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The GenericTreeModel eases implementing the Gtk.TreeModel interface in Python. The class can be subclassed to provide a TreeModel implementation which works directly with Python objects instead of iterators. All of the on_* methods should be overridden by subclasses to provide the underlying implementation a way to access custom model data. For the purposes of this API, all custom model data supplied or handed back through the overridable API will use the argument names: node, parent, and child in regards to user data python objects. The create_tree_iter, set_user_data, invalidate_iters, iter_is_valid methods are available to help manage Gtk.TreeIter objects and their Python object references. GenericTreeModel manages a pool of user data nodes that have been used with iters. This pool stores a references to user data nodes as a dictionary value with the key being the integer id of the data. This id is what the Gtk.TreeIter objects use to reference data in the pool. References will be removed from the pool when the model is deleted or explicitly by using the optional "node" argument to the "row_deleted" method when notifying the model of row deletion. Tz�If True, strong references to user data attached to iters are stored in a dictionary pool (default). Otherwise the user data is stored as a raw pointer to a python object without a reference.)ZdefaultZtypeZblurbc s( t t| ��� d| _t� | _| �� dS )zFInitialize. Make sure to call this from derived classes if overridden.r N)�superr �__init__r Zdict� _held_refs�invalidate_iters��self�Z __class__r r r l s zGenericTreeModel.__init__c # s^ t �dg�}|rZ|�� � � dur,��� �V � �fdd�t��� ��D �}|�t|�� q dS )zHDepth-first iteration of the entire TreeModel yielding the python nodes.Nc s g | ]}�� � |��qS r )Ziter_nth_child)Z.0Zi��itr r r Z <listcomp>~ s z5GenericTreeModel.iter_depth_first.<locals>.<listcomp>)� collectionsZdequeZpopleft� get_user_dataZrangeZiter_n_childrenZ extendleftZreversed)r ZstackZchildrenr r! r �iter_depth_firstw s z!GenericTreeModel.iter_depth_firstc C s, d|_ |jr(|j| jv r"| j|j= d|_dS )z?Clear user data and its reference from the iter and this model.r N)r r r �r r r r r �invalidate_iter� s z GenericTreeModel.invalidate_iterc C s t �dd�| _| j�� dS )z� This method invalidates all TreeIter objects associated with this custom tree model and frees their locally pooled references. i �i���N)�randomZrandintr r Zclearr r r r r � s z!GenericTreeModel.invalidate_itersc C s |j | j kS )zv :Returns: True if the gtk.TreeIter specified by iter is valid for the custom tree model. )r r& r r r � iter_is_valid� s z GenericTreeModel.iter_is_validc C s | j r| j|j S t|�S dS )z�Get the user_data associated with the given TreeIter. GenericTreeModel stores arbitrary Python objects mapped to instances of Gtk.TreeIter. This method allows to retrieve the Python object held by the given iterator. N)�leak_referencesr r r r& r r r r$ � s z GenericTreeModel.get_user_datac C s< t |�|_|du r | �|� n| j|_| jr8|| j|j< dS )z�Applies user_data and stamp to the given iter. If the models "leak_references" property is set, a reference to the user_data is stored with the model to ensure we don't run into bad memory problems with the TreeIter. N)r r r' r r* r )r r r r r r � set_user_data� s z GenericTreeModel.set_user_datac C s t �� }| �||� |S )a Create a Gtk.TreeIter instance with the given user_data specific for this model. Use this method to create Gtk.TreeIter instance instead of directly calling Gtk.Treeiter(), this will ensure proper reference managment of wrapped used_data. )r ZTreeIterr+ )r r r r r r �create_tree_iter� s z!GenericTreeModel.create_tree_iterc C s" |du r dS | � |�}d|fS dS )zyInternal creation of a (bool, TreeIter) pair for returning directly back to the view interfacing with this model.N�FNT)r, )r �datar" r r r �_create_tree_iter� s z"GenericTreeModel._create_tree_iterNc s. t t| ��|� t|�}|| jv r*| j|= dS )a� Notify the model a row has been deleted. Use the node parameter to ensure the user_data reference associated with the path is properly freed by this model. :Parameters: path : Gtk.TreePath Path to the row that has been deleted. node : object Python object used as the node returned from "on_get_iter". This is optional but ensures the model will not leak references to this object. N)r r � row_deletedr r )r �path�nodeZnode_idr r r r0 � s z GenericTreeModel.row_deletedr c C s | � � S ��Internal method.)