/
diagram-services.ts
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/
diagram-services.ts
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/********************************************************************************
* Copyright (c) 2021 TypeFox 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 { ServerActionHandlerRegistry } from './action-handler';
import { SModelRoot } from './model';
import { JsonMap } from './utils/json';
import { SModelIndex } from './utils/model-utils';
export type DiagramOptions = JsonMap;
/**
* The current state captured by a `DiagramServer`.
*/
export interface DiagramState {
options?: DiagramOptions
currentRoot: SModelRoot
revision: number
index?: SModelIndex
}
/**
* The set of services required by a `DiagramServer`.
*/
export interface DiagramServices {
readonly DiagramGenerator: IDiagramGenerator
readonly ModelLayoutEngine?: IModelLayoutEngine
readonly ServerActionHandlerRegistry?: ServerActionHandlerRegistry
}
/**
* A diagram generator is responsible for creating a diagram model from some source.
* This process is controlled by the `DiagramOptions`, which for example may contain
* a URI to the source document from which the diagram shall be created.
*/
export interface IDiagramGenerator {
generate(args: GeneratorArguments): SModelRoot | Promise<SModelRoot>
}
export interface GeneratorArguments {
options: DiagramOptions
state: DiagramState
}
/**
* This service is responsible for the "macro layout" of a model, that is the positioning
* and sizing of the main structural elements of a model. In a graph, macro layout affects
* positions of nodes and routings of edges, but not necessarily the layout of labels and
* compartments inside a node, which are often arranged on the client side ("micro layout").
*/
export interface IModelLayoutEngine {
layout(model: SModelRoot, index?: SModelIndex): SModelRoot | Promise<SModelRoot>;
}