<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">% \documentstyle[11pt,twoside,manpage]{report}
% \begin{document}
% \date{November 25, 1990}
%
% \begin{titlepage}
%     \vspace*{1.0in}
%     \begin{flushright}
%           {\huge\bf OIM C++ Library} \\[.25cm]
%           {\rule[.1in]{4.5in}{.02in}}\\[.25cm]
%           {\large\bf Reference Manual} \\[2.0cm]
%           {\large\bf Version 1.0} \\[4.0cm]
%           {\bf Rong Chen}\\[1.0cm]
%           {Research Services}\\
%           {Office for Information Management}\\
%           {1407 W. Gregory Drive}\\
%           {Urbana, IL 61801}\\
%           {(217)--244--8538}\\
%     \end{flushright}
% \end{titlepage}
%
% \pagenumbering{roman}
% \tableofcontents
%
% \chapter*{Preface}
%
% Object-oriented problem solving and object-oriented programming
% represent a way of thinking and a methodology for computer
% programming that are quite different from the traditional approaches
% supported by structured programming languages. The powerful
% features of object-oriented programming support the concepts that
% make computer problem solving a more human-like activity and
% that increase the re-usability of software code. As object-oriented
% languages become steadily available, object-oriented programming
% is becoming more and more popular among both system developers
% and application programmers.
%
% \newpage
%
% \raggedbottom
% \pagenumbering{arabic}
% \pagestyle{headings}
% \chapter*{Class Descriptions}
%
% \begin{manpage}{OIM C++ Library}{Choice}{Version 1.0}
%
% \subtitle{Name}
%     Choice --- a set of boxes representing the choices available.
%
% \subtitle{Declaration}
%     \#include \&lt;choice.h\&gt;
%
% \function{Choice(Point origin, Point corner,
%                  int foreground_color, int background_color,
%                  int frame_style, int space_in_between,
%                  int number_of_choices,
%                  const~char\* first_label, $...$ )}
%     Constructs a choice object.  Each choice object is a set of boxes
%     representing the choices available.  The "origin" and "corner"
%     define the rectangular area inside which the boxes are displayed.
%     The "space_in_between" (in pixels)
%     defines the distance between two adjacent boxes.  Depending on
%     whether there is enough room to put all the choices horizontally
%     or vertically in the designated area,
%     the choices will be laid out accordingly.  The
%     attributes "foreground_color", "background_color" and "frame_style"
%     define the colors for each box that represents each choice.
%     The number of labels starting with "first_label" must match the
%     number given by "number_of_choices".  Each label is displayed within
%     its corresponding box.  The choices are displayed
%     as soon as they are created.
%
% \function{Choice(int number_of_choices, Boolean is_horizontal = VERTICAL)}
%     Constructs an array of choices or
%     a choice object with boxes of different sizes.  The attributes
%     of the actual choices will be defined later using the
%     addItem() operation. Note: It is forbidden to have arguments
%     in the constructors of array objects in C++.
%
% \function{\~Choice()}
%     Choice class has an empty destructor.
%
% \subtitle{Description}
%     A Choice object is a set of related boxes. It is used to display
%     multiple choices on the screen.
%     A choice may either be selected by pressing a hot key
%     (when mouse is not enabled) or by pressing a mouse button when the mouse
%     cursor is within the intended choice box.
%     The first highlighted character in the text label will be the
%     hot key if the mouse is not enabled, otherwise, the highlighted
%     character will have no effect. For example, label "@N@ext" designates
%     "N" as the hot key for the button if the mouse is not enabled.
%     By default, if the mouse driver is loaded before program execution,
%     the mouse is enabled.  When using the mouse to select
%     a choice, the selection is immediate; a hot key must be confirmed
%     by pressing ENTER (carriage return key).  Arrow keys can also be used
%     to move the current selection in the direction indicated by the arrows,
%     this also requires an ENTER to confirm.
%
% \subtitle{Global \\ Variables}
% \variable{char host_name[20] = \"rose.cs.uiuc.edu\"}
%     The "host_name" buffer is initialized to the current machine name
%     before the main() function is executed.  The machine name is
%     usually declared in a DOS shell variable "OIMUSER".
%
% \variable{Boolean mouse_installed}
%     By default, the "mouse_installed" variable is assigned to TRUE if
%     the mouse driver has been installed before program execution;
%     otherwise it is assigned to FALSE.  The value may also be changed
%     through enableMouse() and disableMouse() functions.
%
% \subtitle{Macros}
% \function{MAX({\it x}, {\it y})}
%     Returns the maximum of the two comparable objects "x", and "y".
%     This macro is often used to compare integers or real numbers.
%
% \function{MIN({\it x}, {\it y})}
%     Returns the minimum of the two comparable objects "x", and "y".
%     This macro is often used to compare integers or real numbers.
%
% \subtitle{Public \\ Operations}
% \function{void addItem(Point origin, Point corner,
%                  int foreground_color, int background_color,
%                  int frame_style, const~char\* label,
%                  int text_color = WHITE,
%                  int text_highlight_color = LIGHT_WHITE)}
%     Defines the attributes of a choice box in the array declared by the
%     Choice(int "number_of_choices", Boolean "is_horizontal" = VERTICAL)
%     constructor. It must be called exactly "number_of_choices"
%     times.  The first call specifies the first choice, second call specifies
%     the second choice, and so on.  The attributes "origin" and "corner"
%     define a box area where the choice item is located on the screen.  Other
%     attributes are self-explanatory.  This call is particularly useful
%     on program setup pages.
%
% \function{Boolean hasValue()}
%     Returns TRUE if the designated choice object has been selected at
%     least once.  Graphically,
%     it means one of the choices is rendered in reverse colors.  It is
%     sometimes necessary to check if all choice objects on a screen have
%     been selected, so that a program can go on to the next page of screen.
%     If a previous select() call is returned abnormally by pressing an ESC
%     key, this function will return FALSE. Should this occur, the previous
%     value, if any, will also be lost.
%
% \subtitle{Virtual \\ Operations}
%
% \function{void action(int status)}
%     Defines the behaviors of the choice object when a choice handler
%     has been bonded to the object.  This function is called by the
%     event handler when it detects that the choice object has been
%     selected.  The default action is to do nothing if no choice handler
%     presents, otherwise, it invokes the choice handler
%     and passes it along with the current status
%     (whatever has been returned from a status() call).
%     Do not modify this function unless it is absolutely necessary because
%     it redefines the semantics of all choice objects.
%
% \function{void bind(void \hbox{\rm (\*{\it handler})(int)})}
%     Associates a choice handler function with the choice object.  Every
%     time this choice object is invoked, the choice handler is called
%     immediately.
%     The handler is passed along with the current "status"
%     (return value of status() call) as its argument. The default
%     action taken by the event handler can be modified by changing
%     the next function action().
%
% \function{Boolean isSelected(Point cursor)}
%     Returns TRUE if a legal hot key is pressed for the
%     the indicated choice object. It also returns TRUE if
%     a mouse button is pressed within the range of the choice object area.
%     This call is used by the event handler to check if this choice object
%     has been selected.  It is hardly needed in regular applications.
%     The "cursor" is for mouse cursor in mouse mode or faked with the
%     current keyboard input as the cursor's x coordinate.
%
% \subtitle{See Also}
%      Event, Button, Box
%
% \subtitle{Author}
%     Rong Chen at the Office for Information Management, UIUC. 9-1-89.
%
% \end{manpage}
% \newpage
% \begin{verbatim}
%     #include &lt;stdlib.h&gt;
%     #include "choice.h"
%
%     void handler1(int pick) {
%         Box box(500, 30, 600, 60, LIGHT_CYAN, LIGHT_MAGENTA);
%         box &lt;&lt; pick + 1;
%     }
%
%     void handler2(int pick) {
%         Box box(500, 30, 600, 60, LIGHT_CYAN, LIGHT_MAGENTA);
%         box &lt;&lt; (pick==0 ? "Ape" : (pick==1 ? "Bob" : "Car"));
%     }
%
%     void handler3(int pick) {
%         Box box(500, 30, 600, 60, LIGHT_CYAN, LIGHT_MAGENTA);
%         switch (pick) {
%             case 0: box &lt;&lt; "D"; break; case 1: box &lt;&lt; "E"; break;
%             case 2: box &lt;&lt; "F"; break; case 3: box &lt;&lt; "G"; break;
%             case 4: exit(0);
%         }
%     }
%
%     main() {
%         Point a(100, 100), b(220, 130);
%         Choice c1(a, b, BROWN, RED, ON_BORDER, 0, 4,
%                        "@1@", "@2@", "@3@", "@4@");
%         Choice c2(3, HORIZONTAL);
%         c2.addItem(Point(200, 200), Point(260,230),
%                    WHITE, BLUE, IN_BORDER, "@A@pe");
%         c2.addItem(Point(270, 200), Point(330,230),
%                    WHITE, BLUE, IN_BORDER, "@B@ob");
%         c2.addItem(Point(340, 200), Point(400,230),
%                    WHITE, BLUE, IN_BORDER, "@C@ar");
%         a = Point(500, 230); b = Point(550, 330);
%         Choice c3(a, b, GREEN, GRAY, NO_BORDER, 10, 5,
%                        "@D@", "@E@", "@F@", "@G@", "@H@");
%         c1.bind(handler1);
%         c2.bind(handler2);
%         c3.bind(handler3);
%
%         waitForEvents();
%     }
% \end{verbatim}
%
% \end{document}
%===========================[End of sample.tex]=============================
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