Merge branch 'ical'

[alpine.git] / pico / osdep / msdlg.c

#if     !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: msdlg.c 1025 2008-04-08 22:59:38Z hubert@u.washington.edu $";
#endif

/*
 * ========================================================================
 * Copyright 2006-2008 University of Washington
 * Copyright 2013-2017 Eduardo Chappa
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * ========================================================================
 */

/*---------------------------------------------------------------------------
 *
 *  Module: msdlg.c
 *
 * Thomas Unger
 * Networks and Distributed Computing
 * Computing and Communications
 * University of Washington
 * Administration Builiding, AG-44
 * Seattle, Washington, 98195, USA
 * Internet: tunger@cac.washington.edu
 *
 *
 * Pine and Pico are registered trademarks of the University of Washington.
 * No commercial use of these trademarks may be made without prior written
 * permission of the University of Washington.
 * 
 * Pine, Pico, and Pilot software and its included text are Copyright
 * 1989-1998 by the University of Washington.
 * 
 * The full text of our legal notices is contained in the file called
 * CPYRIGHT, included with this distribution.
 *
 *--------------------------------------------------------------------------*/

#define WIN31 
#define STRICT

#include <system.h>
#include <general.h>

#include <stdarg.h>
#include <ddeml.h>

#include "mswin.h"
#include "msmenu.h"
#include "resource.h"

#include "../estruct.h"
#include "../mode.h"
#include "../pico.h"
#include "../keydefs.h"
#include "../edef.h"
#include "../efunc.h"
#include "../utf8stub.h"
#include "../../pith/charconv/filesys.h"


extern HWND             ghTTYWnd;
extern HINSTANCE        ghInstance;
extern BOOL             gfUseDialogs;
extern FILE             *mswin_debugfile;
extern int              mswin_debug;
extern TCHAR            gszAppName[45];



#define BTN_FIRSTID     200
#define BSPACE          4
#define BWIDTH_MIN      120


typedef struct {
    LPTSTR      prompt;                 /* Prompt. */
    LPTSTR      string;                 /* Resulting string. */
    int         strlen;                 /* Length of buffer. */
    int         append;                 /* Append to existing string. */
    int         passwd;                 /* Passwd, don't echo (1 use asterisk, 10 space). */
    unsigned    flags;                  /* other flags. */
    int         dflt;
    int         cancel;
    int         button_count;           /* Number of additional buttons. */
    MDlgButton *button_list;            /* List of other buttons. */
    char      **helptext;               /* Help text. */
    char        helpkey;
    int         result;
} OEInfo;


static OEInfo   gOEInfo;                
static BOOL     gDoHelpFirst;
static WNDPROC  gpOldEditProc;          /* Old Edit window proc. */
static WNDPROC  gpEditProc; 
static WNDPROC  gpOldBtnProc;           /* Old Edit window proc. */
static WNDPROC  gpBtnProc; 




/*
 * Forward function declaratins.
 */
LONG FAR PASCAL __export   EditProc(HWND hBtn, UINT msg, WPARAM wParam, 
                                        LPARAM lParam);
LONG FAR PASCAL __export   ButtonProc(HWND hBtn, UINT msg, WPARAM wParam, 
                                        LPARAM lParam);
BOOL CALLBACK  __export    mswin_dialog_proc (HWND hDlg, UINT uMsg, 
                                        WPARAM wParam, LPARAM lParam);
BOOL CALLBACK  __export    mswin_select_proc (HWND hDlg, UINT uMsg, 
                                        WPARAM wParam, LPARAM lParam);
LONG FAR PASCAL __export   KBCProc (HWND hWnd, UINT uMsg, WPARAM wParam, 
                                        LPARAM lParam);

                                
static void             BuildButtonList (HWND, MDlgButton *, int, MDlgButton *);
static BOOL             ProcessChar (HWND, WPARAM, OEInfo *, long *);
static void             GetBtnPos (HWND, HWND, RECT *);

int  mswin_yesno_lptstr (LPTSTR);

                        
int
mswin_usedialog (void)
{
    return (gfUseDialogs);
}
                        
                        

/*---------------------------------------------------------------------- 


  Generic text entry.  Prompt user for a string.
          

