Refactor layout .show/.isShown to handle branch nodes

src/core/plugins/layout/actions.js

@@ -37,17 +37,3 @@ export function changeMode(thing, mode="") {
     payload: {thing, mode}
   }
 }
-
-
-// export function onlyShow(thing, shown=true) {
-//   thing = normalizeArray(thing)
-//   if(thing.length < 2)
-//     throw new Error("layoutActions.onlyShow only works, when `thing` is an array with length > 1")
-//   return {
-//     type: ONLY_SHOW,
-//     payload: {thing, shown}
-//   }
-// }
-
-
-

src/core/plugins/layout/reducers.js

@@ -1,3 +1,4 @@
+import { fromJS } from "immutable"
 import {
   UPDATE_LAYOUT,
   UPDATE_FILTER,
@@ -12,9 +13,14 @@ export default {
   [UPDATE_FILTER]: (state, action) => state.set("filter", action.payload),
 
   [SHOW]: (state, action) => {
-    let thing = action.payload.thing
-    let shown = action.payload.shown
-    return state.setIn(["shown"].concat(thing), shown)
+    const isShown = action.payload.shown
+    // This is one way to serialize an array, another (preferred) is to convert to json-pointer
+    // TODO: use json-pointer serilization instead of fromJS(...), for performance
+    const thingToShow = fromJS(action.payload.thing)
+    // This is a map of paths to bools
+    // eg: [one, two] => true
+    // eg: [one] => false
+    return state.update("shown", fromJS({}), a => a.set(thingToShow, isShown))
   },
 
   [UPDATE_MODE]: (state, action) => {
@@ -24,4 +30,3 @@ export default {
   }
 
 }
-

src/core/plugins/layout/selectors.js

@@ -1,5 +1,6 @@
 import { createSelector } from "reselect"
 import { normalizeArray } from "core/utils"
+import { fromJS } from "immutable"
 
 const state = state => state
 
@@ -9,7 +10,7 @@ export const currentFilter = state => state.get("filter")
 
 export const isShown = (state, thing, def) => {
   thing = normalizeArray(thing)
-  return Boolean(state.getIn(["shown", ...thing], def))
+  return state.get("shown", fromJS({})).get(fromJS(thing), def)
 }
 
 export const whatMode = (state, thing, def="") => {
@@ -21,4 +22,3 @@ export const showSummary = createSelector(
   state,
   state => !isShown(state, "editor")
 )
-