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import {
getColor,
getRangesByText,
isBlockElement,
isNodeOfType,
parseValueWithUnit,
toArray,
} from 'roosterjs-content-model-dom';
import type {
ContentModelSegmentFormat,
DarkColorHandler,
DOMHelper,
} from 'roosterjs-content-model-types';
interface SelectionWithComposedRanges extends Selection {
getComposedRanges(options: { shadowRoots: ShadowRoot[] }): StaticRange[];
}
function isSelectionWithComposedRanges(sel: Selection): sel is SelectionWithComposedRanges {
return 'getComposedRanges' in sel;
}
function isShadowRoot(node: Node): node is ShadowRoot {
return 'host' in node;
}
/**
* @internal
*/
export interface DOMHelperImplOption {
/**
* @deprecated This is always treated as true now
*/
cloneIndependentRoot?: boolean;
/**
* When true, enable shadow root detection so the editor works inside a Shadow DOM.
*/
useShadowDom?: boolean;
}
class DOMHelperImpl implements DOMHelper {
private shadowRoot: ShadowRoot | null;
private doc: Document;
private useComposedRanges: boolean;
constructor(private contentDiv: HTMLElement, options?: DOMHelperImplOption) {
const rootNode = contentDiv.getRootNode();
this.shadowRoot = options?.useShadowDom && isShadowRoot(rootNode) ? rootNode : null;
this.doc = contentDiv.ownerDocument;
const sel = this.doc.defaultView?.getSelection();
this.useComposedRanges = !!(this.shadowRoot && sel && 'getComposedRanges' in sel);
}
queryElements(selector: string): HTMLElement[] {
return toArray(this.contentDiv.querySelectorAll(selector)) as HTMLElement[];
}
getTextContent(): string {
return this.contentDiv.textContent || '';
}
isNodeInEditor(node: Node, excludeRoot?: boolean): boolean {
return excludeRoot && node == this.contentDiv ? false : this.contentDiv.contains(node);
}
calculateZoomScale(): number {
const originalWidth = this.contentDiv.getBoundingClientRect()?.width || 0;
const visualWidth = this.contentDiv.offsetWidth;
return visualWidth > 0 && originalWidth > 0
? Math.round((originalWidth / visualWidth) * 100) / 100
: 1;
}
setDomAttribute(name: string, value: string | null) {
if (value === null) {
this.contentDiv.removeAttribute(name);
} else {
this.contentDiv.setAttribute(name, value);
}
}
getDomAttribute(name: string): string | null {
return this.contentDiv.getAttribute(name);
}
getDomStyle<T extends keyof CSSStyleDeclaration>(style: T): CSSStyleDeclaration[T] {
return this.contentDiv.style[style];
}
findClosestElementAncestor(startFrom: Node, selector?: string): HTMLElement | null {
const startElement = isNodeOfType(startFrom, 'ELEMENT_NODE')
? startFrom
: startFrom.parentElement;
const closestElement = selector
? (startElement?.closest(selector) as HTMLElement | null)
: startElement;
return closestElement &&
this.isNodeInEditor(closestElement) &&
closestElement != this.contentDiv
? closestElement
: null;
}
/**
* Find the closest block element ancestor from the given node within current editing scope
* @param startFrom The node to start the search from
* @returns The closest block element ancestor
*/
findClosestBlockElement(startFrom: Node): HTMLElement {
let node: Node | null = startFrom;
while (node && this.isNodeInEditor(node)) {
if (isNodeOfType(node, 'ELEMENT_NODE') && isBlockElement(node)) {
return node;
}
node = node.parentElement;
}
return this.contentDiv;
}
hasFocus(): boolean {
const activeElement = this.shadowRoot
? this.shadowRoot.activeElement
: this.doc.activeElement;
return !!(activeElement && this.contentDiv.contains(activeElement));
}
/**
* Check if the root element is in RTL mode
*/
isRightToLeft(): boolean {
const contentDiv = this.contentDiv;
const style = contentDiv.ownerDocument.defaultView?.getComputedStyle(contentDiv);
return style?.direction == 'rtl';
