The tree interface used by GtkTreeView
The `GtkTreeModel` interface defines a generic tree interface for use by the `GtkTreeView` widget. It is an abstract interface, and is designed to be usable with any appropriate data structure. The programmer just has to implement this interface on their own data type for it to be viewable by a `GtkTreeView` widget.
The model is represented as a hierarchical tree of strongly-typed, columned data. In other words, the model can be seen as a tree where every node has different values depending on which column is being queried. The type of data found in a column is determined by using the GType system (ie. g_type_int, gtk_type_button, g_type_pointer, etc). The types are homogeneous per column across all nodes. It is important to note that this interface only provides a way of examining a model and observing changes. The implementation of each individual model decides how and if changes are made.
In order to make life simpler for programmers who do not need to write their own specialized model, two generic models are provided — the `GtkTreeStore` and the `GtkListStore`. To use these, the developer simply pushes data into these models as necessary. These models provide the data structure as well as all appropriate tree interfaces. As a result, implementing drag and drop, sorting, and storing data is trivial. For the vast majority of trees and lists, these two models are sufficient.
Models are accessed on a node/column level of granularity. One can query for the value of a model at a certain node and a certain column on that node. There are two structures used to reference a particular node in a model. They are the [[email protected]] and the [ [email protected]] (“iter” is short for iterator). Most of the interface consists of operations on a [[email protected]].
A path is essentially a potential node. It is a location on a model that may or may not actually correspond to a node on a specific model. A [[email protected]] can be converted into either an array of unsigned integers or a string. The string form is a list of numbers separated by a colon. Each number refers to the offset at that level. Thus, the path `0` refers to the root node and the path `2:4` refers to the fifth child of the third node.
By contrast, a [[email protected]] is a reference to a specific node on a specific model. It is a generic struct with an integer and three generic pointers. These are filled in by the model in a model-specific way. One can convert a path to an iterator by calling get_iter. These iterators are the primary way of accessing a model and are similar to the iterators used by `GtkTextBuffer`. They are generally statically allocated on the stack and only used for a short time. The model interface defines a set of operations using them for navigating the model.
It is expected that models fill in the iterator with private data. For example, the `GtkListStore` model, which is internally a simple linked list, stores a list node in one of the pointers. The `GtkTreeModel`Sort stores an array and an offset in two of the pointers. Additionally, there is an integer field. This field is generally filled with a unique stamp per model. This stamp is for catching errors resulting from using invalid iterators with a model.
The lifecycle of an iterator can be a little confusing at first. Iterators are expected to always be valid for as long as the model is unchanged (and doesn’t emit a signal). The model is considered to own all outstanding iterators and nothing needs to be done to free them from the user’s point of view. Additionally, some models guarantee that an iterator is valid for as long as the node it refers to is valid (most notably the `GtkTreeStore` and `GtkListStore`). Although generally uninteresting, as one always has to allow for the case where iterators do not persist beyond a signal, some very important performance enhancements were made in the sort model. As a result, the gtk_tree_model_iters_persist flag was added to indicate this behavior.
To help show some common operation of a model, some examples are provided. The first example shows three ways of getting the iter at the location `3:2:5`. While the first method shown is easier, the second is much more common, as you often get paths from callbacks.
```c // Three ways of getting the iter pointing to the location GtkTreePath *path; GtkTreeIter iter; GtkTreeIter parent_iter;
// get the iterator from a string gtk_tree_model_get_iter_from_string (model, &iter, "3:2:5");
// get the iterator from a path path = gtk_tree_path_new_from_string ("3:2:5"); gtk_tree_model_get_iter (model, &iter, path); gtk_tree_path_free (path);
// walk the tree to find the iterator gtk_tree_model_iter_nth_child (model, &iter, NULL, 3); parent_iter = iter; gtk_tree_model_iter_nth_child (model, &iter, &parent_iter, 2); parent_iter = iter; gtk_tree_model_iter_nth_child (model, & iter, &parent_iter, 5); ```
This second example shows a quick way of iterating through a list and getting a string and an integer from each row. The
populate_model function used below is not shown, as it is specific to the `GtkListStore`. For information on how to write such a
function, see the `GtkListStore` documentation.
```c enum { STRING_COLUMN, INT_COLUMN, N_COLUMNS };
...
GtkTreeModel *list_store; GtkTreeIter iter; gboolean valid; int row_count = 0;
// make a new list_store list_store = gtk_list_store_new (N_COLUMNS, G_TYPE_STRING, G_TYPE_INT);
// Fill the list store with data populate_model (list_store);
// Get the first iter in the list, check it is valid and walk // through the list, reading each row.
valid = gtk_tree_model_get_iter_first (list_store, &iter); while (valid) { char *str_data; int int_data;
// Make sure you terminate calls to @get with a “-1” value gtk_tree_model_get ( list_store, &iter, STRING_COLUMN, &str_data, INT_COLUMN, &int_data, -1);
// Do something with the data g_print ("Row d: (s, d)\n", row_count, str_data, int_data); g_free (str_data);
valid = gtk_tree_model_iter_next (list_store, &iter); row_count++; } ```
The `GtkTreeModel` interface contains two methods for reference counting: ref_node and unref_node. These two methods are optional to implement. The reference counting is meant as a way for views to let models know when nodes are being displayed. `GtkTreeView` will take a reference on a node when it is visible, which means the node is either in the toplevel or expanded. Being displayed does not mean that the node is currently directly visible to the user in the viewport. Based on this reference counting scheme a caching model, for example, can decide whether or not to cache a node based on the reference count. A file-system based model would not want to keep the entire file hierarchy in memory, but just the folders that are currently expanded in every current view.
When working with reference counting, the following rules must be taken into account: