/*
 * Class what_if_ui_t is the companion view for what_if_t, q.v.
 */

class what_if_ui_t {
  public:
    what_if_ui_t(what_if_t* model);
    /*
     * Construct with the given companion modoel.
     */
    Interactor* compose(string_list* header_labels);
    /*
     * Compose the UI components, which consists of three hboxes: one holding
     * the given header labels, the holding string editors for the user to
     * input what if data values, and the the botonmost containg push buttons
     * for Recompoute, Restore. and Done.  These hboxes are slapped into a vbox
     * and the whole wad is returned.
     */

    void 


  protected:
    what_if_t* model;
    int numcolumns;		/* Number of columsn in the display */

    /**
     * Utility UI composition functions.
     */
    HBox* compose_header(header_labels));
    HBox* compose_editors(columns));
    HBox* compose_buttons());

};