@aurigma/design-atoms/Input/InputHandler/Create/CreateInputHandlerStateMachine.js

Design Atoms is a part of Customer's Canvas SDK which allows for manipulating individual design elements through your code.

import { Exception } from "@aurigma/design-atoms-model/Exception";
import { EventObject } from "@aurigma/design-atoms-model/EventObject";
import { InputState } from "./../../../Input/InputManager/IInputManager";
export class CreateInputHandlerStateMachine {
    constructor() {
        this._stateChanged = new EventObject();
        this._currentState = CreateInputHandlerState.Initial;
        this._allowedTransitions = new Map([
            [CreateInputHandlerState.Initial, [CreateInputHandlerState.PointSelected, CreateInputHandlerState.RectangleSelectionStarted]],
            [CreateInputHandlerState.RectangleSelectionStarted, [CreateInputHandlerState.RectangleSelected, CreateInputHandlerState.RectangleSelectionChanged]],
            [CreateInputHandlerState.RectangleSelectionChanged, [CreateInputHandlerState.RectangleSelected, CreateInputHandlerState.RectangleSelectionChanged]],
            [CreateInputHandlerState.RectangleSelected, [CreateInputHandlerState.Initial]],
            [CreateInputHandlerState.PointSelected, [CreateInputHandlerState.Initial]],
        ]);
    }
    onMove(params) {
        switch (params.state) {
            case InputState.Started:
                this._changeState(CreateInputHandlerState.RectangleSelectionStarted, params.startWorkspace);
                this._changeState(CreateInputHandlerState.RectangleSelectionChanged, params.workspace);
                // TODO: It's strange decision, but there is no time to change logic. Need to refactor to new Input System
                break;
            case InputState.InProgress:
                this._changeState(CreateInputHandlerState.RectangleSelectionChanged, params.workspace);
                break;
            case InputState.Finished:
                this._changeState(CreateInputHandlerState.RectangleSelected, params.workspace);
                this._changeState(CreateInputHandlerState.Initial, params.workspace);
                break;
        }
    }
    onLongTap(params) {
        this._changeState(CreateInputHandlerState.PointSelected, params.workspace);
        this._changeState(CreateInputHandlerState.Initial, params.workspace);
    }
    onClick(params) {
        this._changeState(CreateInputHandlerState.PointSelected, params.workspace);
        this._changeState(CreateInputHandlerState.Initial, params.workspace);
    }
    addStateChanged(handler) { this._stateChanged.add(handler); }
    removeStateChanged(handler) { this._stateChanged.remove(handler); }
    _changeState(state, point) {
        if (!this._allowedTransitions.get(this._currentState).includes(state))
            throw new Exception(`${this._currentState} to ${state} transition is restricted`);
        this._currentState = state;
        this._stateChanged.notify({
            state: state,
            point: point
        });
    }
}
export var CreateInputHandlerState;
(function (CreateInputHandlerState) {
    CreateInputHandlerState["Initial"] = "Initial";
    CreateInputHandlerState["PointSelected"] = "PointSelected";
    CreateInputHandlerState["RectangleSelectionStarted"] = "RectangleSelectionStarted";
    CreateInputHandlerState["RectangleSelectionChanged"] = "RectangleSelectionChanged";
    CreateInputHandlerState["RectangleSelected"] = "RectangleSelected";
})(CreateInputHandlerState || (CreateInputHandlerState = {}));
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