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Viewing file:     detectElementResize.js (8.24 KB)      -rw-r--r--

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = createDetectElementResize;

/**
 * Detect Element Resize.
 * https://github.com/sdecima/javascript-detect-element-resize
 * Sebastian Decima
 *
 * Forked from version 0.5.3; includes the following modifications:
 * 1) Guard against unsafe 'window' and 'document' references (to support SSR).
 * 2) Defer initialization code via a top-level function wrapper (to support SSR).
 * 3) Avoid unnecessary reflows by not measuring size for scroll events bubbling from children.
 * 4) Add nonce for style element.
 * 5) Added support for injecting custom window object
 **/
function createDetectElementResize(nonce, hostWindow) {
  // Check `document` and `window` in case of server-side rendering
  var _window;

  if (typeof hostWindow !== 'undefined') {
    _window = hostWindow;
  } else if (typeof window !== 'undefined') {
    _window = window;
  } else if (typeof self !== 'undefined') {
    _window = self;
  } else {
    _window = global;
  }

  var attachEvent = typeof _window.document !== 'undefined' && _window.document.attachEvent;

  if (!attachEvent) {
    var requestFrame = function () {
      var raf = _window.requestAnimationFrame || _window.mozRequestAnimationFrame || _window.webkitRequestAnimationFrame || function (fn) {
        return _window.setTimeout(fn, 20);
      };

      return function (fn) {
        return raf(fn);
      };
    }();

    var cancelFrame = function () {
      var cancel = _window.cancelAnimationFrame || _window.mozCancelAnimationFrame || _window.webkitCancelAnimationFrame || _window.clearTimeout;
      return function (id) {
        return cancel(id);
      };
    }();

    var resetTriggers = function resetTriggers(element) {
      var triggers = element.__resizeTriggers__,
          expand = triggers.firstElementChild,
          contract = triggers.lastElementChild,
          expandChild = expand.firstElementChild;
      contract.scrollLeft = contract.scrollWidth;
      contract.scrollTop = contract.scrollHeight;
      expandChild.style.width = expand.offsetWidth + 1 + 'px';
      expandChild.style.height = expand.offsetHeight + 1 + 'px';
      expand.scrollLeft = expand.scrollWidth;
      expand.scrollTop = expand.scrollHeight;
    };

    var checkTriggers = function checkTriggers(element) {
      return element.offsetWidth != element.__resizeLast__.width || element.offsetHeight != element.__resizeLast__.height;
    };

    var scrollListener = function scrollListener(e) {
      // Don't measure (which forces) reflow for scrolls that happen inside of children!
      if (e.target.className && typeof e.target.className.indexOf === 'function' && e.target.className.indexOf('contract-trigger') < 0 && e.target.className.indexOf('expand-trigger') < 0) {
        return;
      }

      var element = this;
      resetTriggers(this);

      if (this.__resizeRAF__) {
        cancelFrame(this.__resizeRAF__);
      }

      this.__resizeRAF__ = requestFrame(function () {
        if (checkTriggers(element)) {
          element.__resizeLast__.width = element.offsetWidth;
          element.__resizeLast__.height = element.offsetHeight;

          element.__resizeListeners__.forEach(function (fn) {
            fn.call(element, e);
          });
        }
      });
    };
    /* Detect CSS Animations support to detect element display/re-attach */


    var animation = false,
        keyframeprefix = '',
        animationstartevent = 'animationstart',
        domPrefixes = 'Webkit Moz O ms'.split(' '),
        startEvents = 'webkitAnimationStart animationstart oAnimationStart MSAnimationStart'.split(' '),
        pfx = '';
    {
      var elm = _window.document.createElement('fakeelement');

      if (elm.style.animationName !== undefined) {
        animation = true;
      }

      if (animation === false) {
        for (var i = 0; i < domPrefixes.length; i++) {
          if (elm.style[domPrefixes[i] + 'AnimationName'] !== undefined) {
            pfx = domPrefixes[i];
            keyframeprefix = '-' + pfx.toLowerCase() + '-';
            animationstartevent = startEvents[i];
            animation = true;
            break;
          }
        }
      }
    }
    var animationName = 'resizeanim';
    var animationKeyframes = '@' + keyframeprefix + 'keyframes ' + animationName + ' { from { opacity: 0; } to { opacity: 0; } } ';
    var animationStyle = keyframeprefix + 'animation: 1ms ' + animationName + '; ';
  }

