First pass on intents options UI.

chrome/browser/resources/options/intents_list.js

Index: chrome/browser/resources/options/intents_list.js
diff --git a/chrome/browser/resources/options/intents_list.js b/chrome/browser/resources/options/intents_list.js
new file mode 100644
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+++ b/chrome/browser/resources/options/intents_list.js
@@ -0,0 +1,715 @@
+// 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.
+
+// TODO(gbillock): refactor this together with CookiesList once we have
+// a better sense from UX design what it'll look like and so what'll be shared.
+cr.define('options', function() {
+  const DeletableItemList = options.DeletableItemList;
+  const DeletableItem = options.DeletableItem;
+  const ArrayDataModel = cr.ui.ArrayDataModel;
+  const ListSingleSelectionModel = cr.ui.ListSingleSelectionModel;
+  const localStrings = new LocalStrings();
+
+  /**
+   * Returns the item's height, like offsetHeight but such that it works better
+   * when the page is zoomed. See the similar calculation in @{code cr.ui.List}.
+   * This version also accounts for the animation done in this file.
+   * @param {Element} item The item to get the height of.
+   * @return {number} The height of the item, calculated with zooming in mind.
+   */
+  function getItemHeight(item) {
+    var height = item.style.height;
+    // Use the fixed animation target height if set, in case the element is
+    // currently being animated and we'd get an intermediate height below.
+    if (height && height.substr(-2) == 'px')
+      return parseInt(height.substr(0, height.length - 2));
+    return item.getBoundingClientRect().height;
+  }
+
+  // Map of parent pathIDs to node objects.
+  var parentLookup = {};
+
+  // Pending requests for child information.
+  var lookupRequests = {};
+
+  /**
+   * Creates a new list item for intent service data. Note that these are
+   * created and destroyed lazily as they scroll into and out of view,
+   * so they must be stateless. We cache the expanded item in
+   * @{code IntentsList} though, so it can keep state.
+   * (Mostly just which item is selected.)
+   *
+   * @param {Object} origin Data used to create an intents list item.
+   * @param {IntentsList} list The list that will contain this item.
+   * @constructor
+   * @extends {DeletableItem}
+   */
+  function IntentsListItem(origin, list) {
+    var listItem = new DeletableItem(null);
+    listItem.__proto__ = IntentsListItem.prototype;
+
+    listItem.origin = origin;
+    listItem.list = list;
+    listItem.decorate();
+
+    // This hooks up updateOrigin() to the list item, makes the top-level
+    // tree nodes (i.e., origins) register their IDs in parentLookup, and
+    // causes them to request their children if they have none. Note that we
+    // have special logic in the setter for the parent property to make sure
+    // that we can still garbage collect list items when they scroll out of
+    // view, even though it appears that we keep a direct reference.
+    if (origin) {
+      origin.parent = listItem;
+      origin.updateOrigin();
+    }
+
+    return listItem;
+  }
+
+  IntentsListItem.prototype = {
+    __proto__: DeletableItem.prototype,
+
+    /** @inheritDoc */
+    decorate: function() {
+      this.siteChild = this.ownerDocument.createElement('div');
+      this.siteChild.className = 'intents-site';
+      this.dataChild = this.ownerDocument.createElement('div');
+      this.dataChild.className = 'intents-data';
+      this.itemsChild = this.ownerDocument.createElement('div');
+      this.itemsChild.className = 'intents-items';
+      this.infoChild = this.ownerDocument.createElement('div');
+      this.infoChild.className = 'intents-details';
+      this.infoChild.hidden = true;
+      var remove = this.ownerDocument.createElement('button');
+      remove.textContent = localStrings.getString('removeIntent');
+      remove.onclick = this.removeIntent_.bind(this);
+      this.infoChild.appendChild(remove);
+      var content = this.contentElement;
+      content.appendChild(this.siteChild);
+      content.appendChild(this.dataChild);
+      content.appendChild(this.itemsChild);
+      this.itemsChild.appendChild(this.infoChild);
+      if (this.origin && this.origin.data) {
+        this.siteChild.textContent = this.origin.data.site;
+        this.siteChild.setAttribute('title', this.origin.data.site);
+      }
+      this.itemList_ = [];
+    },
+
+    /** @type {boolean} */
+    get expanded() {
+      return this.expanded_;
+    },
+    set expanded(expanded) {
+      if (this.expanded_ == expanded)
+        return;
+      this.expanded_ = expanded;
+      if (expanded) {
+        var oldExpanded = this.list.expandedItem;
+        this.list.expandedItem = this;
+        this.updateItems_();
+        if (oldExpanded)
+          oldExpanded.expanded = false;
+        this.classList.add('show-items');
+        this.dataChild.hidden = true;
+      } else {
+        if (this.list.expandedItem == this) {
+          this.list.leadItemHeight = 0;
+          this.list.expandedItem = null;
+        }
+        this.style.height = '';
+        this.itemsChild.style.height = '';
+        this.classList.remove('show-items');
+        this.dataChild.hidden = false;
+      }
+    },
+
+    /**
+     * The callback for the "remove" button shown when an item is selected.
