planning

node_modules/@juggle/resize-observer/lib/utils/scheduler.js

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+import { process } from './process';
+import { global } from './global';
+import { queueResizeObserver } from './queueResizeObserver';
+var watching = 0;
+var isWatching = function () { return !!watching; };
+var CATCH_PERIOD = 250;
+var observerConfig = { attributes: true, characterData: true, childList: true, subtree: true };
+var events = [
+    'resize',
+    'load',
+    'transitionend',
+    'animationend',
+    'animationstart',
+    'animationiteration',
+    'keyup',
+    'keydown',
+    'mouseup',
+    'mousedown',
+    'mouseover',
+    'mouseout',
+    'blur',
+    'focus'
+];
+var time = function (timeout) {
+    if (timeout === void 0) { timeout = 0; }
+    return Date.now() + timeout;
+};
+var scheduled = false;
+var Scheduler = (function () {
+    function Scheduler() {
+        var _this = this;
+        this.stopped = true;
+        this.listener = function () { return _this.schedule(); };
+    }
+    Scheduler.prototype.run = function (timeout) {
+        var _this = this;
+        if (timeout === void 0) { timeout = CATCH_PERIOD; }
+        if (scheduled) {
+            return;
+        }
+        scheduled = true;
+        var until = time(timeout);
+        queueResizeObserver(function () {
+            var elementsHaveResized = false;
+            try {
+                elementsHaveResized = process();
+            }
+            finally {
+                scheduled = false;
+                timeout = until - time();
+                if (!isWatching()) {
+                    return;
+                }
+                if (elementsHaveResized) {
+                    _this.run(1000);
+                }
+                else if (timeout > 0) {
+                    _this.run(timeout);
+                }
+                else {
+                    _this.start();
+                }
+            }
+        });
+    };
+    Scheduler.prototype.schedule = function () {
+        this.stop();
+        this.run();
+    };
+    Scheduler.prototype.observe = function () {
+        var _this = this;
+        var cb = function () { return _this.observer && _this.observer.observe(document.body, observerConfig); };
+        document.body ? cb() : global.addEventListener('DOMContentLoaded', cb);
+    };
+    Scheduler.prototype.start = function () {
+        var _this = this;
+        if (this.stopped) {
+            this.stopped = false;
+            this.observer = new MutationObserver(this.listener);
+            this.observe();
+            events.forEach(function (name) { return global.addEventListener(name, _this.listener, true); });
+        }
+    };
+    Scheduler.prototype.stop = function () {
+        var _this = this;
+        if (!this.stopped) {
+            this.observer && this.observer.disconnect();
+            events.forEach(function (name) { return global.removeEventListener(name, _this.listener, true); });
+            this.stopped = true;
+        }
+    };
+    return Scheduler;
+}());
+var scheduler = new Scheduler();
+var updateCount = function (n) {
+    !watching && n > 0 && scheduler.start();
+    watching += n;
+    !watching && scheduler.stop();
+};
+export { scheduler, updateCount };