gnomeapp_ui.c

《Beginning Linux Programming》书的配置实例源代码。

/* GNOME front end to the CD database 
   developed in Beginning Linux Programming 2nd edition */

#include <gnome.h>
#include <stdlib.h>
#include <stdio.h>

#include "cd_data.h"


/* define local prototypes */ 
static void update_clist(void);
static void add_cd_dialog(void);
static void delete_cd_dialog(void);
static void add_track_dialog(void);
static void delete_track_dialog(void);
static void find_cat_entry(void);
static gint get_row(gchar *catalog);
static void update_track_list(void);
static gint count_track_entries(void);
static void create_main_window(void);
static void set_insensitive(void);
static void show_about_dialog(void);

/* define global variables - a data structure would be better */
GtkWidget *cd_list;
GtkWidget *track_list;
GtkWidget *track_frame;
cdc_entry selected_cdc_entry;
gint selected_track;


/* Menu and toolbar definitions */
GnomeUIInfo file_menu[] = {
	GNOMEUIINFO_MENU_EXIT_ITEM(gtk_main_quit, NULL),
	GNOMEUIINFO_END
};


GnomeUIInfo edit_menu[] = {
	GNOMEUIINFO_MENU_FIND_ITEM(find_cat_entry, NULL),
	GNOMEUIINFO_END
};

GnomeUIInfo help_menu[] = {
	GNOMEUIINFO_MENU_ABOUT_ITEM(show_about_dialog, NULL),
	GNOMEUIINFO_END
};

GnomeUIInfo menubar[] = {
	GNOMEUIINFO_MENU_FILE_TREE(file_menu),
	GNOMEUIINFO_MENU_EDIT_TREE(edit_menu),
	GNOMEUIINFO_MENU_HELP_TREE(help_menu),
	GNOMEUIINFO_END
};

GnomeUIInfo toolbar[] = {
	GNOMEUIINFO_ITEM_STOCK("New", "Add a Cd",
						add_cd_dialog,
						GNOME_STOCK_PIXMAP_CDROM),
	GNOMEUIINFO_ITEM_STOCK("Delete", "Delete a Cd",
						delete_cd_dialog,
						GNOME_STOCK_PIXMAP_CLOSE),
	GNOMEUIINFO_ITEM_STOCK("Find", "Find a Cd",
					find_cat_entry,
					GNOME_STOCK_PIXMAP_SEARCH),
	GNOMEUIINFO_SEPARATOR,
	
	GNOMEUIINFO_ITEM_STOCK("Exit", "Exit the application",
					gtk_main_quit,
					GNOME_STOCK_PIXMAP_EXIT),
	GNOMEUIINFO_END
};

static void show_about_dialog()
{
    GtkWidget *about;
    const gchar *authors[] = { "Wrox Press et al", NULL};
    
    about = gnome_about_new("CD Database", "0.1",
			    "GNU Public License",
			    authors,
			    "The GNOME front end to the CD Database developed in 'Beginning Linux Programming 2nd edition'",
			    NULL);
    gtk_widget_show(about);
}

static void select_row_callback(GtkWidget *cd_list, 
					gint row,
					gint column,
					GdkEventButton *event,
					gpointer data)
{	
    gchar *row_text;

    gtk_widget_set_sensitive(track_frame, TRUE); /* unshade the track frame */
    gtk_clist_get_text (GTK_CLIST (cd_list), row, 0, &row_text); /* get the catalog of the selected cd */
    selected_cdc_entry = get_cdc_entry(row_text); /* update our global variable */
    update_track_list(); /* redraw the track list to show the tracks for the selected cd */
}
	
static void update_track_list () /* redraw the track list based on the currently selected cd */
{
    gchar *text[2];
    cdt_entry entry_found;
    gint track_no = 1;
    gchar buffer[70];
	
    gtk_clist_clear (GTK_CLIST (track_list)); /* clear the track list */
    text[0] = buffer;
		
	
    do {
	entry_found = get_cdt_entry(selected_cdc_entry.catalog, track_no);
	if (entry_found.catalog[0]) {
	    sprintf(text[0], "%d", entry_found.track_no); /* place the track number in the first column */
	    text[1] = entry_found.track_txt; /* place the track text in the second column */
	    gtk_clist_append (GTK_CLIST(track_list), text);   /* add the row */
	    track_no++; /* do the next track */
	}
    } while (entry_found.catalog[0]); 
}	

void select_track_row_callback(GtkWidget *cd_list,
				   gint row,
				   gint column,
				   GdkEventButton *event,
				   gpointer data)
{		
	selected_track = row + 1; /* update the selected track global variable */
				  /* rows start from zero, so add one to get the track number */
}
	

static void update_clist() /* update the cd list */
{
    cdc_entry item_found;
    gint first_call = 1;
    gchar *text[4];
    gchar *null_text = ""; /* we get all the cds from the database by searching for a null string */
    gint row;
   	
    gtk_clist_clear (GTK_CLIST (cd_list)); /* clear the list */
  	
    item_found = search_cdc_entry(null_text, &first_call);
    while (item_found.catalog[0] != '\0') { /* add cds row by row */
	    text[0] = item_found.catalog;
	    text[1] = item_found.title;
	    text[2] = item_found.type;
	    text[3] = item_found.artist;
	
