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assets/webapps/system.gaiamobile.org/js/power_save.js

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+'use strict';
+/* global MozActivity, NotificationHelper, SettingsListener */
+
+(function(exports) {
+
+  function PowerSave(batteryOverlay) {
+    this.batteryOverlay = batteryOverlay;
+  }
+
+  PowerSave.prototype = {
+    _powerSaveResume: {},
+
+    _powerSaveEnabled: false,
+
+    _states: {
+      'wifi.enabled': false,
+      'ril.data.enabled': false,
+      'bluetooth.enabled': false,
+      'geolocation.enabled': false
+    },
+
+    _powerSaveEnabledLock: false,
+
+    start: function() {
+      SettingsListener.observe('powersave.enabled', false, value => {
+        var enabled = value;
+        if (enabled) {
+          this.enablePowerSave();
+        } else {
+          this.disablePowerSave();
+        }
+        this._powerSaveEnabled = enabled;
+      });
+
+      SettingsListener.observe('powersave.threshold', -1, value => {
+        this.doCheckThreshold(value);
+      });
+
+      function getState(state, value) {
+        /* jshint validthis: true */
+        this._states[state] = value;
+      }
+
+      // Monitor the states of various modules
+      for (var j in this._states) {
+        SettingsListener.observe(j, true, getState.bind(this, j));
+      }
+    },
+
+    // XXX Break down obj keys in a for each loop because mozSettings
+    // does not currently supports multiple keys in one set()
+    // https://bugzilla.mozilla.org/show_bug.cgi?id=779381
+    setMozSettings: function(keypairs) {
+      var setlock = SettingsListener.getSettingsLock();
+      for (var key in keypairs) {
+        // not set bluetooth key because we'll handle it separately
+        // for API compatibility
+        if ('bluetooth.enabled' !== key) {
+          var obj = {};
+          obj[key] = keypairs[key];
+          setlock.set(obj);
+        }
+      }
+    },
+
+    enablePowerSave: function() {
+      // Keep the original states of various modules
+      for (var j in this._states) {
+        this._powerSaveResume[j] = this._states[j];
+      }
+
+      var settingsToSet = {
+        // Turn off Wifi
+        'wifi.enabled': false,
+        // Turn off Data
+        'ril.data.enabled': false,
+        // Turn off Geolocation
+        'geolocation.enabled': false
+      };
+
+      this.setMozSettings(settingsToSet);
+      // Turn off Bluetooth
+      window.dispatchEvent(new CustomEvent('request-disable-bluetooth'));
+
+      this._powerSaveEnabledLock = false;
+    },
+
+    disablePowerSave: function() {
+      var settingsToSet = {};
+
+      for (var state in this._powerSaveResume) {
+        if (this._powerSaveResume[state] === true) {
+          settingsToSet[state] = true;
+        }
+      }
+      if (this._powerSaveResume['bluetooth.enabled'] === true) {
+        // Turn on Bluetooth
+        window.dispatchEvent(new CustomEvent('request-enable-bluetooth'));
+      }
+
+      this.setMozSettings(settingsToSet);
+    },
+
+    showPowerSavingNotification: function() {
+      var clickCB = function() {
+        var activityRequest = new MozActivity({
+          name: 'configure',
+          data: {
+            target: 'device',
+            section: 'battery'
+          }
+        });
+        activityRequest.onsuccess = () => {};
+      };
+
+      NotificationHelper.send('notification-powersaving-mode-on-title', {
+        'bodyL10n': 'notification-powersaving-mode-on-description',
+        'icon': 'style/icons/Power_saving_mode.png',
+        'mozbehavior': {
+          showOnlyOnce: true
+        }
+      }).then(function(notification) {
+        notification.addEventListener('click', clickCB);
+      });
+    },
+
+    checkThreshold: function() {
+      var key = 'powersave.threshold';
+      var lock = navigator.mozSettings.createLock();
+      var req = lock.get(key);
+      req.onerror = function(e) {
+        console.error('Error while quering setting ' + key + ': ' + e);
+      };
+
+      req.onsuccess = (function() {
+        this.doCheckThreshold(req.result[key] || -1);
+      }).bind(this);
+    },
+
+    doCheckThreshold: function(value) {
+      var battery = this.batteryOverlay._battery;
+
+      // If 'turn on automatically' is set to 'never', don't change the
+      // power saving state
+      if (value == -1) {
+        return;
+      }
+
+      if (battery.level <= value && !this._powerSaveEnabled) {
+        this.setMozSettings({
+          'powersave.enabled': true
+        });
+        if (!this._powerSaveEnabledLock) {
+          this.showPowerSavingNotification();
+          this._powerSaveEnabledLock = true;
+        }
+        return;
+      }
+
+      if (battery.level > value && this._powerSaveEnabled) {
+        this.setMozSettings({
+          'powersave.enabled': false
+        });
+        return;
+      }
+    },
+
+    onBatteryChange: function() {
+      var battery = this.batteryOverlay._battery;
+
+      if (battery.charging) {
+        if (this._powerSaveEnabled) {
+          this.setMozSettings({
+            'powersave.enabled': false
+          });
+        }
+
+        return;
+      }
+
+      this.checkThreshold();
+    }
+  };
+
+  exports.PowerSave = PowerSave;
+
+}(window));