� on_get_flagsr r r r � do_get_flags� s z GenericTreeModel.do_get_flagsc C s | � � S r3 )�on_get_n_columnsr r r r �do_get_n_columns� s z!GenericTreeModel.do_get_n_columnsc C s | � |�S r3 )�on_get_column_type�r Zindexr r r �do_get_column_type� s z#GenericTreeModel.do_get_column_typer- c C s | � | �|��S r3 )r/ � on_get_iter�r r1 r r r � do_get_iter� s z GenericTreeModel.do_get_iterFc C s8 |du r| � d�}n| � | �|��}| �||� |duS �r4 N)� on_iter_nextr$ r+ )r r Z next_datar r r � do_iter_next� s z GenericTreeModel.do_iter_nextc C s* | � | �|��}|du r dS t�|�S dS r? )� on_get_pathr$ r ZTreePath)r r r1 r r r � do_get_path� s z GenericTreeModel.do_get_pathc C s | � | �|�|�S r3 )� on_get_valuer$ )r r �columnr r r � do_get_value s z GenericTreeModel.do_get_valuec C s" |r| � |�nd}| �| �|��S r? )r$ r/ �on_iter_children)r �parentr. r r r �do_iter_children s z!GenericTreeModel.do_iter_childrenc C s | � | �|��S r3 )�on_iter_has_childr$ �r rH r r r �do_iter_has_child s z"GenericTreeModel.do_iter_has_childc C s" |du r| � d�S | � | �|��S r? )�on_iter_n_childrenr$ r& r r r �do_iter_n_children s z#GenericTreeModel.do_iter_n_childrenc C s2 |du r| � d|�}n| � | �|�|�}| �|�S r? )�on_iter_nth_childr$ r/ )r rH �nr. r r r �do_iter_nth_child s z"GenericTreeModel.do_iter_nth_childc C s | � | �| �|���S r3 )r/ �on_iter_parentr$ �r Zchildr r r �do_iter_parent# s z GenericTreeModel.do_iter_parentc C s | � | �|�� d S r )� on_ref_noder$ r& r r r � do_ref_node( s z GenericTreeModel.do_ref_nodec C s | � | �|�� d S r )� on_unref_noder$ r& r r r � do_unref_node, s z GenericTreeModel.do_unref_nodec C s t �dS )zyOverridable. :Returns Gtk.TreeModelFlags: The flags for this model. See: Gtk.TreeModelFlags Nr r r r r r5 3 s z GenericTreeModel.on_get_flagsc C s t �dS )zZOverridable. :Returns: The number of columns for this model. Nr r r r r r7 ; s z!GenericTreeModel.on_get_n_columnsc C s t �dS )zYOverridable. :Returns: The column type for the given index. Nr r: r r r r9 C s z#GenericTreeModel.on_get_column_typec C s t �dS )zcOverridable. :Returns: A python object (node) for the given TreePath. Nr r= r r r r< K s z GenericTreeModel.on_get_iterc C s t �dS )z�Overridable. :Parameters: node : object Node at current level. :Returns: A python object (node) following the given node at the current level. Nr �r r2 r r r r@ S s z GenericTreeModel.on_iter_nextc C s t �dS )zSOverridable. :Returns: A TreePath for the given node. Nr rY r r r rB _ s z GenericTreeModel.on_get_pathc C s t �dS )z�Overridable. :Parameters: node : object column : int Column index to get the value from. :Returns: The value of the column for the given node.Nr )r r2 rE r r r rD g s z GenericTreeModel.on_get_valuec C s t �dS )z�Overridable. :Returns: The first child of parent or None if parent has no children. If parent is None, return the first node of the model. Nr rK r r r rG s s z!GenericTreeModel.on_iter_childrenc C s t �dS )zYOverridable. :Returns: True if the given node has children. Nr rY r r r rJ | s z"GenericTreeModel.on_iter_has_childc C s t �dS )z�Overridable. :Returns: The number of children for the given node. If node is None, return the number of top level nodes. Nr rY r r r rM � s z#GenericTreeModel.on_iter_n_childrenc C s t �dS )ah Overridable. :Parameters: parent : object n : int Index of child within parent. :Returns: The child for the given parent index starting at 0. If parent None, return the top level node corresponding to "n". If "n" is larger then available nodes, return None. Nr )r rH rP r r r rO � s z"GenericTreeModel.on_iter_nth_childc C s t �dS )zjOverridable. :Returns: The parent node of child or None if child is a top level node.Nr rS r r r rR � s z GenericTreeModel.on_iter_parentc C s d S r r rY r r r rU � s z GenericTreeModel.on_ref_nodec C s d S r r rY r r r rW � s z GenericTreeModel.on_unref_node)N)1r r r Z__doc__r ZPropertyZboolr* r r% r' r r) r$ r+ r, r/ r0 r r6 r8 Z TYPE_INVALIDr; r> rA rC rF rI rL rN rQ rT rV rX r5 r7 r9 r< r@ rB rD rG rJ rM rO rR rU rW Z __classcell__r r r r r K sp � r )r r( r# r ZplatformZ gi.repositoryr r Z Structurer Zpython_implementationr r Z TreeModelr r r r r Z<module> s
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