queue

queue.ts

@vegar ringdal <vegar.ringdal@gmail.com>

export class Queue {

    private tasks: any[] = [];

    public add(microtask: boolean): Promise<Function> {
        return new Promise((resolve) => {
            if (microtask) {
                this.tasks.splice(1, 0, resolve);
            } else {
                this.tasks.push(resolve);
            }
            if (this.tasks.length === 1) {
                let task = this.tasks[0];
                let finishedCallback: Function;
                finishedCallback = () => {
                    requestAnimationFrame(() => {
                        let old = this.tasks.shift();
                        old = null;
                        let nextTask = this.tasks[0];
                        if (nextTask) {
                            nextTask(finishedCallback);
                        }
                    });
                };
                requestAnimationFrame(() => {
                    task(finishedCallback);
                });
            }
        });
    }

}