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Viewing file:     index.js (7.73 KB)      -rw-r--r--

let raf = null;
function requestAnimationFrame (callback) {
  if (!raf) {
    raf = (
      window.requestAnimationFrame ||
      window.webkitRequestAnimationFrame ||
      window.mozRequestAnimationFrame ||
      function (callback) {
        return setTimeout(callback, 16)
      }
    ).bind(window);
  }
  return raf(callback)
}

let caf = null;
function cancelAnimationFrame (id) {
  if (!caf) {
    caf = (
      window.cancelAnimationFrame ||
      window.webkitCancelAnimationFrame ||
      window.mozCancelAnimationFrame ||
      function (id) {
        clearTimeout(id);
      }
    ).bind(window);
  }

  caf(id);
}

function createStyles (styleText) {
  var style = document.createElement('style');
  style.type = 'text/css';

  if (style.styleSheet) {
    style.styleSheet.cssText = styleText;
  } else {
    style.appendChild(document.createTextNode(styleText));
  }
  (document.querySelector('head') || document.body).appendChild(style);
  return style
}

function createElement (tagName, props = {}) {
  let elem = document.createElement(tagName);
  Object.keys(props).forEach(key => {
    elem[key] = props[key];
  });
  return elem
}

function getComputedStyle (elem, prop, pseudo) {
  // for older versions of Firefox, `getComputedStyle` required
  // the second argument and may return `null` for some elements
  // when `display: none`
  let computedStyle = window.getComputedStyle(elem, pseudo || null) || {
    display: 'none'
  };

  return computedStyle[prop]
}

function getRenderInfo (elem) {
  if (!document.documentElement.contains(elem)) {
    return {
      detached: true,
      rendered: false
    }
  }

  let current = elem;
  while (current !== document) {
    if (getComputedStyle(current, 'display') === 'none') {
      return {
        detached: false,
        rendered: false
      }
    }
    current = current.parentNode;
  }

  return {
    detached: false,
    rendered: true
  }
}

var css = ".resize-triggers{visibility:hidden;opacity:0}.resize-contract-trigger,.resize-contract-trigger:before,.resize-expand-trigger,.resize-triggers{content:\"\";position:absolute;top:0;left:0;height:100%;width:100%;overflow:hidden}.resize-contract-trigger,.resize-expand-trigger{background:#eee;overflow:auto}.resize-contract-trigger:before{width:200%;height:200%}";

let total = 0;
let style = null;

function addListener (elem, callback) {
  if (!elem.__resize_mutation_handler__) {
    elem.__resize_mutation_handler__ = handleMutation.bind(elem);
  }

  let listeners = elem.__resize_listeners__;

  if (!listeners) {
    elem.__resize_listeners__ = [];
    if (window.ResizeObserver) {
      let { offsetWidth, offsetHeight } = elem;
      let ro = new ResizeObserver(() => {
        if (!elem.__resize_observer_triggered__) {
          elem.__resize_observer_triggered__ = true;
          if (elem.offsetWidth === offsetWidth && elem.offsetHeight === offsetHeight) {
            return
          }
        }
        runCallbacks(elem);
      });

      // initially display none won't trigger ResizeObserver callback
      let { detached, rendered } = getRenderInfo(elem);
      elem.__resize_observer_triggered__ = detached === false && rendered === false;
      elem.__resize_observer__ = ro;
      ro.observe(elem);
    } else if (elem.attachEvent && elem.addEventListener) {
      // targeting IE9/10
      elem.__resize_legacy_resize_handler__ = function handleLegacyResize () {
        runCallbacks(elem);
      };
      elem.attachEvent('onresize', elem.__resize_legacy_resize_handler__);
      document.addEventListener('DOMSubtreeModified', elem.__resize_mutation_handler__);
    } else {
      if (!total) {
        style = createStyles(css);
      }
      initTriggers(elem);

      elem.__resize_rendered__ = getRenderInfo(elem).rendered;
      if (window.MutationObserver) {
        let mo = new MutationObserver(elem.__resize_mutation_handler__);
        mo.observe(document, {
          attributes: true,
          childList: true,
          characterData: true,
          subtree: true
        });
        elem.__resize_mutation_observer__ = mo;
      }
    }
  }

