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gaia/apps/camera/js/controllers/zoom-bar.js

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+define(function(require, exports, module) {
+'use strict';
+
+/**
+ * Dependencies
+ */
+
+var debug = require('debug')('controller:zoom-bar');
+var ZoomBar = require('views/zoom-bar');
+var bindAll = require('lib/bind-all');
+
+/**
+ * Exports
+ */
+
+module.exports = function(app) { return new ZoomBarController(app); };
+module.exports.ZoomBarController = ZoomBarController;
+
+/**
+ * Initialize a new `ZoomBarController`
+ *
+ * @param {App} app
+ */
+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);
+
+  // TODO: Camera events should be relayed through
+  // the app, so that controllers dont' have a
+  // hard dependency on each other.
+  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');
+};
+
+});