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Add a first version of a GnomeIconList --> GtkIconView migration chapter.

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2004-11-03  Matthias Clasen  <mclasen@redhat.com>

	* gtk/migrating-GtkIconView.sgml: Add a first version of
	a GnomeIconList --> GtkIconView migration chapter.
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Matthias Clasen 2004-11-04 03:34:51 +00:00 committed by Matthias Clasen
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5
docs/reference/ChangeLog
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@ -1,3 +1,8 @@
2004-11-03 Matthias Clasen <mclasen@redhat.com>
* gtk/migrating-GtkIconView.sgml: Add a first version of
a GnomeIconList --> GtkIconView migration chapter.
2004-11-02 Matthias Clasen <mclasen@redhat.com>
* gtk/tmpl/gtkcellrenderercombo.sgml:

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docs/reference/gtk/gtk-docs.sgml
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@ -191,6 +191,7 @@
<!ENTITY gtk-migrating-GtkFileChooser SYSTEM "migrating-GtkFileChooser.sgml">
<!ENTITY gtk-migrating-GtkAction SYSTEM "migrating-GtkAction.sgml">
<!ENTITY gtk-migrating-GtkComboBox SYSTEM "migrating-GtkComboBox.sgml">
<!ENTITY gtk-migrating-GtkIconView SYSTEM "migrating-GtkIconView.sgml">
<!ENTITY version SYSTEM "version.xml">
<!ENTITY gtk-query-immodules SYSTEM "gtk-query-immodules-2.0.xml">
<!ENTITY gtk-update-icon-cache SYSTEM "gtk-update-icon-cache.xml">
@ -571,6 +572,7 @@ that is, GUI components such as <link linkend="GtkButton">GtkButton</link> or
&gtk-migrating-GtkFileChooser;
&gtk-migrating-GtkAction;
&gtk-migrating-GtkComboBox;
&gtk-migrating-GtkIconView;
</part>
<part>

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docs/reference/gtk/migrating-GtkIconView.sgml Normal file
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<chapter id="gtk-migrating-GtkIconView">
<title>Migrating from GnomeIconList to GtkIconView</title>
<para>
Since version 2.6, GTK+ provides the <link linkend="GtkIconView">GtkIconView</link>
widget. It is similar in functionality to the GnomeIconList 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.
</para>
<para>
<link linkend="GtkIconView">GtkIconView</link> currently doesn't support some features
found in GnomeIconList. Icons can not be positioned freely, the spacing is not customizable,
and it is not possible to edit the names of icons.
</para>
<para>
To convert an application that uses GnomeIconList to
<link linkend="GtkIconView">GtkIconView</link>, the first step is to organize your data
in a <link linkend="GtkTreeModel">GtkTreeModel</link>. GnomeIconList lets you directly
insert data with gnome_icon_list_insert() and gnome_icon_list_insert_pixbuf() and their
append variants. So, if you previously had a function to fill your icon list similar
to this one:
<informalexample><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 ... */
}
</programlisting></informalexample>
you will have to create a tree model, attach your icon view to it, and fill the model:
<informalexample><programlisting>
enum {
PIXBUF_COLUMN,
TEXT_COLUMN,
/* you can have more columns here, e.g */
DATA_COLUMN
};
void
fill_model (GtkListStore *model)
{
GtkTreeIter iter;
GdkPixbuf *pixbuf;
gtk_list_store_append (model, &amp;iter);
pixbuf = gdk_pixbuf_new_from_file ("file1.png", NULL);
gtk_list_store_set (model, &amp;iter, PIXBUF_COLUMN, pixbuf, TEXT_COLUMN, "Icon 1", -1);
g_object_unref (pixbuf);
gtk_list_store_append (model, &amp;iter);
pixbuf = gdk_pixbuf_new_from_file ("file2.png", NULL);
gnome_icon_list_append (icon_list, PIXBUF_COLUMN, pixbuf, TEXT_COLUMN, "Icon 2", -1);
g_object_unref (pixbuf);
/* more icons ... */
}
int
main (int argc, char *argv[])
{
GtkWidget *icon_view;
GtkTreeModel *model;
gtk_init (&amp;argc, &amp;argv);
/* do other initialization... */
/* construct the GtkIconView */
icon_view = gtk_icon_view_new ();
model = 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), model);
fill_model (model);
/* ... */
}
</programlisting></informalexample>
This example uses a <link linkend="GtkListStore">GtkListStore</link> 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.
</para>
<para>
Your application may make use of extra data attached to the icons in the
GnomeIconList via gnome_icon_list_set_icon_data() and gnome_icon_list_get_icon_data().
With <link linkend="GtkIconView">GtkIconView</link> such data is most conveniently
stored in an extra column in the tree model, so you would call a function like
<informalexample><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, &amp;iter, NULL, idx))
gtk_list_store_set (GTK_LIST_STORE (model), &amp;iter,
DATA_COLUMN, data, -1);
}
</programlisting></informalexample>
assuming that your tree model has a DATA_COLUMN of type G_TYPE_POINTER.
</para>
<para>
There is a number of minor API differences between GnomeIconList and GtkIconView:
<itemizedlist>
<listitem><para>
GnomeIconListMode is replaced by the orientation property of GtkIconView
</para></listitem>
<listitem><para>
GtkIconView can not be frozen in the same was as GnomeIconList with
gnome_icon_list_freeze() and gnome_icon_list_thaw(). Instead you can
replace the whole model of a GtkIconView, instead of doing many small
changes to the existing model.
</para></listitem>
</itemizedlist>
</para>
</chapter>
<!--
Local variables:
mode: sgml
sgml-parent-document: ("gtk-docs.sgml" "book" "part" "chapter")
End:
-->