Fixed Container
The Fixed container allows you to place widgets at a fixed position within it's window, relative to it's upper left hand corner. The position of the widgets can be changed dynamically.
There are only a few functions associated with the fixed widget:
GtkWidget* gtk_fixed_new( void );
void gtk_fixed_put( GtkFixed *fixed,
GtkWidget *widget,
gint x,
gint y );
void gtk_fixed_move( GtkFixed *fixed,
GtkWidget *widget,
gint x,
gint y ); |
The function gtk_fixed_new() allows you to create a new Fixed container.
gtk_fixed_put() places widget in the container fixed at the position specified by x and y.
gtk_fixed_move() allows the specified widget to be moved to a new position.
void gtk_fixed_set_has_window( GtkFixed *fixed,
gboolean has_window );
gboolean gtk_fixed_get_has_window( GtkFixed *fixed ); |
Normally, Fixed widgets don't have their own X window. Since this is different from the behaviour of Fixed widgets in earlier releases of GTK, the function gtk_fixed_set_has_window() allows the creation of Fixed widgets with their own window. It has to be called before realizing the widget.
The following example illustrates how to use the Fixed Container.
#include <gtk/gtk.h>
/* I'm going to be lazy and use some global variables to
* store the position of the widget within the fixed
* container */
gint x = 50;
gint y = 50;
/* This callback function moves the button to a new position
* in the Fixed container. */
void move_button( GtkWidget *widget,
GtkWidget *fixed )
{
x = (x + 30) % 300;
y = (y + 50) % 300;
gtk_fixed_move (GTK_FIXED (fixed), widget, x, y);
}
int main( int argc,
char *argv[] )
{
/* GtkWidget is the storage type for widgets */
GtkWidget *window;
GtkWidget *fixed;
GtkWidget *button;
gint i;
/* Initialise GTK */
gtk_init (&argc, &argv);
/* Create a new window */
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Fixed Container");
/* Here we connect the "destroy" event to a signal handler */
g_signal_connect (G_OBJECT (window), "destroy",
G_CALLBACK (gtk_main_quit), NULL);
/* Sets the border width of the window. */
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
/* Create a Fixed Container */
fixed = gtk_fixed_new ();
gtk_container_add (GTK_CONTAINER (window), fixed);
gtk_widget_show (fixed);
for (i = 1 ; i <= 3 ; i++) {
/* Creates a new button with the label "Press me" */
button = gtk_button_new_with_label ("Press me");
/* When the button receives the "clicked" signal, it will call the
* function move_button() passing it the Fixed Container as its
* argument. */
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (move_button), fixed);
/* This packs the button into the fixed containers window. */
gtk_fixed_put (GTK_FIXED (fixed), button, i*50, i*50);
/* The final step is to display this newly created widget. */
gtk_widget_show (button);
}
/* Display the window */
gtk_widget_show (window);
/* Enter the event loop */
gtk_main ();
return 0;
} |