Add third_party/google-input-tools: Take 2

third_party/google_input_tools/src/chrome/os/inputview/statemanager.js

+// Copyright 2014 The ChromeOS IME Authors. All Rights Reserved.
+// limitations under the License.
+// See the License for the specific language governing permissions and
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// Unless required by applicable law or agreed to in writing, software
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// You may obtain a copy of the License at
+// you may not use this file except in compliance with the License.
+// Licensed under the Apache License, Version 2.0 (the "License");
+//
+goog.provide('i18n.input.chrome.inputview.StateManager');
+
+goog.require('i18n.input.chrome.inputview.Covariance');
+
+
+/**
+ * The state for the input view keyboard.
+ *
+ * @constructor
+ */
+i18n.input.chrome.inputview.StateManager = function() {
+  /**
+   * The state of the keyboard.
+   *
+   * @type {number}
+   * @private
+   */
+  this.state_ = 0;
+
+  /**
+   * The sticky state.
+   *
+   * @type {number}
+   * @private
+   */
+  this.sticky_ = 0;
+
+  /**
+   * Bits to indicate which state key is down.
+   *
+   * @type {number}
+   * @private
+   */
+  this.stateKeyDown_ = 0;
+
+  /**
+   * Bits to track which state is in chording.
+   *
+   * @type {number}
+   * @private
+   */
+  this.chording_ = 0;
+
+  /**
+   * Whether the current keyset is in English mode.
+   *
+   * @type {boolean}
+   */
+  this.isEnMode = false;
+
+  /** @type {!i18n.input.chrome.inputview.Covariance} */
+  this.covariance = new i18n.input.chrome.inputview.Covariance();
+};
+
+
+/**
+ * Sets a state to keydown.
+ *
+ * @param {!i18n.input.chrome.inputview.StateType} stateType The state type.
+ * @param {boolean} isKeyDown True if the state key is down.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.setKeyDown = function(
+    stateType, isKeyDown) {
+  if (isKeyDown) {
+    this.stateKeyDown_ |= stateType;
+  } else {
+    this.stateKeyDown_ &= ~stateType;
+    this.chording_ &= ~stateType;
+  }
+};
+
+
+/**
+ * True if the key is down.
+ *
+ * @param {!i18n.input.chrome.inputview.StateType} stateType .
+ * @return {boolean} .
+ */
+i18n.input.chrome.inputview.StateManager.prototype.isKeyDown = function(
+    stateType) {
+  return (this.stateKeyDown_ & stateType) != 0;
+};
+
+
+/**
+ * Triggers chording and record it for each key-downed state.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.triggerChording =
+    function() {
+  this.chording_ |= this.stateKeyDown_;
+};
+
+
+/**
+ * True if the state is chording now.
+ *
+ * @param {!i18n.input.chrome.inputview.StateType} stateType The state type.
+ * @return {boolean} True if the state is chording.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.isChording = function(
+    stateType) {
+  return (this.chording_ & stateType) != 0;
+};
+
+
+/**
+ * Sets a state to be sticky.
+ *
+ * @param {!i18n.input.chrome.inputview.StateType} stateType The state type.
+ * @param {boolean} isSticky True to set it sticky.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.setSticky = function(
+    stateType, isSticky) {
+  if (isSticky) {
+    this.sticky_ |= stateType;
+  } else {
+    this.sticky_ &= ~stateType;
+  }
+};
+
+
+/**
+ * Is a state sticky.
+ *
+ * @param {!i18n.input.chrome.inputview.StateType} stateType The state
+ *     type.
+ * @return {boolean} True if it is sticky.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.isSticky = function(
+    stateType) {
+  return (this.sticky_ & stateType) != 0;
+};
+
+
+/**
+ * Sets a state.
+ *
+ * @param {!i18n.input.chrome.inputview.StateType} stateType The state
+ *     type.
+ * @param {boolean} enable True to enable the state.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.setState = function(
+    stateType, enable) {
+  if (enable) {
+    this.state_ = this.state_ | stateType;
+  } else {
+    this.state_ = this.state_ & ~stateType;
+  }
+};
+
+
+/**
+ * Toggle the state.
+ *
+ * @param {!i18n.input.chrome.inputview.StateType} stateType The state
+ *     type.
+ * @param {boolean} isSticky True to set it sticky.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.toggleState = function(
+    stateType, isSticky) {
+  var enable = !this.hasState(stateType);
+  this.setState(stateType, enable);
+  isSticky = enable ? isSticky : false;
+  this.setSticky(stateType, isSticky);
+};
+
+
+/**
+ * Is the state on.
+ *
+ * @param {!i18n.input.chrome.inputview.StateType} stateType The state
+ *     type.
+ * @return {boolean} True if the state is on.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.hasState = function(
+    stateType) {
+  return (this.state_ & stateType) != 0;
+};
+
+
+/**
+ * Gets the state.
+ *
+ * @return {number} The state.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.getState =
+    function() {
+  return this.state_;
+};
+
+
+/**
+ * Clears unsticky state.
+ *
+ */
+i18n.input.chrome.inputview.StateManager.prototype.clearUnstickyState =
+    function() {
+  this.state_ = this.state_ & this.sticky_;
+};
+
+
+/**
+ * True if there is unsticky state.
+ *
+ * @return {boolean} True if there is unsticky state.
+ */
+i18n.input.chrome.inputview.StateManager.prototype.hasUnStickyState =
+    function() {
+  return this.state_ != this.sticky_;
+};
+
+
+/**
+ * Resets the state.
+ *
+ */
+i18n.input.chrome.inputview.StateManager.prototype.reset = function() {
+  this.state_ = 0;
+  this.sticky_ = 0;
+};