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This commit is contained in:
Jan Prochazka
2020-12-05 17:23:37 +01:00
parent ac7816fc4b
commit 23d9c9279c
5 changed files with 40 additions and 7 deletions
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12
packages/web/src/utility/useUndoReducer.js
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@@ -1,9 +1,9 @@
import _ from 'lodash';
import React from 'react';
function reducer(state, action) {
switch (action.type) {
case 'set':
// console.log('SET', state.history, action.value);
return {
history: [...state.history.slice(0, state.current + 1), action.value],
current: state.current + 1,
@@ -11,6 +11,16 @@ function reducer(state, action) {
canUndo: true,
canRedo: false,
};
case 'compute': {
const newValue = action.compute(state.history[state.current]);
return {
history: [...state.history.slice(0, state.current + 1), newValue],
current: state.current + 1,
value: newValue,
canUndo: true,
canRedo: false,
};
}
case 'undo':
if (state.current > 0)
return {