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<div class="chapter" lang="en">
<div class="titlepage"><div><div><h2 class="title">
<a name="gtk-migrating-GtkIconView"></a>Migrating from GnomeIconList to GtkIconView</h2></div></div></div>
<p>
Since version 2.6, GTK+ provides the <a href="GtkIconView.html" title="GtkIconView"><span class="type">GtkIconView</span></a> widget. It is similar in
functionality to the <span class="structname">GnomeIconList</span> widget in the
libgnomeui library, both widgets provide a way to lay out named icons in
a grid. The distinctive feature of the GTK+ widget is that it follows the
model-view pattern, allowing it to share the actual data (i.e. the names
and images of the icons) with other views.
</p>
<p>
<a href="GtkIconView.html" title="GtkIconView"><span class="type">GtkIconView</span></a> currently doesn't support some features found in
<span class="structname">GnomeIconList</span>. Icons can not be positioned freely,
the spacing is not customizable, and it is not possible to edit the names of
icons.
</p>
<p>
To convert an application that uses <span class="structname">GnomeIconList</span>
to <a href="GtkIconView.html" title="GtkIconView"><span class="type">GtkIconView</span></a>, the first step is to organize your data in a <a href="GtkTreeModel.html" title="GtkTreeModel"><span class="type">GtkTreeModel</span></a>.
<span class="structname">GnomeIconList</span> lets you directly insert data with
<code class="function">gnome_icon_list_insert()</code> and <code class="function">gnome_icon_list_insert_pixbuf()</code> and their
append variants. So, if you previously had a function to fill your icon
list similar to this one:
</p>
<div class="informalexample"><pre class="programlisting">
void
fill_icon_list (GnomeIconList *icon_list)
{
gnome_icon_list_append (icon_list, "file1.png", "Icon 1");
gnome_icon_list_append (icon_list, "file2.png", "Icon 2");
/* more icons ... */
}
</pre></div>
<p>
you will have to create a tree model, attach your icon view to it, and
fill the model:
</p>
<div class="informalexample"><pre class="programlisting">
enum {
PIXBUF_COLUMN,
TEXT_COLUMN,
/* you can have more columns here, e.g */
DATA_COLUMN
};
void
fill_model (GtkListStore *store)
{
GtkTreeIter iter;
GdkPixbuf *pixbuf;
gtk_list_store_append (store, &iter);
pixbuf = gdk_pixbuf_new_from_file ("file1.png", NULL);
gtk_list_store_set (store, &iter, PIXBUF_COLUMN, pixbuf, TEXT_COLUMN, "Icon 1", -1);
g_object_unref (pixbuf);
gtk_list_store_append (store, &iter);
pixbuf = gdk_pixbuf_new_from_file ("file2.png", NULL);
gtk_list_store_set (store, &iter, PIXBUF_COLUMN, pixbuf, TEXT_COLUMN, "Icon 2", -1);
g_object_unref (pixbuf);
/* more icons ... */
}
int
main (int argc, char *argv[])
{
GtkWidget *icon_view;
GtkListStore *store;
gtk_init (&argc, &argv);
/* do other initialization... */
/* construct the GtkIconView */
icon_view = gtk_icon_view_new ();
store = gtk_list_store_new (3, GDK_TYPE_PIXBUF, G_TYPE_STRING, G_TYPE_POINTER);
gtk_icon_view_set_pixbuf_column (GTK_ICON_VIEW (icon_view), PIXBUF_COLUMN);
gtk_icon_view_set_text_column (GTK_ICON_VIEW (icon_view), TEXT_COLUMN);
gtk_icon_view_set_model (GTK_ICON_VIEW (icon_view), GTK_TREE_MODEL (store));
fill_model (store);
/* ... */
}
</pre></div>
<p>
This example uses a <a href="GtkListStore.html" title="GtkListStore"><span class="type">GtkListStore</span></a> as model, but part of the elegance of the
model-view pattern is that you can easily use another tree model implementation,
or even write your own custom tree model.
</p>
<p>
Your application may make use of extra data attached to the icons in the
<span class="structname">GnomeIconList</span> via <code class="function">gnome_icon_list_set_icon_data()</code> and
<code class="function">gnome_icon_list_get_icon_data()</code>. With <a href="GtkIconView.html" title="GtkIconView"><span class="type">GtkIconView</span></a> such data is most
conveniently stored in an extra column in the tree model, so you would
call a function like
</p>
<div class="informalexample"><pre class="programlisting">
void
set_icon_data (GtkIconView *icon_view,
gint idx,
gpointer data)
{
GtkTreeModel *model;
GtkTreeIter iter;
model = gtk_icon_view_get_model (icon_view);
if (gtk_tree_model_iter_nth_child (model, &iter, NULL, idx))
gtk_list_store_set (GTK_LIST_STORE (model), &iter,
DATA_COLUMN, data, -1);
}
</pre></div>
<p>
assuming that your tree model has a <code class="literal">DATA_COLUMN</code> of type
<a
href="../gobject/gobject-Type-Information.html#G-TYPE-POINTER:CAPS"
><code class="literal">G_TYPE_POINTER</code></a>.
</p>
<p>
There is a number of minor API differences between
<span class="structname">GnomeIconList</span> and
<span class="structname">GtkIconView</span>:
</p>
<div class="itemizedlist"><ul type="disc">
<li><p>
<font color="red"><typename>GnomeIconListMode</typename></font> is replaced by the
<a href="GtkIconView.html#GtkIconView--orientation">orientation</a>
property of <span class="structname">GtkIconView</span>
</p></li>
<li><p>
<span class="structname">GtkIconView</span> can not be frozen in the same
way as <span class="structname">GnomeIconList</span> can with
<code class="function">gnome_icon_list_freeze()</code> and <code class="function">gnome_icon_list_thaw()</code>. Instead you can
replace the whole model of a <span class="structname">GtkIconView</span>,
instead of doing many small changes to the existing model.
</p></li>
</ul></div>
<p>
</p>
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