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DrawingBoard.Control.Navigation = DrawingBoard.Control.extend({

        name: 'navigation',

        defaults: {
                back: true,
                forward: true,
                reset: true
        },

        initialize: function() {
                var el = '';
                if (this.opts.back) el += '<button class="drawing-board-control-navigation-back">&larr;</button>';
                if (this.opts.forward) el += '<button class="drawing-board-control-navigation-forward">&rarr;</button>';
                if (this.opts.reset) el += '<button class="drawing-board-control-navigation-reset">&times;</button>';
                this.$el.append(el);

                if (this.opts.back) {
                        var $back = this.$el.find('.drawing-board-control-navigation-back');
                        this.board.ev.bind('historyNavigation', $.proxy(this.updateBack, this, $back));
                        this.$el.on('click', '.drawing-board-control-navigation-back', $.proxy(function(e) {
                                this.board.goBackInHistory();
                                e.preventDefault();
                        }, this));

                        this.updateBack($back);
                }

                if (this.opts.forward) {
                        var $forward = this.$el.find('.drawing-board-control-navigation-forward');
                        this.board.ev.bind('historyNavigation', $.proxy(this.updateForward, this, $forward));
                        this.$el.on('click', '.drawing-board-control-navigation-forward', $.proxy(function(e) {
                                this.board.goForthInHistory();
                                e.preventDefault();
                        }, this));

                        this.updateForward($forward);
                }

                if (this.opts.reset) {
                        this.$el.on('click', '.drawing-board-control-navigation-reset', $.proxy(function(e) {
                                this.board.reset({ background: true });
                                e.preventDefault();
                        }, this));
                }
        },

        updateBack: function($back) {
                if (this.board.history.canUndo()) {
                        $back.removeAttr('disabled');
                } else {
                        $back.attr('disabled', 'disabled');
                }
        },

        updateForward: function($forward) {
                if (this.board.history.canRedo()) {
                        $forward.removeAttr('disabled');
                } else {
                        $forward.attr('disabled', 'disabled');
                }
        }
});

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