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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,56 +1,54 @@ | ||
| import { LayoutManager } from './LayoutManager'; | ||
| import type { RegistrationContext, StrictLayoutContext } from './types'; | ||
| import type { FabricObject } from '../shapes/Object/FabricObject'; | ||
| import type { Group } from '../shapes/Group'; | ||
|
|
||
| /** | ||
| * Today the LayoutManager class also takes care of subscribing event handlers | ||
| * to update the group layout when the group is interactive and a transform is applied | ||
| * to a child object. | ||
| * The ActiveSelection is never interactive, but it could contain obejcts from | ||
| * The ActiveSelection is never interactive, but it could contain objects from | ||
| * groups that are. | ||
| * The standard LayoutManager would subscribe the children of the activeSelection to | ||
| * perform layout changes to the activeselection itself, what we need instead is that | ||
| * perform layout changes to the active selection itself, what we need instead is that | ||
| * the transformation applied to the active selection will trigger changes to the | ||
| * original group of the children ( the one referenced under the parent property ) | ||
| * This subclass of the LayoutManager has a single duty to fill the gap of this difference. | ||
| * This subclass of the LayoutManager has a single duty to fill the gap of this difference.` | ||
| */ | ||
| export class ActiveSelectionLayoutManager extends LayoutManager { | ||
| /** | ||
| * Subscribe an object to transform events that will trigger a layout change on the parent | ||
| * This is important only for interactive groups. | ||
| * @param object | ||
| * @param context | ||
| */ | ||
| protected subscribe( | ||
| object: FabricObject, | ||
| subscribeTargets( | ||
| context: RegistrationContext & Partial<StrictLayoutContext> | ||
| ) { | ||
| const { parent, group: activeSelection } = object; | ||
| if (!parent || !activeSelection || activeSelection === parent) { | ||
| // nothing to do here | ||
| return; | ||
| } | ||
| this.unsubscribe(object, context); | ||
| const disposers = this.attachHandlers(activeSelection, { | ||
| target: parent, | ||
| targets: context.targets, | ||
| ): void { | ||
| const activeSelection = context.target; | ||
| const parents = context.targets.reduce((parents, target) => { | ||
| target.parent && parents.add(target.parent); | ||
| return parents; | ||
| }, new Set<Group>()); | ||
| parents.forEach((parent) => { | ||
| parent.layoutManager.subscribeTargets({ | ||
| target: parent, | ||
| targets: [activeSelection], | ||
| }); | ||
| }); | ||
| // the _subscriptions Map is using the parent as a key. | ||
| // This will ensure that a single set of events is kept for each unique parent | ||
| this._subscriptions.set(parent, disposers); | ||
| } | ||
|
|
||
| /** | ||
| * unsubscribe object layout triggers | ||
| * unsubscribe from parent only if all its children were deselected | ||
| */ | ||
| protected unsubscribe( | ||
| object: FabricObject, | ||
| context?: RegistrationContext & Partial<StrictLayoutContext> | ||
| ) { | ||
| const { parent } = object; | ||
| if (parent) { | ||
| (this._subscriptions.get(parent) || []).forEach((d) => d()); | ||
| this._subscriptions.delete(parent); | ||
| } | ||
| unsubscribeTargets( | ||
| context: RegistrationContext & Partial<StrictLayoutContext> | ||
| ): void { | ||
| const activeSelection = context.target; | ||
| const selectedObjects = activeSelection.getObjects(); | ||
| const parents = context.targets.reduce((parents, target) => { | ||
| target.parent && parents.add(target.parent); | ||
| return parents; | ||
| }, new Set<Group>()); | ||
| parents.forEach((parent) => { | ||
| !selectedObjects.some((object) => object.parent === parent) && | ||
| parent.layoutManager.unsubscribeTargets({ | ||
| target: parent, | ||
| targets: [activeSelection], | ||
| }); | ||
| }); | ||
| } | ||
| } |