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Refactored projection feature so it's derived from the model instead …
…of the view
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| /******************************************************************************** | ||
| * 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 { SChildElement, SParentElement } from '../../base/model/smodel'; | ||
| import { SModelExtension } from '../../base/model/smodel-extension'; | ||
| import { Bounds } from '../../utils/geometry'; | ||
| import { hasOwnProperty } from '../../utils/object'; | ||
| import { BoundsAware, isBoundsAware } from '../bounds/model'; | ||
|
|
||
| /** | ||
| * Model elements implementing this interface can be displayed on a projection bar. | ||
| * _Note:_ Model elements also have to be `BoundsAware` so their projections can be shown. | ||
| */ | ||
| export interface Projectable extends SModelExtension { | ||
| projectionCssClasses: string[] | ||
| } | ||
|
|
||
| export function isProjectable(arg: unknown): arg is Projectable { | ||
| return hasOwnProperty(arg, 'projectionCssClasses'); | ||
| } | ||
|
|
||
| /** | ||
| * A projection can be shown in a horizontal or vertical bar to display an overview of the diagram. | ||
| */ | ||
| export interface ViewProjection { | ||
| projectedBounds: Bounds; | ||
| cssClasses: string[]; | ||
| } | ||
|
|
||
| /** | ||
| * Gather all projections of elements contained in the given parent element. | ||
| */ | ||
| export function getProjections(parent: Readonly<SParentElement>): ViewProjection[] | undefined { | ||
| let result: ViewProjection[] | undefined; | ||
| for (const child of parent.children) { | ||
| if (isProjectable(child) && isBoundsAware(child) && child.projectionCssClasses.length > 0) { | ||
| const projection: ViewProjection = { | ||
| projectedBounds: getProjectedBounds(child), | ||
| cssClasses: child.projectionCssClasses | ||
| }; | ||
| if (result) { | ||
| result.push(projection); | ||
| } else { | ||
| result = [projection]; | ||
| } | ||
| } | ||
| if (child.children.length > 0) { | ||
| const childProj = getProjections(child); | ||
| if (childProj) { | ||
| if (result) { | ||
| result.push(...childProj); | ||
| } else { | ||
| result = childProj; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return result; | ||
| } | ||
|
|
||
| /** | ||
| * Compute the projected bounds of the given model element, that is the absolute position in the diagram. | ||
| */ | ||
| export function getProjectedBounds(model: Readonly<SChildElement & BoundsAware>): Bounds { | ||
| let bounds = model.bounds; | ||
| let parent = model.parent; | ||
| while (parent instanceof SChildElement) { | ||
| bounds = parent.localToParent(bounds); | ||
| parent = parent.parent; | ||
| } | ||
| return bounds; | ||
| } |
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