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feat(keyboard): move cursor and delete content in contenteditable (#822)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| import {isContentEditable, isElementType} from '..' | ||
|
|
||
| declare global { | ||
| interface Text { | ||
| nodeValue: string | ||
| } | ||
| } | ||
|
|
||
| export function getNextCursorPosition( | ||
| node: Node, | ||
| offset: number, | ||
| direction: -1 | 1, | ||
| inputType?: string, | ||
| ): | ||
| | { | ||
| node: Node | ||
| offset: number | ||
| } | ||
| | undefined { | ||
| // The behavior at text node zero offset is inconsistent. | ||
| // When walking backwards: | ||
| // Firefox always moves to zero offset and jumps over last offset. | ||
| // Chrome jumps over zero offset per default but over last offset when Shift is pressed. | ||
| // The cursor always moves to zero offset if the focus area (contenteditable or body) ends there. | ||
| // When walking foward both ignore zero offset. | ||
| // When walking over input elements the cursor moves before or after that element. | ||
| // When walking over line breaks the cursor moves inside any following text node. | ||
|
|
||
| if ( | ||
| isTextNode(node) && | ||
| offset + direction >= 0 && | ||
| offset + direction <= node.nodeValue.length | ||
| ) { | ||
| return {node, offset: offset + direction} | ||
| } | ||
| const nextNode = getNextCharacterContentNode(node, offset, direction) | ||
| if (nextNode) { | ||
| if (isTextNode(nextNode)) { | ||
| return { | ||
| node: nextNode, | ||
| offset: | ||
| direction > 0 | ||
| ? Math.min(1, nextNode.nodeValue.length) | ||
| : Math.max(nextNode.nodeValue.length - 1, 0), | ||
| } | ||
| } else if (isElementType(nextNode, 'br')) { | ||
| const nextPlusOne = getNextCharacterContentNode( | ||
| nextNode, | ||
| undefined, | ||
| direction, | ||
| ) | ||
| if (!nextPlusOne) { | ||
| // The behavior when there is no possible cursor position beyond the line break is inconsistent. | ||
| // In Chrome outside of contenteditable moving before a leading line break is possible. | ||
| // A leading line break can still be removed per deleteContentBackward. | ||
| // A trailing line break on the other hand is not removed by deleteContentForward. | ||
| if (direction < 0 && inputType === 'deleteContentBackward') { | ||
| return { | ||
| node: nextNode.parentNode as Node, | ||
| offset: getOffset(nextNode), | ||
| } | ||
| } | ||
| return undefined | ||
| } else if (isTextNode(nextPlusOne)) { | ||
| return { | ||
| node: nextPlusOne, | ||
| offset: direction > 0 ? 0 : nextPlusOne.nodeValue.length, | ||
| } | ||
| } else if (direction < 0 && isElementType(nextPlusOne, 'br')) { | ||
| return { | ||
| node: nextNode.parentNode as Node, | ||
| offset: getOffset(nextNode), | ||
| } | ||
| } else { | ||
| return { | ||
| node: nextPlusOne.parentNode as Node, | ||
| offset: getOffset(nextPlusOne) + (direction > 0 ? 0 : 1), | ||
| } | ||
| } | ||
| } else { | ||
| return { | ||
| node: nextNode.parentNode as Node, | ||
| offset: getOffset(nextNode) + (direction > 0 ? 1 : 0), | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| function getNextCharacterContentNode( | ||
| node: Node, | ||
| offset: number | undefined, | ||
| direction: -1 | 1, | ||
| ) { | ||
| const nextOffset = Number(offset) + (direction < 0 ? -1 : 0) | ||
| if ( | ||
| offset !== undefined && | ||
| isElement(node) && | ||
| nextOffset >= 0 && | ||
| nextOffset < node.children.length | ||
| ) { | ||
| node = node.children[nextOffset] | ||
| } | ||
| return walkNodes( | ||
| node, | ||
| direction === 1 ? 'next' : 'previous', | ||
| isTreatedAsCharacterContent, | ||
| ) | ||
| } | ||
|
|
||
| function isTreatedAsCharacterContent(node: Node): node is Text | HTMLElement { | ||
| if (isTextNode(node)) { | ||
| return true | ||
| } | ||
| if (isElement(node)) { | ||
| if (isElementType(node, ['input', 'textarea'])) { | ||
| return (node as HTMLInputElement).type !== 'hidden' | ||
| } else if (isElementType(node, 'br')) { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| function getOffset(node: Node) { | ||
| let i = 0 | ||
| while (node.previousSibling) { | ||
| i++ | ||
| node = node.previousSibling | ||
| } | ||
| return i | ||
| } | ||
|
|
||
| function isElement(node: Node): node is Element { | ||
| return node.nodeType === 1 | ||
| } | ||
|
|
||
| function isTextNode(node: Node): node is Text { | ||
| return node.nodeType === 3 | ||
| } | ||
|
|
||
| function walkNodes<T extends Node>( | ||
| node: Node, | ||
| direction: 'previous' | 'next', | ||
| callback: (node: Node) => node is T, | ||
| ) { | ||
| for (;;) { | ||
| const sibling = node[`${direction}Sibling`] | ||
| if (sibling) { | ||
| node = getDescendant(sibling, direction === 'next' ? 'first' : 'last') | ||
| if (callback(node)) { | ||
| return node | ||
| } | ||
| } else if ( | ||
| node.parentNode && | ||
| (!isElement(node.parentNode) || | ||
| (!isContentEditable(node.parentNode) && | ||
| node.parentNode !== node.ownerDocument?.body)) | ||
| ) { | ||
| node = node.parentNode | ||
| } else { | ||
| break | ||
| } | ||
| } | ||
| } | ||
|
|
||
| function getDescendant(node: Node, direction: 'first' | 'last') { | ||
| while (node.hasChildNodes()) { | ||
| node = node[`${direction}Child`] as ChildNode | ||
| } | ||
| return node | ||
| } |
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