GTK+ Forums

Micah Carrick

Almost forgot I had this one laying around.

main.c

Code: (C)

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/*
* main.c
* Copyright (C) Micah Carrick 2006 <email@micahcarrick.com>
*
* main.c is free software.
*
* You may redistribute it and/or modify it under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* main.c is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with main.c. If not, write to:
* The Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301, USA.
*/

/*
cc -o example -Wall -g main.c `pkg-config --cflags --libs gtk+-2.0 libglade-2.0`
*/

#include <gtk/gtk.h>
#include <glade/glade.h>
#include <time.h>

/* glade interface file is in same path as the executable */
#define GLADE_FILE "gui.glade"

/* signal callbacks */
void on_window1_destroy (GtkWidget *widget, gpointer user_data);
void on_quit_activate (GtkMenuItem *item, gpointer user_data);

/* user functions */
gboolean update_clock (gpointer label);

int
main (int argc, char *argv[])
{

GtkWidget *main_window;
GtkWidget *clock_label;
GladeXML *gxml;

/* initialize the GTK+ library */
gtk_init (&argc, &argv);

/*
create an instance of the GladeXML object and build widgets within
the window1 root node.
*/
gxml = glade_xml_new (GLADE_FILE, NULL, NULL);

/* get needed widgets from the glade XML file */
main_window = glade_xml_get_widget (gxml, "window1");
clock_label = glade_xml_get_widget (gxml, "label1");

/* connect signals */
glade_xml_signal_connect (gxml, "on_window1_destroy",
G_CALLBACK(on_window1_destroy));

glade_xml_signal_connect (gxml, "on_quit_activate",
G_CALLBACK(on_quit_activate));

/* show the main window */
gtk_widget_show (main_window);

/* set timeout */
g_timeout_add (500, update_clock, (gpointer)clock_label);

/* begin main GTK loop */
gtk_main ();

return 0;
}

void
on_window1_destroy (GtkWidget *widget, gpointer user_data)
{
/* break gtk_main() loop */
gtk_main_quit();
}

void
on_quit_activate (GtkMenuItem *item, gpointer user_data)
{
/* break gtk_main() loop */
gtk_main_quit();
}

gboolean
update_clock(gpointer label)
{
/* the GtkLabel is passed in as user data */

time_t simple_time;
struct tm *time_info;
gchar *str = g_new(gchar, 25); /* allocate 25 characters for time */

/* get simple time and convert it into a tm structure */
time (&simple_time);
time_info = localtime(&simple_time);

/* %X = Preferred time of day representation for current locale. */
strftime(str, 25, "%X", time_info);

/* update the label */
gtk_label_set_text(GTK_LABEL(label), str);

g_free(str); /* free memory*/

return TRUE;
}

gui.glade

Code: (Plaintext)

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<?xml version="1.0" standalone="no"?> 
<!DOCTYPE glade-interface SYSTEM "http://glade.gnome.org/glade-2.0.dtd">

<glade-interface>

<widget class="GtkWindow" id="window1">
<property name="visible">True</property>
<property name="title" translatable="yes">Clock</property>
<property name="type">GTK_WINDOW_TOPLEVEL</property>
<property name="window_position">GTK_WIN_POS_NONE</property>
<property name="modal">False</property>
<property name="default_width">200</property>
<property name="default_height">100</property>
<property name="resizable">True</property>
<property name="destroy_with_parent">False</property>
<property name="decorated">True</property>
<property name="skip_taskbar_hint">False</property>
<property name="skip_pager_hint">False</property>
<property name="type_hint">GDK_WINDOW_TYPE_HINT_NORMAL</property>
<property name="gravity">GDK_GRAVITY_NORTH_WEST</property>
<property name="focus_on_map">True</property>
<property name="urgency_hint">False</property>
<signal name="destroy" handler="on_window1_destroy" last_modification_time="Thu, 09 Mar 2006 23:35:37 GMT"/>

<child>
<widget class="GtkVBox" id="vbox1">
<property name="visible">True</property>
<property name="homogeneous">False</property>
<property name="spacing">0</property>

<child>
<widget class="GtkMenuBar" id="menubar1">
<property name="visible">True</property>
<property name="pack_direction">GTK_PACK_DIRECTION_LTR</property>
<property name="child_pack_direction">GTK_PACK_DIRECTION_LTR</property>

<child>
<widget class="GtkMenuItem" id="menuitem1">
<property name="visible">True</property>
<property name="label" translatable="yes">_File</property>
<property name="use_underline">True</property>

<child>
<widget class="GtkMenu" id="menuitem1_menu">

<child>
<widget class="GtkImageMenuItem" id="quit">
<property name="visible">True</property>
<property name="label">gtk-quit</property>
<property name="use_stock">True</property>
<signal name="activate" handler="on_quit_activate" last_modification_time="Sun, 09 Jul 2006 20:56:30 GMT"/>
</widget>
</child>
</widget>
</child>
</widget>
</child>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">False</property>
<property name="fill">False</property>
</packing>
</child>

<child>
<widget class="GtkLabel" id="label1">
<property name="visible">True</property>
<property name="label" translatable="yes">Label1</property>
<property name="use_underline">False</property>
<property name="use_markup">False</property>
<property name="justify">GTK_JUSTIFY_LEFT</property>
<property name="wrap">False</property>
<property name="selectable">False</property>
<property name="xalign">0.5</property>
<property name="yalign">0.5</property>
<property name="xpad">0</property>
<property name="ypad">0</property>
<property name="ellipsize">PANGO_ELLIPSIZE_NONE</property>
<property name="width_chars">-1</property>
<property name="single_line_mode">False</property>
<property name="angle">0</property>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">True</property>
<property name="fill">True</property>
</packing>
</child>
</widget>
</child>
</widget>

</glade-interface>

Compile and run

Code: (Plaintext)
1 2 3	cc -o example -Wall -g main.c `pkg-config --cflags --libs gtk+-2.0 libglade-2.0` ./example

Last edited by Micah Carrick on Fri Nov 30, 2007 10:04 pm; edited 2 times in total

openldev · Posted: Tue Oct 30, 2007 8:04 pm Post subject:

People should note that Micah uses time() to keep track of the time, not just a timeout with a delay of 1000 ms. The next timeout is not run until 1000 ms after the previous finishes, so the delay from running the timeout adds to the total delay! (Micah implements this correctly!)

Micah Carrick · Posted: Tue Oct 30, 2007 8:35 pm Post subject:

Good point. As a rule, don't use g_timout_xx functions for precise timing. From the API: