Remove dead code for system VK.

ui/keyboard/resources/elements/kb-shift-key.js

-// Copyright 2014 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.
-
-(function () {
-
-  /**
-   * The possible states of the shift key.
-   * Unlocked is the default state. Locked for capslocked, pressed is a
-   * key-down and tapped for a key-down followed by an immediate key-up.
-   * @const
-   * @type {Enum}
-   */
-  var KEY_STATES = {
-    PRESSED: "pressed", // Key-down on shift key.
-    LOCKED: "locked", // Key is capslocked.
-    UNLOCKED: "unlocked", // Default state.
-    TAPPED: "tapped", // Key-down followed by key-up.
-    CHORDING: "chording" // Key-down followed by other keys.
-  };
-
-  /**
-   * The pointerdown event on shiftkey that may eventually trigger chording
-   * state. pointerId and eventTarget are the two fields that is used now.
-   * @type {PointerEvent}
-   */
-  var enterChordingEvent = undefined;
-
-  /**
-   * Uses a closure to define one long press timer among all shift keys
-   * regardless of the layout they are in.
-   * @type {function}
-   */
-  var shiftLongPressTimer = undefined;
-
-  /**
-   * The current state of the shift key.
-   * @type {Enum}
-   */
-  var state = KEY_STATES.UNLOCKED;
-
-  Polymer('kb-shift-key', {
-    /**
-     * Defines how capslock effects keyset transition. We always transition
-     * from the lowerCaseKeysetId to the upperCaseKeysetId if capslock is
-     * on.
-     * @type {string}
-     */
-    lowerCaseKeysetId: 'lower',
-    upperCaseKeysetId: 'upper',
-
-    up: function(event) {
-      if (state == KEY_STATES.CHORDING &&
-          event.pointerId != enterChordingEvent.pointerId) {
-        // Disables all other pointer events on shift keys when chording.
-        return;
-      }
-      switch (state) {
-        case KEY_STATES.PRESSED:
-          state = KEY_STATES.TAPPED;
-          break;
-        case KEY_STATES.CHORDING:
-          // Leaves chording only if the pointer that triggered it is
-          // released.
-          state = KEY_STATES.UNLOCKED;
-          break;
-        default:
-          break;
-      }
-      // When releasing the shift key, it is not the same shift key that was
-      // pressed. Updates the pointerId of the releasing shift key to make
-      // sure key-up event fires correctly in kb-key-base.
-      this.pointerId = enterChordingEvent.pointerId;
-      this.super([event]);
-    },
-
-    out: function(event) {
-      // Sliding off the shift key while chording is treated as a key-up.
-      // Note that we switch to a new keyset on shift keydown, and a finger
-      // movement on the new shift key will trigger this function being
-      // called on the old shift key. We should not end chording in that
-      // case.
-      if (state == KEY_STATES.CHORDING &&
-          event.pointerId == enterChordingEvent.pointerId &&
-          event.target != enterChordingEvent.target) {
-        state = KEY_STATES.UNLOCKED;
-        var detail = this.populateDetails('out');
-        this.fire("key-out", detail);
-      }
-    },
-
-    down: function(event) {
-      // First transition state so that populateDetails generates
-      // correct data.
-      switch (state) {
-        case KEY_STATES.UNLOCKED:
-          state = KEY_STATES.PRESSED;
-          break;
-        case KEY_STATES.TAPPED:
-        case KEY_STATES.LOCKED:
-          state = KEY_STATES.UNLOCKED;
-          break;
-        case KEY_STATES.PRESSED:
-        case KEY_STATES.CHORDING:
-          // We pressed another shift key at the same time,
-          // so ignore second press.
-          return;
-        default:
-          console.error("Undefined shift key state: " + state);
-          break;
-      }
-      enterChordingEvent = event;
-      // Trigger parent behaviour.
-      this.super([event]);
-      this.fire('enable-sel');
-      // Populate double click transition details.
