widget

Before the "widget" fragment is rendered, the "uri" argument will be set to the return value of the "uri" method on the viewport. The layout will render a hyperlink with the "uri" as value of the "href" attribute and the "display_fragment" fragment as content of the element.

display_fragment

This will render nothing if the viewport doesn't return true when "has_display" is called on it. If it has a "display" defined and it is a viewport, the "_" argument will be set to it and the "viewport" fragment (inherited from Reaction::UI::Widget will be rendered. If the "display" is not a viewport, the "string_value" argument will be set and the "display_string" layout will be rendered.

"display_fragment" is only implemented in the widget class.

display_string

Only implemented in the layout set. This will simply output the value of the "string_value" argument as content of the hyperlink element.