Dermot Duffy
8d3cf07b43
- Much improved API cleanliness and testability to allow further extensibility in future - Simplified code in `live` view This technically contains a small change in how overrides work in the `live` view. Since that change is _closer_ to the documentation, and since this is likely to be rarely used, this is not considered a breaking change. Previously, overrides for a given live camera would always render _as if_ that camera was selected, vs was actually selected. Now, overrides will only apply in the live view when the camera is _actually_ selected. If this is an issue for you in practice, lets discuss.
61 lines
1.6 KiB
TypeScript
61 lines
1.6 KiB
TypeScript
import { isEqual } from 'lodash-es';
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import {
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ConditionState,
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ConditionStateChange,
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ConditionStateListener,
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ConditionStateManagerReadonlyInterface,
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} from './types';
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/**
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* A class to manage state used in the evaluation of conditions.
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*/
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export class ConditionStateManager implements ConditionStateManagerReadonlyInterface {
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protected _listeners: ConditionStateListener[] = [];
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protected _state: ConditionState = {};
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public addListener(listener: ConditionStateListener): void {
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this._listeners.push(listener);
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}
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public removeListener(listener: ConditionStateListener): void {
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this._listeners = this._listeners.filter((l) => l !== listener);
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}
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public getState(): ConditionState {
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return this._state;
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}
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public setState(state: ConditionState): void {
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this._processStateChange(this._calculateTrueChange(state));
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}
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protected _processStateChange(changeState: ConditionState): void {
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if (!Object.keys(changeState).length) {
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return;
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}
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const oldState = this._state;
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this._state = {
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...oldState,
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...changeState,
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};
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this._callListeners({ old: oldState, change: changeState, new: this._state });
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}
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protected _calculateTrueChange(change: ConditionState): ConditionState {
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const changeState: ConditionState = {};
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for (const key of Object.keys(change)) {
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if (!isEqual(change[key], this._state[key])) {
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changeState[key] = change[key];
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}
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}
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return changeState;
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}
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protected _callListeners = (stateChange: ConditionStateChange): void => {
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this._listeners.forEach((listener) => listener(stateChange));
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};
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}
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