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#include <stdlib.h>
#include <gtk/gtk.h>
#include <time.h>
#include <string.h>
GtkWidget *selection_button;
GtkWidget *selection_widget;
/* Callback when the user toggles the selection */
static void selection_toggled( GtkWidget *widget,
gint *have_selection )
{
if (GTK_TOGGLE_BUTTON (widget)->active)
{
*have_selection = gtk_selection_owner_set (selection_widget,
GDK_SELECTION_PRIMARY,
GDK_CURRENT_TIME);
/* if claiming the selection failed, we return the button to
the out state */
if (!*have_selection)
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (widget), FALSE);
}
else
{
if (*have_selection)
{
/* Before clearing the selection by setting the owner to NULL,
we check if we are the actual owner */
if (gdk_selection_owner_get (GDK_SELECTION_PRIMARY) == widget->window)
gtk_selection_owner_set (NULL, GDK_SELECTION_PRIMARY,
GDK_CURRENT_TIME);
*have_selection = FALSE;
}
}
}
/* Called when another application claims the selection */
static gboolean selection_clear( GtkWidget *widget,
GdkEventSelection *event,
gint *have_selection )
{
*have_selection = FALSE;
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (selection_button), FALSE);
return TRUE;
}
/* Supplies the current time as the selection. */
static void selection_handle( GtkWidget *widget,
GtkSelectionData *selection_data,
guint info,
guint time_stamp,
gpointer data )
{
gchar *timestr;
time_t current_time;
current_time = time (NULL);
timestr = asctime (localtime (¤t_time));
/* When we return a single string, it should not be null terminated.
That will be done for us */
gtk_selection_data_set (selection_data, GDK_SELECTION_TYPE_STRING,
8, timestr, strlen (timestr));
}
int main( int argc,
char *argv[] )
{
GtkWidget *window;
static int have_selection = FALSE;
gtk_init (&argc, &argv);
/* Create the toplevel window */
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Event Box");
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
g_signal_connect (G_OBJECT (window), "destroy",
G_CALLBACK (exit), NULL);
/* Create a toggle button to act as the selection */
selection_widget = gtk_invisible_new ();
selection_button = gtk_toggle_button_new_with_label ("Claim Selection");
gtk_container_add (GTK_CONTAINER (window), selection_button);
gtk_widget_show (selection_button);
g_signal_connect (G_OBJECT (selection_button), "toggled",
G_CALLBACK (selection_toggled), (gpointer) &have_selection);
g_signal_connect (G_OBJECT (selection_widget), "selection_clear_event",
G_CALLBACK (selection_clear), (gpointer) &have_selection);
gtk_selection_add_target (selection_widget,
GDK_SELECTION_PRIMARY,
GDK_SELECTION_TYPE_STRING,
1);
g_signal_connect (G_OBJECT (selection_widget), "selection_get",
G_CALLBACK (selection_handle), (gpointer) &have_selection);
gtk_widget_show (selection_button);
gtk_widget_show (window);
gtk_main ();
return 0;
}
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