Rework quick unlock settings to follow new specs.

chrome/browser/resources/settings/people_page/lock_screen.js

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview
+ * 'settings-lock-screen' allows the user to change how they unlock their
+ * device.
+ *
+ * Example:
+ *
+ * <settings-lock-screen
+ *   prefs="{{prefs}}">
+ * </settings-lock-screen>
+ */
+
+Polymer({
+  is: 'settings-lock-screen',
+
+  behaviors: [I18nBehavior, LockStateBehavior, settings.RouteObserverBehavior],
+
+  properties: {
+    /** Preferences state. */
+    prefs: {
+      type: Object
+    },
+
+    /**
+     * setModes_ is a partially applied function that stores the previously
+     * entered password. It's defined only when the user has already entered a
+     * valid password.
+     *
+     * @type {Object|undefined}
+     * @private
+     */
+    setModes_: {
+      type: Object,
+      observer: 'onSetModesChanged_'
+    },
+  },
+
+  /** selectedUnlockType is defined in LockStateBehavior. */
+  observers: ['selectedUnlockTypeChanged_(selectedUnlockType)'],
+
+  /** @override */
+  attached: function() {
+    // currentRouteChanged is not called during the initial navigation. If the
+    // user navigates directly to the lockScreen page, we still want to show the
+    // password prompt page.
+    this.currentRouteChanged();
+  },
+
+  /**
+   * Overridden from settings.RouteObserverBehavior.
+   * @protected
+   */
+  currentRouteChanged: function() {
+    if (settings.getCurrentRoute() == settings.Route.LOCK_SCREEN &&
+        !this.setModes_) {
+      this.$.passwordPrompt.open();
+    } else {
+      // If the user navigated away from the lock screen settings page they will
+      // have to re-enter their password.
+      this.setModes_ = undefined;
+    }
+  },
+
+  /**
+   * Called when the unlock type has changed.
+   * @param {!string} selected The current unlock type.
+   * @private
+   */
+  selectedUnlockTypeChanged_: function(selected) {
+    if (selected == LockScreenUnlockType.VALUE_PENDING)
+      return;
+
+    if (selected != LockScreenUnlockType.PIN_PASSWORD && this.setModes_) {
+      this.setModes_.call(null, [], [], function(didSet) {
+        assert(didSet, 'Failed to clear quick unlock modes');
+      });
+    }
+  },
+
+  /** @private */
+  onSetModesChanged_: function() {
+    if (settings.getCurrentRoute() == settings.Route.LOCK_SCREEN &&
+        !this.setModes_) {
+      this.$.setupPin.close();
+      this.$.passwordPrompt.open();
+    }
+  },
+
+  /** @private */
+  onPasswordClosed_: function() {
+    if (!this.setModes_)
+      settings.navigateTo(settings.Route.PEOPLE);
+  },
+
+  /** @private */
+  onPinSetupDone_: function() {
+    this.$.setupPin.close();
+  },
+
+  /**
+   * Returns true if the setup pin section should be shown.
+   * @param {!string} selectedUnlockType The current unlock type. Used to let
+   *     Polymer know about the dependency.
+   * @private
+   */
+  showConfigurePinButton_: function(selectedUnlockType) {
+    return selectedUnlockType === LockScreenUnlockType.PIN_PASSWORD;
+  },
+
+  /** @private */
+  getSetupPinText_: function() {
+    if (this.hasPin)
+      return this.i18n('lockScreenChangePinButton');
+    return this.i18n('lockScreenSetupPinButton');
+  },
+
+  /** @private */
+  onConfigurePin_: function() {
+    this.$.setupPin.open();
+  },
+});