/* * * Sample Code for Gtk+ Programming in C, 1st Edition, Prentice Hall * * Copyright 2000 - 2002 Syd Logan, All Rights Reserved * * This code is distributed without warranty. You are free to use this * code for any purpose, however, if this code is republished or * redistributed in its original form, as hardcopy or electronically, * then you must include this copyright notice along with the code. * * Questions or comments regarding this code or any bugs it contains can * be directed to the author via e-mail at slogan@cts.com **/#include <gtk/gtk.h>// forward declarations to avoid compiler warningsvoid ResetSettingsMenuItems( void );void UpdateChildren( void );void MessageBox( char *message );#define VERSION_MAJOR 1#define VERSION_MINOR 0// some globals to make life easystatic GtkWidget *container;static GNode *root;static GNode *current;static int n = 1;// tree nodetypedef struct _boxdata {	GtkWidget *container;		// the vbox or hbox instance	int spacing;			// current spacing	gboolean homogeneous;		// current homogeneous	int padding;			// current padding 	gboolean fill;			// current child fill 	gboolean expand;		// current child expand } BoxData;// used to hold callback data for settings dialogtypedef struct _settingsData {	GtkWidget *dialog;		// Padding/Spacing dialog	GtkWidget *pad_entry;		// Padding entry widget	GtkWidget *space_entry;		// Space entry widget} SettingsData;static SettingsData settingsData;	// dialog is modal, only need one// dump tree to stdoutgbooleantraverse_func( GNode *node, gpointer data ){	int i;	// indent	for ( i = 0; i < g_node_depth( node ) - 1; i++ )		printf( "  " );	// print the node	printf( "Node %x parent %x [%x] %s %s\n", node, node->parent, 		((BoxData *) node->data)->container, 		(GTK_IS_VBOX(((BoxData *)node->data)->container) 		? "VBox" : "Hbox" ), (node == current ? "<--" : "" ) );	return( FALSE );	// continue traversal}voiddump_tree( gpointer data, guint callback_action, GtkWidget *w ){	printf( "Tree Dump ********************************************************************\n" );	printf( "<-- is current box\n" );	g_node_traverse( root, G_PRE_ORDER, G_TRAVERSE_ALL, 999, 		traverse_func, NULL );}// traversal functionsstatic void go_up( gpointer data, guint callback_action, GtkWidget *w ){	if ( current != root ) {			current = current->parent;		container = (GtkWidget *)((BoxData *)current->data)->container;		}	dump_tree( (gpointer) NULL, 0, (GtkWidget *) NULL );	ResetSettingsMenuItems();}static void go_down( gpointer data, guint callback_action, GtkWidget *w ){	GNode *node;	node = g_node_first_child( current );	if ( node != (GNode *) NULL ) 		current = node;	container = (GtkWidget *)((BoxData *)current->data)->container;		dump_tree( (gpointer) NULL, 0, (GtkWidget *) NULL );	ResetSettingsMenuItems();}static void go_previous( gpointer data, guint callback_action, GtkWidget *w ){	GNode *node;	node = g_node_prev_sibling( current );	if ( node != (GNode *) NULL ) 		current = node;	container = (GtkWidget *)((BoxData *)current->data)->container;		dump_tree( (gpointer) NULL, 0, (GtkWidget *) NULL );	ResetSettingsMenuItems();}static void go_next( gpointer data, guint callback_action, GtkWidget *w ){	GNode *node;	node = g_node_next_sibling( current );	if ( node != (GNode *) NULL ) 		current = node;	container = (GtkWidget *)((BoxData *)current->data)->container;		dump_tree( (gpointer) NULL, 0, (GtkWidget *) NULL );	ResetSettingsMenuItems();}// box add functionsstatic void add_horz_box( gpointer data, guint callback_action, GtkWidget *w ){	GtkWidget *hbox;	GNode *node;	BoxData *boxData;	boxData = g_malloc( sizeof( BoxData ) ); 	hbox = gtk_hbox_new(FALSE, 0);	boxData->container = hbox;	boxData->homogeneous = FALSE;	boxData->fill = TRUE;				boxData->expand = TRUE;	boxData->padding = 0;	boxData->spacing = 0;	if ( callback_action == 0 )		gtk_box_pack_start( GTK_BOX(container), hbox, 			boxData->expand, boxData->fill, boxData->padding );	