--- trunk/src/map-tool.c	2009/10/27 08:38:31	144
+++ trunk/src/map-tool.c	2009/11/03 08:38:23	155
@@ -22,6 +22,13 @@
  * http://topo.geofabrik.de/trail/${z}/${x}/${y}.png   8-15
  */
 
+/*
+ * TODO: 
+ * - draw caches only once
+ * - prefer duplicates from selected files
+ * - make semi-transparent caches selectable
+ */
+
 #include "gpxview.h"
 #include "converter.h"
 #include <math.h>    // for isnan
@@ -109,14 +116,18 @@
 
 static gboolean map_gps_update(gpointer data) {
   map_context_t *context = (map_context_t*)data;
+  static gboolean goto_is_enabled = FALSE;
 
   /* get reference position ... */
   pos_t *refpos = get_pos(context->appdata);
   gboolean ok = (refpos!= NULL) && !isnan(refpos->lat) && !isnan(refpos->lon);
 
   /* ... and enable "goto" button if it's valid */
-  osm_gps_map_osd_enable_gps (OSM_GPS_MAP(context->widget), 
-		 OSM_GPS_MAP_OSD_CALLBACK(ok?cb_map_gps:NULL), context);
+  if(ok != goto_is_enabled) {
+    osm_gps_map_osd_enable_gps (OSM_GPS_MAP(context->widget), 
+		OSM_GPS_MAP_OSD_CALLBACK(ok?cb_map_gps:NULL), context);
+    goto_is_enabled = ok;
+  }
 
   if(ok) {
     float heading = NAN;
@@ -131,6 +142,8 @@
 	radius = dist2pixel(context, eph/1000, refpos->lat);
     }
 
+    /* TODO: in order to save energy: only draw if state actually changed */
+
     g_object_set(context->widget, "gps-track-highlight-radius", radius, NULL);
     osm_gps_map_draw_gps(OSM_GPS_MAP(context->widget), 
 			 refpos->lat, refpos->lon, heading);
@@ -140,8 +153,9 @@
   return TRUE;
 }
 
-static void map_draw_cache(GtkWidget *map, cache_t *cache) {
-  GdkPixbuf *icon = icon_get(ICON_CACHE_TYPE, cache->type);
+static void map_draw_cache(GtkWidget *map, cache_t *cache, gboolean semi) {
+  GdkPixbuf *icon = icon_get(semi?ICON_CACHE_TYPE_SEMI:ICON_CACHE_TYPE, 
+			     cache->type);
 
   /* check if there's also an overwritten coordinate */
   if(cache->notes && cache->notes->override) {
@@ -159,7 +173,9 @@
   }
 }
 
-static void map_draw_gpx(appdata_t *appdata, GtkWidget *map, gpx_t *gpx) {
+static void map_draw_gpx(appdata_t *appdata, cache_display_t *caches, 
+			 GtkWidget *map, gpx_t *gpx,
+			 cache_t *nav, gboolean semi) {
   if(!gpx->notes_loaded) {
     notes_load_all(appdata, gpx);
     gpx->notes_loaded = TRUE;
@@ -167,7 +183,18 @@
 
   cache_t *cache = gpx->cache;
   while(cache) {
-    map_draw_cache(map, cache);
+    /* search if we have that cache already in our list/displayed */
+    int i=0;
+    while(caches[i].id && (strcmp(caches[i].id, cache->id) != 0))
+      i++;
+
+    if(!caches[i].id) {
+      /* if nav is given draw all other caches semitransparent. */
+      /* if nav is not given do what semi sais */
+      map_draw_cache(map, cache, nav?(cache != nav):semi);
+      caches[i].id = cache->id;
+    }
+
     cache = cache->next;
   }
 }
@@ -176,6 +203,23 @@
 static void map_setup(map_context_t *context) {
   char *name = NULL;
 
+  int cache_num = gpx_total_caches_global(context->appdata->gpx);
+
+  if(context->caches_displayed && (cache_num != context->cache_list_len)) {
+    //    printf("re-alloc because %p %d/%d\n", context->caches_displayed,
+    //	   cache_num, context->cache_list_len);
+    g_free(context->caches_displayed);
+    context->caches_displayed = NULL;
+    context->cache_list_len = 0;
+  }
+
+  /* allocate buffer */
+  if(cache_num && !context->caches_displayed) {
+    context->cache_list_len = cache_num;
+    context->caches_displayed = g_new0(cache_display_t, cache_num+1);
+    printf("allocated space to handle %d map icons\n", cache_num);
+  }
+
   if(!context->appdata->cur_gpx && !context->appdata->cur_cache) {
     if(context->state != MAP_ALL) {
       printf("map_setup(ALL)\n");
@@ -185,15 +229,25 @@
       osm_gps_map_osd_clear_nav (OSM_GPS_MAP(context->widget));
 #endif
 
