src/c_tk_base_7_5_w_mods/tkwindialog.c

/* $Header$ */

/*
 * tkWinDialog.c --
 *
 *      Contains the Windows implementation of the common dialog boxes.
 *
 * Copyright (c) 1996-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkwindialog.c,v 1.1.1.1 2001/06/13 05:12:25 dtashley Exp $
 *
 */

#include "tkWinInt.h"
#include "tkFileFilter.h"

#include <commdlg.h>    /* includes common dialog functionality */
#include <dlgs.h>       /* includes common dialog template defines */
#include <cderr.h>      /* includes the common dialog error codes */

typedef struct ThreadSpecificData { 
    int debugFlag;            /* Flags whether we should output debugging 
                               * information while displaying a builtin 
                               * dialog. */
    Tcl_Interp *debugInterp;  /* Interpreter to used for debugging. */
    UINT WM_LBSELCHANGED;     /* Holds a registered windows event used for
                               * communicating between the Directory
                               * Chooser dialog and its hook proc. */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

/*
 * The following structures are used by Tk_MessageBoxCmd() to parse 
 * arguments and return results.
 */

static const TkStateMap iconMap[] = {
    {MB_ICONERROR,              "error"},
    {MB_ICONINFORMATION,        "info"},
    {MB_ICONQUESTION,           "question"},
    {MB_ICONWARNING,            "warning"},
    {-1,                        NULL}
};
          
static const TkStateMap typeMap[] = {
    {MB_ABORTRETRYIGNORE,       "abortretryignore"},
    {MB_OK,                     "ok"},
    {MB_OKCANCEL,               "okcancel"},
    {MB_RETRYCANCEL,            "retrycancel"},
    {MB_YESNO,                  "yesno"},
    {MB_YESNOCANCEL,            "yesnocancel"},
    {-1,                        NULL}
};

static const TkStateMap buttonMap[] = {
    {IDABORT,                   "abort"},
    {IDRETRY,                   "retry"},
    {IDIGNORE,                  "ignore"},
    {IDOK,                      "ok"},
    {IDCANCEL,                  "cancel"},
    {IDNO,                      "no"},
    {IDYES,                     "yes"},
    {-1,                        NULL}
};

static const int buttonFlagMap[] = {
    MB_DEFBUTTON1, MB_DEFBUTTON2, MB_DEFBUTTON3, MB_DEFBUTTON4
};

static const struct {int type; int btnIds[3];} allowedTypes[] = {
    {MB_ABORTRETRYIGNORE,       {IDABORT, IDRETRY,  IDIGNORE}},
    {MB_OK,                     {IDOK,    -1,       -1      }},
    {MB_OKCANCEL,               {IDOK,    IDCANCEL, -1      }},
    {MB_RETRYCANCEL,            {IDRETRY, IDCANCEL, -1      }},
    {MB_YESNO,                  {IDYES,   IDNO,     -1      }},
    {MB_YESNOCANCEL,            {IDYES,   IDNO,     IDCANCEL}}
};

#define NUM_TYPES (sizeof(allowedTypes) / sizeof(allowedTypes[0]))

/*
 * The following structure is used to pass information between the directory
 * chooser procedure, Tk_ChooseDirectoryObjCmd(), and its dialog hook proc.
 */

typedef struct ChooseDir {
    Tcl_Interp *interp;         /* Interp, used only if debug is turned on, 
                                 * for setting the "tk_dialog" variable. */
    int lastCtrl;               /* Used by hook proc to keep track of last
                                 * control that had input focus, so when OK
                                 * is pressed we know whether to browse a
                                 * new directory or return. */
    int lastIdx;                /* Last item that was selected in directory 
                                 * browser listbox. */
    TCHAR path[MAX_PATH];       /* On return from choose directory dialog, 
                                 * holds the selected path.  Cannot return 
                                 * selected path in ofnPtr->lpstrFile because
                                 * the default dialog proc stores a '\0' in 
                                 * it, since, of course, no _file_ was 
                                 * selected. */
} ChooseDir;

/*
 * Definitions of procedures used only in this file.
 */

static UINT APIENTRY    ChooseDirectoryHookProc(HWND hdlg, UINT uMsg, 
                            WPARAM wParam, LPARAM lParam);
static UINT CALLBACK    ColorDlgHookProc(HWND hDlg, UINT uMsg, WPARAM wParam,
                            LPARAM lParam);
static int              GetFileNameA(ClientData clientData, 
                            Tcl_Interp *interp, int objc, 
                            Tcl_Obj *CONST objv[], int isOpen);
static int              GetFileNameW(ClientData clientData, 
                            Tcl_Interp *interp, int objc, 
                            Tcl_Obj *CONST objv[], int isOpen);
static int              MakeFilter(Tcl_Interp *interp, char *string, 
                            Tcl_DString *dsPtr);
static UINT APIENTRY    OFNHookProc(HWND hdlg, UINT uMsg, WPARAM wParam, 
                            LPARAM lParam);
static UINT APIENTRY    OFNHookProcW(HWND hdlg, UINT uMsg, WPARAM wParam, 
                            LPARAM lParam);
static void             SetTkDialog(ClientData clientData);
static int              TrySetDirectory(HWND hwnd, const TCHAR *dir);

/*
 *-------------------------------------------------------------------------
 *
 * TkWinDialogDebug --
 *
 *      Function to turn on/off debugging support for common dialogs under
 *      windows.  The variable "tk_debug" is set to the identifier of the
 *      dialog window when the modal dialog window pops up and it is safe to 
 *      send messages to the dialog.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      This variable only makes sense if just one dialog is up at a time.
 *
 *-------------------------------------------------------------------------
 */

void            
TkWinDialogDebug(
    int debug)
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    tsdPtr->debugFlag = debug;
}

/*
 *-------------------------------------------------------------------------
 *
 * Tk_ChooseColorObjCmd --
 *
 *      This procedure implements the color dialog box for the Windows
 *      platform. See the user documentation for details on what it
 *      does.
 *
 * Results:
 *      See user documentation.
 *
 * Side effects:
 *      A dialog window is created the first time this procedure is called.
 *      This window is not destroyed and will be reused the next time the
 *      application invokes the "tk_chooseColor" command.
 *
 *-------------------------------------------------------------------------
 */

int
Tk_ChooseColorObjCmd(clientData, interp, objc, objv)
    ClientData clientData;      /* Main window associated with interpreter. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
{
    Tk_Window tkwin, parent;
    HWND hWnd;
    int i, oldMode, winCode;
    CHOOSECOLOR chooseColor;
    static inited = 0;
    static COLORREF dwCustColors[16];
    static long oldColor;               /* the color selected last time */
    static char *optionStrings[] = {
        "-initialcolor",    "-parent",      "-title",       NULL
    };
    enum options {
        COLOR_INITIAL,      COLOR_PARENT,   COLOR_TITLE
    };

