1035 lines
29 KiB
JavaScript
1035 lines
29 KiB
JavaScript
(function (global, factory) {
|
|
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
|
|
typeof define === 'function' && define.amd ? define(factory) :
|
|
(global.ResizeObserver = factory());
|
|
}(this, (function () { 'use strict';
|
|
|
|
/**
|
|
* A collection of shims that provide minimal functionality of the ES6 collections.
|
|
*
|
|
* These implementations are not meant to be used outside of the ResizeObserver
|
|
* modules as they cover only a limited range of use cases.
|
|
*/
|
|
/* eslint-disable require-jsdoc, valid-jsdoc */
|
|
var MapShim = (function () {
|
|
if (typeof Map !== 'undefined') {
|
|
return Map;
|
|
}
|
|
|
|
/**
|
|
* Returns index in provided array that matches the specified key.
|
|
*
|
|
* @param {Array<Array>} arr
|
|
* @param {*} key
|
|
* @returns {number}
|
|
*/
|
|
function getIndex(arr, key) {
|
|
var result = -1;
|
|
|
|
arr.some(function (entry, index) {
|
|
if (entry[0] === key) {
|
|
result = index;
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
});
|
|
|
|
return result;
|
|
}
|
|
|
|
return (function () {
|
|
function anonymous() {
|
|
this.__entries__ = [];
|
|
}
|
|
|
|
var prototypeAccessors = { size: { configurable: true } };
|
|
|
|
/**
|
|
* @returns {boolean}
|
|
*/
|
|
prototypeAccessors.size.get = function () {
|
|
return this.__entries__.length;
|
|
};
|
|
|
|
/**
|
|
* @param {*} key
|
|
* @returns {*}
|
|
*/
|
|
anonymous.prototype.get = function (key) {
|
|
var index = getIndex(this.__entries__, key);
|
|
var entry = this.__entries__[index];
|
|
|
|
return entry && entry[1];
|
|
};
|
|
|
|
/**
|
|
* @param {*} key
|
|
* @param {*} value
|
|
* @returns {void}
|
|
*/
|
|
anonymous.prototype.set = function (key, value) {
|
|
var index = getIndex(this.__entries__, key);
|
|
|
|
if (~index) {
|
|
this.__entries__[index][1] = value;
|
|
} else {
|
|
this.__entries__.push([key, value]);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @param {*} key
|
|
* @returns {void}
|
|
*/
|
|
anonymous.prototype.delete = function (key) {
|
|
var entries = this.__entries__;
|
|
var index = getIndex(entries, key);
|
|
|
|
if (~index) {
|
|
entries.splice(index, 1);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @param {*} key
|
|
* @returns {void}
|
|
*/
|
|
anonymous.prototype.has = function (key) {
|
|
return !!~getIndex(this.__entries__, key);
|
|
};
|
|
|
|
/**
|
|
* @returns {void}
|
|
*/
|
|
anonymous.prototype.clear = function () {
|
|
this.__entries__.splice(0);
|
|
};
|
|
|
|
/**
|
|
* @param {Function} callback
|
|
* @param {*} [ctx=null]
|
|
* @returns {void}
|
|
*/
|
|
anonymous.prototype.forEach = function (callback, ctx) {
|
|
var this$1 = this;
|
|
if ( ctx === void 0 ) ctx = null;
|
|
|
|
for (var i = 0, list = this$1.__entries__; i < list.length; i += 1) {
|
|
var entry = list[i];
|
|
|
|
callback.call(ctx, entry[1], entry[0]);
|
|
}
|
|
};
|
|
|
|
Object.defineProperties( anonymous.prototype, prototypeAccessors );
|
|
|
|
return anonymous;
|
|
}());
|
|
})();
|
|
|
|
/**
|
|
* Detects whether window and document objects are available in current environment.
|
|
*/
|
|
var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && window.document === document;
|
|
|
|
// Returns global object of a current environment.
|
|
var global$1 = (function () {
|
|
if (typeof global !== 'undefined' && global.Math === Math) {
|
|
return global;
|
|
}
|
|
|
|
if (typeof self !== 'undefined' && self.Math === Math) {
|
|
return self;
|
|
}
|
|
|
|
if (typeof window !== 'undefined' && window.Math === Math) {
|
|
return window;
|
|
}
|
|
|
|
// eslint-disable-next-line no-new-func
|
|
return Function('return this')();
|
|
})();
|
|
|
|
/**
|
|
* A shim for the requestAnimationFrame which falls back to the setTimeout if
|
|
* first one is not supported.
