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gaia/apps/settings/js/panels/display/display.js

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+/**
+ * Handle display panel functionality, which will change the value of
+ * screen.automatic-brightness of settings.
+ *
+ * @module display/display
+ */
+define(function(require) {
+  'use strict';
+
+  var SettingsListener = require('shared/settings_listener');
+  var SliderHandler = require('panels/display/slider_handler');
+
+  const AUTO_BRIGHTNESS_SETTING = 'screen.automatic-brightness';
+  const SCREEN_BRIGHTNESS = 'screen.brightness';
+  /**
+   * @alias module:display/display
+   * @class Display
+   * @returns {Display}
+   */
+  var Display = function() {
+    this.elements = null;
+  };
+
+  Display.prototype = {
+    /**
+     * Init Display module with doms and data of device-features.json.
+     *
+     * @access public
+     * @memberOf Display.prototype
+     * @param {HTMLElement} elements
+     * @param {Object} data
+     *                 content of resources/device-features.json.
+     */
+    init: function d_init(elements, data) {
+      this.elements = elements;
+      this.initBrightnessItems(data);
+      SliderHandler().init(
+        elements.brightnessManualInput,
+        SCREEN_BRIGHTNESS);
+    },
+
+    /**
+     * Decide whether to show brightnessAuto and brightnessManual options.
+     *
+     * @access public
+     * @memberOf Display.prototype
+     * @param {Object} data
+     *                 content of resources/device-features.json.
+     */
+    initBrightnessItems: function d_init_brightness_items(data) {
+      var brightnessAuto = this.elements.brightnessAuto;
+      var brightnessAutoCheckbox = this.elements.brightnessAutoCheckbox;
+      var brightnessManual = this.elements.brightnessManual;
+      var brightnessManualInput = this.elements.brightnessManualInput;
+
+      if (data.ambientLight) {
+        brightnessAuto.hidden = false;
+        // Observe auto brightness setting
+        SettingsListener.observe(AUTO_BRIGHTNESS_SETTING, false,
+          function(value) {
+            brightnessAutoCheckbox.checked = value;
+            brightnessManual.hidden = value;
+          }.bind(this));
+      } else {
+        brightnessAuto.hidden = true;
+        brightnessManual.hidden = false;
+        var cset = {};
+        cset[AUTO_BRIGHTNESS_SETTING] = false;
+        SettingsListener.getSettingsLock().set(cset);
+      }
+      // Observe screen brightness setting
+      SettingsListener.observe(SCREEN_BRIGHTNESS, 0.5, function(value) {
+        brightnessManualInput.value = value;
+      }.bind(this));
+    }
+  };
+
+  return function ctor_display() {
+    return new Display();
+  };
+});