    if (inited == 0) {
        /*
         * dwCustColors stores the custom color which the user can
         * modify. We store these colors in a static array so that the next
         * time the color dialog pops up, the same set of custom colors
         * remain in the dialog.
         */
        for (i = 0; i < 16; i++) {
            dwCustColors[i] = RGB(255-i * 10, i, i * 10);
        }
        oldColor = RGB(0xa0, 0xa0, 0xa0);
        inited = 1;
    }

    tkwin = (Tk_Window) clientData;

    parent                      = tkwin;
    chooseColor.lStructSize     = sizeof(CHOOSECOLOR);
    chooseColor.hwndOwner       = NULL;                 
    chooseColor.hInstance       = NULL;
    chooseColor.rgbResult       = oldColor;
    chooseColor.lpCustColors    = dwCustColors;
    chooseColor.Flags           = CC_RGBINIT | CC_FULLOPEN | CC_ENABLEHOOK;
    chooseColor.lCustData       = (LPARAM) NULL;
    chooseColor.lpfnHook        = ColorDlgHookProc;
    chooseColor.lpTemplateName  = (LPTSTR) interp;

    for (i = 1; i < objc; i += 2) {
        int index;
        char *string;
        Tcl_Obj *optionPtr, *valuePtr;

        optionPtr = objv[i];
        valuePtr = objv[i + 1];

        if (Tcl_GetIndexFromObj(interp, optionPtr, optionStrings, "option",
                TCL_EXACT, &index) != TCL_OK) {
            return TCL_ERROR;
        }
        if (i + 1 == objc) {
            string = Tcl_GetStringFromObj(optionPtr, NULL);
            Tcl_AppendResult(interp, "value for \"", string, "\" missing", 
                    (char *) NULL);
            return TCL_ERROR;
        }

        string = Tcl_GetStringFromObj(valuePtr, NULL);
        switch ((enum options) index) {
            case COLOR_INITIAL: {
                XColor *colorPtr;

                colorPtr = Tk_GetColor(interp, tkwin, string);
                if (colorPtr == NULL) {
                    return TCL_ERROR;
                }
                chooseColor.rgbResult = RGB(colorPtr->red / 0x100, 
                        colorPtr->green / 0x100, colorPtr->blue / 0x100);
                break;
            }
            case COLOR_PARENT: {
                parent = Tk_NameToWindow(interp, string, tkwin);
                if (parent == NULL) {
                    return TCL_ERROR;
                }
                break;
            }
            case COLOR_TITLE: {
                chooseColor.lCustData = (LPARAM) string;
                break;
            }
        }
    }

    Tk_MakeWindowExist(parent);
    chooseColor.hwndOwner = NULL;
    hWnd = Tk_GetHWND(Tk_WindowId(parent));
    chooseColor.hwndOwner = hWnd;
    
    oldMode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
    winCode = ChooseColor(&chooseColor);
    (void) Tcl_SetServiceMode(oldMode);

    /*
     * Ensure that hWnd is enabled, because it can happen that we
     * have updated the wrapper of the parent, which causes us to
     * leave this child disabled (Windows loses sync).
     */
    EnableWindow(hWnd, 1);

    /*
     * Clear the interp result since anything may have happened during the
     * modal loop.
     */

    Tcl_ResetResult(interp);

    /*
     * 3. Process the result of the dialog
     */

    if (winCode) {
        /*
         * User has selected a color
         */
        char result[100];

        sprintf(result, "#%02x%02x%02x",
        GetRValue(chooseColor.rgbResult), 
                GetGValue(chooseColor.rgbResult), 
                GetBValue(chooseColor.rgbResult));
        Tcl_AppendResult(interp, result, NULL);
        oldColor = chooseColor.rgbResult;
    }
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ColorDlgHookProc --
 *
 *      Provides special handling of messages for the Color common dialog
 *      box.  Used to set the title when the dialog first appears.
 *
 * Results:
 *      The return value is 0 if the default dialog box procedure should
 *      handle the message, non-zero otherwise. 
 *
 * Side effects:
 *      Changes the title of the dialog window.
 *
 *----------------------------------------------------------------------
 */

static UINT CALLBACK 
ColorDlgHookProc(hDlg, uMsg, wParam, lParam)
    HWND hDlg;                  /* Handle to the color dialog. */
    UINT uMsg;                  /* Type of message. */
    WPARAM wParam;              /* First message parameter. */
    LPARAM lParam;              /* Second message parameter. */
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    switch (uMsg) {
        case WM_INITDIALOG: {
            const char *title;
            CHOOSECOLOR *ccPtr;
            Tcl_DString ds;

            /* 
             * Set the title string of the dialog.
             */

            ccPtr = (CHOOSECOLOR *) lParam;
            title = (const char *) ccPtr->lCustData;
            if ((title != NULL) && (title[0] != '\0')) {
                Tcl_UtfToExternalDString(NULL, title, -1, &ds);
                SetWindowText(hDlg, (TCHAR *) Tcl_DStringValue(&ds));
                Tcl_DStringFree(&ds);
            }
            if (tsdPtr->debugFlag) {
                tsdPtr->debugInterp = (Tcl_Interp *) ccPtr->lpTemplateName;
                Tcl_DoWhenIdle(SetTkDialog, (ClientData) hDlg);
            }
            return TRUE;
        }
    }
    return FALSE;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetOpenFileCmd --
 *
 *      This procedure implements the "open file" dialog box for the
 *      Windows platform. See the user documentation for details on what
 *      it does.
 *
 * Results:
 *      See user documentation.
 *
 * Side effects:
 *      A dialog window is created the first this procedure is called.
 *
 *----------------------------------------------------------------------
 */

int
Tk_GetOpenFileObjCmd(clientData, interp, objc, objv)
    ClientData clientData;      /* Main window associated with interpreter. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
{
    if (TkWinGetPlatformId() == VER_PLATFORM_WIN32_NT) {
        return GetFileNameW(clientData, interp, objc, objv, 1);
    } else {
        return GetFileNameA(clientData, interp, objc, objv, 1);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetSaveFileCmd --
 *
 *      Same as Tk_GetOpenFileCmd but opens a "save file" dialog box
 *      instead
 *
 * Results:
 *      Same as Tk_GetOpenFileCmd.
 *
 * Side effects:
 *      Same as Tk_GetOpenFileCmd.
 *
 *----------------------------------------------------------------------
 */

int
Tk_GetSaveFileObjCmd(clientData, interp, objc, objv)
    ClientData clientData;      /* Main window associated with interpreter. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
{
    if (TkWinGetPlatformId() == VER_PLATFORM_WIN32_NT) {
        return GetFileNameW(clientData, interp, objc, objv, 0);
    } else {
        return GetFileNameA(clientData, interp, objc, objv, 0);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * GetFileNameW --
 *
 *      Calls GetOpenFileName() or GetSaveFileName().
 *
 * Results:
 *      See user documentation.
 *
 * Side effects:
 *      See user documentation.
 *
 *----------------------------------------------------------------------
 */