|
|
*
|
|
* @returns {number} Requests' identifier.
|
|
*/
|
|
var requestAnimationFrame$1 = (function () {
|
|
if (typeof requestAnimationFrame === 'function') {
|
|
// It's required to use a bounded function because IE sometimes throws
|
|
// an "Invalid calling object" error if rAF is invoked without the global
|
|
// object on the left hand side.
|
|
return requestAnimationFrame.bind(global$1);
|
|
}
|
|
|
|
return function (callback) { return setTimeout(function () { return callback(Date.now()); }, 1000 / 60); };
|
|
})();
|
|
|
|
// Defines minimum timeout before adding a trailing call.
|
|
var trailingTimeout = 2;
|
|
|
|
/**
|
|
* Creates a wrapper function which ensures that provided callback will be
|
|
* invoked only once during the specified delay period.
|
|
*
|
|
* @param {Function} callback - Function to be invoked after the delay period.
|
|
* @param {number} delay - Delay after which to invoke callback.
|
|
* @returns {Function}
|
|
*/
|
|
var throttle = function (callback, delay) {
|
|
var leadingCall = false,
|
|
trailingCall = false,
|
|
lastCallTime = 0;
|
|
|
|
/**
|
|
* Invokes the original callback function and schedules new invocation if
|
|
* the "proxy" was called during current request.
|
|
*
|
|
* @returns {void}
|
|
*/
|
|
function resolvePending() {
|
|
if (leadingCall) {
|
|
leadingCall = false;
|
|
|
|
callback();
|
|
}
|
|
|
|
if (trailingCall) {
|
|
proxy();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Callback invoked after the specified delay. It will further postpone
|
|
* invocation of the original function delegating it to the
|
|
* requestAnimationFrame.
|
|
*
|
|
* @returns {void}
|
|
*/
|
|
function timeoutCallback() {
|
|
requestAnimationFrame$1(resolvePending);
|
|
}
|
|
|
|
/**
|
|
* Schedules invocation of the original function.
|
|
*
|
|
* @returns {void}
|
|
*/
|
|
function proxy() {
|
|
var timeStamp = Date.now();
|
|
|
|
if (leadingCall) {
|
|
// Reject immediately following calls.
|
|
if (timeStamp - lastCallTime < trailingTimeout) {
|
|
return;
|
|
}
|
|
|
|
// Schedule new call to be in invoked when the pending one is resolved.
|
|
// This is important for "transitions" which never actually start
|
|
// immediately so there is a chance that we might miss one if change
|
|
// happens amids the pending invocation.
|
|
trailingCall = true;
|
|
} else {
|
|
leadingCall = true;
|
|
trailingCall = false;
|
|
|
|
setTimeout(timeoutCallback, delay);
|
|
}
|
|
|
|
lastCallTime = timeStamp;
|
|
}
|
|
|
|
return proxy;
|
|
};
|
|
|
|
// Minimum delay before invoking the update of observers.
|
|
var REFRESH_DELAY = 20;
|
|
|
|
// A list of substrings of CSS properties used to find transition events that
|
|
// might affect dimensions of observed elements.
|
|
var transitionKeys = ['top', 'right', 'bottom', 'left', 'width', 'height', 'size', 'weight'];
|
|
|
|
// Check if MutationObserver is available.
|
|
var mutationObserverSupported = typeof MutationObserver !== 'undefined';
|
|
|
|
/**
|
|
* Singleton controller class which handles updates of ResizeObserver instances.
|
|
*/
|
|
var ResizeObserverController = function() {
|
|
this.connected_ = false;
|
|
this.mutationEventsAdded_ = false;
|
|
this.mutationsObserver_ = null;
|
|
this.observers_ = [];
|
|
|
|
this.onTransitionEnd_ = this.onTransitionEnd_.bind(this);
|
|
this.refresh = throttle(this.refresh.bind(this), REFRESH_DELAY);
|
|
};
|
|
|
|
/**
|
|
* Adds observer to observers list.
|
|
*
|
|
* @param {ResizeObserverSPI} observer - Observer to be added.
|
|
* @returns {void}
|
|
*/
|
|
|
|
|
|
/**
|
|
* Holds reference to the controller's instance.
