Function scrollClientRegionIntoContainerView

javascript/atoms/action.js:741–758

(container)

    bot.dom.getOverflowState(element, opt_region);

  function scrollClientRegionIntoContainerView(container) {
    // Based largely from goog.style.scrollIntoContainerView.
    var containerRect = bot.dom.getClientRect(container);
    var containerBorder = goog.style.getBorderBox(container);

    // Relative position of the region to the container's content box.
    var relX = region.left - containerRect.left - containerBorder.left;
    var relY = region.top - containerRect.top - containerBorder.top;

    // How much the region can move in the container. Use the container's
    // clientWidth/Height, not containerRect, to account for the scrollbar.
    var spaceX = container.clientWidth + region.left - region.right;
    var spaceY = container.clientHeight + region.top - region.bottom;

    // Scroll the element into view of the container.
    container.scrollLeft += Math.min(relX, Math.max(relX - spaceX, 0));
    container.scrollTop += Math.min(relY, Math.max(relY - spaceY, 0));
  }
};