static int 
GetFileNameW(clientData, interp, objc, objv, open)
    ClientData clientData;      /* Main window associated with interpreter. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
    int open;                   /* 1 to call GetOpenFileName(), 0 to 
                                 * call GetSaveFileName(). */
{
    Tcl_Encoding unicodeEncoding = Tcl_GetEncoding(NULL, "unicode");
    OPENFILENAMEW ofn;
    WCHAR file[MAX_PATH];
    int result, winCode, oldMode, i;
    char *extension, *filter, *title;
    Tk_Window tkwin;
    HWND hWnd;
    Tcl_DString utfFilterString, utfDirString;
    Tcl_DString extString, filterString, dirString, titleString;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    static char *optionStrings[] = {
        "-defaultextension", "-filetypes", "-initialdir", "-initialfile",
        "-parent",      "-title",       NULL
    };
    enum options {
        FILE_DEFAULT,   FILE_TYPES,     FILE_INITDIR,   FILE_INITFILE,
        FILE_PARENT,    FILE_TITLE
    };

    result = TCL_ERROR;
    file[0] = '\0';

    /*
     * Parse the arguments.
     */

    extension = NULL;
    filter = NULL;
    Tcl_DStringInit(&utfFilterString);
    Tcl_DStringInit(&utfDirString);
    tkwin = (Tk_Window) clientData;
    title = NULL;

    for (i = 1; i < objc; i += 2) {
        int index;
        char *string;
        Tcl_Obj *optionPtr, *valuePtr;

        optionPtr = objv[i];
        valuePtr = objv[i + 1];

        if (Tcl_GetIndexFromObj(interp, optionPtr, optionStrings, "option", 
                0, &index) != TCL_OK) {
            goto end;
        }
        if (i + 1 == objc) {
            string = Tcl_GetStringFromObj(optionPtr, NULL);
            Tcl_AppendResult(interp, "value for \"", string, "\" missing", 
                    (char *) NULL);
            goto end;
        }

        string = Tcl_GetStringFromObj(valuePtr, NULL);
        switch ((enum options) index) {
            case FILE_DEFAULT: {
                if (string[0] == '.') {
                    string++;
                }
                extension = string;
                break;
            }
            case FILE_TYPES: {
                Tcl_DStringFree(&utfFilterString);
                if (MakeFilter(interp, string, &utfFilterString) != TCL_OK) {
                    goto end;
                }
                filter = Tcl_DStringValue(&utfFilterString);
                break;
            }
            case FILE_INITDIR: {
                Tcl_DStringFree(&utfDirString);
                if (Tcl_TranslateFileName(interp, string, 
                        &utfDirString) == NULL) {
                    goto end;
                }
                break;
            }
            case FILE_INITFILE: {
                Tcl_DString ds;

                if (Tcl_TranslateFileName(interp, string, &ds) == NULL) {
                    goto end;
                }
                Tcl_UtfToExternal(NULL, unicodeEncoding, Tcl_DStringValue(&ds), 
                        Tcl_DStringLength(&ds), 0, NULL, (char *) file, 
                        sizeof(file), NULL, NULL, NULL);
                break;
            }
            case FILE_PARENT: {
                tkwin = Tk_NameToWindow(interp, string, tkwin);
                if (tkwin == NULL) {
                    goto end;
                }
                break;
            }
            case FILE_TITLE: {
                title = string;
                break;
            }
        }
    }

    if (filter == NULL) {
        if (MakeFilter(interp, "", &utfFilterString) != TCL_OK) {
            goto end;
        }
    }

    Tk_MakeWindowExist(tkwin);
    hWnd = Tk_GetHWND(Tk_WindowId(tkwin));

    ofn.lStructSize             = sizeof(ofn);
    ofn.hwndOwner               = hWnd;
    ofn.hInstance               = (HINSTANCE) GetWindowLong(ofn.hwndOwner, 
                                        GWL_HINSTANCE);
    ofn.lpstrFilter             = NULL;
    ofn.lpstrCustomFilter       = NULL;
    ofn.nMaxCustFilter          = 0;
    ofn.nFilterIndex            = 0;
    ofn.lpstrFile               = (WCHAR *) file;
    ofn.nMaxFile                = MAX_PATH;
    ofn.lpstrFileTitle          = NULL;
    ofn.nMaxFileTitle           = 0;
    ofn.lpstrInitialDir         = NULL;
    ofn.lpstrTitle              = NULL;
    ofn.Flags                   = OFN_HIDEREADONLY | OFN_PATHMUSTEXIST 
                                  | OFN_NOCHANGEDIR | OFN_EXPLORER;
    ofn.nFileOffset             = 0;
    ofn.nFileExtension          = 0;
    ofn.lpstrDefExt             = NULL;
    ofn.lpfnHook                = OFNHookProcW;
    ofn.lCustData               = (LPARAM) interp;
    ofn.lpTemplateName          = NULL;

    if (open != 0) {
        ofn.Flags |= OFN_FILEMUSTEXIST;
    } else {
        ofn.Flags |= OFN_OVERWRITEPROMPT;
    }

    if (tsdPtr->debugFlag != 0) {
        ofn.Flags |= OFN_ENABLEHOOK;
    }

    if (extension != NULL) {
        Tcl_UtfToExternalDString(unicodeEncoding, extension, -1, &extString);
        ofn.lpstrDefExt = (WCHAR *) Tcl_DStringValue(&extString);
    }

    Tcl_UtfToExternalDString(unicodeEncoding, Tcl_DStringValue(&utfFilterString),
            Tcl_DStringLength(&utfFilterString), &filterString);
    ofn.lpstrFilter = (WCHAR *) Tcl_DStringValue(&filterString);

    if (Tcl_DStringValue(&utfDirString)[0] != '\0') {
        Tcl_UtfToExternalDString(unicodeEncoding, Tcl_DStringValue(&utfDirString),
                Tcl_DStringLength(&utfDirString), &dirString);
        ofn.lpstrInitialDir = (WCHAR *) Tcl_DStringValue(&dirString);
    }

    if (title != NULL) {
        Tcl_UtfToExternalDString(unicodeEncoding, title, -1, &titleString);
        ofn.lpstrTitle = (WCHAR *) Tcl_DStringValue(&titleString);
    }

    /*
     * Popup the dialog.
     */

    oldMode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
    if (open != 0) {
        winCode = GetOpenFileNameW(&ofn);
    } else {
        winCode = GetSaveFileNameW(&ofn);
    }
    Tcl_SetServiceMode(oldMode);

    /*
     * Ensure that hWnd is enabled, because it can happen that we
     * have updated the wrapper of the parent, which causes us to
     * leave this child disabled (Windows loses sync).
     */
    EnableWindow(hWnd, 1);

    /*
     * Clear the interp result since anything may have happened during the
     * modal loop.
     */

    Tcl_ResetResult(interp);

