Diff of /trunk/src/bct.c

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revision 127 by harbaum, Mon Sep 28 19:01:36 2009 UTC revision 128 by harbaum, Tue Sep 29 07:31:18 2009 UTC
# Line 17  Line 17 
17   * along with GPXView.  If not, see <http://www.gnu.org/licenses/>.   * along with GPXView.  If not, see <http://www.gnu.org/licenses/>.
18   */   */
19    
20    /*
21     * This simple breadcrumbtrail replacement is a simple hbox with
22     * buttons inside
23     */
24    
25  #include "gpxview.h"  #include "gpxview.h"
26    
27  GtkWidget *my_bct_new(void) {  typedef struct {
28    GtkWidget *label = gtk_label_new("BCT");    GtkWidget *button;
29      GDestroyNotify destroy;
30      gpointer id;
31    } crumb_t;
32    
33    typedef struct {
34      GtkWidget *back;
35    
36      GSList *crumbs;
37    } bct_priv_t;
38    
39    static void bct_free(gpointer data, gpointer user_data) {
40      g_free(data);
41    }
42    
43    static gint bct_destroy_event(GtkWidget *widget, gpointer data ) {
44      bct_priv_t *priv = (bct_priv_t*)data;
45    
46      g_slist_foreach(priv->crumbs, bct_free, NULL);
47      g_free(priv);
48    
49      return FALSE;
50    }
51    
52    static void crumb_destroy(bct_priv_t *priv, crumb_t *crumb) {
53      /* call destroy callback */
54      crumb->destroy(crumb->id);
55    
56      /* destroy it */
57      gtk_widget_destroy(crumb->button);
58    
59      /* remove element from list */
60      priv->crumbs = g_slist_remove(priv->crumbs, crumb);
61    
62      g_free(crumb);
63    }
64    
65    static void bct_update(bct_priv_t *priv) {
66      /* still something in list? */
67      if(g_slist_length(priv->crumbs)) {
68        crumb_t *crumb = g_slist_last(priv->crumbs)->data;
69        /* disable button now last in chain */
70        gtk_widget_set_sensitive(crumb->button, FALSE);
71      }
72    
73      /* disable back button if crumb trail has 1 item or less */
74      if(g_slist_length(priv->crumbs) <= 1)
75        gtk_widget_set_sensitive(priv->back, FALSE);
76    }
77    
78    static void on_back_clicked(GtkButton *button, bct_priv_t *priv) {
79      crumb_destroy(priv, g_slist_last(priv->crumbs)->data);
80      bct_update(priv);
81    }
82    
83    static void on_crumb_clicked(GtkButton *button, bct_priv_t *priv) {
84      /* clear crumb trail until we reach the button that was clicked */
85      crumb_t *crumb = g_slist_last(priv->crumbs)->data;
86      while(crumb->button != (GtkWidget*)button) {
87        crumb_destroy(priv, crumb);
88        crumb = g_slist_last(priv->crumbs)->data;
89      }
90      bct_update(priv);
91    }
92    
93    GtkWidget *bct_new(void) {
94      bct_priv_t *priv = g_new0(bct_priv_t, 1);
95    
96      GtkWidget *hbox = gtk_hbox_new(FALSE, 0);
97      g_object_set_data(G_OBJECT(hbox), "priv", priv);
98    
99      priv->back = gtk_button_new();
100      gtk_button_set_image(GTK_BUTTON(priv->back),
101            gtk_image_new_from_stock(GTK_STOCK_GO_BACK, GTK_ICON_SIZE_BUTTON));
102      gtk_widget_set_sensitive(priv->back, FALSE);
103      g_signal_connect(priv->back, "clicked",
104                       G_CALLBACK(on_back_clicked), priv);
105    
106      gtk_box_pack_start(GTK_BOX(hbox), priv->back, FALSE, FALSE, 0);
107    
108      g_signal_connect(G_OBJECT(hbox), "destroy",
109                       G_CALLBACK(bct_destroy_event), priv);
110    
111      return hbox;
112    }
113    
114    void bct_push_text(GtkWidget *bct, const gchar *text, gpointer id,
115                       GDestroyNotify destroy) {
116      bct_priv_t *priv = g_object_get_data(G_OBJECT(bct), "priv");
117      g_return_if_fail (priv);
118    
119      /* enable last crumb */
120      if(g_slist_length(priv->crumbs)) {
121        crumb_t *crumb = g_slist_last(priv->crumbs)->data;
122        gtk_widget_set_sensitive(crumb->button, TRUE);
123        gtk_widget_set_sensitive(priv->back, TRUE);
124      }
125    
126      /* create a new crumb */
127      crumb_t *crumb = g_new0(crumb_t, 1);
128    
129      /* append a new crumb */
130      crumb->button = gtk_button_new_with_label(text);
131      crumb->destroy = destroy;
132      crumb->id = id;
133    
134      gtk_box_pack_start(GTK_BOX(bct), crumb->button, FALSE, FALSE, 0);
135      gtk_widget_set_sensitive(crumb->button, FALSE);
136      gtk_widget_show(crumb->button);
137    
138      g_signal_connect(crumb->button, "clicked",
139                       G_CALLBACK(on_crumb_clicked), priv);
140    
141      /* append to list of crumbs */
142      priv->crumbs = g_slist_append(priv->crumbs, crumb);
143    
   return label;  
144  }  }
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