|
|
*
|
|
* @private {ResizeObserverController}
|
|
*/
|
|
|
|
|
|
/**
|
|
* Keeps reference to the instance of MutationObserver.
|
|
*
|
|
* @private {MutationObserver}
|
|
*/
|
|
|
|
/**
|
|
* Indicates whether DOM listeners have been added.
|
|
*
|
|
* @private {boolean}
|
|
*/
|
|
ResizeObserverController.prototype.addObserver = function (observer) {
|
|
if (!~this.observers_.indexOf(observer)) {
|
|
this.observers_.push(observer);
|
|
}
|
|
|
|
// Add listeners if they haven't been added yet.
|
|
if (!this.connected_) {
|
|
this.connect_();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Removes observer from observers list.
|
|
*
|
|
* @param {ResizeObserverSPI} observer - Observer to be removed.
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverController.prototype.removeObserver = function (observer) {
|
|
var observers = this.observers_;
|
|
var index = observers.indexOf(observer);
|
|
|
|
// Remove observer if it's present in registry.
|
|
if (~index) {
|
|
observers.splice(index, 1);
|
|
}
|
|
|
|
// Remove listeners if controller has no connected observers.
|
|
if (!observers.length && this.connected_) {
|
|
this.disconnect_();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Invokes the update of observers. It will continue running updates insofar
|
|
* it detects changes.
|
|
*
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverController.prototype.refresh = function () {
|
|
var changesDetected = this.updateObservers_();
|
|
|
|
// Continue running updates if changes have been detected as there might
|
|
// be future ones caused by CSS transitions.
|
|
if (changesDetected) {
|
|
this.refresh();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Updates every observer from observers list and notifies them of queued
|
|
* entries.
|
|
*
|
|
* @private
|
|
* @returns {boolean} Returns "true" if any observer has detected changes in
|
|
* dimensions of it's elements.
|
|
*/
|
|
ResizeObserverController.prototype.updateObservers_ = function () {
|
|
// Collect observers that have active observations.
|
|
var activeObservers = this.observers_.filter(function (observer) {
|
|
return observer.gatherActive(), observer.hasActive();
|
|
});
|
|
|
|
// Deliver notifications in a separate cycle in order to avoid any
|
|
// collisions between observers, e.g. when multiple instances of
|
|
// ResizeObserver are tracking the same element and the callback of one
|
|
// of them changes content dimensions of the observed target. Sometimes
|
|
// this may result in notifications being blocked for the rest of observers.
|
|
activeObservers.forEach(function (observer) { return observer.broadcastActive(); });
|
|
|
|
return activeObservers.length > 0;
|
|
};
|
|
|
|
/**
|
|
* Initializes DOM listeners.
|
|
*
|
|
* @private
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverController.prototype.connect_ = function () {
|
|
// Do nothing if running in a non-browser environment or if listeners
|
|
// have been already added.
|
|
if (!isBrowser || this.connected_) {
|
|
return;
|
|
}
|
|
|
|
// Subscription to the "Transitionend" event is used as a workaround for
|
|
// delayed transitions. This way it's possible to capture at least the
|
|
// final state of an element.
|
|
document.addEventListener('transitionend', this.onTransitionEnd_);
|
|
|
|
window.addEventListener('resize', this.refresh);
|
|
|
|
if (mutationObserverSupported) {
|
|
this.mutationsObserver_ = new MutationObserver(this.refresh);
|
|
|
|
this.mutationsObserver_.observe(document, {
|
|
attributes: true,
|
|
childList: true,
|
|
characterData: true,
|
|
subtree: true
|
|
});
|
|
} else {
|
|
document.addEventListener('DOMSubtreeModified', this.refresh);
|
|
|
|
this.mutationEventsAdded_ = true;
|
|
}
|
|
|
|
this.connected_ = true;
|
|
};
|
|
|
|
/**
|
|
* Removes DOM listeners.
|
|
*
|
|
* @private
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverController.prototype.disconnect_ = function () {
|
|
// Do nothing if running in a non-browser environment or if listeners
|
|
// have been already removed.