  Args:
        prompt -- The string to prompt with
        string -- the buffer result is returned in, and original string (if 
                   any) is passed in.
        field_len -- Maximum length of string to accept
        append_current -- flag indicating string should not be truncated before
                          accepting input
        passwd -- a pass word is being fetch. Don't echo on screen
        button_list -- pointer to array of mDlgButton's.  input chars matching
                       those in list return value from list.  Nearly identical
                       to Pine's ESCKEY structure.
        help   -- Arrary of strings for help text in bottom screen lines
        flags  -- flags

  Result:  editing input string
            returns -1 unexpected errors
            returns 0  typed CR or pressed "OK"
            returns 1  typed ESC or pressed "Cancel"
            returns 3  typed ^G or PF1 (help)
            returns 4  typed ^L for a screen redraw
           or one of the other return values defined in button_list.

  WARNING: Care is required with regard to the escape_list processing.
           The passed array is terminated with an entry that has ch = -1.
           Function key labels and key strokes need to be setup externally!
           Traditionally, a return value of 2 is used for ^T escapes.
                   
                   
  Note About Help:  We don't get the help text on the first call.  If we
          want help text we have to return 3.  We'll get called again
          with help text.  To make it look good, we want to display
          this the second time we're called.  But we don't want to
          display the help text every time we're called with help
          text.  To know the difference we set gDoHelpFirst when
          exiting to request help text.  If this is set then we
          display help.  If not, then no help.


----------------------------------------------------------------------*/
                        
                        
/* 
 * xxx implement flags.
 * xxx   display.d uses flags QFFILE, QDEFLT, and QBOBUF
 */

int
mswin_dialog(UCS *prompt, UCS *buf, int nbuf, int append_current,
             int passwd, MDlgButton *button_list, char **help, unsigned flags)
{
    DLGPROC     dlgprc;
    int         c;
    LPTSTR      promptlpt, buflpt, b;
    UCS        *ucs;
    
    mswin_flush();
    
    promptlpt = ucs4_to_lptstr(prompt);
    buflpt = (LPTSTR) fs_get(nbuf * sizeof(TCHAR));
    b = ucs4_to_lptstr(buf);
    if(b){
        int i;

        for(i = 0; i < nbuf && b[i]; i++)
          buflpt[i] = b[i];

        if(i < nbuf)
          buflpt[i] = 0;

        buflpt[nbuf-1] = 0;
        fs_give((void **) &b);
    }

    gOEInfo.prompt      = promptlpt;
    gOEInfo.string      = buflpt;
    gOEInfo.strlen      = nbuf;
    gOEInfo.append      = append_current;
    gOEInfo.passwd      = passwd;
    gOEInfo.helptext    = help;
    gOEInfo.helpkey     = 0x07; /* ^G */
    gOEInfo.flags       = flags;
    gOEInfo.button_list = button_list;
    gOEInfo.result      = 0;

    for (c = 0; button_list && button_list[c].ch != -1; ++c)
      ;

    gOEInfo.button_count = c;

    gpEditProc = (WNDPROC) MakeProcInstance((FARPROC) EditProc, ghInstance);
    gpBtnProc = (WNDPROC) MakeProcInstance((FARPROC) ButtonProc, ghInstance);
    dlgprc = (DLGPROC) MakeProcInstance((FARPROC) mswin_dialog_proc, ghInstance);

    DialogBox(ghInstance, MAKEINTRESOURCE (IDD_OPTIONALYENTER), ghTTYWnd, dlgprc);

    FreeProcInstance((FARPROC) dlgprc);
    FreeProcInstance((FARPROC) gpBtnProc);
    FreeProcInstance((FARPROC) gpEditProc);

    if(promptlpt)
      fs_give((void **) &promptlpt);

    ucs = lptstr_to_ucs4(buflpt);
    if(ucs){
        int i;

        for(i = 0; i < nbuf && ucs[i]; i++)
          buf[i] = ucs[i];

        if(i < nbuf)
          buf[i] = '\0';

        buf[nbuf-1] = '\0';
        fs_give((void **) &ucs);
    }

    return(gOEInfo.result);
}
                

        
        