  var createStyles = function createStyles(doc) {
    if (!doc.getElementById('detectElementResize')) {
      //opacity:0 works around a chrome bug https://code.google.com/p/chromium/issues/detail?id=286360
      var css = (animationKeyframes ? animationKeyframes : '') + '.resize-triggers { ' + (animationStyle ? animationStyle : '') + 'visibility: hidden; opacity: 0; } ' + '.resize-triggers, .resize-triggers > div, .contract-trigger:before { content: " "; display: block; position: absolute; top: 0; left: 0; height: 100%; width: 100%; overflow: hidden; z-index: -1; } .resize-triggers > div { background: #eee; overflow: auto; } .contract-trigger:before { width: 200%; height: 200%; }',
          head = doc.head || doc.getElementsByTagName('head')[0],
          style = doc.createElement('style');
      style.id = 'detectElementResize';
      style.type = 'text/css';

      if (nonce != null) {
        style.setAttribute('nonce', nonce);
      }

      if (style.styleSheet) {
        style.styleSheet.cssText = css;
      } else {
        style.appendChild(doc.createTextNode(css));
      }

      head.appendChild(style);
    }
  };

  var addResizeListener = function addResizeListener(element, fn) {
    if (attachEvent) {
      element.attachEvent('onresize', fn);
    } else {
      if (!element.__resizeTriggers__) {
        var doc = element.ownerDocument;

        var elementStyle = _window.getComputedStyle(element);

        if (elementStyle && elementStyle.position == 'static') {
          element.style.position = 'relative';
        }

        createStyles(doc);
        element.__resizeLast__ = {};
        element.__resizeListeners__ = [];
        (element.__resizeTriggers__ = doc.createElement('div')).className = 'resize-triggers';
        var resizeTriggersHtml = '<div class="expand-trigger"><div></div></div>' + '<div class="contract-trigger"></div>';

        if (window.trustedTypes) {
          var staticPolicy = trustedTypes.createPolicy('react-virtualized-auto-sizer', {
            createHTML: function createHTML() {
              return resizeTriggersHtml;
            }
          });
          element.__resizeTriggers__.innerHTML = staticPolicy.createHTML('');
        } else {
          element.__resizeTriggers__.innerHTML = resizeTriggersHtml;
        }

        element.appendChild(element.__resizeTriggers__);
        resetTriggers(element);
        element.addEventListener('scroll', scrollListener, true);
        /* Listen for a css animation to detect element display/re-attach */

        if (animationstartevent) {
          element.__resizeTriggers__.__animationListener__ = function animationListener(e) {
            if (e.animationName == animationName) {
              resetTriggers(element);
            }
          };

          element.__resizeTriggers__.addEventListener(animationstartevent, element.__resizeTriggers__.__animationListener__);
        }
      }

      element.__resizeListeners__.push(fn);
    }
  };

  var removeResizeListener = function removeResizeListener(element, fn) {
    if (attachEvent) {
      element.detachEvent('onresize', fn);
    } else {
      element.__resizeListeners__.splice(element.__resizeListeners__.indexOf(fn), 1);

      if (!element.__resizeListeners__.length) {
        element.removeEventListener('scroll', scrollListener, true);

        if (element.__resizeTriggers__.__animationListener__) {
          element.__resizeTriggers__.removeEventListener(animationstartevent, element.__resizeTriggers__.__animationListener__);

          element.__resizeTriggers__.__animationListener__ = null;
        }

        try {
          element.__resizeTriggers__ = !element.removeChild(element.__resizeTriggers__);
        } catch (e) {// Preact compat; see developit/preact-compat/issues/228
        }
      }
    }
  };

  return {
    addResizeListener: addResizeListener,
    removeResizeListener: removeResizeListener
  };
}