|
|
if (!isBrowser || !this.connected_) {
|
|
return;
|
|
}
|
|
|
|
document.removeEventListener('transitionend', this.onTransitionEnd_);
|
|
window.removeEventListener('resize', this.refresh);
|
|
|
|
if (this.mutationsObserver_) {
|
|
this.mutationsObserver_.disconnect();
|
|
}
|
|
|
|
if (this.mutationEventsAdded_) {
|
|
document.removeEventListener('DOMSubtreeModified', this.refresh);
|
|
}
|
|
|
|
this.mutationsObserver_ = null;
|
|
this.mutationEventsAdded_ = false;
|
|
this.connected_ = false;
|
|
};
|
|
|
|
/**
|
|
* "Transitionend" event handler.
|
|
*
|
|
* @private
|
|
* @param {TransitionEvent} event
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverController.prototype.onTransitionEnd_ = function (ref) {
|
|
var propertyName = ref.propertyName; if ( propertyName === void 0 ) propertyName = '';
|
|
|
|
// Detect whether transition may affect dimensions of an element.
|
|
var isReflowProperty = transitionKeys.some(function (key) {
|
|
return !!~propertyName.indexOf(key);
|
|
});
|
|
|
|
if (isReflowProperty) {
|
|
this.refresh();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Returns instance of the ResizeObserverController.
|
|
*
|
|
* @returns {ResizeObserverController}
|
|
*/
|
|
ResizeObserverController.getInstance = function () {
|
|
if (!this.instance_) {
|
|
this.instance_ = new ResizeObserverController();
|
|
}
|
|
|
|
return this.instance_;
|
|
};
|
|
|
|
ResizeObserverController.instance_ = null;
|
|
|
|
/**
|
|
* Defines non-writable/enumerable properties of the provided target object.
|
|
*
|
|
* @param {Object} target - Object for which to define properties.
|
|
* @param {Object} props - Properties to be defined.
|
|
* @returns {Object} Target object.
|
|
*/
|
|
var defineConfigurable = (function (target, props) {
|
|
for (var i = 0, list = Object.keys(props); i < list.length; i += 1) {
|
|
var key = list[i];
|
|
|
|
Object.defineProperty(target, key, {
|
|
value: props[key],
|
|
enumerable: false,
|
|
writable: false,
|
|
configurable: true
|
|
});
|
|
}
|
|
|
|
return target;
|
|
});
|
|
|
|
/**
|
|
* Returns the global object associated with provided element.
|
|
*
|
|
* @param {Object} target
|
|
* @returns {Object}
|
|
*/
|
|
var getWindowOf = (function (target) {
|
|
// Assume that the element is an instance of Node, which means that it
|
|
// has the "ownerDocument" property from which we can retrieve a
|
|
// corresponding global object.
|
|
var ownerGlobal = target && target.ownerDocument && target.ownerDocument.defaultView;
|
|
|
|
// Return the local global object if it's not possible extract one from
|
|
// provided element.
|
|
return ownerGlobal || global$1;
|
|
});
|
|
|
|
// Placeholder of an empty content rectangle.
|
|
var emptyRect = createRectInit(0, 0, 0, 0);
|
|
|
|
/**
|
|
* Converts provided string to a number.
|
|
*
|
|
* @param {number|string} value
|
|
* @returns {number}
|
|
*/
|
|
function toFloat(value) {
|
|
return parseFloat(value) || 0;
|
|
}
|
|
|
|
/**
|
|
* Extracts borders size from provided styles.
|
|
*
|
|
* @param {CSSStyleDeclaration} styles
|
|
* @param {...string} positions - Borders positions (top, right, ...)
|
|
* @returns {number}
|
|
*/
|
|
function getBordersSize(styles) {
|
|
var positions = [], len = arguments.length - 1;
|
|
while ( len-- > 0 ) positions[ len ] = arguments[ len + 1 ];
|
|
|
|
return positions.reduce(function (size, position) {
|
|
var value = styles['border-' + position + '-width'];
|
|
|
|
return size + toFloat(value);
|
|
}, 0);
|
|
}
|
|
|
|
/**
|
|
* Extracts paddings sizes from provided styles.
|
|
*
|
|
* @param {CSSStyleDeclaration} styles
|
|
* @returns {Object} Paddings box.
|
|
*/
|
|
function getPaddings(styles) {
|
|
var positions = ['top', 'right', 'bottom', 'left'];
|
|
var paddings = {};
|
|
|
|
for (var i = 0, list = positions; i < list.length; i += 1) {
|
|
var position = list[i];
|
|
|
|
var value = styles['padding-' + position];
|
|
|
|
paddings[position] = toFloat(value);
|
|
}
|
|
|
|
return paddings;
|
|
}
|
|
|
|
/**
|
|
* Calculates content rectangle of provided SVG element.