/*
 * Dialog procedure for the generic text entry dialog box.
 */
BOOL CALLBACK  __export 
mswin_dialog_proc (HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    BOOL        ret = FALSE;
    int         i;
    int         biCount;
    HWND        hEdit;
    MDlgButton  built_in[3];
    long        l;
    
    
    switch (uMsg) {
    case WM_INITDIALOG:
        /*
         * Set the prompt text.
         */
        SetDlgItemText(hDlg, IDC_PROMPT, gOEInfo.prompt);

        /*
         * Set the initial edit text and configure the edit control
         */
        if (!gOEInfo.append)
            *gOEInfo.string = '\0';

        SetDlgItemText(hDlg, IDC_RESPONCE, gOEInfo.string);

        SendDlgItemMessage (hDlg, IDC_RESPONCE, EM_SETPASSWORDCHAR,
                (gOEInfo.passwd == 1) ? '*' : gOEInfo.passwd ? ' ' : 0, 0L);
        SendDlgItemMessage (hDlg, IDC_RESPONCE, EM_LIMITTEXT, 
                gOEInfo.strlen - 1, 0L);
        l = (long) lstrlen(gOEInfo.string);
        SendDlgItemMessage(hDlg, IDC_RESPONCE, EM_SETSEL, 0, l);
        hEdit = GetDlgItem (hDlg, IDC_RESPONCE);
        SetFocus (hEdit);
        gpOldEditProc = (WNDPROC) GetWindowLong (hEdit, GWL_WNDPROC);
        SetWindowLong (hEdit, GWL_WNDPROC, (DWORD)(FARPROC)gpEditProc);
        
        
        /*
         * Subclass the standard buttons and build buttons for each item 
         * in the button_list.
         */
        gpOldBtnProc = (WNDPROC) GetWindowLong (GetDlgItem (hDlg, IDOK), GWL_WNDPROC);
        SetWindowLong (GetDlgItem (hDlg, IDOK), GWL_WNDPROC, 
                                        (DWORD)(FARPROC)gpBtnProc);
        SetWindowLong (GetDlgItem (hDlg, IDCANCEL), GWL_WNDPROC, 
                                        (DWORD)(FARPROC)gpBtnProc);

        memset (&built_in, 0, sizeof (built_in));
        built_in[0].id = IDOK;
        built_in[1].id = IDCANCEL;
        if (1) {
            built_in[2].id = IDC_GETHELP;
            biCount = 3;
        }
        else {
            DestroyWindow (GetDlgItem (hDlg, IDC_GETHELP));
            biCount = 2;
        }
        BuildButtonList (hDlg, built_in, biCount, gOEInfo.button_list);

        
        if (gOEInfo.helptext && gDoHelpFirst) {
            mswin_showhelpmsg ((WINHAND)hDlg, gOEInfo.helptext);
            gDoHelpFirst = FALSE;
        }
        return (0);
        

    case WM_ACTIVATE:
        /*
         * Keep focus on the edit item so key strokes are always
         * received.
         */
        SetFocus (GetDlgItem (hDlg, IDC_RESPONCE));
        break;

        
    case WM_COMMAND:
        switch (wParam) {
        case IDOK:
            /*
             * Normal exit.  Accept the new text. 
             */
            GetDlgItemText(hDlg, IDC_RESPONCE, gOEInfo.string, gOEInfo.strlen);

            gOEInfo.result = 0;
            EndDialog (hDlg, gOEInfo.result);
            ret = TRUE;
            break;
            
        case IDCANCEL:
            /*
             * Cancel operation.  Don't retreive new text.
             */
            gOEInfo.result = 1;
            EndDialog (hDlg, gOEInfo.result);
            ret = TRUE;
            break;
            
