Roll Polymer

third_party/polymer/v1_0/components-chromium/iron-list/iron-list-extracted.js

 (function() {
 
   var IOS = navigator.userAgent.match(/iP(?:hone|ad;(?: U;)? CPU) OS (\d+)/);
   var IOS_TOUCH_SCROLLING = IOS && IOS[1] >= 8;
   var DEFAULT_PHYSICAL_COUNT = 3;
   var HIDDEN_Y = '-10000px';
   var DEFAULT_GRID_SIZE = 200;
   var SECRET_TABINDEX = -100;
 
   Polymer({
@@ skipping 1161 matching lines @@
      * Scroll to a specific index in the virtual list regardless
      * of the physical items in the DOM tree.
      *
      * @method scrollToIndex
      * @param {number} idx The index of the item
      */
     scrollToIndex: function(idx) {
       if (typeof idx !== 'number' || idx < 0 || idx > this.items.length - 1) {
         return;
       }
-
       Polymer.dom.flush();
-
+      // Items should have been rendered prior scrolling to an index.
+      if (!this._itemsRendered) {
+        return;
+      }
       idx = Math.min(Math.max(idx, 0), this._virtualCount-1);
       // update the virtual start only when needed
       if (!this._isIndexRendered(idx) || idx >= this._maxVirtualStart) {
         this._virtualStart = this.grid ? (idx - this._itemsPerRow * 2) : (idx - 1);
       }
       // manage focus
       this._manageFocus();
       // assign new models
       this._assignModels();
       // measure the new sizes
       this._updateMetrics();
-
       // estimate new physical offset
-      var estPhysicalTop = Math.floor(this._virtualStart / this._itemsPerRow)  * this._physicalAverage;
-      this._physicalTop = estPhysicalTop;
+      this._physicalTop = Math.floor(this._virtualStart / this._itemsPerRow)  * this._physicalAverage;
 
       var currentTopItem = this._physicalStart;
       var currentVirtualItem = this._virtualStart;
       var targetOffsetTop = 0;
       var hiddenContentSize = this._hiddenContentSize;
-
       // scroll to the item as much as we can
       while (currentVirtualItem < idx && targetOffsetTop <= hiddenContentSize) {
         targetOffsetTop = targetOffsetTop + this._getPhysicalSizeIncrement(currentTopItem);
         currentTopItem = (currentTopItem + 1) % this._physicalCount;
         currentVirtualItem++;
       }
       // update the scroller size
       this._updateScrollerSize(true);
       // update the position of the items
       this._positionItems();
@@ skipping 168 matching lines @@
       if (target.localName === 'input' ||
           target.localName === 'button' ||
           target.localName === 'select') {
         return;
       }
       // Set a temporary tabindex
       modelTabIndex = model.tabIndex;
       model.tabIndex = SECRET_TABINDEX;
       activeElTabIndex = activeEl ? activeEl.tabIndex : -1;
       model.tabIndex = modelTabIndex;
+
       // Only select the item if the tap wasn't on a focusable child
       // or the element bound to `tabIndex`
-      if (activeEl && physicalItem.contains(activeEl) && activeElTabIndex !== SECRET_TABINDEX) {
+      if (activeEl && physicalItem !== activeEl && physicalItem.contains(activeEl) && activeElTabIndex !== SECRET_TABINDEX) {
         return;
       }
       this.toggleSelectionForItem(model[this.as]);
     },
 
     _multiSelectionChanged: function(multiSelection) {
       this.clearSelection();
       this.$.selector.multi = multiSelection;
     },
 
@@ skipping 179 matching lines @@
       this._focusPhysicalItem(this._focusedIndex + 1);
     },
 
     _didEnter: function(e) {
       this._focusPhysicalItem(this._focusedIndex);
       this._selectionHandler(e.detail.keyboardEvent);
     }
   });
 
 })();