CaffGeek/MBACNationals

(function($){
    $.fn.filter_visible = function(depth) {
        depth = depth || 3;
        var is_visible = function() {
            var p = $(this), i;
            for(i=0; i<depth-1; ++i) {
                if (!p.is(':visible')) return false;
                p = p.parent();
            }
            return true;
        }
        return this.filter(is_visible);
    };
    $.table_hotkeys = function(table, keys, opts) {
        opts = $.extend($.table_hotkeys.defaults, opts);
        var selected_class, destructive_class, set_current_row, adjacent_row_callback, get_adjacent_row, adjacent_row, prev_row, next_row, check, get_first_row, get_last_row, make_key_callback, first_row;
        
        selected_class = opts.class_prefix + opts.selected_suffix;
        destructive_class = opts.class_prefix + opts.destructive_suffix
        set_current_row = function (tr) {
            if ($.table_hotkeys.current_row) $.table_hotkeys.current_row.removeClass(selected_class);
            tr.addClass(selected_class);
            tr[0].scrollIntoView(false);
            $.table_hotkeys.current_row = tr;
        };
        adjacent_row_callback = function(which) {
            if (!adjacent_row(which) && $.isFunction(opts[which+'_page_link_cb'])) {
                opts[which+'_page_link_cb']();
            }
        };
        get_adjacent_row = function(which) {
            var first_row, method;
            
            if (!$.table_hotkeys.current_row) {
                first_row = get_first_row();
                $.table_hotkeys.current_row = first_row;
                return first_row[0];
            }
            method = 'prev' == which? $.fn.prevAll : $.fn.nextAll;
            return method.call($.table_hotkeys.current_row, opts.cycle_expr).filter_visible()[0];
        };
        adjacent_row = function(which) {
            var adj = get_adjacent_row(which);
            if (!adj) return false;
            set_current_row($(adj));
            return true;
        };
        prev_row = function() { return adjacent_row('prev'); };
        next_row = function() { return adjacent_row('next'); };
        check = function() {
            $(opts.checkbox_expr, $.table_hotkeys.current_row).each(function() {
                this.checked = !this.checked;
            });
        };
        get_first_row = function() {
            return $(opts.cycle_expr, table).filter_visible().eq(opts.start_row_index);
        };
        get_last_row = function() {
            var rows = $(opts.cycle_expr, table).filter_visible();
            return rows.eq(rows.length-1);
        };
        make_key_callback = function(expr) {
            return function() {
                if ( null == $.table_hotkeys.current_row ) return false;
                var clickable = $(expr, $.table_hotkeys.current_row);
                if (!clickable.length) return false;
                if (clickable.is('.'+destructive_class)) next_row() || prev_row();
                clickable.click();
            }
        };
        first_row = get_first_row();
        if (!first_row.length) return;
        if (opts.highlight_first)
            set_current_row(first_row);
        else if (opts.highlight_last)
            set_current_row(get_last_row());
        $.hotkeys.add(opts.prev_key, opts.hotkeys_opts, function() {return adjacent_row_callback('prev')});
        $.hotkeys.add(opts.next_key, opts.hotkeys_opts, function() {return adjacent_row_callback('next')});
        $.hotkeys.add(opts.mark_key, opts.hotkeys_opts, check);
        $.each(keys, function() {
            var callback, key;
            
            if ($.isFunction(this[1])) {
                callback = this[1];
                key = this[0];
                $.hotkeys.add(key, opts.hotkeys_opts, function(event) { return callback(event, $.table_hotkeys.current_row); });
            } else {
                key = this;
                $.hotkeys.add(key, opts.hotkeys_opts, make_key_callback('.'+opts.class_prefix+key));
            }
        });

    };
    $.table_hotkeys.current_row = null;
    $.table_hotkeys.defaults = {cycle_expr: 'tr', class_prefix: 'vim-', selected_suffix: 'current',
        destructive_suffix: 'destructive', hotkeys_opts: {disableInInput: true, type: 'keypress'},
        checkbox_expr: ':checkbox', next_key: 'j', prev_key: 'k', mark_key: 'x',
        start_row_index: 2, highlight_first: false, highlight_last: false, next_page_link_cb: false, prev_page_link_cb: false};
})(jQuery);