        case IDC_GETHELP:
            /*
             * Get help.  If we have help text display it.  If not,
             * return value 3, which tells the caller to provide us
             * with help text.
             */
            if (gOEInfo.helptext != NULL) {
                mswin_showhelpmsg ((WINHAND)hDlg, gOEInfo.helptext);
            }
            else {
                GetDlgItemText(hDlg, IDC_RESPONCE, gOEInfo.string, gOEInfo.strlen);
                gOEInfo.result = 3;
                gDoHelpFirst = TRUE;
                EndDialog (hDlg, gOEInfo.result);
            }
            ret = TRUE;
            break;
            
        default:
            /*
             * Search button list for button with this ID.  If found
             * return it's result code.  Retreive text.
             */
            if (  wParam >= BTN_FIRSTID && 
                  wParam < BTN_FIRSTID + (WPARAM) gOEInfo.button_count) {
                GetDlgItemText(hDlg, IDC_RESPONCE, gOEInfo.string, gOEInfo.strlen);
                i = wParam - BTN_FIRSTID;
                gOEInfo.result = gOEInfo.button_list[i].rval;
                EndDialog (hDlg, gOEInfo.result);
                ret = TRUE;
            }
        }
        
    }
    return (ret) ;
}




/*
 * Subclassed window procedure for Edit control on generic text
 * entry dialog box.
 */
LONG FAR PASCAL __export
EditProc (HWND hEdit, UINT msg, WPARAM wParam, LPARAM lParam)
{
    HWND        hDlg;
    LONG        ret;
    
    hDlg = GetParent (hEdit);
    
    if (msg == WM_GETDLGCODE) {
        /*
         * Tell windows that we want to receive ALL keystrokes.
         */
        ret = CallWindowProc (gpOldEditProc, hEdit, msg, wParam, lParam);
        ret |= DLGC_WANTALLKEYS;
        return (ret);
    }
    

    if (msg == WM_CHAR) {
        /*
         * See if the character typed is a shortcut for any of the
         * buttons.
         */
        if (ProcessChar (hDlg, wParam, &gOEInfo, &ret)) 
             return (ret);
        
        /* No... Fall through for deault processing. */
    }

    return (CallWindowProc (gpOldEditProc, hEdit, msg, wParam, lParam));
}




/*
 * Subclass button windows.
 *
 * These buttons will automatically return the input focus to 
 * a control with id IDC_RESPONCE.
 */
LONG FAR PASCAL __export
ButtonProc (HWND hBtn, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    HWND        hDlg;
    LONG        ret;
    

    if (uMsg == WM_LBUTTONUP || uMsg == WM_MBUTTONUP || uMsg == WM_RBUTTONUP) {
        /*
         * On mouse button up restore input focus to IDC_RESPONCE, which
         * processes keyboard input.
         */
        ret = CallWindowProc (gpOldBtnProc, hBtn, uMsg, wParam, lParam);
        hDlg = GetParent (hBtn);
        SetFocus (GetDlgItem (hDlg, IDC_RESPONCE));
        return (ret);
    }
    
    return (CallWindowProc (gpOldBtnProc, hBtn, uMsg, wParam, lParam));
}



int
mswin_yesno(UCS *prompt_ucs4)
{
    int ret;
    LPTSTR prompt_lptstr;

    prompt_lptstr = ucs4_to_lptstr(prompt_ucs4);
    ret = mswin_yesno_lptstr(prompt_lptstr);
    fs_give((void **) &prompt_lptstr);

    return(ret);
}

    
int
mswin_yesno_utf8(char *prompt_utf8)
{
    int ret;
    LPTSTR prompt_lptstr;

    prompt_lptstr = utf8_to_lptstr(prompt_utf8);
    ret = mswin_yesno_lptstr(prompt_lptstr);
    fs_give((void **) &prompt_lptstr);

    return(ret);
}

/*
 * Ask a yes/no question with the MessageBox procedure.
 *
 * Returns:
 *      0       - Cancel operation.
 *      1       - "Yes" was selected.
 *      2       - "No" was selected.
 */
int
mswin_yesno_lptstr(LPTSTR prompt) 
{
    int         ret;
    
    mswin_flush ();
    
    mswin_killsplash();

    ret = MessageBox (ghTTYWnd, prompt, gszAppName, 
                MB_APPLMODAL | MB_ICONQUESTION | MB_YESNOCANCEL);
        
    switch (ret) {
    case IDYES:                         ret = 1;        break;
    case IDNO:                          ret = 2;        break;
    default:
    case IDCANCEL:                      ret = 0;        break;
    }
    return (ret);
}


/*---------------------------------------------------------------------- 


  Generic selection routine.  Display a prompt and a set of buttons for
  each possible answer.
          