    /*
     * Process the results.
     */

    if (winCode != 0) {
        char *p;
        Tcl_DString ds;

        Tcl_ExternalToUtfDString(unicodeEncoding, (char *) ofn.lpstrFile, -1, &ds);
        for (p = Tcl_DStringValue(&ds); *p != '\0'; p++) {
            /*
             * Change the pathname to the Tcl "normalized" pathname, where
             * back slashes are used instead of forward slashes
             */
            if (*p == '\\') {
                *p = '/';
            }
        }
        Tcl_AppendResult(interp, Tcl_DStringValue(&ds), NULL);
        Tcl_DStringFree(&ds);
    }

    if (ofn.lpstrTitle != NULL) {
        Tcl_DStringFree(&titleString);
    }
    if (ofn.lpstrInitialDir != NULL) {
        Tcl_DStringFree(&dirString);
    }
    Tcl_DStringFree(&filterString);
    if (ofn.lpstrDefExt != NULL) {
        Tcl_DStringFree(&extString);
    }
    result = TCL_OK;

    end:
    Tcl_DStringFree(&utfDirString);
    Tcl_DStringFree(&utfFilterString);

    return result;
}

/*
 *-------------------------------------------------------------------------
 *
 * OFNHookProcW --
 *
 *      Hook procedure called only if debugging is turned on.  Sets
 *      the "tk_dialog" variable when the dialog is ready to receive
 *      messages.
 *
 * Results:
 *      Returns 0 to allow default processing of messages to occur.
 *
 * Side effects:
 *      None.
 *
 *-------------------------------------------------------------------------
 */

static UINT APIENTRY 
OFNHookProcW(
    HWND hdlg,          // handle to child dialog window
    UINT uMsg,          // message identifier
    WPARAM wParam,      // message parameter
    LPARAM lParam)      // message parameter
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    OPENFILENAMEW *ofnPtr;

    if (uMsg == WM_INITDIALOG) {
        SetWindowLong(hdlg, GWL_USERDATA, lParam);
    } else if (uMsg == WM_WINDOWPOSCHANGED) {
        /*
         * This message is delivered at the right time to enable Tk
         * to set the debug information.  Unhooks itself so it 
         * won't set the debug information every time it gets a 
         * WM_WINDOWPOSCHANGED message.
         */

        ofnPtr = (OPENFILENAMEW *) GetWindowLong(hdlg, GWL_USERDATA);
        if (ofnPtr != NULL) {
            hdlg = GetParent(hdlg);
            tsdPtr->debugInterp = (Tcl_Interp *) ofnPtr->lCustData;
            Tcl_DoWhenIdle(SetTkDialog, (ClientData) hdlg);
            SetWindowLong(hdlg, GWL_USERDATA, (LPARAM) NULL);
        }
    }
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * GetFileNameA --
 *
 *      Calls GetOpenFileName() or GetSaveFileName().
 *
 * Results:
 *      See user documentation.
 *
 * Side effects:
 *      See user documentation.
 *
 *----------------------------------------------------------------------
 */

static int 
GetFileNameA(clientData, interp, objc, objv, open)
    ClientData clientData;      /* Main window associated with interpreter. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
    int open;                   /* 1 to call GetOpenFileName(), 0 to 
                                 * call GetSaveFileName(). */
{
    OPENFILENAME ofn;
    TCHAR file[MAX_PATH], savePath[MAX_PATH];
    int result, winCode, oldMode, i;
    char *extension, *filter, *title;
    Tk_Window tkwin;
    HWND hWnd;
    Tcl_DString utfFilterString, utfDirString;
    Tcl_DString extString, filterString, dirString, titleString;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    static char *optionStrings[] = {
        "-defaultextension", "-filetypes", "-initialdir", "-initialfile",
        "-parent",      "-title",       NULL
    };
    enum options {
        FILE_DEFAULT,   FILE_TYPES,     FILE_INITDIR,   FILE_INITFILE,
        FILE_PARENT,    FILE_TITLE
    };

    result = TCL_ERROR;
    file[0] = '\0';

    /*
     * Parse the arguments.
     */

    extension = NULL;
    filter = NULL;
    Tcl_DStringInit(&utfFilterString);
    Tcl_DStringInit(&utfDirString);
    tkwin = (Tk_Window) clientData;
    title = NULL;

    for (i = 1; i < objc; i += 2) {
        int index;
        char *string;
        Tcl_Obj *optionPtr, *valuePtr;

        optionPtr = objv[i];
        valuePtr = objv[i + 1];

        if (Tcl_GetIndexFromObj(interp, optionPtr, optionStrings, "option", 
                0, &index) != TCL_OK) {
            goto end;
        }
        if (i + 1 == objc) {
            string = Tcl_GetStringFromObj(optionPtr, NULL);
            Tcl_AppendResult(interp, "value for \"", string, "\" missing", 
                    (char *) NULL);
            goto end;
        }

        string = Tcl_GetStringFromObj(valuePtr, NULL);
        switch ((enum options) index) {
            case FILE_DEFAULT: {
                if (string[0] == '.') {
                    string++;
                }
                extension = string;
                break;
            }
            case FILE_TYPES: {
                Tcl_DStringFree(&utfFilterString);
                if (MakeFilter(interp, string, &utfFilterString) != TCL_OK) {
                    goto end;
                }
                filter = Tcl_DStringValue(&utfFilterString);
                break;
            }
            case FILE_INITDIR: {
                Tcl_DStringFree(&utfDirString);
                if (Tcl_TranslateFileName(interp, string, 
                        &utfDirString) == NULL) {
                    goto end;
                }
                break;
            }
            case FILE_INITFILE: {
                Tcl_DString ds;

                if (Tcl_TranslateFileName(interp, string, &ds) == NULL) {
                    goto end;
                }
                Tcl_UtfToExternal(NULL, NULL, Tcl_DStringValue(&ds), 
                        Tcl_DStringLength(&ds), 0, NULL, (char *) file, 
                        sizeof(file), NULL, NULL, NULL);
                break;
            }
            case FILE_PARENT: {
                tkwin = Tk_NameToWindow(interp, string, tkwin);
                if (tkwin == NULL) {
                    goto end;
                }
                break;
            }
            case FILE_TITLE: {
                title = string;
                break;
            }
        }
    }

    if (filter == NULL) {
        if (MakeFilter(interp, "", &utfFilterString) != TCL_OK) {
            goto end;
        }
    }