+     * Requests that the currently selected intent service be removed.
+     * @private
+     */
+    removeIntent_: function() {
+      if (this.selectedIndex_ >= 0) {
+        var item = this.itemList_[this.selectedIndex_];
+        if (item && item.node)
+          chrome.send('removeIntent', [item.node.pathId]);
+      }
+    },
+
+    /**
+     * Disable animation within this intents list item, in preparation for
+     * making changes that will need to be animated. Makes it possible to
+     * measure the contents without displaying them, to set animation targets.
+     * @private
+     */
+    disableAnimation_: function() {
+      this.itemsHeight_ = getItemHeight(this.itemsChild);
+      this.classList.add('measure-items');
+    },
+
+    /**
+     * Enable animation after changing the contents of this intents list item.
+     * See @{code disableAnimation_}.
+     * @private
+     */
+    enableAnimation_: function() {
+      if (!this.classList.contains('measure-items'))
+        this.disableAnimation_();
+      this.itemsChild.style.height = '';
+      // This will force relayout in order to calculate the new heights.
+      var itemsHeight = getItemHeight(this.itemsChild);
+      var fixedHeight = getItemHeight(this) + itemsHeight - this.itemsHeight_;
+      this.itemsChild.style.height = this.itemsHeight_ + 'px';
+      // Force relayout before enabling animation, so that if we have
+      // changed things since the last layout, they will not be animated
+      // during subsequent layouts.
+      this.itemsChild.offsetHeight;
+      this.classList.remove('measure-items');
+      this.itemsChild.style.height = itemsHeight + 'px';
+      this.style.height = fixedHeight + 'px';
+      if (this.expanded)
+        this.list.leadItemHeight = fixedHeight;
+    },
+
+    /**
+     * Updates the origin summary to reflect changes in its items.
+     * Both IntentsListItem and IntentsTreeNode implement this API.
+     * This implementation scans the descendants to update the text.
+     */
+    updateOrigin: function() {
+      console.log('IntentsListItem.updateOrigin');
+      var text = '';
+      for (var i = 0; i < this.origin.children.length; ++i) {
+        if (text.length > 0)
+          text += ', ' + this.origin.children[i].data.action;
+        else
+          text = this.origin.children[i].data.action;
+      }
+      this.dataChild.textContent = text;
+
+      if (this.expanded)
+        this.updateItems_();
+    },
+
+    /**
+     * Updates the items section to reflect changes, animating to the new state.
+     * Removes existing contents and calls @{code IntentsTreeNode.createItems}.
+     * @private
+     */
+    updateItems_: function() {
+      this.disableAnimation_();
+      this.itemsChild.textContent = '';
+      this.infoChild.hidden = true;
+      this.selectedIndex_ = -1;
+      this.itemList_ = [];
+      if (this.origin)
+        this.origin.createItems(this);
+      this.itemsChild.appendChild(this.infoChild);
+      this.enableAnimation_();
+    },
+
+    /**
+     * Append a new intents node "bubble" to this list item.
+     * @param {IntentsTreeNode} node The intents node to add a bubble for.
+     * @param {Element} div The DOM element for the bubble itself.
+     * @return {number} The index the bubble was added at.
