mirror of
https://github.com/codeninjasllc/codecombat.git
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132 lines
3.6 KiB
JavaScript
132 lines
3.6 KiB
JavaScript
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$(document).ready(function() {
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// https://github.com/NV/flying-focus
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if (document.getElementById('flying-focus')) return;
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var flyingFocus = document.createElement('flying-focus'); // use uniq element name to decrease the chances of a conflict with website styles
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flyingFocus.id = 'flying-focus';
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document.body.appendChild(flyingFocus);
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var DURATION = 100;
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flyingFocus.style.transitionDuration = flyingFocus.style.WebkitTransitionDuration = DURATION / 1000 + 's';
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function offsetOf(elem) {
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var rect = elem.getBoundingClientRect();
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var docElem = document.documentElement;
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var win = document.defaultView;
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var body = document.body;
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var clientTop = docElem.clientTop || body.clientTop || 0,
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clientLeft = docElem.clientLeft || body.clientLeft || 0,
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scrollTop = win.pageYOffset || docElem.scrollTop || body.scrollTop,
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scrollLeft = win.pageXOffset || docElem.scrollLeft || body.scrollLeft,
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top = rect.top + scrollTop - clientTop,
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left = rect.left + scrollLeft - clientLeft;
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return {top: top, left: left};
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}
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var movingId = 0;
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var prevFocused = null;
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var isFirstFocus = true;
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var keyDownTime = 0;
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document.documentElement.addEventListener('keydown', function(event) {
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var code = event.which;
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// Show animation only upon Tab or Arrow keys press.
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if (code === 9 || (code > 36 && code < 41)) {
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keyDownTime = now();
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}
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}, false);
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document.documentElement.addEventListener('focus', function(event) {
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var target = event.target;
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if (target.id === 'flying-focus') {
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return;
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}
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var offset = offsetOf(target);
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flyingFocus.style.left = offset.left + 'px';
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flyingFocus.style.top = offset.top + 'px';
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flyingFocus.style.width = target.offsetWidth + 'px';
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flyingFocus.style.height = target.offsetHeight + 'px';
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// Would be nice to use:
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//
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// flyingFocus.style['outline-offset'] = getComputedStyle(target, null)['outline-offset']
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//
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// but it always '0px' in WebKit and Blink for some reason :(
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if (isFirstFocus) {
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isFirstFocus = false;
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return;
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}
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if (now() - keyDownTime > 42) {
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return;
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}
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onEnd();
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target.classList.add('flying-focus_target');
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flyingFocus.classList.add('flying-focus_visible');
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prevFocused = target;
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movingId = setTimeout(onEnd, DURATION);
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}, true);
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document.documentElement.addEventListener('blur', function() {
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onEnd();
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}, true);
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function onEnd() {
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if (!movingId) {
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return;
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}
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clearTimeout(movingId);
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movingId = 0;
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flyingFocus.classList.remove('flying-focus_visible');
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prevFocused.classList.remove('flying-focus_target');
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prevFocused = null;
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}
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function now() {
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return new Date().valueOf();
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}
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var style = document.createElement('style');
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style.textContent = "#flying-focus {\
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position: absolute;\
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margin: 0;\
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background: transparent;\
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-webkit-transition-property: left, top, width, height, opacity;\
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transition-property: left, top, width, height, opacity;\
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-webkit-transition-timing-function: cubic-bezier(0, 0.2, 0, 1);\
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transition-timing-function: cubic-bezier(0, 0.2, 0, 1);\
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visibility: hidden;\
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pointer-events: none;\
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box-shadow: 0 0 2px 3px #78aeda, 0 0 2px #78aeda inset; border-radius: 2px;\
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}\
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#flying-focus.flying-focus_visible {\
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visibility: visible;\
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z-index: 9999;\
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}\
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.flying-focus_target {\
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outline: none !important; /* Doesn't work in Firefox :( */\
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}\
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/* http://stackoverflow.com/questions/71074/how-to-remove-firefoxs-dotted-outline-on-buttons-as-well-as-links/199319 */\
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.flying-focus_target::-moz-focus-inner {\
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border: 0 !important;\
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}\
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/* Replace it with @supports rule when browsers catch up */\
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@media screen and (-webkit-min-device-pixel-ratio: 0) {\
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#flying-focus {\
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box-shadow: none;\
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outline: 5px auto -webkit-focus-ring-color;\
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outline-offset: -3px;\
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}\
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}\
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";
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document.body.appendChild(style);
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});
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