    Tk_MakeWindowExist(tkwin);
    hWnd = Tk_GetHWND(Tk_WindowId(tkwin));

    ofn.lStructSize             = sizeof(ofn);
    ofn.hwndOwner               = hWnd;
    ofn.hInstance               = (HINSTANCE) GetWindowLong(ofn.hwndOwner, 
                                        GWL_HINSTANCE);
    ofn.lpstrFilter             = NULL;
    ofn.lpstrCustomFilter       = NULL;
    ofn.nMaxCustFilter          = 0;
    ofn.nFilterIndex            = 0;
    ofn.lpstrFile               = (LPTSTR) file;
    ofn.nMaxFile                = MAX_PATH;
    ofn.lpstrFileTitle          = NULL;
    ofn.nMaxFileTitle           = 0;
    ofn.lpstrInitialDir         = NULL;
    ofn.lpstrTitle              = NULL;
    ofn.Flags                   = OFN_HIDEREADONLY | OFN_PATHMUSTEXIST 
                                  | OFN_NOCHANGEDIR | OFN_EXPLORER;
    ofn.nFileOffset             = 0;
    ofn.nFileExtension          = 0;
    ofn.lpstrDefExt             = NULL;
    ofn.lpfnHook                = OFNHookProc;
    ofn.lCustData               = (LPARAM) interp;
    ofn.lpTemplateName          = NULL;

    if (open != 0) {
        ofn.Flags |= OFN_FILEMUSTEXIST;
    } else {
        ofn.Flags |= OFN_OVERWRITEPROMPT;
    }

    if (tsdPtr->debugFlag != 0) {
        ofn.Flags |= OFN_ENABLEHOOK;
    }

    if (extension != NULL) {
        Tcl_UtfToExternalDString(NULL, extension, -1, &extString);
        ofn.lpstrDefExt = (LPTSTR) Tcl_DStringValue(&extString);
    }
    Tcl_UtfToExternalDString(NULL, Tcl_DStringValue(&utfFilterString),
            Tcl_DStringLength(&utfFilterString), &filterString);
    ofn.lpstrFilter = (LPTSTR) Tcl_DStringValue(&filterString);

    if (Tcl_DStringValue(&utfDirString)[0] != '\0') {
        Tcl_UtfToExternalDString(NULL, Tcl_DStringValue(&utfDirString),
                Tcl_DStringLength(&utfDirString), &dirString);
        ofn.lpstrInitialDir = (LPTSTR) Tcl_DStringValue(&dirString);
    }
    if (title != NULL) {
        Tcl_UtfToExternalDString(NULL, title, -1, &titleString);
        ofn.lpstrTitle = (LPTSTR) Tcl_DStringValue(&titleString);
    }

    /*
     * Popup the dialog.  
     */

    GetCurrentDirectory(MAX_PATH, savePath);
    oldMode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
    if (open != 0) {
        winCode = GetOpenFileName(&ofn);
    } else {
        winCode = GetSaveFileName(&ofn);
    }
    Tcl_SetServiceMode(oldMode);
    SetCurrentDirectory(savePath);

    /*
     * Ensure that hWnd is enabled, because it can happen that we
     * have updated the wrapper of the parent, which causes us to
     * leave this child disabled (Windows loses sync).
     */
    EnableWindow(hWnd, 1);

    /*
     * Clear the interp result since anything may have happened during the
     * modal loop.
     */

    Tcl_ResetResult(interp);

    /*
     * Process the results.
     */

    if (winCode != 0) {
        char *p;
        Tcl_DString ds;

        Tcl_ExternalToUtfDString(NULL, (char *) ofn.lpstrFile, -1, &ds);
        for (p = Tcl_DStringValue(&ds); *p != '\0'; p++) {
            /*
             * Change the pathname to the Tcl "normalized" pathname, where
             * back slashes are used instead of forward slashes
             */
            if (*p == '\\') {
                *p = '/';
            }
        }
        Tcl_AppendResult(interp, Tcl_DStringValue(&ds), NULL);
        Tcl_DStringFree(&ds);
    }

    if (ofn.lpstrTitle != NULL) {
        Tcl_DStringFree(&titleString);
    }
    if (ofn.lpstrInitialDir != NULL) {
        Tcl_DStringFree(&dirString);
    }
    Tcl_DStringFree(&filterString);
    if (ofn.lpstrDefExt != NULL) {
        Tcl_DStringFree(&extString);
    }
    result = TCL_OK;

    end:
    Tcl_DStringFree(&utfDirString);
    Tcl_DStringFree(&utfFilterString);

    return result;
}

/*
 *-------------------------------------------------------------------------
 *
 * OFNHookProc --
 *
 *      Hook procedure called only if debugging is turned on.  Sets
 *      the "tk_dialog" variable when the dialog is ready to receive
 *      messages.
 *
 * Results:
 *      Returns 0 to allow default processing of messages to occur.
 *
 * Side effects:
 *      None.
 *
 *-------------------------------------------------------------------------
 */

static UINT APIENTRY 
OFNHookProc(
    HWND hdlg,          // handle to child dialog window
    UINT uMsg,          // message identifier
    WPARAM wParam,      // message parameter
    LPARAM lParam)      // message parameter
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    OPENFILENAME *ofnPtr;

    if (uMsg == WM_INITDIALOG) {
        SetWindowLong(hdlg, GWL_USERDATA, lParam);
    } else if (uMsg == WM_WINDOWPOSCHANGED) {
        /*
         * This message is delivered at the right time to both 
         * old-style and explorer-style hook procs to enable Tk
         * to set the debug information.  Unhooks itself so it 
         * won't set the debug information every time it gets a 
         * WM_WINDOWPOSCHANGED message.
         */

        ofnPtr = (OPENFILENAME *) GetWindowLong(hdlg, GWL_USERDATA);
        if (ofnPtr != NULL) {
            if (ofnPtr->Flags & OFN_EXPLORER) {
                hdlg = GetParent(hdlg);
            }
            tsdPtr->debugInterp = (Tcl_Interp *) ofnPtr->lCustData;
            Tcl_DoWhenIdle(SetTkDialog, (ClientData) hdlg);
            SetWindowLong(hdlg, GWL_USERDATA, (LPARAM) NULL);
        }
    }
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * MakeFilter --
 *
 *      Allocate a buffer to store the filters in a format understood by
 *      Windows
 *
 * Results:
 *      A standard TCL return value.
 *
 * Side effects:
 *      ofnPtr->lpstrFilter is modified.
 *
 *----------------------------------------------------------------------
 */
static int 
MakeFilter(interp, string, dsPtr) 
    Tcl_Interp *interp;         /* Current interpreter. */
    char *string;               /* String value of the -filetypes option */
    Tcl_DString *dsPtr;         /* Filled with windows filter string. */
{
    char *filterStr;
    char *p;
    int pass;
    FileFilterList flist;
    FileFilter *filterPtr;

    TkInitFileFilters(&flist);
    if (TkGetFileFilters(interp, &flist, string, 1) != TCL_OK) {
        return TCL_ERROR;
    }

    if (flist.filters == NULL) {
        /*
         * Use "All Files (*.*) as the default filter if none is specified
         */
        char *defaultFilter = "All Files (*.*)";

        p = filterStr = (char*)ckalloc(30 * sizeof(char));

        strcpy(p, defaultFilter);
        p+= strlen(defaultFilter);