+     */
+    appendItem: function(node, div) {
+      this.itemList_.push({node: node, div: div});
+      this.itemsChild.appendChild(div);
+      return this.itemList_.length - 1;
+    },
+
+    /**
+     * The currently selected intents node ("intents bubble") index.
+     * @type {number}
+     * @private
+     */
+    selectedIndex_: -1,
+
+    /**
+     * Get the currently selected intents node ("intents bubble") index.
+     * @type {number}
+     */
+    get selectedIndex() {
+      return this.selectedIndex_;
+    },
+
+    /**
+     * Set the currently selected intents node ("intents bubble") index to
+     * @{code itemIndex}, unselecting any previously selected node first.
+     * @param {number} itemIndex The index to set as the selected index.
+     * TODO: KILL THIS
+     */
+    set selectedIndex(itemIndex) {
+      // Get the list index up front before we change anything.
+      var index = this.list.getIndexOfListItem(this);
+      // Unselect any previously selected item.
+      if (this.selectedIndex_ >= 0) {
+        var item = this.itemList_[this.selectedIndex_];
+        if (item && item.div)
+          item.div.removeAttribute('selected');
+      }
+      // Special case: decrementing -1 wraps around to the end of the list.
+      if (itemIndex == -2)
+        itemIndex = this.itemList_.length - 1;
+      // Check if we're going out of bounds and hide the item details.
+      if (itemIndex < 0 || itemIndex >= this.itemList_.length) {
+        this.selectedIndex_ = -1;
+        this.disableAnimation_();
+        this.infoChild.hidden = true;
+        this.enableAnimation_();
+        return;
+      }
+      // Set the new selected item and show the item details for it.
+      this.selectedIndex_ = itemIndex;
+      this.itemList_[itemIndex].div.setAttribute('selected', '');
+      this.disableAnimation_();
+      this.infoChild.hidden = false;
+      this.enableAnimation_();
+      // If we're near the bottom of the list this may cause the list item to go
+      // beyond the end of the visible area. Fix it after the animation is done.
+      var list = this.list;
+      window.setTimeout(function() { list.scrollIndexIntoView(index); }, 150);
+    },
+  };
+
+  /**
+   * {@code IntentsTreeNode}s mirror the structure of the intents tree lazily,
+   * and contain all the actual data used to generate the
+   * {@code IntentsListItem}s.
+   * @param {Object} data The data object for this node.
+   * @constructor
+   */
+  function IntentsTreeNode(data) {
+    this.data = data;
+    this.children = [];
+  }
+
+  IntentsTreeNode.prototype = {
+    /**
+     * Insert an intents tree node at the given index.
+     * Both IntentsList and IntentsTreeNode implement this API.
+     * @param {Object} data The data object for the node to add.
+     * @param {number} index The index at which to insert the node.
+     */
+    insertAt: function(data, index) {
+      console.log('IntentsTreeNode.insertAt adding ' +
+                  JSON.stringify(data) + ' at ' + index);
+      var child = new IntentsTreeNode(data);
+      this.children.splice(index, 0, child);
+      child.parent = this;
+      this.updateOrigin();
+    },
+
+    /**
+     * Remove an intents tree node from the given index.
+     * Both IntentsList and IntentsTreeNode implement this API.
+     * @param {number} index The index of the tree node to remove.
+     */
+    remove: function(index) {
+      if (index < this.children.length) {
+        this.children.splice(index, 1);
+        this.updateOrigin();
+      }
+    },
+
+    /**
+     * Clears all children.
+     * Both IntentsList and IntentsTreeNode implement this API.
+     * It is used by IntentsList.loadChildren().
+     */
+    clear: function() {
+      // We might leave some garbage in parentLookup for removed children.
+      // But that should be OK because parentLookup is cleared when we
+      // reload the tree.
+      this.children = [];
+      this.updateOrigin();
+    },
+
+    /**
+     * The counter used by startBatchUpdates() and endBatchUpdates().
+     * @type {number}
+     */
+    batchCount_: 0,
+
+    /**
+     * See cr.ui.List.startBatchUpdates().
+     * Both IntentsList (via List) and IntentsTreeNode implement this API.
