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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="spinner.c" xml:lang="es">
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<info>
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<title type="text">Spinner (C)</title>
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<link type="guide" xref="c#display-widgets"/>
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<link type="seealso" xref="togglebutton.c"/>
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<revision version="0.1" date="2012-06-14" status="draft"/>
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<credit type="author copyright">
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<name>Monica Kochofar</name>
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<email its:translate="no">monicakochofar@gmail.com</email>
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<years>2012</years>
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</credit>
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<desc>Una animación giratoria</desc>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Daniel Mustieles</mal:name>
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<mal:email>daniel.mustieles@gmail.com</mal:email>
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<mal:years>2011 - 2017</mal:years>
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</mal:credit>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Nicolás Satragno</mal:name>
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<mal:email>nsatragno@gmail.com</mal:email>
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<mal:years>2012 - 2013</mal:years>
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</mal:credit>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Jorge González</mal:name>
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<mal:email>jorgegonz@svn.gnome.org</mal:email>
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<mal:years>2011</mal:years>
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</mal:credit>
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</info>
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<title>Spinner</title>
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<media type="image" mime="image/png" src="media/spinner.png"/>
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Este indicador de progreso está detenido y se inicia al pulsar la barra espaciadora.
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#include <gtk/gtk.h>
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/*Global variable used to indicate active state of the
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spinner. TRUE = active, FALSE = not-active. This is because
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there isn't a current function for C that does this for us*/
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gboolean active;
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/*This is the callback function. It is a handler function
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which reacts to the signal. In this case, it will cause the
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spinner to start and stop according to how many times the user
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presses the spacebar.*/
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static gboolean
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key_pressed_event (GtkWidget *widget,
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GdkEvent *event,
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gpointer user_data)
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{
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GtkWidget *spinner = user_data;
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guint keyval;
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/*Extracts the keyval from an event. And stores it in the variable
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"keyval" (we give the function the address). In this case, the
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event is GdkEventKey, a key press event*/
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gdk_event_get_keyval (event, &keyval);
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/*Grabbing the boolean value from the spinner*/
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g_object_get (GTK_SPINNER (spinner), "active", &active, NULL);
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if (keyval == GDK_KEY_space) {
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if (active) {
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gtk_spinner_stop (GTK_SPINNER (spinner));
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}
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else {
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gtk_spinner_start (GTK_SPINNER (spinner));
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}
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}
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return TRUE;
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}
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static void
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activate (GtkApplication *app,
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gpointer user_data)
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{
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GtkWidget *window;
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GtkWidget *spinner;
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/*Create a window with a title, border width and a default size*/
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window = gtk_application_window_new (app);
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gtk_window_set_title (GTK_WINDOW (window), "Spinner Example");
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gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
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gtk_container_set_border_width (GTK_CONTAINER(window), 30);
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/*Create a spinner, with extra horizontal and vertical space*/
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spinner = gtk_spinner_new ();
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gtk_spinner_start (GTK_SPINNER (spinner));
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gtk_container_add (GTK_CONTAINER (window), spinner);
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/*Connecting the key-press-event signal to the callback*/
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g_signal_connect (GTK_WINDOW (window), "key-press-event",
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G_CALLBACK (key_pressed_event), spinner);
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gtk_widget_show_all (window);
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}
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int
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main (int argc, char **argv)
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{
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GtkApplication *app;
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int status;
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app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
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g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
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status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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}
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En este ejemplo se usa lo siguiente:
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<list>
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<item><link href="http://developer.gnome.org/gtk3/3.4/GtkApplication.html">GtkApplication</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/3.4/GtkWindow.html">GtkWindow</link> </item>
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<item><link href="http://developer.gnome.org/gobject/stable/gobject-The-Base-Object-Type.html#g-object-get">GObject</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/stable/GtkSpinner.html">GtkSpinner</link> </item>
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</list>
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</page>
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