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source-tree.js
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58 lines (46 loc) · 1.23 KB
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
// @flow
/**
* Source tree reducer
* @module reducers/source-tree
*/
import type { SourceTreeAction, FocusItem } from "../actions/types";
export type SourceTreeState = {
expanded: Set<string>,
focusedItem: ?FocusItem
};
export function InitialState(): SourceTreeState {
return {
expanded: new Set(),
focusedItem: null
};
}
export default function update(
state: SourceTreeState = InitialState(),
action: SourceTreeAction
): SourceTreeState {
switch (action.type) {
case "SET_EXPANDED_STATE":
return updateExpanded(state, action);
case "SET_FOCUSED_SOURCE_ITEM":
return { ...state, focusedItem: action.item };
}
return state;
}
function updateExpanded(state, action) {
return {
...state,
expanded: new Set(action.expanded)
};
}
type OuterState = {
sourceTree: SourceTreeState
};
export function getExpandedState(state: OuterState) {
return state.sourceTree.expanded;
}
export function getFocusedSourceItem(state: OuterState): ?FocusItem {
return state.sourceTree.focusedItem;
}