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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="button.c" xml:lang="es">
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<info>
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<title type="text">Botón (C)</title>
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<link type="guide" xref="c#buttons"/>
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<link type="seealso" xref="dialog.c"/>
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<link type="seealso" xref="grid.c"/>
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<revision version="0.2" date="2012-06-22" 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>Un widget de botón que emite una señal cuando se pulsa sobre él</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>Button</title>
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<media type="image" mime="image/png" src="media/button.png"/>
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Un widget de botón conectado a una función de retorno de llamada que invierte su etiqueta cuando se pulsa.
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#include <gtk/gtk.h>
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/*This is the callback function. It is a handler function which
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reacts to the signal. In this case, it will cause the button label's
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string to reverse.*/
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static void
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button_clicked (GtkButton *button,
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gpointer user_data)
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{
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const char *old_label;
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char *new_label;
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old_label = gtk_button_get_label (button);
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new_label = g_utf8_strreverse (old_label, -1);
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gtk_button_set_label (button, new_label);
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g_free (new_label);
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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 *button;
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/*Create a window with a title 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), "GNOME Button");
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gtk_window_set_default_size (GTK_WINDOW (window), 250, 50);
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/*Create a button with a label, and add it to the window*/
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button = gtk_button_new_with_label ("Click Me");
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gtk_container_add (GTK_CONTAINER (window), button);
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/*Connecting the clicked signal to the callback function*/
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g_signal_connect (GTK_BUTTON (button),
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"clicked",
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G_CALLBACK (button_clicked),
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G_OBJECT (window));
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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/gtk3/stable/GtkButton.html">GtkButton</link> </item>
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<item><link href="http://developer.gnome.org/glib/stable/glib-Unicode-Manipulation.html#g-utf8-strreverse">Manejo de Unicode</link> </item>
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</list>
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</page>
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