          

  Args:
        prompt          -- The string to prompt with.
        button_list     -- pointer to array of mDlgButton's.  input chars 
                           matching those in list return value from
                           mlist.  Nearly identical to Pine's ESCKEY
                           mstructure.
        dflt            -- Value returned when "Enter" is pressed.
        on_ctrl_C       -- Value returned to cancel dialog (ESC).
        help            -- Arrary of strings for help text in bottom screen 
                           lines
        flags           -- flags

  Result:  
        dflt            -- Default option selected.
        on_ctrl_C       -- Calcel operation.
        or one of the other return values defined in button_list.
                
                
Note:  To prcess keyboard in put we use a custom dialog control
       which is invisible but always has the input focus.

----------------------------------------------------------------------*/

int
mswin_select(char *utf8prompt, MDlgButton *button_list, int dflt, int on_ctrl_C, 
             char **help, unsigned flags)
{
    WNDCLASS    wndclass;
    DLGPROC     dlgprc;
    WNDPROC     kbcProc;
    int         c;
    LPTSTR      promptlpt;

    mswin_flush ();

    promptlpt = utf8_to_lptstr(utf8prompt);
    
    /*
     * Setup dialog config structure.
     */
    gOEInfo.prompt = promptlpt;
    gOEInfo.string = NULL;
    gOEInfo.strlen = 0;
    gOEInfo.append = 0;
    gOEInfo.passwd = 0;
    gOEInfo.helptext = help;
    gOEInfo.helpkey = 'g';
    gOEInfo.dflt = dflt;
    gOEInfo.cancel = on_ctrl_C;
    gOEInfo.flags = flags;
    gOEInfo.button_list = button_list;
    gOEInfo.result = 0;

    /*
     * Count the buttons.
     */
    for(c = 0; button_list && button_list[c].ch != -1; ++c)
      ;

    gOEInfo.button_count = c;

    /*
     * Register the class for the user control which will receive keyboard
     * input events.
     */
    kbcProc = (WNDPROC) MakeProcInstance((FARPROC) KBCProc, ghInstance);
    wndclass.style = 0;
    wndclass.lpfnWndProc = kbcProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = ghInstance;
    wndclass.hIcon = NULL;
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = 0;
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = TEXT("KeyboardCapture");

    if(RegisterClass (&wndclass) == 0){
        /*
         * There is no good return value to indicate an error.  
         * Cancel the operation.
         */
        return(on_ctrl_C);
    }

    /*
     * Make other procedure instances.
     */
    dlgprc = (DLGPROC) MakeProcInstance((FARPROC) mswin_select_proc, ghInstance);
    gpBtnProc = (WNDPROC) MakeProcInstance((FARPROC) ButtonProc, ghInstance);
                            
    /*
     * Bring up the dialog box.
     */
    DialogBox(ghInstance, MAKEINTRESOURCE(IDD_SELECT), ghTTYWnd, dlgprc);
                    
    /*
     * Free the proc instances and window class.
     */
    FreeProcInstance((FARPROC) dlgprc);
    FreeProcInstance((FARPROC) gpBtnProc);
    UnregisterClass (TEXT("KeyboardCapture"), ghInstance);
    FreeProcInstance((FARPROC) kbcProc);

    if(promptlpt)
      fs_give((void **) &promptlpt);

    return(gOEInfo.result);
}
                

        
        
