#-- keep track of currently selected genre/category
    __current = None
    @property
    def current(self):
        return self.__current
    @current.setter
    def current(self, newcat):
        __print__(dbg.PROC, "{}.current:={} ← from {}".format(self.module, newcat, [inspect.stack()[x][3] for x in range(1,4)]))
        self.__current = newcat
        return self.__current


    #--------------------------- initialization --------------------------------

        # add to main menu
        uikit.add_menu([parent.channelmenuitems], self.meta["title"], lambda w: parent.channel_switch_by_name(self.module) or 1)


    # Statusbar stub (defers to parent/main window, if in GUI mode)
    def status(self, *v):
        if self.parent: self.parent.status(*v)
        else: __print__(dbg.INFO, "status():", *v)


        
    #--------------------- streams/model data accesss ---------------------------
        
    # Get list of stations in current category
    def stations(self):

        # called to early
        if not category:
            print "load(None)"
            return

        # get data from cache or download
        if force or not category in self.streams:
            __print__(dbg.PROC, "load", "update_streams")
            self.status("Updating streams...")
            self.status(-0.1)
            if category == "empty":
                new_streams = self.empty_stub
            else:
                new_streams = self.update_streams(category)
  
            if new_streams:
                # check and modify entry;
                # assert that title and url are present
                modified = []
                for row in new_streams:
                    if len(set(["", None]) & set([row.get("title"), row.get("url")])):
                        continue
                    try:
                        modified.append( self.postprocess(row) )
                    except Exception as e:
                        __print__(e, dbg.DATA, "Missing title or url. Postprocessing failed:", row)
                new_streams = modified
  
                # don't lose forgotten streams
                if conf.retain_deleted:
                   self.streams[category] = new_streams + self.deleted_streams(new_streams, self.streams.get(category,[]))
                else:
                   self.streams[category] = new_streams
  
                # save in cache
                self.save()
  
            else:
                # parse error
                self.status("Category parsed empty.")
                self.streams[category] = self.nothing_found
                __print__(dbg.INFO, "Oooops, parser returned nothing for category " + category)
                
        # assign to treeview model
        uikit.do(lambda:uikit.columns(self.gtk_list, self.datamap, self.prepare(self.streams[category])))

        # set pointer
        self.current = category
        self.status("")

        
    # display .current category, once notebook/channel tab is first opened
    def first_show(self):

        # Already processed
        if (self.shown == 55555):
            return
        __print__(dbg.PROC, self.module, "→ first_show()", ", current=", self.current, ", categories=", len(self.categories))
    
        # if category tree is empty, initialize it
        if not self.categories:
            __print__(dbg.PROC, self.module, "→ first_show() → reload_categories()");
            try:
                self.reload_categories()
            except:
                __print__(dbg.ERR, "HTTP error or extraction failure.")
                self.categories = ["empty"]
            self.display_categories()

        # Select first category
        if not self.current:
            self.current = self.str_from_struct(self.categories) or None
            __print__(dbg.STAT, self.module, "→ first_show(); use first category as current =", self.current)
            self.shown = 0,

        # Show current category in any case
        __print__(dbg.UI, self.module, "→ first_show(); station list → load(", self.current, ")")
        uikit.do(self.load, self.current)
    
        # put selection/cursor on last position
        if True:#self.shown != None:
            __print__(dbg.STAT, self.module+".first_show()", "select last known category treelist position =", self.shown)
            try:
                uikit.do(lambda:self.gtk_list.get_selection().select_path(self.shown))
            except:
                pass
            
        # Invoke only once
        self.shown = 55555