        *p++ = '\0';
        *p++ = '*';
        *p++ = '.';
        *p++ = '*';
        *p++ = '\0';
        *p++ = '\0';
        *p = '\0';

    } else {
        /* We format the filetype into a string understood by Windows:
         * {"Text Documents" {.doc .txt} {TEXT}} becomes
         * "Text Documents (*.doc,*.txt)\0*.doc;*.txt\0"
         *
         * See the Windows OPENFILENAME manual page for details on the filter
         * string format.
         */

        /*
         * Since we may only add asterisks (*) to the filter, we need at most
         * twice the size of the string to format the filter
         */
        filterStr = ckalloc(strlen(string) * 3);

        for (filterPtr = flist.filters, p = filterStr; filterPtr;
                filterPtr = filterPtr->next) {
            char *sep;
            FileFilterClause *clausePtr;

            /*
             *  First, put in the name of the file type
             */
            strcpy(p, filterPtr->name);
            p+= strlen(filterPtr->name);
            *p++ = ' ';
            *p++ = '(';

            for (pass = 1; pass <= 2; pass++) {
                /*
                 * In the first pass, we format the extensions in the 
                 * name field. In the second pass, we format the extensions in
                 * the filter pattern field
                 */
                sep = "";
                for (clausePtr=filterPtr->clauses;clausePtr;
                         clausePtr=clausePtr->next) {
                    GlobPattern *globPtr;
                

                    for (globPtr=clausePtr->patterns; globPtr;
                            globPtr=globPtr->next) {
                        strcpy(p, sep);
                        p+= strlen(sep);
                        strcpy(p, globPtr->pattern);
                        p+= strlen(globPtr->pattern);

                        if (pass==1) {
                            sep = ",";
                        } else {
                            sep = ";";
                        }
                    }
                }
                if (pass == 1) {
                    if (pass == 1) {
                        *p ++ = ')';
                    }
                }
                *p ++ = '\0';
            }
        }

        /*
         * Windows requires the filter string to be ended by two NULL
         * characters.
         */
        *p++ = '\0';
        *p = '\0';
    }

    Tcl_DStringAppend(dsPtr, filterStr, p - filterStr);
    ckfree((char *) filterStr);

    TkFreeFileFilters(&flist);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_ChooseDirectoryObjCmd --
 *
 *      This procedure implements the "tk_chooseDirectory" dialog box 
 *      for the Windows platform. See the user documentation for details 
 *      on what it does.
 *
 * Results:
 *      See user documentation.
 *
 * Side effects:
 *      A modal dialog window is created.  Tcl_SetServiceMode() is
 *      called to allow background events to be processed
 *
 *----------------------------------------------------------------------
 */

int
Tk_ChooseDirectoryObjCmd(clientData, interp, objc, objv)
    ClientData clientData;      /* Main window associated with interpreter. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
{
    OPENFILENAME ofn;
    TCHAR path[MAX_PATH], savePath[MAX_PATH];
    ChooseDir cd;
    int result, mustExist, code, mode, i;
    Tk_Window tkwin;
    HWND hWnd;
    char *utfTitle;
    Tcl_DString utfDirString;
    Tcl_DString titleString, dirString;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    static char *optionStrings[] = {
        "-initialdir",  "-mustexist",   "-parent",      "-title",
        NULL
    };
    enum options {
        DIR_INITIAL,    DIR_EXIST,      DIR_PARENT,     FILE_TITLE
    };

    if (tsdPtr->WM_LBSELCHANGED == 0) {
        tsdPtr->WM_LBSELCHANGED = RegisterWindowMessage(LBSELCHSTRING);
    }
   
    result = TCL_ERROR;
    path[0] = '\0';

    Tcl_DStringInit(&utfDirString);
    mustExist = 0;
    tkwin = (Tk_Window) clientData;
    utfTitle = NULL;

    for (i = 1; i < objc; i += 2) {
        int index;
        char *string;
        Tcl_Obj *optionPtr, *valuePtr;

        optionPtr = objv[i];
        valuePtr = objv[i + 1];

        if (Tcl_GetIndexFromObj(interp, optionPtr, optionStrings, "option",
                0, &index) != TCL_OK) {
            goto cleanup;
        }
        if (i + 1 == objc) {
            string = Tcl_GetStringFromObj(optionPtr, NULL);
            Tcl_AppendResult(interp, "value for \"", string, "\" missing", 
                    (char *) NULL);
            goto cleanup;
        }

        string = Tcl_GetStringFromObj(valuePtr, NULL);
        switch ((enum options) index) {
            case DIR_INITIAL: {
                Tcl_DStringFree(&utfDirString);
                if (Tcl_TranslateFileName(interp, string, 
                        &utfDirString) == NULL) {
                    goto cleanup;
                }
                break;
            }
            case DIR_EXIST: {
                if (Tcl_GetBooleanFromObj(interp, valuePtr, &mustExist) != TCL_OK) {
                    goto cleanup;
                }
                break;
            }
            case DIR_PARENT: {
                tkwin = Tk_NameToWindow(interp, string, tkwin);
                if (tkwin == NULL) {
                    goto cleanup;
                }
                break;
            }
            case FILE_TITLE: {
                utfTitle = string;
                break;
            }
        }
    }

    Tk_MakeWindowExist(tkwin);
    hWnd = Tk_GetHWND(Tk_WindowId(tkwin));

    cd.interp = interp;

    ofn.lStructSize             = sizeof(ofn);
    ofn.hwndOwner               = hWnd;
    ofn.hInstance               = (HINSTANCE) GetWindowLong(ofn.hwndOwner, 
                                        GWL_HINSTANCE);
    ofn.lpstrFilter             = NULL;
    ofn.lpstrCustomFilter       = NULL;
    ofn.nMaxCustFilter          = 0;
    ofn.nFilterIndex            = 0;
    ofn.lpstrFile               = NULL; //(TCHAR *) path;
    ofn.nMaxFile                = MAX_PATH;
    ofn.lpstrFileTitle          = NULL;
    ofn.nMaxFileTitle           = 0;
    ofn.lpstrInitialDir         = NULL;
    ofn.lpstrTitle              = NULL;
    ofn.Flags                   = OFN_HIDEREADONLY
                                  | OFN_ENABLEHOOK | OFN_ENABLETEMPLATE;
    ofn.nFileOffset             = 0;
    ofn.nFileExtension          = 0;
    ofn.lpstrDefExt             = NULL;
    ofn.lCustData               = (LPARAM) &cd;
    ofn.lpfnHook                = ChooseDirectoryHookProc;
    ofn.lpTemplateName          = MAKEINTRESOURCE(FILEOPENORD);

    if (Tcl_DStringValue(&utfDirString)[0] != '\0') {
        Tcl_UtfToExternalDString(NULL, Tcl_DStringValue(&utfDirString), 
                Tcl_DStringLength(&utfDirString), &dirString);
        ofn.lpstrInitialDir = (LPTSTR) Tcl_DStringValue(&dirString);
    }
    if (mustExist) {
        ofn.Flags |= OFN_PATHMUSTEXIST;
    }
    if (utfTitle != NULL) {
        Tcl_UtfToExternalDString(NULL, utfTitle, -1, &titleString);
        ofn.lpstrTitle = (LPTSTR) Tcl_DStringValue(&titleString);
    }

