There are several functions in the typecho_widget source code that are not very clear. Could you please tell me?

I recently looked at the source code of typecho_widget. This is the parent class of all widgets. There are several methods that are not very clear. Please tell me.

<code>/**</code>

• post event triggered
  *

• @param boolean $condition trigger condition

• @return mixed
  */

1. function on($condition)
   {

   <code>   if ($condition) {
          return $this;
      } else {
          return new Typecho_Widget_Helper_Empty();
      }</code>

   }

It is said that it is triggered by post, so how is it triggered? I don’t see any relevant calls. The general meaning of the function is to return the current widget if the conditions are met. I hope you can enlighten me, thank you! ! !

Reply content:

I recently looked at the source code of typecho_widget. This is the parent class of all widgets. There are several methods that are not very clear. Please tell me.

<code>/**</code>

• post event triggered
  *

• @param boolean $condition trigger condition

• @return mixed
  */

1. function on($condition)
   {

   <code>   if ($condition) {
          return $this;
      } else {
          return new Typecho_Widget_Helper_Empty();
      }</code>

   }

It is said that it is triggered by post, so how is it triggered? I don’t see any relevant calls. The general meaning of the function is to return the current widget if the conditions are met. I hope you can enlighten me, thank you! ! !

Is there anyone who can help me with the answer