+     */
+    startBatchUpdates: function() {
+      this.batchCount_++;
+    },
+
+    /**
+     * See cr.ui.List.endBatchUpdates().
+     * Both IntentsList (via List) and IntentsTreeNode implement this API.
+     */
+    endBatchUpdates: function() {
+      if (!--this.batchCount_)
+        this.updateOrigin();
+    },
+
+    /**
+     * Requests updating the origin summary to reflect changes in this item.
+     * Both IntentsListItem and IntentsTreeNode implement this API.
+     */
+    updateOrigin: function() {
+      if (!this.batchCount_ && this.parent)
+        this.parent.updateOrigin();
+    },
+
+    /**
+     * Create the intents services rows for this node.
+     * Append the rows to @{code item}.
+     * @param {IntentsListItem} item The intents list item to create items in.
+     */
+    createItems: function(item) {
+      if (this.children.length > 0) {
+        for (var i = 0; i < this.children.length; ++i)
+          this.children[i].createItems(item);
+      } else if (this.data && !this.data.hasChildren) {
+        var div = item.ownerDocument.createElement('div');
+        div.className = 'intents-item';
+        // Help out screen readers and such: this is a clickable thing.
+        div.setAttribute('role', 'button');
+
+        var divAction = item.ownerDocument.createElement('div');
+        divAction.className = 'intents-item-action';
+        divAction.textContent = this.data.action;
+        div.appendChild(divAction);
+
+        var divTypes = item.ownerDocument.createElement('div');
+        divTypes.className = 'intents-item-types';
+        var text = "";
+        for (var i = 0; i < this.data.types.length; ++i) {
+          if (text != "")
+            text += ", ";
+          text += this.data.types[i];
+        }
+        divTypes.textContent = text;
+        div.appendChild(divTypes);
+
+        var divUrl = item.ownerDocument.createElement('div');
+        divUrl.className = 'intents-item-url';
+        divUrl.textContent = this.data.url;
+        div.appendChild(divUrl);
+
+        var index = item.appendItem(this, div);
+        div.onclick = function() {
+          if (item.selectedIndex == index)
+            item.selectedIndex = -1;
+          else
+            item.selectedIndex = index;
+        };
+      }
+    },
+
+    /**
+     * The parent of this intents tree node.
+     * @type {?IntentsTreeNode|IntentsListItem}
+     */
+    get parent(parent) {
+      // See below for an explanation of this special case.
+      if (typeof this.parent_ == 'number')
+        return this.list_.getListItemByIndex(this.parent_);
+      return this.parent_;
+    },
+    set parent(parent) {
+      if (parent == this.parent)
+        return;
+
+      if (parent instanceof IntentsListItem) {
+        // If the parent is to be a IntentsListItem, then we keep the reference
+        // to it by its containing list and list index, rather than directly.
+        // This allows the list items to be garbage collected when they scroll
+        // out of view (except the expanded item, which we cache). This is
+        // transparent except in the setter and getter, where we handle it.
+        this.parent_ = parent.listIndex;
+        this.list_ = parent.list;
+        parent.addEventListener('listIndexChange',
+                                this.parentIndexChanged_.bind(this));
+      } else {
+        this.parent_ = parent;
+      }
+
+
+      if (parent)
+        parentLookup[this.pathId] = this;
+      else
+        delete parentLookup[this.pathId];
+
+      if (this.data && this.data.hasChildren &&
+          !this.children.length && !lookupRequests[this.pathId]) {
+        console.log('SENDING loadIntents');
+        lookupRequests[this.pathId] = true;
+        chrome.send('loadIntents', [this.pathId]);
+      }
+    },
+
+    /**
+     * Called when the parent is a IntentsListItem whose index has changed.
+     * See the code above that avoids keeping a direct reference to
+     * IntentsListItem parents, to allow them to be garbage collected.
+     * @private
+     */
+    parentIndexChanged_: function(event) {
+      if (typeof this.parent_ == 'number') {
+        this.parent_ = event.newValue;
+        // We set a timeout to update the origin, rather than doing it right
+        // away, because this callback may occur while the list items are
+        // being repopulated following a scroll event. Calling updateOrigin()
+        // immediately could trigger relayout that would reset the scroll
+        // position within the list, among other things.
