[PyQt] table view/model/delegate issue

[Hans-Peter Jansen]

On Wednesday 09 March 2011, 20:15:13 Kerri Reno wrote:
> Hello!
>
> I hope someone can help me with this.  I have a QTableView with 3
> columns, the 3rd column is editable, and the first two are not.  My
> problem is when I double click on the 3rd column, any existing text
> is cleared.  I want to be able to edit the existing text.  I'm using
> a QItemDelegate, and putting the text into a QTextEdit editor.  I
> can't see what I'm doing wrong.  Please take a look at my stripped
> down example, below.  I've highlighted the code that I think should
> put the text in the editor.  What am I doing wrong?
>
> I'm using PyQt 4.7.2 and Python 2.6.5.
>
> Thanks in Advance for any help you can give me!
> Kerri
>
> --
> from PyQt4.QtGui import *
> from PyQt4.QtCore import *
> import sys
> import datetime
>
> class notesView(QTableView):
>
>         def __init__(self,parent,data):
>
>                 QTableView.__init__(self,parent)
>                 self.setSizePolicy(QSizePolicy.MinimumExpanding,
>                         QSizePolicy.MinimumExpanding)
>
>                 model = notesModel(data)
>                 self.setModel(model)
>                 self.setItemDelegate(notesDelegate(self))
>                 self.setFixedWidth(400)
>                 self.show()
>
> class notesModel(QAbstractTableModel):
>
>         def __init__(self,data):
>                 QAbstractTableModel.__init__(self)
>                 self.notes = data
>
>         def flags(self,index):
>                 if not index.isValid():
>                         return Qt.ItemIsEnabled
>                 column = index.column()
>                 if column == 2:
>                         return
> Qt.ItemFlags(QAbstractTableModel.flags(self,index)|
>                                         Qt.ItemIsEditable)
>                 return
> Qt.ItemFlags(QAbstractTableModel.flags(self,index))
>
>         def rowCount(self, index=QModelIndex()):
>                 return len(self.notes)
>
>         def columnCount(self,index=QModelIndex()):
>                 return 3
>
>         def data(self,index,role=Qt.DisplayRole):
>                 if not index.isValid() or not (0 <= index.row() <
> len(self.notes)):
>                         return QVariant()
>
>                 note = self.notes[index.row()]
>                 column = index.column()
>
>                 if role == Qt.DisplayRole:
>                         if column ==  0:
>                                 return
> QVariant(QDate(note['stamp']).toString('MM/dd/yyyy'))
>                         elif column == 1:
>                                 return
> QVariant(QString("%1").arg(note['print_name']))
>                         elif column == 2:
>                                 if note['note']:
>                                         return
> QVariant(QString("%1").arg(note['note']))
>                                 else:
>                                         return QVariant('')
>                 elif role == Qt.TextAlignmentRole:
>                         return
> QVariant(int(Qt.AlignLeft|Qt.AlignTop))
>
>                 return QVariant()
>
>         def setData(self, index, value, role=Qt.EditRole):
>                 if index.isValid() and 0 <= index.row() <
> len(self.notes): note = self.notes[index.row()]
>                         column = index.column()
>                         if column == 2:
>                                 note['note'] =
> str(value.toString().trimmed())
>                                 note['stamp'] =
> datetime.datetime.now() return True
>                 return False
>
> class notesDelegate(QItemDelegate):
>
>         def createEditor(self,parent,option,index):
>                 if index.column() == 2:
>                         text = index.model().data(index).toString()
>                         editor = QTextEdit(parent)
>                         editor.setPlainText(text)
>                         return editor
>                 else:
>                         return
> QItemDelegate.createEditor(self,parent,option,index)
>
>         def setModelData(self, editor, model, index):
>                 if index.column() == 2:
>                        
> model.setData(index,QVariant(editor.toPlainText())) else:
>                         QItemDelegate.setModelData(self, editor,
> model, index())
>
> if __name__ == '__main__':
>
>         app = QApplication(sys.argv)
>         data = [{'note' : 'testing',
>                 'print_name' : 'John Anderson',
>                 'stamp' : datetime.datetime(2011,3,9,11,26,16)}]
>         dlg = notesView(None,data = data)
>         app.exec_()

It looks, like you missed to reimplement setEditorData in your item 
delegate.

Hth,
Pete