|
|
*
|
|
* @param {SVGGraphicsElement} target - Element content rectangle of which needs
|
|
* to be calculated.
|
|
* @returns {DOMRectInit}
|
|
*/
|
|
function getSVGContentRect(target) {
|
|
var bbox = target.getBBox();
|
|
|
|
return createRectInit(0, 0, bbox.width, bbox.height);
|
|
}
|
|
|
|
/**
|
|
* Calculates content rectangle of provided HTMLElement.
|
|
*
|
|
* @param {HTMLElement} target - Element for which to calculate the content rectangle.
|
|
* @returns {DOMRectInit}
|
|
*/
|
|
function getHTMLElementContentRect(target) {
|
|
// Client width & height properties can't be
|
|
// used exclusively as they provide rounded values.
|
|
var clientWidth = target.clientWidth;
|
|
var clientHeight = target.clientHeight;
|
|
|
|
// By this condition we can catch all non-replaced inline, hidden and
|
|
// detached elements. Though elements with width & height properties less
|
|
// than 0.5 will be discarded as well.
|
|
//
|
|
// Without it we would need to implement separate methods for each of
|
|
// those cases and it's not possible to perform a precise and performance
|
|
// effective test for hidden elements. E.g. even jQuery's ':visible' filter
|
|
// gives wrong results for elements with width & height less than 0.5.
|
|
if (!clientWidth && !clientHeight) {
|
|
return emptyRect;
|
|
}
|
|
|
|
var styles = getWindowOf(target).getComputedStyle(target);
|
|
var paddings = getPaddings(styles);
|
|
var horizPad = paddings.left + paddings.right;
|
|
var vertPad = paddings.top + paddings.bottom;
|
|
|
|
// Computed styles of width & height are being used because they are the
|
|
// only dimensions available to JS that contain non-rounded values. It could
|
|
// be possible to utilize the getBoundingClientRect if only it's data wasn't
|
|
// affected by CSS transformations let alone paddings, borders and scroll bars.
|
|
var width = toFloat(styles.width),
|
|
height = toFloat(styles.height);
|
|
|
|
// Width & height include paddings and borders when the 'border-box' box
|
|
// model is applied (except for IE).
|
|
if (styles.boxSizing === 'border-box') {
|
|
// Following conditions are required to handle Internet Explorer which
|
|
// doesn't include paddings and borders to computed CSS dimensions.
|
|
//
|
|
// We can say that if CSS dimensions + paddings are equal to the "client"
|
|
// properties then it's either IE, and thus we don't need to subtract
|
|
// anything, or an element merely doesn't have paddings/borders styles.
|
|
if (Math.round(width + horizPad) !== clientWidth) {
|
|
width -= getBordersSize(styles, 'left', 'right') + horizPad;
|
|
}
|
|
|
|
if (Math.round(height + vertPad) !== clientHeight) {
|
|
height -= getBordersSize(styles, 'top', 'bottom') + vertPad;
|
|
}
|
|
}
|
|
|
|
// Following steps can't be applied to the document's root element as its
|
|
// client[Width/Height] properties represent viewport area of the window.
|
|
// Besides, it's as well not necessary as the <html> itself neither has
|
|
// rendered scroll bars nor it can be clipped.
|
|
if (!isDocumentElement(target)) {
|
|
// In some browsers (only in Firefox, actually) CSS width & height
|
|
// include scroll bars size which can be removed at this step as scroll
|
|
// bars are the only difference between rounded dimensions + paddings
|
|
// and "client" properties, though that is not always true in Chrome.
|
|
var vertScrollbar = Math.round(width + horizPad) - clientWidth;
|
|
var horizScrollbar = Math.round(height + vertPad) - clientHeight;
|
|
|
|
// Chrome has a rather weird rounding of "client" properties.
|
|
// E.g. for an element with content width of 314.2px it sometimes gives
|
|
// the client width of 315px and for the width of 314.7px it may give
|
|
// 314px. And it doesn't happen all the time. So just ignore this delta
|
|
// as a non-relevant.