+        window.setTimeout(this.updateOrigin.bind(this), 0);
+      }
+    },
+
+    /**
+     * The intents tree path id.
+     * @type {string}
+     */
+    get pathId() {
+      var parent = this.parent;
+      if (parent && parent instanceof IntentsTreeNode)
+        return parent.pathId + ',' + this.data.action;
+      return this.data.site;
+    },
+  };
+
+  /**
+   * Creates a new intents list.
+   * @param {Object=} opt_propertyBag Optional properties.
+   * @constructor
+   * @extends {DeletableItemList}
+   */
+  var IntentsList = cr.ui.define('list');
+
+  IntentsList.prototype = {
+    __proto__: DeletableItemList.prototype,
+
+    /** @inheritDoc */
+    decorate: function() {
+      DeletableItemList.prototype.decorate.call(this);
+      this.classList.add('intents-list');
+      this.data_ = [];
+      this.dataModel = new ArrayDataModel(this.data_);
+      this.addEventListener('keydown', this.handleKeyLeftRight_.bind(this));
+      var sm = new ListSingleSelectionModel();
+      sm.addEventListener('change', this.cookieSelectionChange_.bind(this));
+      sm.addEventListener('leadIndexChange', this.cookieLeadChange_.bind(this));
+      this.selectionModel = sm;
+    },
+
+    /**
+     * Handles key down events and looks for left and right arrows, then
+     * dispatches to the currently expanded item, if any.
+     * @param {Event} e The keydown event.
+     * @private
+     */
+    handleKeyLeftRight_: function(e) {
+      var id = e.keyIdentifier;
+      if ((id == 'Left' || id == 'Right') && this.expandedItem) {
+        var cs = this.ownerDocument.defaultView.getComputedStyle(this);
+        var rtl = cs.direction == 'rtl';
+        if ((!rtl && id == 'Left') || (rtl && id == 'Right'))
+          this.expandedItem.selectedIndex--;
+        else
+          this.expandedItem.selectedIndex++;
+        this.scrollIndexIntoView(this.expandedItem.listIndex);
+        // Prevent the page itself from scrolling.
+        e.preventDefault();
+      }
+    },
+
+    /**
+     * Called on selection model selection changes.
+     * @param {Event} ce The selection change event.
+     * @private
+     */
+    cookieSelectionChange_: function(ce) {
+      ce.changes.forEach(function(change) {
+          var listItem = this.getListItemByIndex(change.index);
+          if (listItem) {
+            if (!change.selected) {
+              // We set a timeout here, rather than setting the item unexpanded
+              // immediately, so that if another item gets set expanded right
+              // away, it will be expanded before this item is unexpanded. It
+              // will notice that, and unexpand this item in sync with its own
+              // expansion. Later, this callback will end up having no effect.
+              window.setTimeout(function() {
+                if (!listItem.selected || !listItem.lead)
+                  listItem.expanded = false;
+              }, 0);
+            } else if (listItem.lead) {
+              listItem.expanded = true;
+            }
+          }
+        }, this);
+    },
+
+    /**
+     * Called on selection model lead changes.
+     * @param {Event} pe The lead change event.
+     * @private
+     */
+    cookieLeadChange_: function(pe) {
+      if (pe.oldValue != -1) {
+        var listItem = this.getListItemByIndex(pe.oldValue);
+        if (listItem) {
+          // See cookieSelectionChange_ above for why we use a timeout here.
+          window.setTimeout(function() {
+            if (!listItem.lead || !listItem.selected)
+              listItem.expanded = false;
+          }, 0);
+        }
+      }
+      if (pe.newValue != -1) {
+        var listItem = this.getListItemByIndex(pe.newValue);
+        if (listItem && listItem.selected)
+          listItem.expanded = true;
+      }
+    },
+
+    /**
+     * The currently expanded item. Used by IntentsListItem above.
+     * @type {?IntentsListItem}
+     */
+    expandedItem: null,
+
+    // from cr.ui.List
+    /** @inheritDoc */
+    createItem: function(data) {
+      // We use the cached expanded item in order to allow it to maintain some
+      // state (like its fixed height, and which bubble is selected).
