45 lines
1.8 KiB
JavaScript
45 lines
1.8 KiB
JavaScript
// weak
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import keycode from 'keycode';
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import warning from 'warning';
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import contains from 'dom-helpers/query/contains';
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import ownerDocument from 'dom-helpers/ownerDocument';
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const internal = {
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focusKeyPressed: false,
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keyUpEventTimeout: -1
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};
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export function detectFocusVisible(instance, element, callback, attempt = 1) {
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process.env.NODE_ENV !== "production" ? warning(instance.focusVisibleCheckTime, 'Material-UI: missing instance.focusVisibleCheckTime') : void 0;
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process.env.NODE_ENV !== "production" ? warning(instance.focusVisibleMaxCheckTimes, 'Material-UI: missing instance.focusVisibleMaxCheckTimes') : void 0;
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instance.focusVisibleTimeout = setTimeout(() => {
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const doc = ownerDocument(element);
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if (internal.focusKeyPressed && (doc.activeElement === element || contains(element, doc.activeElement))) {
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callback();
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} else if (attempt < instance.focusVisibleMaxCheckTimes) {
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detectFocusVisible(instance, element, callback, attempt + 1);
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}
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}, instance.focusVisibleCheckTime);
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}
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const FOCUS_KEYS = ['tab', 'enter', 'space', 'esc', 'up', 'down', 'left', 'right'];
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function isFocusKey(event) {
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return FOCUS_KEYS.indexOf(keycode(event)) !== -1;
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}
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const handleKeyUpEvent = event => {
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if (isFocusKey(event)) {
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internal.focusKeyPressed = true; // Let's consider that the user is using a keyboard during a window frame of 1s.
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clearTimeout(internal.keyUpEventTimeout);
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internal.keyUpEventTimeout = setTimeout(() => {
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internal.focusKeyPressed = false;
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}, 1e3);
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}
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};
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export function listenForFocusKeys(win) {
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// The event listener will only be added once per window.
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// Duplicate event listeners will be ignored by addEventListener.
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// Also, this logic is client side only, we don't need a teardown.
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win.addEventListener('keyup', handleKeyUpEvent);
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} |