/*
 * Dialog procedure for the button selection dialog box.
 */
BOOL CALLBACK  __export 
mswin_select_proc (HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    BOOL        ret = FALSE;
    int         i;
    int         biCount;
    MDlgButton  built_in[3];
    
    if (mswin_debug >= 1)
        fprintf (mswin_debugfile, "Select:  uMsg x%x (%d), wParam x%x, lParam x%lx\n",
                uMsg, uMsg, wParam, lParam);
    
    
    switch (uMsg) {
    case WM_INITDIALOG:
        /*
         * Show the prompt.
         */
        SetDlgItemText(hDlg, IDC_PROMPT, gOEInfo.prompt);

        /*
         * Set focus to the invisible custom control
         */
        SetFocus (GetDlgItem (hDlg, IDC_RESPONCE));
        
        /*
         * Subclass the standard buttons and build buttons for each item 
         * in the button_list.
         */
        gpOldBtnProc = (WNDPROC) GetWindowLong (GetDlgItem (hDlg, IDCANCEL), GWL_WNDPROC);
        SetWindowLong (GetDlgItem (hDlg, IDC_GETHELP), GWL_WNDPROC, 
                                        (DWORD)(FARPROC)gpBtnProc);
        SetWindowLong (GetDlgItem (hDlg, IDCANCEL), GWL_WNDPROC, 
                                        (DWORD)(FARPROC)gpBtnProc);

        memset (&built_in, 0, sizeof (built_in));
        built_in[0].id = IDCANCEL;
        if (gOEInfo.helptext != NULL) {
            built_in[1].id = IDC_GETHELP;
            biCount = 2;
        }
        else {
            DestroyWindow (GetDlgItem (hDlg, IDC_GETHELP));
            gOEInfo.helpkey = 0;
            biCount = 1;
        }
        BuildButtonList (hDlg, built_in, biCount, gOEInfo.button_list);
        gDoHelpFirst = FALSE;
        return (0);
        
        
    case WM_ACTIVATE:
        /*
         * Keep focus on the custom control item so key strokes are always
         * received.
         */
        SetFocus (GetDlgItem (hDlg, IDC_RESPONCE));
        break;

        
    case WM_COMMAND:
        switch (wParam) {
        case IDOK:
            gOEInfo.result = gOEInfo.dflt;
            EndDialog (hDlg, gOEInfo.result);
            ret = TRUE;
            break;
            
        case IDCANCEL:
            gOEInfo.result = gOEInfo.cancel;
            EndDialog (hDlg, gOEInfo.result);
            ret = TRUE;
            break;

        case IDC_GETHELP:
            /*
             * Get help.  If we have help text display it.  If not,
             * return value 3, which tells the caller to provide us
             * with help text.
             */
            if (gOEInfo.helptext != NULL) {
                mswin_showhelpmsg ((WINHAND) hDlg, gOEInfo.helptext);
            }
            ret = TRUE;
            break;
            
        default:
            if (  wParam >= BTN_FIRSTID && 
                  wParam < BTN_FIRSTID + (WPARAM) gOEInfo.button_count) {
                i = wParam - BTN_FIRSTID;
                gOEInfo.result = gOEInfo.button_list[i].rval;
                EndDialog (hDlg, gOEInfo.result);
                ret = TRUE;
            }
        }
        
    }
    return (ret) ;
}



/*
 * Window procedure for the hidden custom control.
 */
LONG FAR PASCAL __export
KBCProc (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    LONG        ret;
    

    if (uMsg == WM_GETDLGCODE) {
        /*
         * Tell windows that we want all the character messages.
         */
        ret = DefWindowProc (hWnd, uMsg, wParam, lParam);
        ret |= DLGC_WANTALLKEYS;
        return (ret);
    }

    
    if (uMsg == WM_CHAR) {
        /*
         * See if the character typed is a shortcut for any of the
         * buttons.
         */
        if (ProcessChar (GetParent (hWnd), wParam, &gOEInfo, &ret)) 
             return (ret);

        /* Fall through for default processing. */
    }
    
    return (DefWindowProc (hWnd, uMsg, wParam, lParam));
}






/*
 * Check if character activates any button.  If it does, send WM_COMMAND
 * to target window.
 *
 * Args:
 *      hWnd    - Window to send message to.
 *      wParam  - character typed.
 *      oeinfo  - dialog config structure.  Contains button list.
 *      ret     - value to return to windows.
 *
 * Returns:
 *      TRUE    - Found a match.  Exit from Window Procedure returning
 *                *ret to windows.
 *
 *      FALSE   - No match.  Continue with default processing of character
 *                message.
 *
 */
static BOOL
ProcessChar (HWND hWnd, WPARAM wParam, OEInfo *oeinfo, long *ret)
{
    int         i;
    int         id;
    
