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All rights reserved.\n * This file is licensed to you under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License. You may obtain a copy\n * of the License at http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS\n * OF ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n */\n\n// We store a global list of elements that are currently transitioning,\n// mapped to a set of CSS properties that are transitioning for that element.\n// This is necessary rather than a simple count of transitions because of browser\n// bugs, e.g. Chrome sometimes fires both transitionend and transitioncancel rather\n// than one or the other. So we need to track what's actually transitioning so that\n// we can ignore these duplicate events.\nlet transitionsByElement = new Map<EventTarget, Set<string>>();\n\n// A list of callbacks to call once there are no transitioning elements.\nlet transitionCallbacks = new Set<() => void>();\n\nfunction setupGlobalEvents() {\n if (typeof window === 'undefined') {\n return;\n }\n\n function isTransitionEvent(event: Event): event is TransitionEvent {\n return 'propertyName' in event;\n }\n\n let onTransitionStart = (e: Event) => {\n if (!isTransitionEvent(e) || !e.target) {\n return;\n }\n // Add the transitioning property to the list for this element.\n let transitions = transitionsByElement.get(e.target);\n if (!transitions) {\n transitions = new Set();\n transitionsByElement.set(e.target, transitions);\n\n // The transitioncancel event must be registered on the element itself, rather than as a global\n // event. This enables us to handle when the node is deleted from the document while it is transitioning.\n // In that case, the cancel event would have nowhere to bubble to so we need to handle it directly.\n e.target.addEventListener('transitioncancel', onTransitionEnd, {\n once: true\n });\n }\n\n transitions.add(e.propertyName);\n };\n\n let onTransitionEnd = (e: Event) => {\n if (!isTransitionEvent(e) || !e.target) {\n return;\n }\n // Remove property from list of transitioning properties.\n let properties = transitionsByElement.get(e.target);\n if (!properties) {\n return;\n }\n\n properties.delete(e.propertyName);\n\n // If empty, remove transitioncancel event, and remove the element from the list of transitioning elements.\n if (properties.size === 0) {\n e.target.removeEventListener('transitioncancel', onTransitionEnd);\n transitionsByElement.delete(e.target);\n }\n\n // If no transitioning elements, call all of the queued callbacks.\n if (transitionsByElement.size === 0) {\n for (let cb of transitionCallbacks) {\n cb();\n }\n\n transitionCallbacks.clear();\n }\n };\n\n document.body.addEventListener('transitionrun', onTransitionStart);\n document.body.addEventListener('transitionend', onTransitionEnd);\n}\n\nif (typeof document !== 'undefined') {\n if (document.readyState !== 'loading') {\n setupGlobalEvents();\n } else {\n document.addEventListener('DOMContentLoaded', setupGlobalEvents);\n }\n}\n\nexport function runAfterTransition(fn: () => void) {\n // Wait one frame to see if an animation starts, e.g. a transition on mount.\n requestAnimationFrame(() => {\n // If no transitions are running, call the function immediately.\n // Otherwise, add it to a list of callbacks to run at the end of the animation.\n if (transitionsByElement.size === 0) {\n fn();\n } else {\n transitionCallbacks.add(fn);\n }\n });\n}\n"],"names":[],"version":3,"file":"runAfterTransition.module.js.map"} |