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structureSetup.elements.ts
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structureSetup.elements.ts
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import {
isHTMLElement,
appendChildren,
createDiv,
is,
contents,
insertAfter,
parent,
removeElements,
push,
runEachAndClear,
removeAttrs,
hasAttrClass,
addEventListener,
bind,
inArray,
addAttrClass,
addRemoveAttrClass,
setAttrs,
getAttr,
noop,
stopPropagation,
isBodyElement,
getFocusedElement,
} from '~/support';
import {
dataAttributeHost,
dataAttributeInitialize,
dataAttributeHostOverflowX,
dataAttributeHostOverflowY,
dataAttributeViewport,
dataValueViewportScrollbarHidden,
dataAttributePadding,
dataAttributeContent,
dataValueHostHtmlBody,
} from '~/classnames';
import { getEnvironment } from '~/environment';
import {
staticInitializationElement as generalStaticInitializationElement,
dynamicInitializationElement as generalDynamicInitializationElement,
} from '~/initialization';
import type {
InitializationTarget,
InitializationTargetElement,
InitializationTargetObject,
} from '~/initialization';
export type StructureSetupElements = [
elements: StructureSetupElementsObj,
appendElements: () => () => void,
canceled: () => void
];
export interface StructureSetupElementsObj {
_target: InitializationTargetElement;
_host: HTMLElement;
_viewport: HTMLElement;
_padding: HTMLElement | false;
_content: HTMLElement | false;
_scrollOffsetElement: HTMLElement;
_scrollEventElement: HTMLElement | Document;
_originalScrollOffsetElement: HTMLElement;
// ctx ----
_isTextarea: boolean;
_isBody: boolean;
_windowElm: Window;
_documentElm: Document;
_targetIsElm: boolean;
_viewportIsTarget: boolean;
_viewportHasClass: (viewportAttributeClassName: string) => boolean;
_viewportAddRemoveClass: (viewportAttributeClassName: string, add?: boolean) => void;
}
export const createStructureSetupElements = (
target: InitializationTarget
): StructureSetupElements => {
const env = getEnvironment();
const { _getDefaultInitialization, _nativeScrollbarsHiding } = env;
const { elements: defaultInitElements } = _getDefaultInitialization();
const {
host: defaultHostInitialization,
padding: defaultPaddingInitialization,
viewport: defaultViewportInitialization,
content: defaultContentInitialization,
} = defaultInitElements;
const targetIsElm = isHTMLElement(target);
const targetStructureInitialization = (targetIsElm ? {} : target) as InitializationTargetObject;
const { elements: initElements } = targetStructureInitialization;
const {
host: hostInitialization,
padding: paddingInitialization,
viewport: viewportInitialization,
content: contentInitialization,
} = initElements || {};
const targetElement = targetIsElm ? target : targetStructureInitialization.target;
const isBody = isBodyElement(targetElement);
const isTextarea = is(targetElement, 'textarea');
const ownerDocument = targetElement.ownerDocument;
const docElement = ownerDocument.documentElement;
const docWnd = ownerDocument.defaultView as Window;
const focusElm = (customActiveElm: Element | null) => {
if (customActiveElm && (customActiveElm as HTMLElement).focus) {
(customActiveElm as HTMLElement).focus();
}
};
const staticInitializationElement = bind(generalStaticInitializationElement, [targetElement]);
const dynamicInitializationElement = bind(generalDynamicInitializationElement, [targetElement]);
const createNewDiv = bind(createDiv, '');
const generateViewportElement = bind(
staticInitializationElement,
createNewDiv,
defaultViewportInitialization
);
const generateContentElement = bind(
dynamicInitializationElement,
createNewDiv,
defaultContentInitialization
);
const possibleViewportElement = generateViewportElement(viewportInitialization);
const viewportIsTarget = possibleViewportElement === targetElement;
const viewportIsTargetBody = viewportIsTarget && isBody;
const possibleContentElement = !viewportIsTarget && generateContentElement(contentInitialization);
// edge case if passed viewportElement is contentElement:
// viewport element has higher priority and content element will not be generated
// will act the same way as initialization: `{ elements: { viewport, content: false } }`
const viewportIsContent = !viewportIsTarget && possibleViewportElement === possibleContentElement;
const viewportElement = viewportIsTargetBody ? docElement : possibleViewportElement;
const nonBodyHostElement = isTextarea
? staticInitializationElement(createNewDiv, defaultHostInitialization, hostInitialization)
: (targetElement as HTMLElement);
const hostElement = viewportIsTargetBody ? viewportElement : nonBodyHostElement;
const paddingElement =
!viewportIsTarget &&
dynamicInitializationElement(createNewDiv, defaultPaddingInitialization, paddingInitialization);
const contentElement = !viewportIsContent && possibleContentElement;