else		gtk_box_pack_end( GTK_BOX(container), hbox, 			boxData->expand, boxData->fill, boxData->padding );	node = g_node_new( (gpointer) boxData );	g_node_insert( current, -1, node );		dump_tree( (gpointer) NULL, 0, (GtkWidget *) NULL );	ResetSettingsMenuItems(); 	gtk_widget_show (hbox);}static void add_vert_box( gpointer data, guint callback_action, GtkWidget *w ){	GtkWidget *vbox;	GNode *node;	BoxData *boxData;	boxData = g_malloc( sizeof( BoxData ) ); 	vbox = gtk_vbox_new(FALSE, 0); 	gtk_container_add(GTK_CONTAINER(container), vbox);	boxData->container = vbox;	boxData->homogeneous = FALSE;	boxData->fill = TRUE;				boxData->expand = TRUE;	boxData->padding = 0;	boxData->spacing = 0;	if ( callback_action == 0 )		gtk_box_pack_start( GTK_BOX(container), vbox, 			boxData->expand, boxData->fill, boxData->padding );	else		gtk_box_pack_end( GTK_BOX(container), vbox, 			boxData->expand, boxData->fill, boxData->padding );	node = g_node_new( (gpointer) boxData );	g_node_insert( current, -1, node );		dump_tree( (gpointer) NULL, 0, (GtkWidget *) NULL );	ResetSettingsMenuItems(); 	gtk_widget_show (vbox);}// child (button) widget add functionsstatic void add_button_to_box_start( gpointer data, guint callback_action, GtkWidget *w ){	GtkWidget *button;	char buf[ 64 ];	sprintf( buf, "Start %d Box %x", n++, container );	button = gtk_button_new_with_label( buf ); 	gtk_box_pack_start( GTK_BOX(container), button, 		((BoxData *) current->data)->expand,		((BoxData *) current->data)->fill,		((BoxData *) current->data)->padding ); 	gtk_widget_show(button);}static void add_button_to_box_end( gpointer data, guint callback_action, GtkWidget *w ){	GtkWidget *button;	char buf[ 64 ];	sprintf( buf, "End %d Box %x", n++, container );	button = gtk_button_new_with_label( buf ); 	gtk_box_pack_end( GTK_BOX(container), button, 		((BoxData *) current->data)->expand,		((BoxData *) current->data)->fill,		((BoxData *) current->data)->padding ); 	gtk_widget_show (button);}// padding and spacing dialogstatic voidClickedCallback(GtkWidget *widget, gpointer unused){	char *data;	int spacing;	data = gtk_entry_get_text( GTK_ENTRY(settingsData.pad_entry) );	((BoxData *) current->data)->padding = atoi( data );	// get the spacing	data = gtk_entry_get_text( GTK_ENTRY(settingsData.space_entry) );	spacing = ((BoxData *) current->data)->spacing = atoi( data );	// make the change to spacing	gtk_box_set_spacing(GTK_BOX(((BoxData *) current->data)->container), 		spacing);	UpdateChildren();	gtk_widget_destroy( settingsData.dialog );}// make changes to children after a setting changevoidUpdateChildren( void ){	GtkBoxChild *child;	GList *children;	GtkBox *box;	gboolean expand, fill;	int padding;	GtkPackType type;	box = GTK_BOX(((BoxData *) current->data)->container);	children = box->children;	while ( children != (GList *) NULL ) {		child = (GtkBoxChild *) children->data;		gtk_box_query_child_packing(box, (GtkWidget *)child->widget, 			&expand, &fill, &padding, &type );		gtk_box_set_child_packing(box, (GtkWidget *) child->widget,			((BoxData *) current->data)->expand,			((BoxData *) current->data)->fill,			((BoxData *) current->data)->padding, type );		children = children->next;	}}// user canceled the settings dialogstatic voidCancelCallback(GtkWidget *widget, GtkWidget *dialog_window){	gtk_widget_destroy( dialog_window );}// display a dialog to get padding and spacing valuesvoidGetPaddingAndSpacing( void ){  GtkWidget *button, *label, *entry, *hbox, *dialog_window;	char buf[ 64 ];		// create the dialog and set attributes  settingsData.dialog = dialog_window = gtk_dialog_new();	gtk_window_set_modal(GTK_WINDOW(dialog_window), TRUE);  gtk_window_position(GTK_WINDOW (dialog_window), 		GTK_WIN_POS_MOUSE); 	gtk_window_set_title(GTK_WINDOW(dialog_window), 		"Padding and Spacing");	// fill in the content area 	hbox = gtk_hbox_new (FALSE, 1);  gtk_box_pack_start(GTK_BOX(GTK_DIALOG (dialog_window)->vbox),    hbox, FALSE, FALSE, 0);