+      if (this.expandedItem && this.expandedItem.origin == data)
+        return this.expandedItem;
+      return new IntentsListItem(data, this);
+    },
+
+    // from options.DeletableItemList
+    /** @inheritDoc */
+    deleteItemAtIndex: function(index) {
+      var item = this.data_[index];
+      if (item) {
+        var pathId = item.pathId;
+        if (pathId)
+          chrome.send('removeIntent', [pathId]);
+      }
+    },
+
+    /**
+     * Insert an intents tree node at the given index.
+     * Both IntentsList and IntentsTreeNode implement this API.
+     * @param {Object} data The data object for the node to add.
+     * @param {number} index The index at which to insert the node.
+     */
+    insertAt: function(data, index) {
+      this.dataModel.splice(index, 0, new IntentsTreeNode(data));
+    },
+
+    /**
+     * Remove an intents tree node from the given index.
+     * Both IntentsList and IntentsTreeNode implement this API.
+     * @param {number} index The index of the tree node to remove.
+     */
+    remove: function(index) {
+      if (index < this.data_.length)
+        this.dataModel.splice(index, 1);
+    },
+
+    /**
+     * Clears the list.
+     * Both IntentsList and IntentsTreeNode implement this API.
+     * It is used by IntentsList.loadChildren().
+     */
+    clear: function() {
+      parentLookup = {};
+      this.data_ = [];
+      this.dataModel = new ArrayDataModel(this.data_);
+      this.redraw();
+    },
+
+    /**
+     * Add tree nodes by given parent.
+     * Note: this method will be O(n^2) in the general case. Use it only to
+     * populate an empty parent or to insert single nodes to avoid this.
+     * @param {Object} parent The parent node.
+     * @param {number} start Start index of where to insert nodes.
+     * @param {Array} nodesData Nodes data array.
+     * @private
+     */
+    addByParent_: function(parent, start, nodesData) {
+      if (!parent)
+        return;
+
+      parent.startBatchUpdates();
+      for (var i = 0; i < nodesData.length; ++i)
+        parent.insertAt(nodesData[i], start + i);
+      parent.endBatchUpdates();
+
+      cr.dispatchSimpleEvent(this, 'change');
+    },
+
+    /**
+     * Add tree nodes by parent id.
+     * This is used by intents_view.js.
+     * Note: this method will be O(n^2) in the general case. Use it only to
+     * populate an empty parent or to insert single nodes to avoid this.
+     * @param {string} parentId Id of the parent node.
+     * @param {number} start Start index of where to insert nodes.
+     * @param {Array} nodesData Nodes data array.
+     */
+    addByParentId: function(parentId, start, nodesData) {
+      var parent = parentId ? parentLookup[parentId] : this;
+      this.addByParent_(parent, start, nodesData);
+    },
+
+    /**
+     * Removes tree nodes by parent id.
+     * This is used by intents_view.js.
+     * @param {string} parentId Id of the parent node.
+     * @param {number} start Start index of nodes to remove.
+     * @param {number} count Number of nodes to remove.
+     */
+    removeByParentId: function(parentId, start, count) {
+      var parent = parentId ? parentLookup[parentId] : this;
+      if (!parent)
+        return;
+
+      parent.startBatchUpdates();
+      while (count-- > 0)
+        parent.remove(start);
+      parent.endBatchUpdates();
+
+      cr.dispatchSimpleEvent(this, 'change');
+    },
+
+    /**
+     * Loads the immediate children of given parent node.
+     * This is used by intents_view.js.
+     * @param {string} parentId Id of the parent node.
+     * @param {Array} children The immediate children of parent node.
+     */
+    loadChildren: function(parentId, children) {
+      console.log('Loading intents view: ' +
+                  parentId + ' ' + JSON.stringify(children));
+      if (parentId)
+        delete lookupRequests[parentId];
+      var parent = parentId ? parentLookup[parentId] : this;
+      if (!parent)
+        return;
+
+      parent.startBatchUpdates();
+      parent.clear();
+      this.addByParent_(parent, 0, children);
+      parent.endBatchUpdates();
+    },
+  };
+
+  return {
+    IntentsList: IntentsList
+  };
+});