it was supplied an modelIndex "taken" from by-Proxy-driven TableView with sorting or filtering enabled and active). 从打印输出中可以看出:
buttonClicked()
方法“发送”第0行,而insertRows()
方法打印出它接收的行号不是0(如果是从by-Proxy-驱动的TableView,并启用并启用了排序或过滤功能)。
Aside from it there is some "intricate" mechanism happening on how these two methods remove or pop the data from the model
's self.items
variable. 除此之外,这两种方法如何从
model
的self.items
变量中删除或弹出数据,还存在一些“复杂”的机制。 removeRows()
method kind of "returns" back to itself to finish a job if the row numbers do not follow in a sequence. 如果行号未按顺序排列,则
removeRows()
方法会“返回”自身以完成作业。 The fully working code is posted below: 完整的工作代码如下:
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
class Model(QAbstractTableModel):
def __init__(self, parent=None, *args):
QAbstractTableModel.__init__(self, parent, *args)
self.items = ['Item_A000','Item_B001','Item_A002','Item_B003','Item_B004']
self.numbers=[20,10,30,50,40]
self.added=0
def rowCount(self, parent=QModelIndex()):
return len(self.items)
def columnCount(self, parent=QModelIndex()):
return 2
def data(self, index, role):
if not index.isValid(): return QVariant()
elif role != Qt.DisplayRole:
return QVariant()
row=index.row()
column=index.column()
if column==0:
if row<len(self.items):
return QVariant(self.items[row])
elif column==1:
if row<len(self.numbers):
return QVariant( self.numbers[row] )
else:
return QVariant()
def removeRows(self, position, rows=1, index=QModelIndex()):
print "\n\t\t ...removeRows() Starting position: '%s'"%position, 'with the total rows to be deleted: ', rows
self.beginRemoveRows(QModelIndex(), position, position + rows - 1)
self.items = self.items[:position] + self.items[position + rows:]
self.endRemoveRows()
return True
def insertRows(self, position, rows=1, index=QModelIndex()):
print "\n\t\t ...insertRows() Starting position: '%s'"%position, 'with the total rows to be inserted: ', rows
indexSelected=self.index(position, 0)
itemSelected=indexSelected.data().toPyObject()
self.beginInsertRows(QModelIndex(), position, position + rows - 1)
for row in range(rows):
self.items.insert(position + row, "%s_%s"% (itemSelected, self.added))
self.added+=1
self.endInsertRows()
return True
class Proxy(QSortFilterProxyModel):
def __init__(self):
super(Proxy, self).__init__()
def filterAcceptsRow(self, rowProc, parentProc):
modelIndex=self.sourceModel().index(rowProc, 0, parentProc)
item=self.sourceModel().data(modelIndex, Qt.DisplayRole).toPyObject()
if item and 'B' in item:
return True
else: return False
class MyWindow(QWidget):
def __init__(self, *args):
QWidget.__init__(self, *args)
vLayout=QVBoxLayout(self)
self.setLayout(vLayout)
hLayout=QHBoxLayout()
vLayout.insertLayout(0, hLayout)
tableModel=Model(self)
proxyB=Proxy()
proxyB.setSourceModel(tableModel)
self.ViewA=QTableView(self)
self.ViewA.setModel(tableModel)
self.ViewA.clicked.connect(self.viewClicked)
self.ViewB=QTableView(self)
self.ViewB.setModel(proxyB)
self.ViewB.clicked.connect(self.viewClicked)
self.ViewB.setSortingEnabled(True)
self.ViewB.sortByColumn(0, Qt.AscendingOrder)
self.ViewB.setSelectionBehavior(QTableView.SelectRows)
hLayout.addWidget(self.ViewA)
hLayout.addWidget(self.ViewB)
insertButton=QPushButton('Insert Row Above Selection')
insertButton.setObjectName('insertButton')
insertButton.clicked.connect(self.buttonClicked)
removeButton=QPushButton('Remove Selected Item')
removeButton.setObjectName('removeButton')
removeButton.clicked.connect(self.buttonClicked)
vLayout.addWidget(insertButton)
vLayout.addWidget(removeButton)
def getZeroColumnSelectedIndexes(self, tableView=None):
if not tableView: return
selectedIndexes=tableView.selectedIndexes()
if not selectedIndexes: return
return [index for index in selectedIndexes if not index.column()]
def viewClicked(self, indexClicked):
print 'indexClicked() row: %s column: %s'%(indexClicked.row(), indexClicked.column() )
proxy=indexClicked.model()
def buttonClicked(self):
button=self.sender()
if not button: return
tableView=None
if self.ViewA.hasFocus(): tableView=self.ViewA
elif self.ViewB.hasFocus(): tableView=self.ViewB
if not tableView: print 'buttonClicked(): not tableView'; return
zeroColumnSelectedIndexes=self.getZeroColumnSelectedIndexes(tableView)
if not zeroColumnSelectedIndexes: print 'not zeroColumnSelectedIndexes'; return
firstZeroColumnSelectedIndex=zeroColumnSelectedIndexes[0]
if not firstZeroColumnSelectedIndex or not firstZeroColumnSelectedIndex.isValid():
print 'buttonClicked(): not firstZeroColumnSelectedIndex.isValid()'; return
startingRow=firstZeroColumnSelectedIndex.row()
print '\n buttonClicked() startingRow =', startingRow
if button.objectName()=='removeButton':
tableView.model().removeRows(startingRow, len(zeroColumnSelectedIndexes), QModelIndex())
elif button.objectName()=='insertButton':
tableView.model().insertRows(startingRow, len(zeroColumnSelectedIndexes), QModelIndex())
if __name__ == "__main__":
app = QApplication(sys.argv)
w = MyWindow()
w.show()
sys.exit(app.exec_())
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