overleaf/services/web/frontend/js/ide/history/directives/historyDroppableArea.js

import App from '../../../base'

export default App.directive('historyDroppableArea', () => ({
  scope: {
    historyDroppableAreaOnDrop: '&',
    historyDroppableAreaOnOver: '&',
    historyDroppableAreaOnOut: '&',
  },
  restrict: 'A',
  link(scope, element, attrs) {
    element.droppable({
      accept: e => '.history-entry-toV-handle, .history-entry-fromV-handle',
      drop: (e, ui) => {
        const draggedBoundary = ui.draggable.data('selectionBoundary').boundary
        ui.helper.data('wasProperlyDropped', true)
        scope.historyDroppableAreaOnDrop({ boundary: draggedBoundary })
      },
      over: (e, ui) => {
        const draggedBoundary = ui.draggable.data('selectionBoundary').boundary
        scope.historyDroppableAreaOnOver({ boundary: draggedBoundary })
      },
    })
  },
}))