VirtualRepeatContainerController.prototype.handleScroll_ = function()

in src/components/virtualRepeat/virtual-repeater.js [389:425]

• 31 lines of code
• 16 McCabe index (conditional complexity)

VirtualRepeatContainerController.prototype.handleScroll_ = function() {
  if (!this.ltr && !this.maxSize) {
    this.scroller.scrollLeft = this.scrollSize;
    this.maxSize = this.scroller.scrollLeft;
  }
  var offset = this.isHorizontal() ?
      (this.ltr ? this.scroller.scrollLeft : this.maxSize - this.scroller.scrollLeft)
      : this.scroller.scrollTop;
  if (this.scrollSize < this.size) return;
  if (offset > this.scrollSize - this.size) {
    offset = this.scrollSize - this.size;
  }
  if (offset === this.scrollOffset) return;

  var itemSize = this.repeater.getItemSize();
  if (!itemSize) return;

  var numItems = Math.max(0, Math.floor(offset / itemSize) - NUM_EXTRA);

  var transform = (this.isHorizontal() ? 'translateX(' : 'translateY(') +
      (!this.isHorizontal() || this.ltr ? (numItems * itemSize) : - (numItems * itemSize))  + 'px)';

  this.scrollOffset = offset;
  this.offsetter.style.webkitTransform = transform;
  this.offsetter.style.transform = transform;

  if (this.bindTopIndex) {
    var topIndex = Math.floor(offset / itemSize);
    if (topIndex !== this.topIndex && topIndex < this.repeater.getItemCount()) {
      this.topIndex = topIndex;
      this.bindTopIndex.assign(this.$scope, topIndex);
      if (!this.$rootScope.$$phase) this.$scope.$digest();
    }
  }

  this.repeater.containerUpdated();
};