NAME

       "Devel::MAT::UI" - extend the user interface of a "Devel::MAT" explorer

DESCRIPTION

       This virtual package provides methods that Devel::MAT::Tool classes can use to extend the user interface
       provided by a Devel::MAT explorer program.  This package does not exist in a real .pm file; instead, the
       methods should be provided directly by the explorer program. A tool class can rely on being able to call
       them without doing anything special - do not attempt to "use Devel::MAT::UI".

METHODS

   register_icon
         Devel::MAT::UI->register_icon( name => $name, ... )

       A tool may call this to register a named icon image with the UI, for later use in an SV list column or SV
       detail. The name of the icon is taken from the "name" key, and the specific UI implementation will use
       one of the other keys to provide the value for its type.

       This icon is used by SV list columns or SV details where the "type" is "icon". The value set gives the
       name the icon was registered with.

       svg => PATH (GTK)
           Gives a path name to an SVG file containing image data. This path is relative to the share directory
           of the package, managed by File::ShareDir.

   provides_radiobutton_set
         Devel::MAT::UI->provides_radiobutton_set( @buttons )

       A tool may call this to declare that it wishes to have a set of radiobuttons as a choice of options to be
       displayed in the toolbar of the user interface.  Each button is specified in a HASH reference in the
       @buttons list containing the following keys:

       text => STRING
           The text to display on the button

       icon => STRING
           The name of the previously-registered icon to display with the button

       tooltip => STRING
           Descriptive text to associate with the button to further explain it

       code => CODE
           A code reference to invoke when the button is activated.

       The buttons will be displayed in a group of their own, such that selecting one will deactivate all the
       others in the same set.

   provides_svlist_column
         $column = Devel::MAT::UI->provides_svlist_column( type => ..., title => ... )

       A tool may call this to declare that it wishes to provide a new column to display in the main SV list on
       the user interface. It returns an opaque column value that should be passed to "set_svlist_column_values"
       to provide data for the column.

       type => STRING
           The type of the column. This may be "int", "text" or "icon".

       title => STRING
           The title to display in the column header.

   COLUMN_TYPE
   COLUMN_ADDR
   COLUMN_DESC
   COLUMN_SIZE
   COLUMN_BLESSED
   COLUMN_OUTREFS
   COLUMN_INREFS
       Opaque column values to represent the predefined SV list columns.

   set_svlist_column_values
         Devel::MAT::UI->set_svlist_column_values( column => $column, from => $from )

       A tool may call this to provide the values to display in the SV list column it earlier created by calling
       "provides_svlist_column", or to replace the values in any of the predefined columns.

       column => SCALAR
           The value returned from "provides_svlist_column".

       from => CODE
           A function to generate the value to store for each SV. Is invoked with each SV in the SV list, and
           should return the value to set in the column.

              $value = $from->( $sv )

   provides_sv_detail
         Devel::MAT::UI->provides_sv_detail( type => $type, title => $title, render => $render )

       A tool may call this to declare that it provides a section of detail about an SV.

       type => STRING
           The type of the column. This may be "widget", "text" or "icon".

       title => STRING
           The title to display alongside the detail cell on the main SV display pane.

       render => CODE
           A function to generate the display for a given SV address. It is invoked with an SV to display, and
           should a value whose meaning depends on the type. If it returns undef then the row is not displayed
           for this SV.

            $value = $render->( $sv )

       If the type is "widget", any of the following "make_*" methods can be used by the render function to
       generate a widget to display.

   make_widget_text
         $widget = Devel::MAT::UI->make_widget_text( $text )

       Constructs a widget displaying a fixed text string.

   make_widget_text_icon
         $widget = Devel::MAT::UI->make_widget_text_icon( $text, $icon )

       Constructs a widget displaying a fixed text string next to an icon.

   make_table
         $widget = Devel::MAT::UI->make_table( $label => $widget, $label => $widget, ... )

       Constructs a widget displaying a labeled table of other widgets.

   current_sv
         $sv = Devel::MAT::UI->current_sv

       If the UI has a concept of the "current" SV that the user is viewing, this method returns it. This may be
       used by tools to pick a default SV on which to operate, in case one was not supplied on the commandline.

AUTHOR

       Paul Evans <leonerd@leonerd.org.uk>