|
|
if (Math.abs(vertScrollbar) !== 1) {
|
|
width -= vertScrollbar;
|
|
}
|
|
|
|
if (Math.abs(horizScrollbar) !== 1) {
|
|
height -= horizScrollbar;
|
|
}
|
|
}
|
|
|
|
return createRectInit(paddings.left, paddings.top, width, height);
|
|
}
|
|
|
|
/**
|
|
* Checks whether provided element is an instance of the SVGGraphicsElement.
|
|
*
|
|
* @param {Element} target - Element to be checked.
|
|
* @returns {boolean}
|
|
*/
|
|
var isSVGGraphicsElement = (function () {
|
|
// Some browsers, namely IE and Edge, don't have the SVGGraphicsElement
|
|
// interface.
|
|
if (typeof SVGGraphicsElement !== 'undefined') {
|
|
return function (target) { return target instanceof getWindowOf(target).SVGGraphicsElement; };
|
|
}
|
|
|
|
// If it's so, then check that element is at least an instance of the
|
|
// SVGElement and that it has the "getBBox" method.
|
|
// eslint-disable-next-line no-extra-parens
|
|
return function (target) { return target instanceof getWindowOf(target).SVGElement && typeof target.getBBox === 'function'; };
|
|
})();
|
|
|
|
/**
|
|
* Checks whether provided element is a document element (<html>).
|
|
*
|
|
* @param {Element} target - Element to be checked.
|
|
* @returns {boolean}
|
|
*/
|
|
function isDocumentElement(target) {
|
|
return target === getWindowOf(target).document.documentElement;
|
|
}
|
|
|
|
/**
|
|
* Calculates an appropriate content rectangle for provided html or svg element.
|
|
*
|
|
* @param {Element} target - Element content rectangle of which needs to be calculated.
|
|
* @returns {DOMRectInit}
|
|
*/
|
|
function getContentRect(target) {
|
|
if (!isBrowser) {
|
|
return emptyRect;
|
|
}
|
|
|
|
if (isSVGGraphicsElement(target)) {
|
|
return getSVGContentRect(target);
|
|
}
|
|
|
|
return getHTMLElementContentRect(target);
|
|
}
|
|
|
|
/**
|
|
* Creates rectangle with an interface of the DOMRectReadOnly.
|
|
* Spec: https://drafts.fxtf.org/geometry/#domrectreadonly
|
|
*
|
|
* @param {DOMRectInit} rectInit - Object with rectangle's x/y coordinates and dimensions.
|
|
* @returns {DOMRectReadOnly}
|
|
*/
|
|
function createReadOnlyRect(ref) {
|
|
var x = ref.x;
|
|
var y = ref.y;
|
|
var width = ref.width;
|
|
var height = ref.height;
|
|
|
|
// If DOMRectReadOnly is available use it as a prototype for the rectangle.
|
|
var Constr = typeof DOMRectReadOnly !== 'undefined' ? DOMRectReadOnly : Object;
|
|
var rect = Object.create(Constr.prototype);
|
|
|
|
// Rectangle's properties are not writable and non-enumerable.
|
|
defineConfigurable(rect, {
|
|
x: x, y: y, width: width, height: height,
|
|
top: y,
|
|
right: x + width,
|
|
bottom: height + y,
|
|
left: x
|
|
});
|
|
|
|
return rect;
|
|
}
|
|
|
|
/**
|
|
* Creates DOMRectInit object based on the provided dimensions and the x/y coordinates.
|
|
* Spec: https://drafts.fxtf.org/geometry/#dictdef-domrectinit
|
|
*
|
|
* @param {number} x - X coordinate.
|
|
* @param {number} y - Y coordinate.
|
|
* @param {number} width - Rectangle's width.
|
|
* @param {number} height - Rectangle's height.
|
|
* @returns {DOMRectInit}
|
|
*/
|
|
function createRectInit(x, y, width, height) {
|
|
return { x: x, y: y, width: width, height: height };
|
|
}
|
|
|
|
/**
|
|
* Class that is responsible for computations of the content rectangle of
|
|
* provided DOM element and for keeping track of it's changes.
|
|
*/
|
|
var ResizeObservation = function(target) {
|
|
this.broadcastWidth = 0;
|
|
this.broadcastHeight = 0;
|
|
this.contentRect_ = createRectInit(0, 0, 0, 0);
|
|
|
|
this.target = target;
|
|
};
|
|
|
|
/**
|
|
* Updates content rectangle and tells whether it's width or height properties
|
|
* have changed since the last broadcast.
