ngrx-forms/esm2015/src/array/reducer/swap-control.js

Proper integration of forms in Angular 4 applications using ngrx

import { SwapArrayControlAction } from '../../actions';
import { computeArrayState } from '../../state';
import { childReducer, updateIdRecursive } from './util';
function swapArrayValues(a, i, j) {
    const n = [...a];
    [n[i], n[j]] = [n[j], n[i]];
    return n;
}
export function swapControlReducer(state, action) {
    if (action.type !== SwapArrayControlAction.TYPE) {
        return state;
    }
    if (action.controlId !== state.id) {
        return childReducer(state, action);
    }
    const fromIndex = action.fromIndex;
    const toIndex = action.toIndex;
    if (fromIndex === toIndex) {
        return state;
    }
    if (fromIndex < 0 || toIndex < 0) {
        throw new Error(`fromIndex ${fromIndex} or toIndex ${fromIndex} was negative`);
    }
    if (fromIndex >= state.controls.length || toIndex >= state.controls.length) {
        throw new Error(`fromIndex ${fromIndex} or toIndex ${toIndex} is out of bounds with the length of the controls ${state.controls.length}`);
    }
    let controls = swapArrayValues(state.controls, fromIndex, toIndex);
    controls = controls.map((c, i) => (i >= fromIndex || i >= toIndex) ? updateIdRecursive(c, `${state.id}.${i}`) : c);
    return computeArrayState(state.id, controls, state.value, state.errors, state.pendingValidations, state.userDefinedProperties, {
        wasOrShouldBeDirty: true,
        wasOrShouldBeEnabled: state.isEnabled,
        wasOrShouldBeTouched: state.isTouched,
        wasOrShouldBeSubmitted: state.isSubmitted,
    });
}
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