}
/**
* Get the width of the editable area of the editor content div
*/
getClientWidth(): number {
const contentDiv = this.contentDiv;
const style = contentDiv.ownerDocument.defaultView?.getComputedStyle(contentDiv);
const paddingLeft = parseValueWithUnit(style?.paddingLeft);
const paddingRight = parseValueWithUnit(style?.paddingRight);
return this.contentDiv.clientWidth - (paddingLeft + paddingRight);
}
/**
* Get a deep cloned root element
*/
getClonedRoot(): HTMLElement {
const doc = this.contentDiv.ownerDocument.implementation.createHTMLDocument();
const clone = doc.importNode(this.contentDiv, true /*deep*/);
return clone;
}
/**
* Get format of the container element
* @param isInDarkMode Optional flag to indicate if the environment is in dark mode
* @param darkColorHandler Optional DarkColorHandler to retrieve dark mode colors
*/
getContainerFormat(
isInDarkMode?: boolean,
darkColorHandler?: DarkColorHandler
): ContentModelSegmentFormat {
const window = this.contentDiv.ownerDocument.defaultView;
const style = window?.getComputedStyle(this.contentDiv);
return style
? {
fontSize: style.fontSize,
fontFamily: style.fontFamily,
fontWeight: style.fontWeight,
textColor: getColor(
this.contentDiv,
false /*isBackgroundColor*/,
!!isInDarkMode,
darkColorHandler,
style.color
),
backgroundColor: getColor(
this.contentDiv,
true /*isBackgroundColor*/,
!!isInDarkMode,
darkColorHandler,
style.backgroundColor
),
italic: style.fontStyle == 'italic',
letterSpacing: style.letterSpacing,
lineHeight: style.lineHeight,
strikethrough: style.textDecoration?.includes('line-through'),
superOrSubScriptSequence: style.verticalAlign,
underline: style.textDecoration?.includes('underline'),
}
: {};
}
/**
* Get text ranges by searching for a specific text, with options to match case and whole word.
* This will only search within editable elements.
* @param text The text to search for
* @param matchCase Whether to match case
* @param wholeWord Whether to match whole word
* @returns An array of Ranges that match the search criteria
*/
getRangesByText(text: string, matchCase: boolean, wholeWord: boolean): Range[] {
return getRangesByText(this.contentDiv, text, matchCase, wholeWord, true /*editableOnly*/);
}
getSelectionRange(): Range | null {
const sel = this.doc.defaultView?.getSelection();
if (!sel) {
return null;
}
Iif (this.useComposedRanges && this.shadowRoot && isSelectionWithComposedRanges(sel)) {
const staticRanges = sel.getComposedRanges({
shadowRoots: [this.shadowRoot],
});
if (staticRanges?.length > 0) {
const sr = staticRanges[0];
const range = this.doc.createRange();
range.setStart(sr.startContainer, sr.startOffset);
range.setEnd(sr.endContainer, sr.endOffset);
return range;
}
return null;
}
return sel.rangeCount > 0 ? sel.getRangeAt(0) : null;
}
setSelectionRange(range: Range, isReverted: boolean = false): void {
const sel = this.doc.defaultView?.getSelection();
const currentRange = this.getSelectionRange();
if (!sel || (currentRange && areSameRanges(range, currentRange))) {
return;
}
const { startContainer, startOffset, endContainer, endOffset } = range;
if (!isReverted) {
sel.setBaseAndExtent(startContainer, startOffset, endContainer, endOffset);
} else {
sel.setBaseAndExtent(endContainer, endOffset, startContainer, startOffset);
}
}
appendToRoot(element: HTMLElement): void {
if (this.shadowRoot) {
this.shadowRoot.appendChild(element);
} else {
this.doc.body.appendChild(element);
}
}
}
/**
* @internal Create new instance of DOMHelper
*/
export function createDOMHelper(
contentDiv: HTMLElement,
options: DOMHelperImplOption = {}
): DOMHelper {
return new DOMHelperImpl(contentDiv, options);
}
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