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selection.ts
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selection.ts
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import {isElementType} from '../misc/isElementType'
import {getUISelection, setUISelection, UISelectionRange} from '../../document'
import {editableInputTypes} from '../edit/isEditable'
import {isContentEditable, getContentEditable} from '../edit/isContentEditable'
import {getNextCursorPosition} from './cursor'
/**
* Backward-compatible selection.
*
* Handles input elements and contenteditable if it only contains a single text node.
*/
export function setSelectionRange(
element: Element,
anchorOffset: number,
focusOffset: number,
) {
if (hasOwnSelection(element)) {
return setSelection({
focusNode: element,
anchorOffset,
focusOffset,
})
}
/* istanbul ignore else */
if (isContentEditable(element) && element.firstChild?.nodeType === 3) {
return setSelection({
focusNode: element.firstChild,
anchorOffset,
focusOffset,
})
}
/* istanbul ignore next */
throw new Error(
'Not implemented. The result of this interaction is unreliable.',
)
}
/**
* Determine if the element has its own selection implementation
* and does not interact with the Document Selection API.
*/
export function hasOwnSelection(
node: Node,
): node is
| HTMLTextAreaElement
| (HTMLInputElement & {type: editableInputTypes}) {
return (
isElement(node) &&
(isElementType(node, 'textarea') ||
(isElementType(node, 'input') && node.type in editableInputTypes))
)
}
function isElement(node: Node): node is Element {
return node.nodeType === 1
}
/**
* Determine which selection logic and selection ranges to consider.
*/
function getTargetTypeAndSelection(node: Node) {
const element = getElement(node)
if (element && hasOwnSelection(element)) {
return {
type: 'input',
selection: getUISelection(element),
} as const
}
const selection = element?.ownerDocument.getSelection()
// It is possible to extend a single-range selection into a contenteditable.
// This results in the range acting like a range outside of contenteditable.
const isCE =
getContentEditable(node) &&
selection?.anchorNode &&
getContentEditable(selection.anchorNode)
return {
type: isCE ? 'contenteditable' : 'default',
selection,
} as const
}
function getElement(node: Node) {
return node.nodeType === 1 ? (node as Element) : node.parentElement
}
/**
* Reset the Document Selection when moving focus into an element
* with own selection implementation.
*/
export function updateSelectionOnFocus(element: Element) {
const selection = element.ownerDocument.getSelection()
/* istanbul ignore if */
if (!selection?.focusNode) {
return
}
// If the focus moves inside an element with own selection implementation,
// the document selection will be this element.
// But if the focused element is inside a contenteditable,
// 1) a collapsed selection will be retained.
// 2) other selections will be replaced by a cursor
// 2.a) at the start of the first child if it is a text node
// 2.b) at the start of the contenteditable.
if (hasOwnSelection(element)) {
const contenteditable = getContentEditable(selection.focusNode)
if (contenteditable) {
if (!selection.isCollapsed) {
const focusNode =
contenteditable.firstChild?.nodeType === 3
? contenteditable.firstChild
: contenteditable
selection.setBaseAndExtent(focusNode, 0, focusNode, 0)
}
} else {
selection.setBaseAndExtent(element, 0, element, 0)
}
}
}
/**
* Get the range that would be overwritten by input.
*/
export function getInputRange(
focusNode: Node,
): UISelectionRange | Range | undefined {
const typeAndSelection = getTargetTypeAndSelection(focusNode)
if (typeAndSelection.type === 'input') {
return typeAndSelection.selection
} else if (typeAndSelection.type === 'contenteditable') {
// Multi-range on contenteditable edits the first selection instead of the last
return typeAndSelection.selection?.getRangeAt(0)
}
}
/**
* Extend/shrink the selection like with Shift+Arrows or Shift+Mouse
*/
export function modifySelection({
focusNode,
focusOffset,
}: {
focusNode: Node
/** DOM Offset */
focusOffset: number
}) {
const typeAndSelection = getTargetTypeAndSelection(focusNode)
if (typeAndSelection.type === 'input') {
return setUISelection(
focusNode as HTMLInputElement,
{
anchorOffset: typeAndSelection.selection.anchorOffset,
focusOffset,
},
'modify',
)
}
focusNode.ownerDocument?.getSelection()?.extend(focusNode, focusOffset)
}
/**
* Set the selection
*/
export function setSelection({
focusNode,
focusOffset,
anchorNode = focusNode,
anchorOffset = focusOffset,
}: {
anchorNode?: Node
/** DOM offset */
anchorOffset?: number
focusNode: Node
focusOffset: number
}) {
const typeAndSelection = getTargetTypeAndSelection(focusNode)
if (typeAndSelection.type === 'input') {
return setUISelection(focusNode as HTMLInputElement, {
anchorOffset,
focusOffset,
})
}
anchorNode.ownerDocument
?.getSelection()
?.setBaseAndExtent(anchorNode, anchorOffset, focusNode, focusOffset)
}
/**
* Move the selection
*/
export function moveSelection(node: Element, direction: -1 | 1) {
// TODO: implement shift
if (hasOwnSelection(node)) {
const selection = getUISelection(node)
setSelection({
focusNode: node,
focusOffset:
selection.startOffset === selection.endOffset
? selection.focusOffset + direction
: direction < 0
? selection.startOffset
: selection.endOffset,
})
} else {
const selection = node.ownerDocument.getSelection()
if (!selection?.focusNode) {
return
}
if (selection.isCollapsed) {
const nextPosition = getNextCursorPosition(
selection.focusNode,
selection.focusOffset,
direction,
)
if (nextPosition) {
setSelection({
focusNode: nextPosition.node,
focusOffset: nextPosition.offset,
})
}
} else {
selection[direction < 0 ? 'collapseToStart' : 'collapseToEnd']()
}
}
}