|
|
*
|
|
* @returns {boolean}
|
|
*/
|
|
|
|
|
|
/**
|
|
* Reference to the last observed content rectangle.
|
|
*
|
|
* @private {DOMRectInit}
|
|
*/
|
|
|
|
|
|
/**
|
|
* Broadcasted width of content rectangle.
|
|
*
|
|
* @type {number}
|
|
*/
|
|
ResizeObservation.prototype.isActive = function () {
|
|
var rect = getContentRect(this.target);
|
|
|
|
this.contentRect_ = rect;
|
|
|
|
return rect.width !== this.broadcastWidth || rect.height !== this.broadcastHeight;
|
|
};
|
|
|
|
/**
|
|
* Updates 'broadcastWidth' and 'broadcastHeight' properties with a data
|
|
* from the corresponding properties of the last observed content rectangle.
|
|
*
|
|
* @returns {DOMRectInit} Last observed content rectangle.
|
|
*/
|
|
ResizeObservation.prototype.broadcastRect = function () {
|
|
var rect = this.contentRect_;
|
|
|
|
this.broadcastWidth = rect.width;
|
|
this.broadcastHeight = rect.height;
|
|
|
|
return rect;
|
|
};
|
|
|
|
var ResizeObserverEntry = function(target, rectInit) {
|
|
var contentRect = createReadOnlyRect(rectInit);
|
|
|
|
// According to the specification following properties are not writable
|
|
// and are also not enumerable in the native implementation.
|
|
//
|
|
// Property accessors are not being used as they'd require to define a
|
|
// private WeakMap storage which may cause memory leaks in browsers that
|
|
// don't support this type of collections.
|
|
defineConfigurable(this, { target: target, contentRect: contentRect });
|
|
};
|
|
|
|
var ResizeObserverSPI = function(callback, controller, callbackCtx) {
|
|
this.activeObservations_ = [];
|
|
this.observations_ = new MapShim();
|
|
|
|
if (typeof callback !== 'function') {
|
|
throw new TypeError('The callback provided as parameter 1 is not a function.');
|
|
}
|
|
|
|
this.callback_ = callback;
|
|
this.controller_ = controller;
|
|
this.callbackCtx_ = callbackCtx;
|
|
};
|
|
|
|
/**
|
|
* Starts observing provided element.
|
|
*
|
|
* @param {Element} target - Element to be observed.
|
|
* @returns {void}
|
|
*/
|
|
|
|
|
|
/**
|
|
* Registry of the ResizeObservation instances.
|
|
*
|
|
* @private {Map<Element, ResizeObservation>}
|
|
*/
|
|
|
|
|
|
/**
|
|
* Public ResizeObserver instance which will be passed to the callback
|
|
* function and used as a value of it's "this" binding.
|
|
*
|
|
* @private {ResizeObserver}
|
|
*/
|
|
|
|
/**
|
|
* Collection of resize observations that have detected changes in dimensions
|
|
* of elements.
|
|
*
|
|
* @private {Array<ResizeObservation>}
|
|
*/
|
|
ResizeObserverSPI.prototype.observe = function (target) {
|
|
if (!arguments.length) {
|
|
throw new TypeError('1 argument required, but only 0 present.');
|
|
}
|
|
|
|
// Do nothing if current environment doesn't have the Element interface.
|
|
if (typeof Element === 'undefined' || !(Element instanceof Object)) {
|
|
return;
|
|
}
|
|
|
|
if (!(target instanceof getWindowOf(target).Element)) {
|
|
throw new TypeError('parameter 1 is not of type "Element".');
|
|
}
|
|
|
|
var observations = this.observations_;
|
|
|
|
// Do nothing if element is already being observed.
|
|
if (observations.has(target)) {
|
|
return;
|
|
}
|
|
|
|
observations.set(target, new ResizeObservation(target));
|
|
|
|
this.controller_.addObserver(this);
|
|
|
|
// Force the update of observations.
|
|
this.controller_.refresh();
|
|
};
|
|
|
|
/**
|
|
* Stops observing provided element.
|
|
*
|
|
* @param {Element} target - Element to stop observing.
