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For example, Link is a compound of a text box and a button. Vaadin doesn't provide this combination out of the box, so we need a

Javadoc resource link
className info.magnolia.ui.form.field.LinkField renderType asynchronous

class that extends Vaadin CustomField. The custom field class provides a layout with a text field on the left and a button on the right. It also registers a preview component that displays a thumbnail of the link target if defined.

The Link field link field is an example that provides all three classes:

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