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[CP Stag] Fix pasting text into main composer #39177

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36 changes: 35 additions & 1 deletion src/hooks/useHtmlPaste/index.ts
Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,35 @@ import ExpensiMark from 'expensify-common/lib/ExpensiMark';
import {useCallback, useEffect} from 'react';
import type UseHtmlPaste from './types';

const insertByCommand = (text: string) => {
document.execCommand('insertText', false, text);
};

function insertAtCaret(target: HTMLElement, text: string) {
const selection = window.getSelection();
if (selection?.rangeCount) {
const range = selection.getRangeAt(0);
range.deleteContents();
const node = document.createTextNode(text);
range.insertNode(node);

// Move caret to the end of the newly inserted text node.
range.setStart(node, node.length);
range.setEnd(node, node.length);
selection.removeAllRanges();
selection.addRange(range);

// Dispatch input event to trigger Markdown Input to parse the new text
target.dispatchEvent(
new Event('input', {
bubbles: true,
}),
);
} else {
insertByCommand(text);
}
}

const useHtmlPaste: UseHtmlPaste = (textInputRef, preHtmlPasteCallback, removeListenerOnScreenBlur = false) => {
const navigation = useNavigation();

Expand All @@ -12,7 +41,12 @@ const useHtmlPaste: UseHtmlPaste = (textInputRef, preHtmlPasteCallback, removeLi
*/
const paste = useCallback((text: string) => {
try {
document.execCommand('insertText', false, text);
const textInputHTMLElement = textInputRef.current as HTMLElement;
if (textInputHTMLElement?.hasAttribute('contenteditable')) {
insertAtCaret(textInputHTMLElement, text);
} else {
insertByCommand(text);
}

// Pointer will go out of sight when a large paragraph is pasted on the web. Refocusing the input keeps the cursor in view.
textInputRef.current?.blur();
Expand Down
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