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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\nimport {AriaTextFieldProps} from '@react-types/textfield';\nimport {mergeProps, useEffectEvent} from '@react-aria/utils';\nimport {RefObject} from '@react-types/shared';\nimport {TextFieldAria, useTextField} from './useTextField';\nimport {useEffect, useRef} from 'react';\n\ninterface FormattedTextFieldState {\n validate: (val: string) => boolean,\n setInputValue: (val: string) => void\n}\n\n\nfunction supportsNativeBeforeInputEvent() {\n return typeof window !== 'undefined' &&\n window.InputEvent &&\n typeof InputEvent.prototype.getTargetRanges === 'function';\n}\n\nexport function useFormattedTextField(props: AriaTextFieldProps, state: FormattedTextFieldState, inputRef: RefObject<HTMLInputElement | null>): TextFieldAria {\n // All browsers implement the 'beforeinput' event natively except Firefox\n // (currently behind a flag as of Firefox 84). React's polyfill does not\n // run in all cases that the native event fires, e.g. when deleting text.\n // Use the native event if available so that we can prevent invalid deletions.\n // We do not attempt to polyfill this in Firefox since it would be very complicated,\n // the benefit of doing so is fairly minor, and it's going to be natively supported soon.\n let onBeforeInputFallback = useEffectEvent((e: InputEvent) => {\n let input = inputRef.current;\n if (!input) {\n return;\n }\n\n // Compute the next value of the input if the event is allowed to proceed.\n // See https://www.w3.org/TR/input-events-2/#interface-InputEvent-Attributes for a full list of input types.\n let nextValue: string | null = null;\n switch (e.inputType) {\n case 'historyUndo':\n case 'historyRedo':\n // Explicitly allow undo/redo. e.data is null in this case, but there's no need to validate,\n // because presumably the input would have already been validated previously.\n return;\n case 'insertLineBreak':\n // Explicitly allow \"insertLineBreak\" event, to allow onSubmit for \"enter\" key. e.data is null in this case.\n return;\n case 'deleteContent':\n case 'deleteByCut':\n case 'deleteByDrag':\n nextValue = input.value.slice(0, input.selectionStart!) + input.value.slice(input.selectionEnd!);\n break;\n case 'deleteContentForward':\n // This is potentially incorrect, since the browser may actually delete more than a single UTF-16\n // character. In reality, a full Unicode grapheme cluster consisting of multiple UTF-16 characters\n // or code points may be deleted. However, in our currently supported locales, there are no such cases.\n // If we support additional locales in the future, this may need to change.\n nextValue = input.selectionEnd === input.selectionStart\n ? input.value.slice(0, input.selectionStart!) + input.value.slice(input.selectionEnd! + 1)\n : input.value.slice(0, input.selectionStart!) + input.value.slice(input.selectionEnd!);\n break;\n case 'deleteContentBackward':\n nextValue = input.selectionEnd === input.selectionStart\n ? input.value.slice(0, input.selectionStart! - 1) + input.value.slice(input.selectionStart!)\n : input.value.slice(0, input.selectionStart!) + input.value.slice(input.selectionEnd!);\n break;\n case 'deleteSoftLineBackward':\n case 'deleteHardLineBackward':\n nextValue = input.value.slice(input.selectionStart!);\n break;\n default:\n if (e.data != null) {\n nextValue =\n input.value.slice(0, input.selectionStart!) +\n e.data +\n input.value.slice(input.selectionEnd!);\n }\n break;\n }\n\n // If we did not compute a value, or the new value is invalid, prevent the event\n // so that the browser does not update the input text, move the selection, or add to\n // the undo/redo stack.\n if (nextValue == null || !state.validate(nextValue)) {\n e.preventDefault();\n }\n });\n\n useEffect(() => {\n if (!supportsNativeBeforeInputEvent() || !inputRef.current) {\n return;\n }\n\n let input = inputRef.current;\n input.addEventListener('beforeinput', onBeforeInputFallback, false);\n return () => {\n input.removeEventListener('beforeinput', onBeforeInputFallback, false);\n };\n }, [inputRef, onBeforeInputFallback]);\n\n let onBeforeInput = !supportsNativeBeforeInputEvent()\n ? e => {\n let nextValue =\n e.target.value.slice(0, e.target.selectionStart) +\n e.data +\n e.target.value.slice(e.target.selectionEnd);\n\n if (!state.validate(nextValue)) {\n e.preventDefault();\n }\n }\n : null;\n\n let {labelProps, inputProps: textFieldProps, descriptionProps, errorMessageProps, ...validation} = useTextField(props, inputRef);\n\n let compositionStartState = useRef<{value: string, selectionStart: number | null, selectionEnd: number | null} | null>(null);\n return {\n inputProps: mergeProps(\n textFieldProps,\n {\n onBeforeInput,\n onCompositionStart() {\n // Chrome does not implement Input Events Level 2, which specifies the insertFromComposition\n // and deleteByComposition inputType values for the beforeinput event. These are meant to occur\n // at the end of a composition (e.g. Pinyin IME, Android auto correct, etc.), and crucially, are\n // cancelable. The insertCompositionText and deleteCompositionText input types are not cancelable,\n // nor would we want to cancel them because the input from the user is incomplete at that point.\n // In Safari, insertFromComposition/deleteFromComposition will fire, however, allowing us to cancel\n // the final composition result if it is invalid. As a fallback for Chrome and Firefox, which either\n // don't support Input Events Level 2, or beforeinput at all, we store the state of the input when\n // the compositionstart event fires, and undo the changes in compositionend (below) if it is invalid.\n // Unfortunately, this messes up the undo/redo stack, but until insertFromComposition/deleteByComposition\n // are implemented, there is no other way to prevent composed input.\n // See https://bugs.chromium.org/p/chromium/issues/detail?id=1022204\n let {value, selectionStart, selectionEnd} = inputRef.current!;\n compositionStartState.current = {value, selectionStart, selectionEnd};\n },\n onCompositionEnd() {\n if (inputRef.current && !state.validate(inputRef.current.value)) {\n // Restore the input value in the DOM immediately so we can synchronously update the selection position.\n // But also update the value in React state as well so it is correct for future updates.\n let {value, selectionStart, selectionEnd} = compositionStartState.current!;\n inputRef.current.value = value;\n inputRef.current.setSelectionRange(selectionStart, selectionEnd);\n state.setInputValue(value);\n }\n }\n }\n ),\n labelProps,\n descriptionProps,\n errorMessageProps,\n ...validation\n };\n}\n"],"names":[],"version":3,"file":"useFormattedTextField.module.js.map"} |