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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="gl">
<info>
<title type="text">Button (C)</title>
<link type="guide" xref="c#buttons"/>
<link type="seealso" xref="dialog.c"/>
<link type="seealso" xref="grid.c"/>
<revision version="0.2" date="2012-06-22" status="draft"/>
<credit type="author copyright">
<name>Monica Kochofar</name>
<email its:translate="no">monicakochofar@gmail.com</email>
<years>2012</years>
</credit>
<desc>A button widget which emits a signal when clicked</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Fran Dieguez</mal:name>
<mal:email>frandieguez@gnome.org</mal:email>
<mal:years>2012-2013.</mal:years>
</mal:credit>
</info>
<title>Botón</title>
<media type="image" mime="image/png" src="media/button.png"/>
<p>A button widget connected to a callback function that reverses its label when clicked.</p>
<code mime="text/x-csrc" style="numbered">
#include <gtk/gtk.h>
/*This is the callback function. It is a handler function which
reacts to the signal. In this case, it will cause the button label's
string to reverse.*/
static void
button_clicked (GtkButton *button,
gpointer user_data)
{
const char *old_label;
char *new_label;
old_label = gtk_button_get_label (button);
new_label = g_utf8_strreverse (old_label, -1);
gtk_button_set_label (button, new_label);
g_free (new_label);
}
static void
activate (GtkApplication *app,
gpointer user_data)
{
GtkWidget *window;
GtkWidget *button;
/*Create a window with a title and a default size*/
window = gtk_application_window_new (app);
gtk_window_set_title (GTK_WINDOW (window), "GNOME Button");
gtk_window_set_default_size (GTK_WINDOW (window), 250, 50);
/*Create a button with a label, and add it to the window*/
button = gtk_button_new_with_label ("Click Me");
gtk_container_add (GTK_CONTAINER (window), button);
/*Connecting the clicked signal to the callback function*/
g_signal_connect (GTK_BUTTON (button),
"clicked",
G_CALLBACK (button_clicked),
G_OBJECT (window));
gtk_widget_show_all (window);
}
int
main (int argc, char **argv)
{
GtkApplication *app;
int status;
app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
status = g_application_run (G_APPLICATION (app), argc, argv);
g_object_unref (app);
return status;
}
</code>
<p>Neste exemplo empregaremos o seguinte:</p>
<list>
<item><p><link href="http://developer.gnome.org/gtk3/3.4/GtkApplication.html">GtkApplication</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/3.4/GtkWindow.html">GtkWindow</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/stable/GtkButton.html">GtkButton</link></p></item>
<item><p><link href="http://developer.gnome.org/glib/stable/glib-Unicode-Manipulation.html#g-utf8-strreverse">Unicode Manipulation</link></p></item>
</list>
</page>
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