	    row = gtk_clist_append (GTK_CLIST(cd_list), text); 
	    item_found = search_cdc_entry(null_text, &first_call);
    }
    gtk_clist_sort(GTK_CLIST(cd_list)); 
}	
 	
static void add_cd_dialog()
{
    GtkWidget *dialog;
    GtkWidget *label;
    GtkWidget *hbox;
    GtkWidget *catalog, *title, *type, *artist;
    cdc_entry new_entry;
    gint i;	

    memset(&new_entry ,'\0', sizeof(new_entry));

    dialog = gnome_dialog_new("Add new CD",
		 GNOME_STOCK_BUTTON_OK,
		 GNOME_STOCK_BUTTON_CLOSE,
		 NULL);
    hbox = gtk_hbox_new (FALSE, 0);
    label = gtk_label_new ("Catalog Entry: ");
    catalog = gtk_entry_new_with_max_length (CAT_CAT_LEN);
    gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (hbox), catalog, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (GNOME_DIALOG (dialog)->vbox), hbox, FALSE, FALSE, 0);

    hbox = gtk_hbox_new (FALSE, 0);
    label = gtk_label_new ("Title: ");
    title = gtk_entry_new_with_max_length (CAT_TITLE_LEN);
    gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (hbox), title, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (GNOME_DIALOG (dialog)->vbox), hbox, FALSE, FALSE, 0);

    hbox = gtk_hbox_new (FALSE, 0);
    label = gtk_label_new ("Type: ");
    type = gtk_entry_new_with_max_length (CAT_TYPE_LEN);
    gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (hbox), type, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (GNOME_DIALOG (dialog)->vbox), hbox, FALSE, FALSE, 0);

    hbox = gtk_hbox_new (FALSE, 0);
    label = gtk_label_new ("Artist: ");
    artist = gtk_entry_new_with_max_length (CAT_ARTIST_LEN);
    gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (hbox), artist, FALSE, FALSE, 0);

    gtk_box_pack_start (GTK_BOX (GNOME_DIALOG (dialog)->vbox), hbox, FALSE, FALSE, 0);

    gtk_widget_show_all (dialog);

    i = gnome_dialog_run(GNOME_DIALOG (dialog));
 		
    if (i==0) {
 	strncpy(new_entry.catalog, gtk_entry_get_text (GTK_ENTRY (catalog)), CAT_CAT_LEN - 1);
 	strncpy(new_entry.title, gtk_entry_get_text (GTK_ENTRY(title)), CAT_TITLE_LEN - 1);
 	strncpy(new_entry.type, gtk_entry_get_text (GTK_ENTRY(type)), CAT_TYPE_LEN - 1);
    	strncpy(new_entry.artist, gtk_entry_get_text (GTK_ENTRY(artist)), CAT_ARTIST_LEN - 1);
    	
    	add_cdc_entry(new_entry);
    	update_clist();
    }
    gnome_dialog_close (GNOME_DIALOG (dialog));    
}

static void delete_cd_dialog()  
{
    GtkWidget *dialog;
    gint track_no = 1;
    gint i;
    gint delete_ok;
	
    dialog = gnome_message_box_new ("Are you sure you want to delete this entry and all its tracks?",
								GNOME_MESSAGE_BOX_QUESTION,
								GNOME_STOCK_BUTTON_YES,
								GNOME_STOCK_BUTTON_CANCEL,
								NULL);
    gtk_widget_show_all (dialog);
    i = gnome_dialog_run(GNOME_DIALOG (dialog));
    if (i==0) {
	 do {
	      delete_ok = del_cdt_entry(selected_cdc_entry.catalog, track_no);
	      track_no++;
	 } while (delete_ok);
	 del_cdc_entry(selected_cdc_entry.catalog);
	 update_clist();
	 gtk_clist_clear (GTK_CLIST (track_list));
	 set_insensitive();	 
    }

}

static void add_track_dialog()
{
    GtkWidget *dialog;
    GtkWidget *label;
    GtkWidget *hbox;
    GtkWidget *spin_button, *description;
    GtkObject *spinner_adj;
    cdt_entry new_track;
    gint next_track;
    gint i;
    
    memset(&new_track, '\0', sizeof(new_track));
	
    dialog = gnome_dialog_new("Add a track",
		 GNOME_STOCK_BUTTON_OK,
		 GNOME_STOCK_BUTTON_CLOSE,
		 NULL);
    next_track = count_track_entries() + 1; /* we count the number of tracks for this cd      */
					    /* so we can only add a track with a track number */
					    /* 1 greater than the current number of tracks    */	
    spinner_adj = gtk_adjustment_new((gfloat) (next_track), 1.0, (gfloat) (next_track), 1.0, 1.0, 1.0);
	
    hbox = gtk_hbox_new (FALSE, 2);
    label = gtk_label_new ("Track number: ");
	
    spin_button = gtk_spin_button_new (GTK_ADJUSTMENT (spinner_adj), 1.0, 0.0);
    gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spin_button), TRUE);