Remove TOUCH_UI specific new tab page.

chrome/browser/resources/touch_ntp/slider.js

-// Copyright (c) 2011 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 Card slider implementation. Allows you to create interactions
- * that have items that can slide left to right to reveal additional items.
- * Works by adding the necessary event handlers to a specific DOM structure
- * including a frame, container and cards.
- * - The frame defines the boundary of one item. Each card will be expanded to
- *   fill the width of the frame. This element is also overflow hidden so that
- *   the additional items left / right do not trigger horizontal scrolling.
- * - The container is what all the touch events are attached to. This element
- *   will be expanded to be the width of all cards.
- * - The cards are the individual viewable items. There should be one card for
- *   each item in the list. Only one card will be visible at a time. Two cards
- *   will be visible while you are transitioning between cards.
- *
- * This class is designed to work well on any hardware-accelerated touch device.
- * It should still work on pre-hardware accelerated devices it just won't feel
- * very good. It should also work well with a mouse.
- */
-
-
-// Use an anonymous function to enable strict mode just for this file (which
-// will be concatenated with other files when embedded in Chrome
-var Slider = (function() {
-  'use strict';
-
-  /**
-   * @constructor
-   * @param {!Element} frame The bounding rectangle that cards are visible in.
-   * @param {!Element} container The surrounding element that will have event
-   *     listeners attached to it.
-   * @param {!Array.<!Element>} cards The individual viewable cards.
-   * @param {number} currentCard The index of the card that is currently
-   *     visible.
-   * @param {number} cardWidth The width of each card should have.
-   */
-  function Slider(frame, container, cards, currentCard, cardWidth) {
-    /**
-     * @type {!Element}
-     * @private
-     */
-    this.frame_ = frame;
-
-    /**
-     * @type {!Element}
-     * @private
-     */
-    this.container_ = container;
-
-    /**
-     * @type {!Array.<!Element>}
-     * @private
-     */
-    this.cards_ = cards;
-
-    /**
-     * @type {number}
-     * @private
-     */
-    this.currentCard_ = currentCard;
-
-    /**
-     * @type {number}
-     * @private
-     */
-    this.cardWidth_ = cardWidth;
-
-    /**
-     * @type {!TouchHandler}
-     * @private
-     */
-    this.touchHandler_ = new TouchHandler(this.container_);
-  }
-
-
-  /**
-   * Events fired by the slider.
-   * Events are fired at the container.
-   */
-  Slider.EventType = {
-    // Fired when the user slides to another card.
-    CARD_CHANGED: 'slider:card_changed'
-  };
-
-
-  /**
-   * The time to transition between cards when animating. Measured in ms.
-   * @type {number}
-   * @private
-   * @const
-   */
-  Slider.TRANSITION_TIME_ = 200;
-
-
-  /**
-   * The minimum velocity required to transition cards if they did not drag past
-   * the halfway point between cards. Measured in pixels / ms.
-   * @type {number}
-   * @private
-   * @const
-   */
-  Slider.TRANSITION_VELOCITY_THRESHOLD_ = 0.2;
-
-
-  Slider.prototype = {
-    /**
-     * The current left offset of the container relative to the frame.
-     * @type {number}
-     * @private
-     */
-    currentLeft_: 0,
-
-    /**
-     * Initialize all elements and event handlers. Must call after construction
-     * and before usage.
-     */
-    initialize: function() {
-      var view = this.container_.ownerDocument.defaultView;
-      assert(view.getComputedStyle(this.container_).display == '-webkit-box',
-          'Container should be display -webkit-box.');
-      assert(view.getComputedStyle(this.frame_).overflow == 'hidden',
-          'Frame should be overflow hidden.');
-      assert(view.getComputedStyle(this.container_).position == 'static',
-          'Container should be position static.');
-      for (var i = 0, card; card = this.cards_[i]; i++) {
-        assert(view.getComputedStyle(card).position == 'static',
-            'Cards should be position static.');
-      }
-
-      this.updateCardWidths_();
-      this.transformToCurrentCard_();
-
-      this.container_.addEventListener(TouchHandler.EventType.TOUCH_START,
-                                       this.onTouchStart_.bind(this));
-      this.container_.addEventListener(TouchHandler.EventType.DRAG_START,
-                                       this.onDragStart_.bind(this));
-      this.container_.addEventListener(TouchHandler.EventType.DRAG_MOVE,
-                                       this.onDragMove_.bind(this));
-      this.container_.addEventListener(TouchHandler.EventType.DRAG_END,
-                                       this.onDragEnd_.bind(this));
-
-      this.touchHandler_.enable(/* opt_capture */ false);
-    },
-
-    /**
-     * Use in cases where the width of the frame has changed in order to update
-     * the width of cards. For example should be used when orientation changes
-     * in full width sliders.
-     * @param {number} newCardWidth Width all cards should have, in pixels.
-     */
-    resize: function(newCardWidth) {
-      if (newCardWidth != this.cardWidth_) {
-        this.cardWidth_ = newCardWidth;
-
-        this.updateCardWidths_();
-
-        // Must upate the transform on the container to show the correct card.
-        this.transformToCurrentCard_();
-      }
-    },
-
-    /**
-     * Sets the cards used. Can be called more than once to switch card sets.
-     * @param {!Array.<!Element>} cards The individual viewable cards.
-     * @param {number} index Index of the card to in the new set of cards to
-     *     navigate to.
-     */
-    setCards: function(cards, index) {
-      assert(index >= 0 && index < cards.length,
-          'Invalid index in Slider#setCards');
-      this.cards_ = cards;
-
-      this.updateCardWidths_();
-
-      // Jump to the given card index.
