Function getActiveElementInfo

docs/app/js/sanddance-app.js:6723–6738

(container)

    }
}
function getActiveElementInfo(container) {
    let element = document.activeElement;
    const { scrollTop , selectionDirection , selectionEnd , selectionStart  } = element;
    const activeElementInfo = {
        childPositions: [],
        scrollTop,
        selectionDirection,
        selectionEnd,
        selectionStart
    };
    while(element && element !== document.body && element !== container){
        activeElementInfo.childPositions.unshift(getChildPosition(element));
        element = element.parentElement;
    }
    if ((element === document.body || element === container) && activeElementInfo.childPositions.length) return activeElementInfo;
}
function getChildPosition(element) {
    let childPosition = 0;
    while(element = element.previousElementSibling)childPosition++;