# ComboBox (Vala)

Tiffany Antopolski
tiffany.antopolski@gmail.com 2013
Ένα γραφικό στοιχείο χρησιμοποιείται για επιλογή από μια λίστα στοιχείων
Ελληνική μεταφραστική ομάδα GNOME
team@gnome.gr 2012-2015
Δημήτρης Σπίγγος
dmtrs32@gmail.com 2012, 2013
Μαρία Θουκιδίδου
marablack3@gmail.com 2014
Θάνος Τρυφωνίδης
tomtryf@gmail.com 2014, 2015

# ComboBox (δύο στήλες)

Αυτό το ComboBox τυπώνει στον τερματικό την επιλογή σας όταν την αλλάζετε.

# Ο χρησιμοποιούμενος κώδικας για παραγωγή αυτού παραδείγματος

class MyWindow : Gtk.ApplicationWindow {

string[] file = {"Select", "New", "Open", "Save"}; string[] stock_item = {"","gtk-new", "gtk-open", "gtk-save"};

enum Column { FILE, STOCK_ITEM }

/* 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 (2, typeof (string), typeof (string));

for (int i = 0; i < file.length; i++){ Gtk.TreeIter iter; liststore.append (out iter); liststore.set (iter, Column.FILE, file[i]); liststore.set (iter, Column.STOCK_ITEM, stock_item[i]); }

Gtk.ComboBox combobox = new Gtk.ComboBox.with_model (liststore);

/* CellRenderers render the data. */ Gtk.CellRendererText cell = new Gtk.CellRendererText (); Gtk.CellRendererPixbuf cell_pb = new Gtk.CellRendererPixbuf ();

/* we pack the cell into the beginning of the combobox, allocating * no more space than needed; * first the image, then the text; * note that it does not matter in which order they are in the model, * the visualization is decided by the order of the cellrenderers */ combobox.pack_start (cell_pb, false); combobox.pack_start (cell, false);

/* associate a property of the cellrenderer to a column in the model * used by the combobox */ combobox.set_attributes (cell_pb, "stock_id", Column.STOCK_ITEM); combobox.set_attributes (cell, "text", Column.FILE);

/* 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 (); }

void item_changed (Gtk.ComboBox combo) { if (combo.get_active () !=0) { print ("You chose " + file [combo.get_active ()] +"\n"); } } }

class MyApplication : Gtk.Application { protected override void activate () { new MyWindow (this).show (); } }

int main (string[] args) { return new MyApplication ().run (args); }

# Αναφορές API

Σε αυτό το παράδειγμα χρησιμοποιήσαμε τα παρακάτω:

GtkComboBox

GtkListStore

GtkCellRendererText

GtkCellRendererPixbuf

Stock Items