        
    *ret = 0;
    if (wParam == 0x0d) {
        /*
         * "Enter" is same as clicking on OK button.
         */
        PostMessage (hWnd, WM_COMMAND, IDOK,
                    MAKELONG (GetDlgItem (hWnd, IDOK), 1));
        return (TRUE);
    }
    if (wParam == 0x1b || wParam == 0x03) {
        /*
         * Esc is same as clicking on Cancel button.
         */
        PostMessage (hWnd, WM_COMMAND, IDCANCEL,
                    MAKELONG (GetDlgItem (hWnd, IDCANCEL), 1));
        return (TRUE);
    }

    /*
     * Any of the custom buttons respond to this key?
     */
    for (i = 0; i < oeinfo->button_count; ++i) {
        if (wParam == oeinfo->button_list[i].ch) {
            id = oeinfo->button_list[i].id;
            PostMessage (hWnd, WM_COMMAND, id,
                    MAKELONG (GetDlgItem (hWnd, id), 1));
            return (TRUE);
        }
    }
    
    /*
     * Lastly, is it the help key?
     */
    if (oeinfo->helpkey != 0 && wParam == oeinfo->helpkey) {
        id = IDC_GETHELP;
        PostMessage (hWnd, WM_COMMAND, id,
                MAKELONG (GetDlgItem (hWnd, id), 1));
        return (TRUE);
    }

    
    /*
     * Nothing we understand.
     */
    return (FALSE);
}





/*
 * Get a button position in the parent's coordinate space.
 */
static void
GetBtnPos (HWND hPrnt, HWND hWnd, RECT *r)
{
    GetWindowRect (hWnd, r);
    ScreenToClient (hPrnt, (POINT *) r);
    ScreenToClient (hPrnt, (POINT *) &r->right);
}




/*
 * Add buttons to the dialog box.
 */
static void
BuildButtonList(HWND hDlg, MDlgButton *built_in, int biCount, MDlgButton *button_list)
{
    RECT        rDlg, rb1, rb2, r;
    HDC         hdc;
    MDlgButton  *pB;                            /* pointer to button struct*/
    HWND        hBtn, hBtn1, hBtn2;             /* handle to buttons */
    int         btnCount;                       /* extra button count */
    int         rows, cols;                     /* button rows and columns */
    int         bpos;                           /* button position */
    int         i;
    int         maxstrIdx, maxstrLen;           /* button w/ longest caption*/
    DWORD       textExtent;                     /* width of button caption */
    int         margine;                        /* left and right margines */
    int         btop, bleft;                    /* button position */
    int         bwidth, bheight, w;             /* button size */
    int         bMinWidth;                      /* minimum buttonwidth */
    int         bvertSpace, bhorzSpace;         /* button spacing */
    int         newWHeight, delta;              /* window resizing */
    TCHAR       caption[128];
    size_t      ncaption;
    HFONT       btnFont;
    SIZE        size;
    
    /*
     * Are there any buttons to add?
     */
    if(button_list == NULL)
      return;

    maxstrIdx = 0;
    for(btnCount = 0; button_list[btnCount].ch != -1; ++btnCount){
        if(lstrlen(button_list[btnCount].label) > 
                lstrlen(button_list[maxstrIdx].label)) 
          maxstrIdx = btnCount;
    }

    if(btnCount == 0)
      return;


