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import { observable, action, runInAction } from "mobx";
import 'source-map-support/register';
import { Without } from "../../Utils";
import { string } from "prop-types";
function getBatchName(target: any, key: string | symbol): string {
let keyName = key.toString();
if (target && target.constructor && target.constructor.name) {
return `${target.constructor.name}.${keyName}`;
}
return keyName;
}
function propertyDecorator(target: any, key: string | symbol) {
Object.defineProperty(target, key, {
configurable: true,
enumerable: false,
get: function () {
return 5;
},
set: function (value: any) {
Object.defineProperty(this, key, {
enumerable: false,
writable: true,
configurable: true,
value: function (...args: any[]) {
let batch = UndoManager.StartBatch(getBatchName(target, key));
try {
return value.apply(this, args);
} finally {
batch.end();
}
}
});
}
});
}
export function undoBatch(target: any, key: string | symbol, descriptor?: TypedPropertyDescriptor<any>): any;
export function undoBatch(fn: (...args: any[]) => any): (...args: any[]) => any;
export function undoBatch(target: any, key?: string | symbol, descriptor?: TypedPropertyDescriptor<any>): any {
if (!key) {
return function () {
let batch = UndoManager.StartBatch("");
try {
return target.apply(undefined, arguments);
} finally {
batch.end();
}
};
}
if (!descriptor) {
propertyDecorator(target, key);
return;
}
const oldFunction = descriptor.value;
descriptor.value = function (...args: any[]) {
let batch = UndoManager.StartBatch(getBatchName(target, key));
try {
return oldFunction.apply(this, args);
} finally {
batch.end();
}
};
return descriptor;
}
export namespace UndoManager {
export interface UndoEvent {
undo: () => void;
redo: () => void;
}
type UndoBatch = UndoEvent[];
let undoStack: UndoBatch[] = observable([]);
let redoStack: UndoBatch[] = observable([]);
let currentBatch: UndoBatch | undefined;
let batchCounter = 0;
let undoing = false;
export function AddEvent(event: UndoEvent): void {
if (currentBatch && batchCounter && !undoing) {
currentBatch.push(event);
}
}
export function CanUndo(): boolean {
return undoStack.length > 0;
}
export function CanRedo(): boolean {
return redoStack.length > 0;
}
let openBatches: Batch[] = [];
export function GetOpenBatches(): Without<Batch, 'end'>[] {
return openBatches;
}
export function TraceOpenBatches() {
console.log(`Open batches:\n\t${openBatches.map(batch => batch.batchName).join("\n\t")}\n`);
}
export class Batch {
private disposed: boolean = false;
constructor(readonly batchName: string) {
openBatches.push(this);
}
private dispose = (cancel: boolean) => {
if (this.disposed) {
throw new Error("Cannot dispose an already disposed batch");
}
this.disposed = true;
openBatches.splice(openBatches.indexOf(this));
EndBatch(cancel);
}
end = () => { this.dispose(false); };
cancel = () => { this.dispose(true); };
}
export function StartBatch(batchName: string): Batch {
batchCounter++;
if (batchCounter > 0) {
currentBatch = [];
}
return new Batch(batchName);
}
const EndBatch = action((cancel: boolean = false) => {
batchCounter--;
if (batchCounter === 0 && currentBatch && currentBatch.length) {
if (!cancel) {
undoStack.push(currentBatch);
}
redoStack.length = 0;
currentBatch = undefined;
}
});
//TODO Make this return the return value
export function RunInBatch<T>(fn: () => T, batchName: string) {
let batch = StartBatch(batchName);
try {
return runInAction(fn);
} finally {
batch.end();
}
}
export const Undo = action(() => {
if (undoStack.length === 0) {
return;
}
let commands = undoStack.pop();
if (!commands) {
return;
}
undoing = true;
for (let i = commands.length - 1; i >= 0; i--) {
commands[i].undo();
}
undoing = false;
redoStack.push(commands);
});
export const Redo = action(() => {
if (redoStack.length === 0) {
return;
}
let commands = redoStack.pop();
if (!commands) {
return;
}
undoing = true;
for (const command of commands) {
command.redo();
}
undoing = false;
undoStack.push(commands);
});
}
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