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7ccdcc5cef
* refactor(events): Use "export ... from" where applicable
* refactor(events): Introduce EventType enum
Introduce an enum for the event .type values. We can't actually
use it as the type of the .type property on Abstract events,
because we want to allow developers to add their own custom
event types inheriting from this type, but at least this way we
can be reasonably sure that all of our own event subclasses have
distinct .type values—plus consistent use of enum syntax
(EventType.TYPE_NAME) is probably good for readability overall.
Put it in a separate module from the rest of events/utils.ts
because it would be helpful if event utils could use
event instanceof SomeEventType
for type narrowing but but at the moment most events are in
modules that depend on events/utils.ts for their .type
constant, and although circular ESM dependencies should work
in principle there are various restrictions and this
particular circularity causes issues at the moment.
A few of the event classes also depend on utils.ts for fire()
or other functions, which will be harder to deal with, but at
least this commit is win in terms of reducing the complexity
of our dependencies, making most of the Abstract event subclass
module dependent on type.ts, which has no imports, rather than
on utils.ts which has multiple imports.
98 lines
2.6 KiB
TypeScript
98 lines
2.6 KiB
TypeScript
/**
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* @license
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* Copyright 2020 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* Events fired as a result of element select action.
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*
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* @class
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*/
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// Former goog.module ID: Blockly.Events.Selected
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import * as registry from '../registry.js';
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import type {Workspace} from '../workspace.js';
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import {AbstractEventJson} from './events_abstract.js';
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import {UiBase} from './events_ui_base.js';
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import {EventType} from './type.js';
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/**
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* Class for a selected event.
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* Notifies listeners that a new element has been selected.
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*/
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export class Selected extends UiBase {
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/** The id of the last selected selectable element. */
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oldElementId?: string;
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/**
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* The id of the newly selected selectable element,
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* or undefined if unselected.
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*/
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newElementId?: string;
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override type = EventType.SELECTED;
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/**
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* @param opt_oldElementId The ID of the previously selected element. Null if
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* no element last selected. Undefined for a blank event.
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* @param opt_newElementId The ID of the selected element. Null if no element
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* currently selected (deselect). Undefined for a blank event.
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* @param opt_workspaceId The workspace identifier for this event.
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* Null if no element previously selected. Undefined for a blank event.
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*/
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constructor(
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opt_oldElementId?: string | null,
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opt_newElementId?: string | null,
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opt_workspaceId?: string,
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) {
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super(opt_workspaceId);
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this.oldElementId = opt_oldElementId ?? undefined;
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this.newElementId = opt_newElementId ?? undefined;
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}
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/**
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* Encode the event as JSON.
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*
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* @returns JSON representation.
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*/
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override toJson(): SelectedJson {
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const json = super.toJson() as SelectedJson;
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json['oldElementId'] = this.oldElementId;
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json['newElementId'] = this.newElementId;
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return json;
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}
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/**
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* Deserializes the JSON event.
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*
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* @param event The event to append new properties to. Should be a subclass
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* of Selected, but we can't specify that due to the fact that parameters
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* to static methods in subclasses must be supertypes of parameters to
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* static methods in superclasses.
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* @internal
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*/
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static fromJson(
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json: SelectedJson,
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workspace: Workspace,
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event?: any,
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): Selected {
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const newEvent = super.fromJson(
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json,
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workspace,
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event ?? new Selected(),
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) as Selected;
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newEvent.oldElementId = json['oldElementId'];
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newEvent.newElementId = json['newElementId'];
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return newEvent;
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}
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}
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export interface SelectedJson extends AbstractEventJson {
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oldElementId?: string;
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newElementId?: string;
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}
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registry.register(registry.Type.EVENT, EventType.SELECTED, Selected);
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