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: / var / canvas / node_modules / jquery-scroll-to-visible /
Filename : index.js
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/*
 * Copyright (C) 2011 - present Instructure, Inc.
 *
 * This file is part of Canvas.
 *
 * Canvas is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, version 3 of the License.
 *
 * Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

// Scrolls the supplied object until its visible. Call from
// ("html,body") to scroll the window.

import $ from 'jquery'
import './jquery.scrollTo'

$.fn.scrollToVisible = function (obj) {
  const options = {}
  const $obj = $(obj)

  if ($obj.length === 0) {
    return
  }
  let innerOffset = $obj.offset(),
    width = $obj.outerWidth(),
    height = $obj.outerHeight(),
    top = innerOffset.top,
    bottom = top + height,
    left = innerOffset.left,
    right = left + width,
    currentTop = this.selector == 'html,body' ? window.scrollY : this.scrollTop(),
    currentLeft = this.scrollLeft(),
    currentHeight = this.outerHeight(),
    currentWidth = this.outerWidth()

  if (this.selector != 'html,body') {
    let outerOffset = $('body').offset()
    this.each(function () {
      try {
        outerOffset = $(this).offset()
        return false
      } catch (e) {}
    })
    top -= outerOffset.top
    bottom -= outerOffset.top
    left -= outerOffset.left
    right -= outerOffset.left
  }

  if (this[0].tagName == 'HTML' || this[0].tagName == 'BODY') {
    currentHeight = $(window).height()
    if ($('#wizard_box:visible').length > 0) {
      currentHeight -= $('#wizard_box:visible').height()
    }
    currentWidth = $(window).width()
    top -= currentTop
    left -= currentLeft
    bottom -= currentTop
    right -= currentLeft
  }
  if (top < 0 || (currentHeight < height && bottom > currentHeight)) {
    options.scrollTop = top + currentTop
  } else if (bottom > currentHeight) {
    options.scrollTop = bottom + currentTop - currentHeight + 20
  }
  if (left < 0) {
    options.scrollLeft = left + currentLeft
  } else if (right > currentWidth) {
    options.scrollLeft = right + currentLeft - currentWidth + 20
  }
  if (options.scrollTop == 1) {
    options.scrollTop = 0
  }
  if (options.scrollLeft == 1) {
    options.scrollLeft = 0
  }

  this.scrollTop(options.scrollTop)
  this.scrollLeft(options.scrollLeft)

  return this
}