React 绘制后回调

一、作用

二、安排绘制后回调

备注

• requestPostPaintCallback() 由宿主环境提供

export function schedulePostPaintCallback(callback: (endTime: number) => void) {
  callbacks.push(callback);
  if (!postPaintCallbackScheduled) {
    postPaintCallbackScheduled = true;
    requestPostPaintCallback(endTime => {
      for (let i = 0; i < callbacks.length; i++) {
        callbacks[i](endTime);
      }
      postPaintCallbackScheduled = false;
      callbacks = [];
    });
  }
}

变量

1. 已安排绘制后回调

let postPaintCallbackScheduled = false;

2. 回调

let callbacks: Array<any | ((endTime: number) => void)> = [];