Linux Cubed Series 7: Sunsite/Linux Cubed Series 7 - Sunsite Vol 1.iso/system/admin/linuxcon.000/linuxcon/linuxconf-1.6/dialog/buttons.c

C/C++ Source or Header | 1996-08-01 | 4.6 KB | 194 lines

#include <ctype.h>
#include <limits.h>
#include "diadef.h"
#include "dialog.h"
#include "internal.h"
#include "dialog.m"

/*
    Evaluate the horizontal space needed to draw the buttons
*/
PUBLIC int BUTTONS_INFO::evalwidth()
{
    int ret = 0;
    for (int i=0; i<nb; i++){
        /* add 2 for the < > on each side */
        /* add 2 for some space around the buttons */
        ret += strlen(tb[i]) + 2+2;
    }
    if (!helpfile.is_empty()) ret += 6 + 2 + 2;
    return ret;
}
PUBLIC BUTTONS_INFO::BUTTONS_INFO()
{
    nb = 0;
}

PUBLIC void BUTTONS_INFO::set(
    int _but_options,    // MENUBUT_xxxx | MENUBUT_xxxx | ...
    const char *_helpfile)
{
    nb = 0;
    but_options = _but_options;
    /*
        Not all buttons combination are meaningful. This
        explain why several buttons may share the same
        but_ret value.
    */
    static struct BUTTON_ALL{
        short but_id;
        MENU_STATUS but_ret;    // Returned value when this button
                    // is picked
        const char *str;
    } tbl[]={
        { MENUBUT_YES,    MENU_YES,    MSG_U(B_YES,"Yes")    },
        { MENUBUT_NO,    MENU_NO,    MSG_U(B_NO,"No")    },
        { MENUBUT_OK,    MENU_OK,    MSG_U(B_OK,"Ok")    },
        { MENUBUT_ACCEPT,    MENU_ACCEPT,    MSG_U(B_ACCEPT,"Accept")    },
        { MENUBUT_CANCEL,    MENU_CANCEL,    MSG_U(B_CANCEL,"Cancel")    },
        { MENUBUT_QUIT,        MENU_QUIT,    MSG_U(B_QUIT,"Quit")    },
        { MENUBUT_SAVE,        MENU_SAVE,    MSG_U(B_SAVE,"Save")    },
        { MENUBUT_ADD,        MENU_ADD,    MSG_U(B_ADD,"Add")    },
        { MENUBUT_DEL,        MENU_DEL,    MSG_U(B_DEL,"Del")    },
        { MENUBUT_INS,        MENU_INS,    MSG_U(B_INS,"Ins")    },
        { MENUBUT_EDIT,        MENU_EDIT,    MSG_U(B_EDIT,"Edit")    },
        { MENUBUT_RESET,    MENU_RESET,    MSG_U(B_RESET,"Reset")    }
    };
    BUTTON_ALL *ptl = tbl;
    for (unsigned i=0; i<sizeof(tbl)/sizeof(tbl[0]); i++, ptl++){
        if ((ptl->but_id & _but_options) != 0
            && (ptl->but_id != MENUBUT_OK || _but_options == MENUBUT_OK)){
            /* #Specification: dialog / MENUBUT_OK / nerver displayed
                The button "Ok" is never shown except if it is the
                only button of the dialog. It is implied by an
                <enter> on a menu item. Initially it was shown but soon
                user have started complaining that it was useless.

                From the outside, it looks like a normal buttons, but
                deep in dialog/buttons.c, it is simply not shown.
            */
            tb[nb] = ptl->str;
            tbret[nb] = ptl->but_ret;
            nb++;
        }
    }
    helpfile.setfrom (_helpfile);
    if (!helpfile.is_empty()){
        tb[nb] = MSG_U(B_HELP,"Help");
        tbret[nb] = MENU_HELP;
        nb++;
    }
}

/*
    Setup the coordinate of each button in the dialog
*/
PUBLIC void BUTTONS_INFO::setup(
    int _y,        // Line where the buttons will be drawn
    int width)    // Width of the window
{
    if (nb > 0){
        y = _y;
        int onebut = width/nb;
        for (int i=0; i<nb; i++){
            const char *but = tb[i];
            tbx[i] = i*onebut + (onebut - strlen(but))/2 - 1;
        }
    }
}

/*
    Set the screen cursor on the active button
*/
PUBLIC void BUTTONS_INFO::setcursor (
    WINDOW *dialog,
    int button)    // Which buttons is currently selected
            // or -1 if none
{
    if (button != -1 && button < nb){
        int x = tbx[button];
        const char *but = tb[button];
        while (*but == ' '){
            but++;
            x++;
        }
        wmove (dialog,y,x+1);
    }
}

/*
    Draw all buttons
*/
PUBLIC void BUTTONS_INFO::draw(
    WINDOW *dialog,
    int button)        // Which buttons is currently selected
                // or -1 if none
{
    for (int i=0; i<nb; i++){
        print_button(dialog,tb[i],y,tbx[i]
            , button == i ? TRUE : FALSE);
    }
    setcursor (dialog,button);
}
PRIVATE void BUTTONS_INFO::help (WINDOW *win)
{
    char path[PATH_MAX];
    sprintf (path,"%s.help",helpfile.get());
    dialog_textbox (path,path);
    touchwin(stdscr);
    touchwin(win);
    dialog_clear ();
    refresh();
}

/*
    Process one key.
    This function is called when the focus is in the button section.
    It will process the help button by itself.

    It return -1 is nothing special happened. It return the number
    of the selected button otherwise. The called generally
    terminate then.
*/
PUBLIC MENU_STATUS BUTTONS_INFO::dokey(
    WINDOW *dialog,
    int key,
    int &selected,
    int other_focus)    // Is there something other that buttons
                // or something that require specific focus
{
    MENU_STATUS ret = MENU_NULL;
    int button = selected;
    key = toupper(key);

    if (key == TAB){
        button++;
        if (button == nb) button = -1;
    }else if (key == KEY_RIGHT){
        button++;
        if (button == nb) button = 0;
    }else if (key == KEY_LEFT){
        button--;
        if (button == -1) button = nb-1;
    }else if (key == '\n'){
        if (!helpfile.is_empty() && button == nb -1){
            help (dialog);
            button = -1;
        }else{
            ret = tbret[button];
        }
    }else if (key == KEY_F(1) && !helpfile.is_empty()){
        help (dialog);
        button = -1;
    }else if (key == 'Y' && (but_options & MENUBUT_YES)){
        ret = MENU_YES;
    }else if (key == 'N' && (but_options & MENUBUT_NO)){
        ret = MENU_NO;
    }
    if (!other_focus && button == -1) button = 0;
    draw(dialog,button);
    selected = button;
    return ret;
}