-      this.selectCard(index);
-    },
-
-    /**
-     * Updates the width of each card.
-     * @private
-     */
-    updateCardWidths_: function() {
-      for (var i = 0, card; card = this.cards_[i]; i++)
-        card.style.width = this.cardWidth_ + 'px';
-    },
-
-    /**
-     * Returns the index of the current card.
-     * @return {number} index of the current card.
-     */
-    get currentCard() {
-      return this.currentCard_;
-    },
-
-    /**
-     * Clear any transition that is in progress and enable dragging for the
-     * touch.
-     * @param {!TouchHandler.Event} e The TouchHandler event.
-     * @private
-     */
-    onTouchStart_: function(e) {
-      this.container_.style.WebkitTransition = '';
-      e.enableDrag = true;
-    },
-
-
-    /**
-     * Tell the TouchHandler that dragging is acceptable when the user begins by
-     * scrolling horizontally.
-     * @param {!TouchHandler.Event} e The TouchHandler event.
-     * @private
-     */
-    onDragStart_: function(e) {
-      e.enableDrag = Math.abs(e.dragDeltaX) > Math.abs(e.dragDeltaY);
-    },
-
-    /**
-     * On each drag move event reposition the container appropriately so the
-     * cards look like they are sliding.
-     * @param {!TouchHandler.Event} e The TouchHandler event.
-     * @private
-     */
-    onDragMove_: function(e) {
-      var deltaX = e.dragDeltaX;
-      // If dragging beyond the first or last card then apply a backoff so the
-      // dragging feels stickier than usual.
-      if (!this.currentCard && deltaX > 0 ||
-          this.currentCard == (this.cards_.length - 1) && deltaX < 0) {
-        deltaX /= 2;
-      }
-      this.translateTo_(this.currentLeft_ + deltaX);
-    },
-
-    /**
-     * Moves the view to the specified position.
-     * @param {number} x Horizontal position to move to.
-     * @private
-     */
-    translateTo_: function(x) {
-      // We use a webkitTransform to slide because this is GPU accelerated on
-      // Chrome and iOS.  Once Chrome does GPU acceleration on the position
-      // fixed-layout elements we could simply set the element's position to
-      // fixed and modify 'left' instead.
-      this.container_.style.WebkitTransform = 'translate3d(' + x + 'px, 0, 0)';
-    },
-
-    /**
-     * On drag end events we may want to transition to another card, depending
-     * on the ending position of the drag and the velocity of the drag.
-     * @param {!TouchHandler.Event} e The TouchHandler event.
-     * @private
-     */
-    onDragEnd_: function(e) {
-      var deltaX = e.dragDeltaX;
-      var velocity = this.touchHandler_.getEndVelocity().x;
-      var newX = this.currentLeft_ + deltaX;
-      var newCardIndex = Math.round(-newX / this.cardWidth_);
-
-      if (newCardIndex == this.currentCard && Math.abs(velocity) >
-          Slider.TRANSITION_VELOCITY_THRESHOLD_) {
-        // If the drag wasn't far enough to change cards but the velocity was
-        // high enough to transition anyways. If the velocity is to the left
-        // (negative) then the user wishes to go right (card +1).
-        newCardIndex += velocity > 0 ? -1 : 1;
-      }
-
-      this.selectCard(newCardIndex, /* animate */ true);
-    },
-
-    /**
-     * Cancel any current touch/slide as if we saw a touch end
-     */
-    cancelTouch: function() {
-      // Stop listening to any current touch
-      this.touchHandler_.cancelTouch();
-
-      // Ensure we're at a card bounary
-      this.transformToCurrentCard_(true);
-    },
-
-    /**
-     * Selects a new card, ensuring that it is a valid index, transforming the
-     * view and possibly calling the change card callback.
-     * @param {number} newCardIndex Index of card to show.
-     * @param {boolean=} opt_animate If true will animate transition from
-     *     current position to new position.
-     */
-    selectCard: function(newCardIndex, opt_animate) {
-      var isChangingCard = newCardIndex >= 0 &&
-          newCardIndex < this.cards_.length &&
-          newCardIndex != this.currentCard;
-      if (isChangingCard) {
-        // If we have a new card index and it is valid then update the left
-        // position and current card index.
-        this.currentCard_ = newCardIndex;
-      }
-
-      this.transformToCurrentCard_(opt_animate);
-
-      if (isChangingCard) {
-        var event = document.createEvent('Event');
-        event.initEvent(Slider.EventType.CARD_CHANGED, true, true);
-        event.slider = this;
-        this.container_.dispatchEvent(event);
-      }
-    },
-
-    /**
-     * Centers the view on the card denoted by this.currentCard. Can either
-     * animate to that card or snap to it.
-     * @param {boolean=} opt_animate If true will animate transition from
-     *     current position to new position.
-     * @private
-     */
-    transformToCurrentCard_: function(opt_animate) {
-      this.currentLeft_ = -this.currentCard * this.cardWidth_;
-
-      // Animate to the current card, which will either transition if the
-      // current card is new, or reset the existing card if we didn't drag
-      // enough to change cards.
-      var transition = '';
-      if (opt_animate) {
-        transition = '-webkit-transform ' + Slider.TRANSITION_TIME_ +
-                     'ms ease-in-out';
-      }
-      this.container_.style.WebkitTransition = transition;
-      this.translateTo_(this.currentLeft_);
-    }
-  };
-
-  return Slider;
-})();