  elem.__resize_listeners__.push(callback);
  total++;
}

function removeListener (elem, callback) {
  // targeting IE9/10
  if (elem.detachEvent && elem.removeEventListener) {
    elem.detachEvent('onresize', elem.__resize_legacy_resize_handler__);
    document.removeEventListener('DOMSubtreeModified', elem.__resize_mutation_handler__);
    return
  }

  let listeners = elem.__resize_listeners__;
  if (!listeners) {
    return
  }
  listeners.splice(listeners.indexOf(callback), 1);

  if (!listeners.length) {
    if (elem.__resize_observer__) {
      elem.__resize_observer__.unobserve(elem);
      elem.__resize_observer__.disconnect();
      elem.__resize_observer__ = null;
    } else {
      if (elem.__resize_mutation_observer__) {
        elem.__resize_mutation_observer__.disconnect();
        elem.__resize_mutation_observer__ = null;
      }
      elem.removeEventListener('scroll', handleScroll);
      elem.removeChild(elem.__resize_triggers__.triggers);
      elem.__resize_triggers__ = null;
    }
    elem.__resize_listeners__ = null;
  }

  if (!--total && style) {
    style.parentNode.removeChild(style);
  }
}

function getUpdatedSize (elem) {
  let { width, height } = elem.__resize_last__;
  let { offsetWidth, offsetHeight } = elem;
  if (offsetWidth !== width || offsetHeight !== height) {
    return {
      width: offsetWidth,
      height: offsetHeight
    }
  }
  return null
}

function handleMutation () {
  // `this` denotes the scrolling element
  let { rendered, detached } = getRenderInfo(this);
  if (rendered !== this.__resize_rendered__) {
    if (!detached && this.__resize_triggers__) {
      resetTriggers(this);
      this.addEventListener('scroll', handleScroll, true);
    }
    this.__resize_rendered__ = rendered;
    runCallbacks(this);
  }
}

function handleScroll () {
  // `this` denotes the scrolling element
  resetTriggers(this);
  if (this.__resize_raf__) {
    cancelAnimationFrame(this.__resize_raf__);
  }
  this.__resize_raf__ = requestAnimationFrame(() => {
    let updated = getUpdatedSize(this);
    if (updated) {
      this.__resize_last__ = updated;
      runCallbacks(this);
    }
  });
}

function runCallbacks (elem) {
  if (!elem || !elem.__resize_listeners__) {
    return
  }
  elem.__resize_listeners__.forEach(callback => {
    callback.call(elem);
  });
}

function initTriggers (elem) {
  let position = getComputedStyle(elem, 'position');
  if (!position || position === 'static') {
    elem.style.position = 'relative';
  }

  elem.__resize_old_position__ = position;
  elem.__resize_last__ = {};

  let triggers = createElement('div', {
    className: 'resize-triggers'
  });
  let expand = createElement('div', {
    className: 'resize-expand-trigger'
  });
  let expandChild = createElement('div');
  let contract = createElement('div', {
    className: 'resize-contract-trigger'
  });
  expand.appendChild(expandChild);
  triggers.appendChild(expand);
  triggers.appendChild(contract);
  elem.appendChild(triggers);

  elem.__resize_triggers__ = {
    triggers,
    expand,
    expandChild,
    contract
  };

  resetTriggers(elem);
  elem.addEventListener('scroll', handleScroll, true);

  elem.__resize_last__ = {
    width: elem.offsetWidth,
    height: elem.offsetHeight
  };
}

function resetTriggers (elem) {
  let { expand, expandChild, contract } = elem.__resize_triggers__;

  // batch read
  let { scrollWidth: csw, scrollHeight: csh } = contract;
  let { offsetWidth: eow, offsetHeight: eoh, scrollWidth: esw, scrollHeight: esh } = expand;

  // batch write
  contract.scrollLeft = csw;
  contract.scrollTop = csh;
  expandChild.style.width = eow + 1 + 'px';
  expandChild.style.height = eoh + 1 + 'px';
  expand.scrollLeft = esw;
  expand.scrollTop = esh;
}

export { addListener, removeListener };