gab-social/app/javascript/gabsocial/actions/timeline_injections.js

import {
  TIMELINE_INJECTION_WEIGHT_DEFAULT,
  TIMELINE_INJECTION_WEIGHT_MULTIPLIER,
  TIMELINE_INJECTION_WEIGHT_SUBTRACTOR,
  TIMELINE_INJECTION_WEIGHT_MIN,
} from '../constants'
import { changeSetting } from './settings'

export const TIMELINE_INJECTION_SHOW = 'TIMELINE_INJECTION_SHOW'
export const TIMELINE_INJECTION_HIDE = 'TIMELINE_INJECTION_HIDE'

export const showTimelineInjection = (injectionId) => (dispatch) => {
  dispatch({
    type: TIMELINE_INJECTION_SHOW,
    injectionId,
  })
}

export const hideTimelineInjection = (injectionId) => (dispatch, getState) => {
  const existingInjectionWeight = getState().getIn(['settings', 'injections', injectionId], null)

  if (!existingInjectionWeight) return

  const newInjectionWeight = Math.max(existingInjectionWeight - 0.005, 0.01)

  dispatch(changeSetting(['injections', injectionId], newInjectionWeight))

  dispatch({
    type: TIMELINE_INJECTION_HIDE,
    injectionId,
  })
}