text: // 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.elements.layout.ExtendedLayout');
  
  goog.require('goog.dom.classlist');
  goog.require('goog.style');
  goog.require('goog.style.transform');
  goog.require('i18n.input.chrome.ElementType');
  goog.require('i18n.input.chrome.inputview.Css');
  goog.require('i18n.input.chrome.inputview.elements.Element');
  goog.require('i18n.input.chrome.inputview.elements.Weightable');
  
  
  goog.scope(function() {
  var Css = i18n.input.chrome.inputview.Css;
  
  
  
  /**
   * The extended layout. Each of its children has the same width as its parent.
   * It can be wider than its parent.
   *
   * @param {string} id The id.
   * @param {goog.events.EventTarget=} opt_eventTarget The event target.
   * @param {i18n.input.chrome.inputview.Css=} opt_iconCssClass The css class.
   * @constructor
   * @extends {i18n.input.chrome.inputview.elements.Element}
   * @implements {i18n.input.chrome.inputview.elements.Weightable}
   */
  i18n.input.chrome.inputview.elements.layout.ExtendedLayout = function(id,
      opt_eventTarget, opt_iconCssClass) {
    goog.base(this, id, i18n.input.chrome.ElementType.
        EXTENDED_LAYOUT, opt_eventTarget);
  
    /**
     * The icon Css class for the extendedlayout.
     *
     * @type {i18n.input.chrome.inputview.Css}
     */
    this.iconCssClass = Css.LINEAR_LAYOUT;
  };
  goog.inherits(i18n.input.chrome.inputview.elements.layout.ExtendedLayout,
      i18n.input.chrome.inputview.elements.Element);
  var ExtendedLayout = i18n.input.chrome.inputview.elements.layout.ExtendedLayout;
  
  
  /**
   * The height in weight unit.
   *
   * @type {number}
   * @private
   */
  ExtendedLayout.prototype.heightInWeight_ = 0;
  
  
  /**
   * The width in weight unit.
   *
   * @type {number}
   * @private
   */
  ExtendedLayout.prototype.widthInWeight_ = 0;
  
  
  /**
   * The current X (horizontal) position of the layout.
   *
   * @type {number}
   * @private
   */
  ExtendedLayout.prototype.xPosition_ = 0;
  
  
  /**
   * The time of transition for every transition distance.
   *
   * @private {number}
   */
  ExtendedLayout.BASE_TRANSITION_DURATION_ = 0.2;
  
  
  /**
   * The transition distance used to calculate transition time.
   *
   * @private {number}
   */
  ExtendedLayout.BASE_TRANSITION_DISTANCE_ = 100;
  
  
  /** @override */
  ExtendedLayout.prototype.getHeightInWeight = function() {
    return this.heightInWeight_;
  };
  
  
  /** @override */
  ExtendedLayout.prototype.getWidthInWeight = function() {
    return this.widthInWeight_;
  };
  
  
  /** @override */
  ExtendedLayout.prototype.createDom = function() {
    goog.base(this, 'createDom');
    this.elem = this.getElement();
    goog.dom.classlist.addAll(this.elem,
        [this.iconCssClass, Css.EMOJI_FONT]);
  };
  
  
  /** @override */
  ExtendedLayout.prototype.enterDocument = function() {
    goog.base(this, 'enterDocument');
    this.calculate_();
  };
  
  
  /** @override */
  ExtendedLayout.prototype.resize = function(width, height) {
    if (width == this.width && height == this.height) {
      return;
    }
    for (var i = 0, len = this.getChildCount(); i < len; i++) {
      var child =  /** @type {i18n.input.chrome.inputview.elements.Element} */ (
          this.getChildAt(i));
      child.resize(width, height);
    }
    this.getElement().style.width = width * this.getChildCount() + 'px';
    goog.base(this, 'resize', width * this.getChildCount(), height);
  };
  
  
  /**
   * Calculate the height and weight。
   *
   * @private
   */
  ExtendedLayout.prototype.calculate_ = function() {
    for (var i = 0; i < this.getChildCount(); i++) {
      var child = /** @type {i18n.input.chrome.inputview.elements.Weightable} */ (
          this.getChildAt(i));
      if (this.heightInWeight_ < child.getHeightInWeight()) {
        this.heightInWeight_ = child.getHeightInWeight();
      }
      this.widthInWeight_ = child.getWidthInWeight();
    }
  };
  
  
  /**
   * Switch to a page of the emojiSlider.
   *
   * @param {number} pageNum The page to switch to.
   */
  ExtendedLayout.prototype.gotoPage = function(pageNum) {
    var width = goog.style.getSize(this.getElement()).width;
    var childNum = this.getChildCount();
    this.xPosition_ = 0 - width / childNum * pageNum;
    goog.style.transform.setTranslation(this.elem, this.xPosition_, 0);
  };
  
  
  /**
   * Slide to a position.
   *
   * @param {number} deltaX The slide distance of x-coordinate.
   */
  ExtendedLayout.prototype.slide = function(deltaX) {
    this.elem.style.transition = '';
    this.xPosition_ += deltaX;
    goog.style.transform.setTranslation(this.elem, this.xPosition_, 0);
  };
  
  
  /**
   * Adjust the the horizontal position of the layout to align with a page.
   *
   * @param {number=} opt_distance The distance to adjust to.
   * @return {number} The page to adjust to after calculation.
   */
  ExtendedLayout.prototype.adjustXPosition = function(opt_distance) {
    var childNum = this.getChildCount();
    var width = goog.style.getSize(this.elem).width / childNum;
    var absXPosition = Math.abs(this.xPosition_);
    var prev = Math.floor(absXPosition / width);
    var next = prev + 1;
    var pageNum = 0;
    if (opt_distance) {
      if (opt_distance >= 0) {
        pageNum = prev;
      } else {
        pageNum = next;
      }
    } else if (absXPosition - prev * width < next * width - absXPosition) {
      pageNum = prev;
    } else {
      pageNum = next;
    }
    if (pageNum < 0) {
      pageNum = 0;
    } else if (pageNum >= childNum) {
      pageNum = childNum - 1;
    }
    if (opt_distance) {
      this.elem.style.transition = 'transform ' +
          ExtendedLayout.BASE_TRANSITION_DURATION_ + 's';
    } else {
      var transitionDuration = Math.abs(absXPosition - pageNum * width) /
          ExtendedLayout.BASE_TRANSITION_DISTANCE_ *
          ExtendedLayout.BASE_TRANSITION_DURATION_;
      this.elem.style.transition = 'transform ' +
          transitionDuration + 's ease-in';
    }
    this.gotoPage(pageNum);
    return pageNum;
  };
  
  
  /**
   * Update the category.
   *
   * @param {number} pageNum The page number to switch to.
   */
  ExtendedLayout.prototype.updateCategory = function(pageNum) {
    this.elem.style.transition = '';
    this.gotoPage(pageNum);
  };
  });  // goog.scope
  