Customizing an existing annotation tool in our viewer toolbar

It’s possible to customize the following properties of built-in items:

  • title
  • className
  • disabled
  • onPress

In the example below, we add a custom onPress handler to the first item of the ink annotation toolbar:

PSPDFKit.load({
  // ...otherOptions
  annotationToolbarItems: (
    annotation,
    { defaultAnnotationToolbarItems }
  ) => {
    if (annotation instanceof PSPDFKit.Annotations.InkAnnotation) {
      defaultAnnotationToolbarItems[0].onPress = () =>
        alert("Custom onPress handler!");


      return defaultAnnotationToolbarItems;
    }


    return defaultAnnotationToolbarItems;
  }
});

See the API reference to learn more about each individual property.

When you set onPress, it’s added to the parent of the built-in annotation toolbar item.