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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="combobox.vala" xml:lang="es">
<info>
<title type="text">ComboBox (Vala)</title>
<link type="guide" xref="beginner.vala#menu-combo-toolbar"/>
<revision version="0.1" date="2012-05-07" status="draft"/>
<credit type="author copyright">
<name>Tiffany Antopolski</name>
<email its:translate="no">tiffany.antopolski@gmail.com</email>
<years>2012</years>
</credit>
<desc>Un widget usado para elegir de una lista de elementos</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Daniel Mustieles</mal:name>
<mal:email>daniel.mustieles@gmail.com</mal:email>
<mal:years>2011 - 2017</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Nicolás Satragno</mal:name>
<mal:email>nsatragno@gmail.com</mal:email>
<mal:years>2012 - 2013</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Jorge González</mal:name>
<mal:email>jorgegonz@svn.gnome.org</mal:email>
<mal:years>2011</mal:years>
</mal:credit>
</info>
<title>ComboBox</title>
<media type="image" mime="image/png" src="media/combobox.png"/>
<p>Este ComboBox imprime en la terminal cuando cambia su selección.</p>
<code mime="text/x-csharp" style="numbered">/* A window in the application */
class MyWindow : Gtk.ApplicationWindow {
/* An instance array of linux distributions belonging to this window. */
string[] distros = {"Select distribution", "Fedora", "Mint", "Suse"};
/* This enum makes the code more readable when we refer to
* the column as Column.DISTRO, instead of just 0.
*/
enum Column {
DISTRO
}
/* Constructor */
internal MyWindow (MyApplication app) {
Object (application: app, title: "Welcome to GNOME");
this.set_default_size (200, -1);
this.border_width = 10;
Gtk.ListStore liststore = new Gtk.ListStore (1, typeof (string));
for (int i = 0; i < distros.length; i++){
Gtk.TreeIter iter;
liststore.append (out iter);
liststore.set (iter, Column.DISTRO, distros[i]);
}
Gtk.ComboBox combobox = new Gtk.ComboBox.with_model (liststore);
Gtk.CellRendererText cell = new Gtk.CellRendererText ();
combobox.pack_start (cell, false);
combobox.set_attributes (cell, "text", Column.DISTRO);
/* Set the first item in the list to be selected (active). */
combobox.set_active (0);
/* Connect the 'changed' signal of the combobox
* to the signal handler (aka. callback function).
*/
combobox.changed.connect (this.item_changed);
/* Add the combobox to this window */
this.add (combobox);
combobox.show ();
}
/* Signal handler for the 'changed' signal of the combobox. */
void item_changed (Gtk.ComboBox combo) {
if (combo.get_active () !=0) {
print ("You chose " + distros [combo.get_active ()] +"\n");
}
}
}
/* This is the application */
class MyApplication : Gtk.Application {
/* Constructor */
internal MyApplication () {
Object (application_id: "org.example.MyApplication");
}
/* Override the activate signal of GLib.Application,
* which is inherited by Gtk.Application.
*/
protected override void activate () {
/* Create the window of this application
* and show it.
*/
new MyWindow (this).show ();
}
}
/* main creates and runs the application */
int main (string[] args) {
return new MyApplication ().run (args);
}
</code>
<p>En este ejemplo se usa lo siguiente:</p>
<list>
<item><p><link href="http://www.valadoc.org/gtk+-3.0/Gtk.ListStore.html">Gtk.ListStore</link></p></item>
<item><p><link href="http://www.valadoc.org/gtk+-3.0/Gtk.ComboBox.html">Gtk.ComboBox</link></p></item>
<item><p><link href="http://www.valadoc.org/gtk+-3.0/Gtk.CellRendererText.html">Gtk.CellRendererText</link></p></item>
<item><p><link href="http://www.valadoc.org/gtk+-3.0/Gtk.CellLayout.set_attributes.html">set_attributes</link></p></item>
</list>
</page>
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