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import { observable, action, runInAction, ObservableMap } from "mobx";
import { Doc } from "../../fields/Doc";
import { DocumentView } from "../views/nodes/DocumentView";
import { computedFn } from "mobx-utils";
import { List } from "../../fields/List";
export namespace SelectionManager {
class Manager {
@observable IsDragging: boolean = false;
SelectedDocuments: ObservableMap<DocumentView, boolean> = new ObservableMap();
@action
SelectDoc(docView: DocumentView, ctrlPressed: boolean): void {
// if doc is not in SelectedDocuments, add it
if (!manager.SelectedDocuments.get(docView)) {
if (!ctrlPressed) {
this.DeselectAll();
}
manager.SelectedDocuments.set(docView, true);
// console.log(manager.SelectedDocuments);
docView.props.whenActiveChanged(true);
} else if (!ctrlPressed && Array.from(manager.SelectedDocuments.entries()).length > 1) {
Array.from(manager.SelectedDocuments.keys()).map(dv => dv !== docView && dv.props.whenActiveChanged(false));
manager.SelectedDocuments.clear();
manager.SelectedDocuments.set(docView, true);
}
Doc.UserDoc().activeSelection = new List(SelectionManager.SelectedDocuments().map(dv => dv.props.Document));
}
@action
DeselectDoc(docView: DocumentView): void {
if (manager.SelectedDocuments.get(docView)) {
manager.SelectedDocuments.delete(docView);
docView.props.whenActiveChanged(false);
Doc.UserDoc().activeSelection = new List(SelectionManager.SelectedDocuments().map(dv => dv.props.Document));
}
}
@action
DeselectAll(): void {
Array.from(manager.SelectedDocuments.keys()).map(dv => dv.props.whenActiveChanged(false));
manager.SelectedDocuments.clear();
Doc.UserDoc().activeSelection = new List<Doc>([]);
}
}
const manager = new Manager();
export function DeselectDoc(docView: DocumentView): void {
manager.DeselectDoc(docView);
}
export function SelectDoc(docView: DocumentView, ctrlPressed: boolean): void {
manager.SelectDoc(docView, ctrlPressed);
}
export function SetIsDragging(dragging: boolean) { runInAction(() => manager.IsDragging = dragging); }
export function GetIsDragging() { return manager.IsDragging; }
// computed functions, such as used in IsSelected generate errors if they're called outside of a
// reaction context. Specifying the context with 'outsideReaction' allows an efficiency feature
// to avoid unnecessary mobx invalidations when running inside a reaction.
export function IsSelected(doc: DocumentView, outsideReaction?: boolean): boolean {
return outsideReaction ?
manager.SelectedDocuments.get(doc) ? true : false : // get() accesses a hashtable -- setting anything in the hashtable generates a mobx invalidation for every get()
computedFn(function isSelected(doc: DocumentView) { // wraapping get() in a computedFn only generates mobx() invalidations when the return value of the function for the specific get parameters has changed
return manager.SelectedDocuments.get(doc) ? true : false;
})(doc);
}
export function DeselectAll(except?: Doc): void {
let found: DocumentView | undefined = undefined;
if (except) {
for (const view of Array.from(manager.SelectedDocuments.keys())) {
if (view.props.Document === except) found = view;
}
}
manager.DeselectAll();
if (found) manager.SelectDoc(found, false);
}
export function SelectedDocuments(): Array<DocumentView> {
return Array.from(manager.SelectedDocuments.keys());
}
}
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