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var H5P = H5P || {}; /** * Transition contains helper function relevant for transitioning */ H5P.Transition = (function ($) { /** * @class * @namespace H5P */ Transition = {}; /** * @private */ Transition.transitionEndEventNames = { 'WebkitTransition': 'webkitTransitionEnd', 'transition': 'transitionend', 'MozTransition': 'transitionend', 'OTransition': 'oTransitionEnd', 'msTransition': 'MSTransitionEnd' }; /** * @private */ Transition.cache = []; /** * Get the vendor property name for an event * * @function H5P.Transition.getVendorPropertyName * @static * @private * @param {string} prop Generic property name * @return {string} Vendor specific property name */ Transition.getVendorPropertyName = function (prop) { if (Transition.cache[prop] !== undefined) { return Transition.cache[prop]; } var div = document.createElement('div'); // Handle unprefixed versions (FF16+, for example) if (prop in div.style) { Transition.cache[prop] = prop; } else { var prefixes = ['Moz', 'Webkit', 'O', 'ms']; var prop_ = prop.charAt(0).toUpperCase() + prop.substr(1); if (prop in div.style) { Transition.cache[prop] = prop; } else { for (var i = 0; i < prefixes.length; ++i) { var vendorProp = prefixes[i] + prop_; if (vendorProp in div.style) { Transition.cache[prop] = vendorProp; break; } } } } return Transition.cache[prop]; }; /** * Get the name of the transition end event * * @static * @private * @return {string} description */ Transition.getTransitionEndEventName = function () { return Transition.transitionEndEventNames[Transition.getVendorPropertyName('transition')] || undefined; }; /** * Helper function for listening on transition end events * * @function H5P.Transition.onTransitionEnd * @static * @param {domElement} $element The element which is transitioned * @param {function} callback The callback to be invoked when transition is finished * @param {number} timeout Timeout in milliseconds. Fallback if transition event is never fired */ Transition.onTransitionEnd = function ($element, callback, timeout) { // Fallback on 1 second if transition event is not supported/triggered timeout = timeout || 1000; Transition.transitionEndEventName = Transition.transitionEndEventName || Transition.getTransitionEndEventName(); var callbackCalled = false; var doCallback = function () { if (callbackCalled) { return; } $element.off(Transition.transitionEndEventName, callback); callbackCalled = true; clearTimeout(timer); callback(); }; var timer = setTimeout(function () { doCallback(); }, timeout); $element.on(Transition.transitionEndEventName, function () { doCallback(); }); }; /** * Wait for a transition - when finished, invokes next in line * * @private * * @param {Object[]} transitions Array of transitions * @param {H5P.jQuery} transitions[].$element Dom element transition is performed on * @param {number=} transitions[].timeout Timeout fallback if transition end never is triggered * @param {bool=} transitions[].break If true, sequence breaks after this transition * @param {number} index The index for current transition */ var runSequence = function (transitions, index) { if (index >= transitions.length) { return; } var transition = transitions[index]; H5P.Transition.onTransitionEnd(transition.$element, function () { if (transition.end) { transition.end(); } if (transition.break !== true) { runSequence(transitions, index+1); } }, transition.timeout || undefined); }; /** * Run a sequence of transitions * * @function H5P.Transition.sequence * @static * @param {Object[]} transitions Array of transitions * @param {H5P.jQuery} transitions[].$element Dom element transition is performed on * @param {number=} transitions[].timeout Timeout fallback if transition end never is triggered * @param {bool=} transitions[].break If true, sequence breaks after this transition */ Transition.sequence = function (transitions) { runSequence(transitions, 0); }; return Transition; })(H5P.jQuery);
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