    /*
     * Display dialog.  The choose directory dialog doesn't preserve the
     * current directory, so it must be saved and restored here.
     */
    
    GetCurrentDirectory(MAX_PATH, savePath);
    mode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
    code = GetOpenFileName(&ofn);
    Tcl_SetServiceMode(mode);
    SetCurrentDirectory(savePath);

    /*
     * Ensure that hWnd is enabled, because it can happen that we
     * have updated the wrapper of the parent, which causes us to
     * leave this child disabled (Windows loses sync).
     */
    EnableWindow(hWnd, 1);

    Tcl_ResetResult(interp);
    if (code != 0) {
        /*
         * Change the pathname to the Tcl "normalized" pathname, where
         * back slashes are used instead of forward slashes
         */

        char *p;
        Tcl_DString ds;

        Tcl_ExternalToUtfDString(NULL, (char *) cd.path, -1, &ds);
        for (p = Tcl_DStringValue(&ds); *p != '\0'; p++) {
            if (*p == '\\') {
                *p = '/';
            }
        }
        Tcl_AppendResult(interp, Tcl_DStringValue(&ds), NULL);
        Tcl_DStringFree(&ds);
    }

    if (ofn.lpstrTitle != NULL) {
        Tcl_DStringFree(&titleString);
    }
    if (ofn.lpstrInitialDir != NULL) {
        Tcl_DStringFree(&dirString);
    }
    result = TCL_OK;

    cleanup:
    Tcl_DStringFree(&utfDirString);

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * ChooseDirectoryHookProc --
 *
 *      Hook procedure called by the ChooseDirectory dialog to modify
 *      its default behavior.  The ChooseDirectory dialog is really an
 *      OpenFile dialog with certain controls rearranged and certain
 *      behaviors changed.  For instance, typing a name in the 
 *      ChooseDirectory dialog selects a directory, rather than 
 *      selecting a file.
 *
 * Results:
 *      Returns 0 to allow default processing of message, or 1 to 
 *      tell default dialog procedure not to process the message.
 *
 * Side effects:
 *      A dialog window is created the first this procedure is called.
 *      This window is not destroyed and will be reused the next time
 *      the application invokes the "tk_getOpenFile" or
 *      "tk_getSaveFile" command.
 *
 *----------------------------------------------------------------------
 */

static UINT APIENTRY 
ChooseDirectoryHookProc(
    HWND hwnd,
    UINT message,
    WPARAM wParam,
    LPARAM lParam)
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    OPENFILENAME *ofnPtr;

    /*
     * GWL_USERDATA keeps track of ofnPtr.
     */
    
    ofnPtr = (OPENFILENAME *) GetWindowLong(hwnd, GWL_USERDATA);

    if (message == WM_INITDIALOG) {
        ChooseDir *cdPtr;

        SetWindowLong(hwnd, GWL_USERDATA, lParam);
        ofnPtr = (OPENFILENAME *) lParam;
        cdPtr = (ChooseDir *) ofnPtr->lCustData;
        cdPtr->lastCtrl = 0;
        cdPtr->lastIdx = 1000;
        cdPtr->path[0] = '\0';

        if (ofnPtr->lpstrInitialDir == NULL) {
            GetCurrentDirectory(MAX_PATH, cdPtr->path);
        } else {
            lstrcpy(cdPtr->path, ofnPtr->lpstrInitialDir);
        }
        SetDlgItemText(hwnd, edt10, cdPtr->path);
        SendDlgItemMessage(hwnd, edt10, EM_SETSEL, 0, -1);
        if (tsdPtr->debugFlag) {
            tsdPtr->debugInterp = cdPtr->interp;
            Tcl_DoWhenIdle(SetTkDialog, (ClientData) hwnd);
        }
        return 0;
    }
    if (ofnPtr == NULL) {
        return 0;
    }

    if (message == tsdPtr->WM_LBSELCHANGED) {
        /*
         * Called when double-clicking on directory.
         * If directory wasn't already open, browse that directory.
         * If directory was already open, return selected directory.
         */

        ChooseDir *cdPtr;
        int idCtrl, thisItem;

        idCtrl = (int) wParam;
        thisItem = LOWORD(lParam);
        cdPtr = (ChooseDir *) ofnPtr->lCustData;

        GetCurrentDirectory(MAX_PATH, cdPtr->path);
        if (idCtrl == lst2) {
            if (cdPtr->lastIdx == thisItem) {
                EndDialog(hwnd, IDOK);
                return 1;
            }
            cdPtr->lastIdx = thisItem;
        }
        SetDlgItemText(hwnd, edt10, cdPtr->path);
        SendDlgItemMessage(hwnd, edt10, EM_SETSEL, 0, -1);
    } else if (message == WM_COMMAND) {
        ChooseDir *cdPtr;
        int idCtrl, notifyCode;

        idCtrl = LOWORD(wParam);
        notifyCode = HIWORD(wParam);
        cdPtr = (ChooseDir *) ofnPtr->lCustData;

        if ((idCtrl != IDOK) || (notifyCode != BN_CLICKED)) {
            /*
             * OK Button wasn't clicked.  Do the default.
             */

            if ((idCtrl == lst2) || (idCtrl == edt10)) {
                cdPtr->lastCtrl = idCtrl;
            }
            return 0;
        }

        /*
         * Dialogs also get the message that OK was clicked when Enter 
         * is pressed in some other control.  Find out what window
         * we were really in when we got the supposed "OK", because the 
         * behavior is different.
         */

        if (cdPtr->lastCtrl == edt10) {
            /*
             * Hit Enter or clicked OK while typing a directory name in the 
             * edit control.
             * If it's a new name, try to go to that directory.
             * If the name hasn't changed since last time, return selected 
             * directory.
             */

            int changed;
            TCHAR tmp[MAX_PATH];

            if (GetDlgItemText(hwnd, edt10, tmp, MAX_PATH) == 0) {
                return 0;
            }

            changed = lstrcmp(cdPtr->path, tmp);
            lstrcpy(cdPtr->path, tmp);

            if (SetCurrentDirectory(cdPtr->path) == 0) {
                /*
                 * Non-existent directory.
                 */

                if (ofnPtr->Flags & OFN_PATHMUSTEXIST) {
                    /*
                     * Directory must exist.  Complain, then rehighlight text.
                     */

                    wsprintf(tmp, _T("Cannot change directory to \"%.200s\"."), 
                            cdPtr->path);
                    MessageBox(hwnd, tmp, NULL, MB_OK);
                    SendDlgItemMessage(hwnd, edt10, EM_SETSEL, 0, -1);
                    return 0;
                } 
                if (changed) {
                    /*
                     * Directory was invalid, but we want to keep displaying
                     * this name.  Don't update the listbox that displays the 
                     * current directory heirarchy, or it'll erase the name.
                     */
                    