-      /* clear all existing ccahe images */
+      /* clear all existing cache images */
       osm_gps_map_clear_images (OSM_GPS_MAP(context->widget));
+      memset(context->caches_displayed, 0, 
+	     (cache_num+1) * sizeof(cache_display_t));
 
-      /* draw all geocaches */
+      /* draw all geocaches and none is semi-transparent */
       gpx_t *gpx = context->appdata->gpx;
       while(gpx) {
-	map_draw_gpx(context->appdata, context->widget, gpx);
+	map_draw_gpx(context->appdata, context->caches_displayed, 
+		     context->widget, gpx, NULL, FALSE);
 	gpx = gpx->next;
       }
+
+      {
+	int i=0;
+	while(context->caches_displayed[i].id) i++;
+	printf("number of caches actually displayed: %d\n", i);
+      }
+
       name = g_strdup(_("all"));
       context->state = MAP_ALL;
     }
@@ -208,16 +262,29 @@
 
       /* clear all existing ccahe images */
       osm_gps_map_clear_images (OSM_GPS_MAP(context->widget));
+      memset(context->caches_displayed, 0, 
+	     (cache_num+1) * sizeof(cache_display_t));
+
+      /* draw all geocaches and all other gpx files are semi-transparent */
+      map_draw_gpx(context->appdata, context->caches_displayed, 
+		   context->widget, context->appdata->cur_gpx, NULL, FALSE);
+
+      gpx_t *gpx = context->appdata->gpx;
+      while(gpx) {
+	if(gpx != context->appdata->cur_gpx) 
+	  map_draw_gpx(context->appdata, context->caches_displayed, 
+		       context->widget, gpx, NULL, TRUE);
+
+	gpx = gpx->next;
+      }
 
-      map_draw_gpx(context->appdata, context->widget, 
-		   context->appdata->cur_gpx);
       name = g_strdup(context->appdata->cur_gpx->name);
       context->state = MAP_GPX;
     }
   } else {
     cache_t *cache = context->appdata->cur_cache;
     
-    printf("map_setp(CACHE)\n");
+    printf("map_setup(CACHE)\n");
     
     /* no balloons in this mode */
     context->balloon = NULL;
@@ -225,8 +292,17 @@
     
     /* clear all existing ccahe images */
     osm_gps_map_clear_images (OSM_GPS_MAP(context->widget));
+    memset(context->caches_displayed, 0, 
+	   (cache_num+1) * sizeof(cache_display_t));
     
-    map_draw_cache(context->widget, cache);
+    /* draw all geocaches and all but selected one are semi-transparent */
+    gpx_t *gpx = context->appdata->gpx;
+    while(gpx) {
+      map_draw_gpx(context->appdata, context->caches_displayed, 
+		   context->widget, gpx, cache, FALSE);
+      gpx = gpx->next;
+    }
+
     name = g_strdup(cache->name);
     context->state = MAP_CACHE;
     
@@ -402,6 +478,7 @@
 			       gdk_pixbuf_get_height(buf));
 
   // Create the new Context for the ImageSurface
+  g_assert(image_surface);
   cairo_t *context = cairo_create(image_surface);
 
   // Draw the image on the new Context
@@ -664,6 +741,12 @@
 #endif
 
   gtk_timeout_remove(context->handler_id);
+  gps_unregister_callback(appdata, context->cb_id);
+
+  if(context->caches_displayed) {
+    g_free(context->caches_displayed);
+    context->caches_displayed = NULL;
+  }
 
   g_free(context);
   appdata->map.context = NULL;
@@ -707,6 +790,12 @@
 #endif
 }
 
+/* callback called by the gps layer whenever gps state changes */
+static void 
+gps_callback(struct gps_state *state, gpointer data) {
+  printf("map: gps callback\n");
+}
+
 void map(appdata_t *appdata) {
   map_context_t *context = NULL; 
 
@@ -797,6 +886,7 @@
 
   /* install handler for timed updates of the gps button */
   context->handler_id = gtk_timeout_add(1000, map_gps_update, context);
+  context->cb_id = gps_register_callback(appdata, gps_callback, context);
 
 #if MAEMO_VERSION_MAJOR == 5
   /* prevent some of the main screen things */