VulpesOS/assets/webapps/camera.gaiamobile.org/js/controllers/zoom-bar.js

define([
    'require',
    'exports',
    'module',
    'debug',
    'views/zoom-bar',
    'lib/bind-all'
], function (require, exports, module) {
    'use strict';
    var debug = require('debug')('controller:zoom-bar');
    var ZoomBar = require('views/zoom-bar');
    var bindAll = require('lib/bind-all');
    module.exports = function (app) {
        return new ZoomBarController(app);
    };
    module.exports.ZoomBarController = ZoomBarController;
    function ZoomBarController(app) {
        bindAll(this);
        this.app = app;
        this.camera = app.camera;
        this.createView();
        this.bindEvents();
        this.configureZoomBar();
        debug('initialized');
    }
    ZoomBarController.prototype.createView = function () {
        this.view = this.app.views.zoombar || new ZoomBar();
        this.view.hide();
        this.view.appendTo(this.app.el);
    };
    ZoomBarController.prototype.bindEvents = function () {
        this.view.on('change', this.onChange);
        this.camera.on('zoomconfigured', this.onZoomConfigured);
        this.camera.on('zoomchanged', this.setZoom);
    };
    ZoomBarController.prototype.configureZoomBar = function () {
        var zoomSupported = this.camera.isZoomSupported();
        var zoomEnabled = this.app.settings.zoom.enabled();
        this.enableZoom = zoomSupported && zoomEnabled;
    };
    ZoomBarController.prototype.onChange = function (value) {
        var minimumZoom = this.camera.getMinimumZoom();
        var maximumZoom = this.camera.getMaximumZoom();
        var range = maximumZoom - minimumZoom;
        var zoom = range * value / 100 + minimumZoom;
        this.camera.setZoom(zoom);
    };
    ZoomBarController.prototype.onZoomConfigured = function (zoom) {
        this.configureZoomBar();
        this.setZoom(zoom);
        this.view.hide();
    };
    ZoomBarController.prototype.setZoom = function (zoom) {
        if (!this.enableZoom) {
            return;
        }
        debug('set zoom');
        var minimumZoom = this.camera.getMinimumZoom();
        var maximumZoom = this.camera.getMaximumZoom();
        var range = maximumZoom - minimumZoom;
        var percent = (zoom - minimumZoom) / range * 100;
        this.view.setValue(percent);
        debug('zoom set');
    };
});