    /* 
     * Get the size of the dialog box and the positions of the
     * first and, if there is one, the second button.  Calculate or
     * default button offsets and positions.
     */
    GetClientRect(hDlg, &rDlg);
    hBtn1 = GetDlgItem(hDlg, built_in[0].id);
    GetBtnPos(hDlg, hBtn1, &rb1);
    margine = rb1.left;                         /* left and right margine */
    bheight = rb1.bottom - rb1.top;             /* button width */
    bwidth  = rb1.right - rb1.left;             /* button height. */
    if(biCount > 1){
        hBtn2 = GetDlgItem(hDlg, built_in[1].id);
        GetBtnPos(hDlg, hBtn2, &rb2);
        bvertSpace = rb2.top - rb1.top;         /* vertical spacing */
    }
    else{
        bvertSpace = bheight + BSPACE;          /* vertical spacing */
    }
    
    
    /*
     * Get the button font.
     */
    btnFont = (HFONT) SendMessage (hBtn1, WM_GETFONT, 0, 0);
        
    /*
     * Get the screen extent of the longest button label.  min width
     * is the extent, plus the average width of 5 extra characters for
     * key stroke, plus margine.
     */
    hdc = GetDC (hBtn1);
    ncaption = sizeof(caption)/sizeof(TCHAR);
    _sntprintf(caption, ncaption, TEXT("%s '%s'"), button_list[maxstrIdx].label, 
                                  button_list[maxstrIdx].name);

    maxstrLen = lstrlen(caption);
    GetTextExtentPoint32(hdc, caption, maxstrLen, &size);

    textExtent = size.cx;

    ReleaseDC(hBtn1, hdc);
    bMinWidth = LOWORD (textExtent) + (2 * (LOWORD(textExtent) / maxstrLen));
    if(bwidth < bMinWidth)
        bwidth = bMinWidth;
    
    /*
     * Calculate button positions.  If the buttons are going to extend
     * past the right edge of the dialog box, shrink their width.  But
     * if they get narrower than the min width calculated above then
     * increase the number of rows.
     */
    rows = 1;
    do {
        ++rows;                                 /* More rows. */
        w = bwidth;                             /* Original button width. */
        cols = 1 + ((biCount + btnCount) - 1) / rows;   /* Calc num cols. */

        /* Need to srink button width? */
        if (2 * margine + bwidth * cols + BSPACE * (cols - 1) > rDlg.right) {
            w = ((rDlg.right - (2 * margine)) - (BSPACE * (cols-1))) / cols;
        }
        /* Did buttons get too narrow? */
    } while (w < bMinWidth && cols > 1);

    bwidth = w;
    bhorzSpace = bwidth + BSPACE;               /* horizontal spacing */
    
    
    /* 
     * Resize window. 
     */
    newWHeight = rb1.top + (rows * bvertSpace);
    delta = newWHeight - rDlg.bottom;
    if (delta != 0) {
        GetWindowRect (hDlg, &r);
        MoveWindow (hDlg, r.left, r.top, r.right - r.left, 
                (r.bottom - r.top) + delta, FALSE);
    }
        


    /*
     * Create new buttons.
     */
    for(bpos = 0; bpos < biCount + btnCount; ++bpos) {
        /*
         * Calculate position for this button.
         */
        btop  = rb1.top  + (bpos % rows) * bvertSpace;
        bleft = rb1.left + (bpos / rows) * bhorzSpace;
        
        if(bpos < biCount){
            /* 
             * Resize existing buttons. 
             */
            MoveWindow(GetDlgItem(hDlg, built_in[bpos].id), 
                       bleft, btop, bwidth, bheight, FALSE);
        }
        else{
            i = bpos - biCount;
            pB = &button_list[i];

            _sntprintf(caption, ncaption, TEXT("%s '%s'"), pB->label, pB->name);
            hBtn = CreateWindow(TEXT("BUTTON"), caption, 
                    WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 
                    bleft, btop, bwidth, bheight, 
                    hDlg, NULL, ghInstance, NULL);

            pB->id = BTN_FIRSTID + i;
            SetWindowLong(hBtn, GWL_ID, pB->id);
            SendMessage(hBtn, WM_SETFONT, (WPARAM)btnFont, MAKELPARAM (0, 0));

            /* Subclass button. */
            SetWindowLong(hBtn, GWL_WNDPROC, (DWORD)(FARPROC)gpBtnProc);
            EnableWindow(hBtn, TRUE);
        }
    }
}