wiki/list-editor/cursor.js

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JavaScript
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2020-10-14 21:43:52 +00:00
function createCursor(start) {
let cursor = start;
return {
get() {
return cursor;
},
set(newPosition) {
cursor = newPosition;
},
getId(store) {
return store.currentID(cursor)
},
atFirst() {
return cursor === 0;
},
atPosition(other) {
return cursor === other;
},
atEnd(store) {
return cursor === store.length()
},
hasMoved(saved) {
return cursor !== saved.get()
},
getCurrent(store) {
let id = store.currentID(cursor)
return store.value(id)
},
getCurrentElement(elements) {
return elements.slice(cursor, cursor + 1);
},
save() {
return createCursor(cursor);
},
moveUp(store) {
cursor = store.prevCursorPosition(cursor)
},
moveDown(store) {
cursor = store.nextCursorPosition(cursor, true)
},
remove(store) {
store.remove(cursor, 1)
},
insertAbove(store, item) {
store.insertBefore(store.currentID(cursor), item)
},
insertBelow(store, item) {
let id = store.insertAfter(store.currentID(cursor), item)
cursor = store.index(id)
},
forwardToNextVisible(store) {
cursor = store.nextCursorPosition(cursor, false)
},
};
}
export default createCursor;