Hello,
I am trying to create a simple model and view for a simple nested dictionary
like d:
c1 = {'id':1, 'description':'child 1'}
c2 = {'id':2, 'description':'child 2'}
d = {'id':0, 'description':'whatever', 'children':[c1, c2]}
I have a self-contained, relatively simple script attached. When I run it
and try to open the top-level entry by clicking on the +, I get errors like:
Traceback (most recent call last):
File "tree_test.py", line 111, in parent
parent = index.internalPointer().parent
AttributeError: 'ItemDataRole' object has no attribute 'parent'
Traceback (most recent call last):
File "tree_test.py", line 111, in parent
parent = index.internalPointer().parent
AttributeError: parent
Traceback (most recent call last):
File "tree_test.py", line 111, in parent
parent = index.internalPointer().parent
AttributeError: 'exceptions.AttributeError' object has no attribute 'parent'
Bus error
sometimes I get a different error:
Traceback (most recent call last):
File "tree_test.py", line 111, in parent
parent = index.internalPointer().parent
AttributeError: 'ItemDataRole' object has no attribute 'parent'
Segmentation fault
Could anyone please help me understand what is happening? I dont understand
why index.internalPointer() is returning an ItemDataRole object or an
exceptions.AttributeError object.
Im running Qt-4.5.0, sip-4.7.9 and PyQt-4.4.4.
Thank you,
Darren
"""
"""
from PyQt4 import QtCore, QtGui
class TreeItem:
def __init__(self, data, parent=None):
self._parent = parent
self._data = data
@property
def children(self):
return []
@property
def columns(self):
return [self.data['id'], self.data['description']]
@property
def parent(self):
return self._parent
@property
def data(self):
return self._data
@property
def row(self):
if self.parent:
return self.parent.children.index(self)
return 0
def __len__(self):
return len(self.columns)
class RootItem(TreeItem):
def __init__(self):
self._parent = None
self._children = []
@property
def children(self):
return self._children
@property
def columns(self):
return ['ID', 'Description']
def appendChild(self, child):
self._children.append(child)
class DictItem(TreeItem):
@property
def children(self):
return [TreeItem(child, self) for child in self.data['children']]
class FileModel(QtCore.QAbstractItemModel):
"""
"""
def __init__(self, parent=None):
super(FileModel, self).__init__(parent)
self._rootItem = RootItem()
@property
def rootItem(self):
return self._rootItem
def columnCount(self, parent):
if parent.isValid():
return len(parent.internalPointer().columns)
else:
return len(self.rootItem.columns)
def data(self, index, role):
if not index.isValid() or role != QtCore.Qt.DisplayRole:
return QtCore.QVariant()
item = index.internalPointer()
return QtCore.QVariant(item.columns[index.column()])
def headerData(self, section, orientation, role):
if orientation == QtCore.Qt.Horizontal and \
role == QtCore.Qt.DisplayRole:
return QtCore.QVariant(self.rootItem.columns[section])
return QtCore.QVariant()
def index(self, row, column, parent):
if not self.hasIndex(row, column, parent):
return QtCore.QModelIndex()
if parent.isValid():
parentItem = parent.internalPointer()
else:
parentItem = self.rootItem
child = parentItem.children[row]
return self.createIndex(row, column, child)
def parent(self, index):
if not index.isValid():
return QtCore.QModelIndex()
parent = index.internalPointer().parent
if parent == self.rootItem or parent is None:
return QtCore.QModelIndex()
return self.createIndex(parent.row, 0, parent)
def rowCount(self, parent):
if parent.isValid():
parentItem = parent.internalPointer()
else:
parentItem = self.rootItem
return len(parentItem.children)
def appendDict(self, d):
assert 'id' in d
assert 'description' in d
self.rootItem.appendChild(DictItem(d))
class FileView(QtGui.QTreeView):
def __init__(self, model=None, parent=None):
super(FileView, self).__init__(parent)
self.setModel(model)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
model = FileModel()
form = FileView(model)
c1 = {'id':1, 'description':'child 1'}
c2 = {'id':2, 'description':'child 2'}
d = {'id':0, 'description':'whatever', 'children':[c1, c2]}
model.appendDict(d)
form.show()
sys.exit(app.exec_())
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