const generatedElements = [contentElement, viewportElement, paddingElement, hostElement].map(
(elm) => isHTMLElement(elm) && !parent(elm) && elm
);
const elementIsGenerated = (elm: HTMLElement | false) => elm && inArray(generatedElements, elm);
const originalNonBodyScrollOffsetElement = elementIsGenerated(viewportElement)
? targetElement
: viewportElement;
const evaluatedTargetObj: StructureSetupElementsObj = {
_target: targetElement,
_host: hostElement,
_viewport: viewportElement,
_padding: paddingElement,
_content: contentElement,
_scrollOffsetElement: viewportIsTargetBody ? docElement : viewportElement,
_scrollEventElement: viewportIsTargetBody ? ownerDocument : viewportElement,
_originalScrollOffsetElement: isBody ? docElement : originalNonBodyScrollOffsetElement,
_windowElm: docWnd,
_documentElm: ownerDocument,
_isTextarea: isTextarea,
_isBody: isBody,
_targetIsElm: targetIsElm,
_viewportIsTarget: viewportIsTarget,
_viewportHasClass: (viewportAttributeClassName: string) =>
hasAttrClass(
viewportElement,
viewportIsTarget ? dataAttributeHost : dataAttributeViewport,
viewportAttributeClassName
),
_viewportAddRemoveClass: (viewportAttributeClassName: string, add?: boolean) =>
addRemoveAttrClass(
viewportElement,
viewportIsTarget ? dataAttributeHost : dataAttributeViewport,
viewportAttributeClassName,
add
),
};
const { _target, _host, _padding, _viewport, _content } = evaluatedTargetObj;
const destroyFns: (() => any)[] = [
() => {
// always remove dataAttributeHost & dataAttributeInitialize from host and from <html> element if target is body
removeAttrs(_host, [dataAttributeHost, dataAttributeInitialize]);
removeAttrs(_target, dataAttributeInitialize);
if (isBody) {
removeAttrs(docElement, [dataAttributeInitialize, dataAttributeHost]);
}
},
];
const isTextareaHostGenerated = isTextarea && elementIsGenerated(_host);
let targetContents = isTextarea
? _target
: contents(
[_content, _viewport, _padding, _host, _target].find(
(elm) => elm && !elementIsGenerated(elm)
)
);
const contentSlot = viewportIsTargetBody ? _target : _content || _viewport;
const destroy = bind(runEachAndClear, destroyFns);
const appendElements = () => {
const initActiveElm = getFocusedElement();
const unwrap = (elm: HTMLElement | false | null | undefined) => {
appendChildren(parent(elm), contents(elm));
removeElements(elm);
};
// wrapping / unwrapping will cause the focused element to blur, this should prevent those events to surface
const prepareWrapUnwrapFocus = (activeElement?: Element | null) =>
activeElement
? addEventListener(
activeElement,
'focusin focusout focus blur',
(event) => {
stopPropagation(event);
event.stopImmediatePropagation();
},
{
_capture: true,
_passive: false,
}
)
: noop;
const tabIndexStr = 'tabindex';
const ogTabindex = getAttr(_viewport, tabIndexStr);
const undoInitWrapUndwrapFocus = prepareWrapUnwrapFocus(initActiveElm);
setAttrs(_host, dataAttributeHost, viewportIsTarget ? 'viewport' : 'host');
setAttrs(_padding, dataAttributePadding, '');
setAttrs(_content, dataAttributeContent, '');
if (!viewportIsTarget) {
setAttrs(_viewport, dataAttributeViewport, '');
setAttrs(_viewport, tabIndexStr, ogTabindex || '-1');
isBody && addAttrClass(docElement, dataAttributeHost, dataValueHostHtmlBody);
}
// only insert host for textarea after target if it was generated
if (isTextareaHostGenerated) {
insertAfter(_target, _host);
push(destroyFns, () => {
insertAfter(_host, _target);
removeElements(_host);
});
}
appendChildren(contentSlot, targetContents);
appendChildren(_host, _padding);
appendChildren(_padding || _host, !viewportIsTarget && _viewport);
appendChildren(_viewport, _content);
push(destroyFns, [
undoInitWrapUndwrapFocus,
() => {
const destroyActiveElm = getFocusedElement();
const undoDestroyWrapUndwrapFocus = prepareWrapUnwrapFocus(destroyActiveElm);
removeAttrs(_padding, dataAttributePadding);
removeAttrs(_content, dataAttributeContent);
removeAttrs(_viewport, [
dataAttributeHostOverflowX,
dataAttributeHostOverflowY,
dataAttributeViewport,
]);
ogTabindex
? setAttrs(_viewport, tabIndexStr, ogTabindex)
: removeAttrs(_viewport, tabIndexStr);
elementIsGenerated(_content) && unwrap(_content);
elementIsGenerated(_viewport) && unwrap(_viewport);
elementIsGenerated(_padding) && unwrap(_padding);
focusElm(destroyActiveElm);
undoDestroyWrapUndwrapFocus();
},
]);
if (_nativeScrollbarsHiding && !viewportIsTarget) {
addAttrClass(_viewport, dataAttributeViewport, dataValueViewportScrollbarHidden);
push(destroyFns, bind(removeAttrs, _viewport, dataAttributeViewport));
}
// focus viewport if previously focused element was target, otherwise focus previously focused element
focusElm(
!viewportIsTarget && docWnd.top === docWnd && initActiveElm === targetElement
? _viewport
: initActiveElm
);
undoInitWrapUndwrapFocus();
// @ts-ignore
targetContents = 0;
return destroy;
};
return [evaluatedTargetObj, appendElements, destroy];
};