/********************************************************************************
 * Copyright (c) 2025-2026 EclipseSource and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/
import { Disposable, DisposableCollection, Emitter, Event, GModelRoot, ICommand, ICommandStack, LazyInjector, Viewport } from '@eclipse-glsp/sprotty';
/**
 * Service that tracks changes to the model root and the viewport.
 * Allows to register listeners that are notified when the model root or the viewport changes.
 * The current model root can be queried at any time.
 */
export interface IModelChangeService {
    /** The current model root */
    readonly currentRoot: Readonly<GModelRoot> | undefined;
    /**
     * Event that is fired when the model root of the diagram changes i.e. after the `CommandStack` has processed a model update.
     */
    onModelRootChanged: Event<Readonly<GModelRoot>>;
    /**
     * Event that is fired when the viewport of the diagram changes i.e. after the `CommandStack` has processed a viewport update.
     * By default, this event is only fired if the viewport was changed via a `SetViewportCommand` or `BoundsAwareViewportCommand`
     */
    onViewportChanged: Event<ViewportChange>;
}
/**
 * Event data for the {@link IModelChangeService.onViewportChanged} event.
 */
export interface ViewportChange {
    /** The new viewport */
    newViewport: Readonly<Viewport>;
    /** The old viewport */
    oldViewport?: Readonly<Viewport>;
}
export declare class ModelChangeService implements IModelChangeService, Disposable {
    protected lazyInjector: LazyInjector;
    protected _currentRoot?: Readonly<GModelRoot>;
    protected lastViewport?: Readonly<Viewport>;
    protected toDispose: DisposableCollection;
    get currentRoot(): Readonly<GModelRoot> | undefined;
    protected get commandStack(): ICommandStack;
    protected onModelRootChangedEmitter: Emitter<Readonly<GModelRoot>>;
    get onModelRootChanged(): Event<Readonly<GModelRoot>>;
    protected onViewportChangedEmitter: Emitter<ViewportChange>;
    get onViewportChanged(): Event<ViewportChange>;
    protected initialize(): void;
    dispose(): void;
    protected handleCommandExecution(command: ICommand, newRoot: GModelRoot): void;
    protected isModelRootChangeCommand(command: ICommand): boolean;
    protected isViewportChangeCommand(command: ICommand): boolean;
    protected handleModelRootChangeCommand(command: ICommand, newRoot: GModelRoot): void;
    protected handleViewportChangeCommand(command: ICommand, newRoot: GModelRoot): void;
    protected hasViewportChanged(newViewport: Readonly<Viewport>): boolean;
    protected toViewport(root: Readonly<GModelRoot>): Readonly<Viewport> | undefined;
}
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