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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; }