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67 lines
1.8 KiB
Python
67 lines
1.8 KiB
Python
#!/usr/bin/env python
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# Unit Name: tree_model
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# Created By: Virgil Dupras
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# Created On: 2009-05-04
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# $Id$
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# Copyright 2009 Hardcoded Software (http://www.hardcoded.net)
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from PyQt4.QtCore import Qt, QAbstractItemModel, QVariant, QModelIndex
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class TreeNode(object):
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def __init__(self, parent, row):
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self.parent = parent
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self.row = row
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self._children = None
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def _get_children(self):
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raise NotImplementedError()
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@property
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def children(self):
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if self._children is None:
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self._children = self._get_children()
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return self._children
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class TreeModel(QAbstractItemModel):
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def __init__(self):
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QAbstractItemModel.__init__(self)
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self._nodes = None
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def _root_nodes(self):
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raise NotImplementedError()
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def index(self, row, column, parent):
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if not self.nodes:
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return QModelIndex()
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if not parent.isValid():
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return self.createIndex(row, column, self.nodes[row])
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node = parent.internalPointer()
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return self.createIndex(row, column, node.children[row])
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def parent(self, index):
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if not index.isValid():
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return QModelIndex()
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node = index.internalPointer()
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if node.parent is None:
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return QModelIndex()
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else:
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return self.createIndex(node.parent.row, 0, node.parent)
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def reset(self):
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self._nodes = None
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QAbstractItemModel.reset(self)
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def rowCount(self, parent):
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if not parent.isValid():
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return len(self.nodes)
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node = parent.internalPointer()
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return len(node.children)
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@property
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def nodes(self):
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if self._nodes is None:
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self._nodes = self._root_nodes()
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return self._nodes
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