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useRichTextFormatting.js
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useRichTextFormatting.js
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/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* External dependencies
*/
import { useMemo, useCallback } from 'react';
/**
* Internal dependencies
*/
import useRichText from '../../richText/useRichText';
import {
getHTMLInfo,
toggleBoldInHTML,
setFontWeightInHTML,
toggleItalicInHTML,
toggleUnderlineInHTML,
} from '../../richText/htmlManipulation';
import { MULTIPLE_VALUE } from '../../form';
function reduceWithMultiple(reduced, info) {
return Object.fromEntries(
Object.keys(info).map((key) => {
const wasMultiple = reduced[key] === MULTIPLE_VALUE;
const hadValue = typeof reduced[key] !== 'undefined';
const areDifferent = hadValue && reduced[key] !== info[key];
if (wasMultiple || areDifferent) {
return [key, MULTIPLE_VALUE];
}
return [key, info[key]];
})
);
}
function useRichTextFormatting(selectedElements, pushUpdate) {
const {
state: { hasCurrentEditor, selectionInfo },
actions: {
toggleBoldInSelection,
setFontWeightInSelection,
toggleItalicInSelection,
toggleUnderlineInSelection,
},
} = useRichText();
const textInfo = useMemo(() => {
if (hasCurrentEditor) {
return selectionInfo;
}
// loop over all elements, find info for content and reduce to common value
// (setting MULTIPLE_VALUE appropriately)
return selectedElements
.map(({ content }) => content)
.map(getHTMLInfo)
.reduce(reduceWithMultiple, {});
}, [hasCurrentEditor, selectionInfo, selectedElements]);
const push = useCallback(
(updater, ...args) =>
pushUpdate(
({ content }) => ({ content: updater(content, ...args) }),
true
),
[pushUpdate]
);
const handlers = useMemo(() => {
if (hasCurrentEditor) {
return {
handleClickBold: toggleBoldInSelection,
handleSelectFontWeight: setFontWeightInSelection,
handleClickItalic: toggleItalicInSelection,
handleClickUnderline: toggleUnderlineInSelection,
};
}
return {
handleClickBold: (flag) => push(toggleBoldInHTML, flag),
handleSelectFontWeight: (weight) => push(setFontWeightInHTML, weight),
handleClickItalic: (flag) => push(toggleItalicInHTML, flag),
handleClickUnderline: (flag) => push(toggleUnderlineInHTML, flag),
};
}, [
hasCurrentEditor,
toggleBoldInSelection,
setFontWeightInSelection,
toggleItalicInSelection,
toggleUnderlineInSelection,
push,
]);
return {
textInfo,
handlers,
};
}
export default useRichTextFormatting;