type LabelStudio = any;
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export class LSFHistory {
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history: Array<{ taskID: number; annotationID: number }> = [];
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lsf: LabelStudio = null;
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current = -1;
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callback?: () => void;
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constructor(lsf: LabelStudio) {
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this.lsf = lsf;
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}
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add(taskID: number, annotationID: number) {
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this.history.push({ taskID, annotationID });
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this.current = this.length;
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if (this.callback) this.callback();
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}
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onChange(callback: () => void) {
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this.callback = callback;
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}
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get isFirst() {
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return this.current === 0;
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}
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get isLast() {
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return this.current === this.history.length;
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}
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get canGoBack() {
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return this.length > 0 && !this.isFirst;
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}
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get canGoForward() {
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return this.length > 0 && !this.isLast;
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}
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get length() {
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return this.history.length;
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}
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async goBackward() {
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this.current -= 1;
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await this.load();
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}
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async goForward() {
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this.current += 1;
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await this.load();
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}
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private async load() {
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const index = this.current;
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if (index >= 0 && index < this.length) {
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const { taskID, annotationID } = this.history[index];
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await this.lsf.loadTask(taskID, annotationID);
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this.current = index;
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} else {
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await this.lsf.loadNextTask();
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}
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if (this.callback) this.callback();
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}
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}
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