                    SendDlgItemMessage(hwnd, edt10, EM_SETSEL, 0, -1);
                    return 0;
                }
            }
            if (changed == 0) {
                /*
                 * Name hasn't changed since the last time we hit return
                 * or double-clicked on a directory, so return this.
                 */

                EndDialog(hwnd, IDOK);
                return 1;
            }
            
            cdPtr->lastCtrl = IDOK;

            /*
             * The following is the magic code, determined by running 
             * Spy++ on some other directory chooser, that it takes to 
             * get this dialog to update the listbox to display the 
             * current directory.
             */

            SetDlgItemText(hwnd, edt1, cdPtr->path);
            SendMessage(hwnd, WM_COMMAND, (WPARAM) MAKELONG(cmb2, 0x8003), 
                    (LPARAM) GetDlgItem(hwnd, cmb2));
            return 0;
        } else if (idCtrl == lst2) {
            /*
             * Enter key was pressed while in listbox.  
             * If it's a new directory, allow default behavior to open dir.
             * If the directory hasn't changed, return selected directory.
             */

            int thisItem;

            thisItem = (int) SendDlgItemMessage(hwnd, lst2, LB_GETCURSEL, 0, 0);
            if (cdPtr->lastIdx == thisItem) {
                GetCurrentDirectory(MAX_PATH, cdPtr->path);
                EndDialog(hwnd, IDOK);
                return 1;
            }
        } else if (idCtrl == IDOK) {
            /* 
             * The OK button was clicked. Return the value currently selected
             * in the entry.
             */

            GetCurrentDirectory(MAX_PATH, cdPtr->path);
            EndDialog(hwnd, IDOK);
            return 1;
        }
    }
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_MessageBoxObjCmd --
 *
 *      This procedure implements the MessageBox window for the
 *      Windows platform. See the user documentation for details on what
 *      it does.
 *
 * Results:
 *      See user documentation.
 *
 * Side effects:
 *      None. The MessageBox window will be destroy before this procedure
 *      returns.
 *
 *----------------------------------------------------------------------
 */

int
Tk_MessageBoxObjCmd(clientData, interp, objc, objv)
    ClientData clientData;      /* Main window associated with interpreter. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
{
    Tk_Window tkwin, parent;
    HWND hWnd;
    char *message, *title;
    int defaultBtn, icon, type;
    int i, oldMode, flags, winCode;
    Tcl_DString messageString, titleString;
    static char *optionStrings[] = {
        "-default",     "-icon",        "-message",     "-parent",
        "-title",       "-type",        NULL
    };
    enum options {
        MSG_DEFAULT,    MSG_ICON,       MSG_MESSAGE,    MSG_PARENT,
        MSG_TITLE,      MSG_TYPE
    };

    tkwin = (Tk_Window) clientData;

    defaultBtn  = -1;
    icon        = MB_ICONINFORMATION;
    message     = NULL;
    parent      = tkwin;
    title       = NULL;
    type        = MB_OK;

    for (i = 1; i < objc; i += 2) {
        int index;
        char *string;
        Tcl_Obj *optionPtr, *valuePtr;

        optionPtr = objv[i];
        valuePtr = objv[i + 1];

        if (Tcl_GetIndexFromObj(interp, optionPtr, optionStrings, "option",
                TCL_EXACT, &index) != TCL_OK) {
            return TCL_ERROR;
        }
        if (i + 1 == objc) {
            string = Tcl_GetStringFromObj(optionPtr, NULL);
            Tcl_AppendResult(interp, "value for \"", string, "\" missing", 
                    (char *) NULL);
            return TCL_ERROR;
        }

        string = Tcl_GetStringFromObj(valuePtr, NULL);
        switch ((enum options) index) {
        case MSG_DEFAULT:
            defaultBtn = TkFindStateNumObj(interp, optionPtr, buttonMap, 
                    valuePtr);
            if (defaultBtn < 0) {
                return TCL_ERROR;
            }
            break;

        case MSG_ICON:
            icon = TkFindStateNumObj(interp, optionPtr, iconMap, valuePtr);
            if (icon < 0) {
                return TCL_ERROR;
            }
            break;

        case MSG_MESSAGE:
            message = string;
            break;

        case MSG_PARENT: 
            parent = Tk_NameToWindow(interp, string, tkwin);
            if (parent == NULL) {
                return TCL_ERROR;
            }
            break;

        case MSG_TITLE:
            title = string;
            break;

        case MSG_TYPE:
            type = TkFindStateNumObj(interp, optionPtr, typeMap, valuePtr);
            if (type < 0) {
                return TCL_ERROR;
            }
            break;

        }
    }

    Tk_MakeWindowExist(parent);
    hWnd = Tk_GetHWND(Tk_WindowId(parent));
    
    flags = 0;
    if (defaultBtn >= 0) {
        int defaultBtnIdx;

        defaultBtnIdx = -1;
        for (i = 0; i < NUM_TYPES; i++) {
            if (type == allowedTypes[i].type) {
                int j;

                for (j = 0; j < 3; j++) {
                    if (allowedTypes[i].btnIds[j] == defaultBtn) {
                        defaultBtnIdx = j;
                        break;
                    }
                }
                if (defaultBtnIdx < 0) {
                    Tcl_AppendResult(interp, "invalid default button \"",
                            TkFindStateString(buttonMap, defaultBtn), 
                            "\"", NULL);
                    return TCL_ERROR;
                }
                break;
            }
        }
        flags = buttonFlagMap[defaultBtnIdx];
    }

    flags |= icon | type | MB_SYSTEMMODAL;

    Tcl_UtfToExternalDString(NULL, message, -1, &messageString);
    Tcl_UtfToExternalDString(NULL, title, -1, &titleString);

    oldMode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
    winCode = MessageBox(hWnd, Tcl_DStringValue(&messageString),
                Tcl_DStringValue(&titleString), flags);
    (void) Tcl_SetServiceMode(oldMode);

    /*
     * Ensure that hWnd is enabled, because it can happen that we
     * have updated the wrapper of the parent, which causes us to
     * leave this child disabled (Windows loses sync).
     */
    EnableWindow(hWnd, 1);

    Tcl_DStringFree(&messageString);
    Tcl_DStringFree(&titleString);

    Tcl_SetResult(interp, TkFindStateString(buttonMap, winCode), TCL_STATIC);
    return TCL_OK;
}

static void 
SetTkDialog(ClientData clientData)
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    char buf[32];
    HWND hwnd;

    hwnd = (HWND) clientData;

    sprintf(buf, "0x%08x", hwnd);
    Tcl_SetVar(tsdPtr->debugInterp, "tk_dialog", buf, TCL_GLOBAL_ONLY);
}

/* End of tkwindialog.c */