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import css from 'dom-helpers/css';
import { dataAttr } from './DataKey';
import getBodyScrollbarWidth from './getScrollbarWidth';
export const OPEN_DATA_ATTRIBUTE = dataAttr('modal-open');
/**
* Manages a stack of Modals as well as ensuring
* body scrolling is is disabled and padding accounted for
*/
class ModalManager {
constructor({
ownerDocument,
handleContainerOverflow = true,
isRTL = false
} = {}) {
this.handleContainerOverflow = handleContainerOverflow;
this.isRTL = isRTL;
this.modals = [];
this.ownerDocument = ownerDocument;
}
getScrollbarWidth() {
return getBodyScrollbarWidth(this.ownerDocument);
}
getElement() {
return (this.ownerDocument || document).body;
}
setModalAttributes(_modal) {
// For overriding
}
removeModalAttributes(_modal) {
// For overriding
}
setContainerStyle(containerState) {
const style = {
overflow: 'hidden'
};
// we are only interested in the actual `style` here
// because we will override it
const paddingProp = this.isRTL ? 'paddingLeft' : 'paddingRight';
const container = this.getElement();
containerState.style = {
overflow: container.style.overflow,
[paddingProp]: container.style[paddingProp]
};
if (containerState.scrollBarWidth) {
// use computed style, here to get the real padding
// to add our scrollbar width
style[paddingProp] = `${parseInt(css(container, paddingProp) || '0', 10) + containerState.scrollBarWidth}px`;
}
container.setAttribute(OPEN_DATA_ATTRIBUTE, '');
css(container, style);
}
reset() {
[...this.modals].forEach(m => this.remove(m));
}
removeContainerStyle(containerState) {
const container = this.getElement();
container.removeAttribute(OPEN_DATA_ATTRIBUTE);
Object.assign(container.style, containerState.style);
}
add(modal) {
let modalIdx = this.modals.indexOf(modal);
if (modalIdx !== -1) {
return modalIdx;
}
modalIdx = this.modals.length;
this.modals.push(modal);
this.setModalAttributes(modal);
if (modalIdx !== 0) {
return modalIdx;
}
this.state = {
scrollBarWidth: this.getScrollbarWidth(),
style: {}
};
if (this.handleContainerOverflow) {
this.setContainerStyle(this.state);
}
return modalIdx;
}
remove(modal) {
const modalIdx = this.modals.indexOf(modal);
if (modalIdx === -1) {
return;
}
this.modals.splice(modalIdx, 1);
// if that was the last modal in a container,
// clean up the container
if (!this.modals.length && this.handleContainerOverflow) {
this.removeContainerStyle(this.state);
}
this.removeModalAttributes(modal);
}
isTopModal(modal) {
return !!this.modals.length && this.modals[this.modals.length - 1] === modal;
}
}
export default ModalManager;