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverSPI.prototype.unobserve = function (target) {
|
|
if (!arguments.length) {
|
|
throw new TypeError('1 argument required, but only 0 present.');
|
|
}
|
|
|
|
// Do nothing if current environment doesn't have the Element interface.
|
|
if (typeof Element === 'undefined' || !(Element instanceof Object)) {
|
|
return;
|
|
}
|
|
|
|
if (!(target instanceof getWindowOf(target).Element)) {
|
|
throw new TypeError('parameter 1 is not of type "Element".');
|
|
}
|
|
|
|
var observations = this.observations_;
|
|
|
|
// Do nothing if element is not being observed.
|
|
if (!observations.has(target)) {
|
|
return;
|
|
}
|
|
|
|
observations.delete(target);
|
|
|
|
if (!observations.size) {
|
|
this.controller_.removeObserver(this);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Stops observing all elements.
|
|
*
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverSPI.prototype.disconnect = function () {
|
|
this.clearActive();
|
|
this.observations_.clear();
|
|
this.controller_.removeObserver(this);
|
|
};
|
|
|
|
/**
|
|
* Collects observation instances the associated element of which has changed
|
|
* it's content rectangle.
|
|
*
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverSPI.prototype.gatherActive = function () {
|
|
var this$1 = this;
|
|
|
|
this.clearActive();
|
|
|
|
this.observations_.forEach(function (observation) {
|
|
if (observation.isActive()) {
|
|
this$1.activeObservations_.push(observation);
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Invokes initial callback function with a list of ResizeObserverEntry
|
|
* instances collected from active resize observations.
|
|
*
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverSPI.prototype.broadcastActive = function () {
|
|
// Do nothing if observer doesn't have active observations.
|
|
if (!this.hasActive()) {
|
|
return;
|
|
}
|
|
|
|
var ctx = this.callbackCtx_;
|
|
|
|
// Create ResizeObserverEntry instance for every active observation.
|
|
var entries = this.activeObservations_.map(function (observation) {
|
|
return new ResizeObserverEntry(observation.target, observation.broadcastRect());
|
|
});
|
|
|
|
this.callback_.call(ctx, entries, ctx);
|
|
this.clearActive();
|
|
};
|
|
|
|
/**
|
|
* Clears the collection of active observations.
|
|
*
|
|
* @returns {void}
|
|
*/
|
|
ResizeObserverSPI.prototype.clearActive = function () {
|
|
this.activeObservations_.splice(0);
|
|
};
|
|
|
|
/**
|
|
* Tells whether observer has active observations.
|
|
*
|
|
* @returns {boolean}
|
|
*/
|
|
ResizeObserverSPI.prototype.hasActive = function () {
|
|
return this.activeObservations_.length > 0;
|
|
};
|
|
|
|
// Registry of internal observers. If WeakMap is not available use current shim
|
|
// for the Map collection as it has all required methods and because WeakMap
|
|
// can't be fully polyfilled anyway.
|
|
var observers = typeof WeakMap !== 'undefined' ? new WeakMap() : new MapShim();
|
|
|
|
/**
|
|
* ResizeObserver API. Encapsulates the ResizeObserver SPI implementation
|
|
* exposing only those methods and properties that are defined in the spec.
|
|
*/
|
|
var ResizeObserver = function(callback) {
|
|
if (!(this instanceof ResizeObserver)) {
|
|
throw new TypeError('Cannot call a class as a function.');
|
|
}
|
|
if (!arguments.length) {
|
|
throw new TypeError('1 argument required, but only 0 present.');
|
|
}
|
|
|
|
var controller = ResizeObserverController.getInstance();
|
|
var observer = new ResizeObserverSPI(callback, controller, this);
|
|
|
|
observers.set(this, observer);
|
|
};
|
|
|
|
// Expose public methods of ResizeObserver.
|
|
['observe', 'unobserve', 'disconnect'].forEach(function (method) {
|
|
ResizeObserver.prototype[method] = function () {
|
|
return (ref = observers.get(this))[method].apply(ref, arguments);
|
|
var ref;
|
|
};
|
|
});
|
|
|
|
var index = (function () {
|
|
// Export existing implementation if available.
|
|
if (typeof global$1.ResizeObserver !== 'undefined') {
|
|
return global$1.ResizeObserver;
|
|
}
|
|
|
|
global$1.ResizeObserver = ResizeObserver;
|
|
|
|
return ResizeObserver;
|
|
})();
|
|
|
|
return index;
|
|
|
|
})));
|