-      var detail = {};
-      detail.char = this.char || this.textContent;
-      detail.toKeyset = this.upperCaseKeysetId;
-      detail.nextKeyset = undefined;
-      detail.callback = this.onDoubleClick;
-      this.fire('enable-dbl', detail);
-    },
-
-    generateLongPressTimer: function() {
-      return this.async(function() {
-        var detail = this.populateDetails();
-        if (state == KEY_STATES.LOCKED) {
-          // We don't care about the longpress if we are already
-          // capitalized.
-          return;
-        } else {
-          state = KEY_STATES.LOCKED;
-          detail.toKeyset = this.upperCaseKeysetId;
-          detail.nextKeyset = undefined;
-        }
-        this.fire('key-longpress', detail);
-      }, null, LONGPRESS_DELAY_MSEC);
-    },
-
-    // @return Whether the shift modifier is currently active.
-    isActive: function() {
-      return state != KEY_STATES.UNLOCKED;
-    },
-
-    /**
-     * Callback function for when a double click is triggered.
-     */
-    onDoubleClick: function() {
-      state = KEY_STATES.LOCKED;
-    },
-
-    /**
-     * Notifies shift key that a non-control key was pressed down.
-     * A control key is defined as one of shift, control or alt.
-     */
-    onNonControlKeyDown: function() {
-      switch (state) {
-        case (KEY_STATES.PRESSED):
-          state = KEY_STATES.CHORDING;
-          // Disable longpress timer.
-          clearTimeout(shiftLongPressTimer);
-          break;
-        default:
-          break;
-      }
-    },
-
-    /**
-     * Notifies key that a non-control keyed was typed.
-     * A control key is defined as one of shift, control or alt.
-     */
-    onNonControlKeyTyped: function() {
-      if (state == KEY_STATES.TAPPED)
-        state = KEY_STATES.UNLOCKED;
-    },
-
-    /**
-     * Callback function for when a space is pressed after punctuation.
-     * @return {Object} The keyset transitions the keyboard should make.
-     */
-    onSpaceAfterPunctuation: function() {
-       var detail = {};
-       detail.toKeyset = this.upperCaseKeysetId;
-       detail.nextKeyset = this.lowerCaseKeysetId;
-       state = KEY_STATES.TAPPED;
-       return detail;
-    },
-
-    populateDetails: function(caller) {
-      var detail = this.super([caller]);
-      switch(state) {
-        case(KEY_STATES.LOCKED):
-          detail.toKeyset = this.upperCaseKeysetId;
-          break;
-        case(KEY_STATES.UNLOCKED):
-          detail.toKeyset = this.lowerCaseKeysetId;
-          break;
-        case(KEY_STATES.PRESSED):
-          detail.toKeyset = this.upperCaseKeysetId;
-          break;
-        case(KEY_STATES.TAPPED):
-          detail.toKeyset = this.upperCaseKeysetId;
-          detail.nextKeyset = this.lowerCaseKeysetId;
-          break;
-        case(KEY_STATES.CHORDING):
-          detail.toKeyset = this.lowerCaseKeysetId;
-          break;
-        default:
-          break;
-      }
-      return detail;
-    },
-
-    /**
-     *  Resets the shift key state.
-     */
-    reset: function() {
-      state = KEY_STATES.UNLOCKED;
-    },
-
-    /**
-     * Overrides longPressTimer for the shift key.
-     */
-    get longPressTimer() {
-      return shiftLongPressTimer;
-    },
-
-    set longPressTimer(timer) {
-      shiftLongPressTimer = timer;
-    },
-
-    get state() {
-      return state;
-    },
-
-    get textKeyset() {
-      switch (state) {
-        case KEY_STATES.UNLOCKED:
-          return this.lowerCaseKeysetId;
-        default:
-          return this.upperCaseKeysetId;
-      }
-    },
-  });
-})();