src/x11/utils.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        utils.cpp
// Purpose:     Various utilities
// Author:      Julian Smart
// Modified by:
// Created:     17/09/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#include "wx/setup.h"
#include "wx/utils.h"
#include "wx/app.h"
#include "wx/msgdlg.h"
#include "wx/cursor.h"
#include "wx/window.h" // for wxTopLevelWindows

#include <ctype.h>
#include <stdarg.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
#include <pwd.h>
#include <errno.h>
#include <netdb.h>
#include <signal.h>

#if (defined(__SUNCC__) || defined(__CLCC__))
    #include <sysent.h>
#endif

#ifdef __VMS__
#pragma message disable nosimpint
#endif

#ifdef __VMS__
#pragma message enable nosimpint
#endif

#include "wx/unix/execute.h"

#include "wx/x11/private.h"
#include "X11/Xresource.h"
#include "X11/Xutil.h"

// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------

// Yuck this is really BOTH site and platform dependent
// so we should use some other strategy!
#ifdef sun
    #define DEFAULT_XRESOURCE_DIR "/usr/openwin/lib/app-defaults"
#else
    #define DEFAULT_XRESOURCE_DIR "/usr/lib/X11/app-defaults"
#endif

static char *GetIniFile (char *dest, const char *filename);

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// async event processing
// ----------------------------------------------------------------------------

// Consume all events until no more left
void wxFlushEvents()
{
    Display *display = (Display*) wxGetDisplay();

    XSync (display, FALSE);
    XFlush(display);

    // TODO
#if 0

    // XtAppPending returns availability of events AND timers/inputs, which
    // are processed via callbacks, so XtAppNextEvent will not return if
    // there are no events. So added '& XtIMXEvent' - Sergey.
    while (XtAppPending ((XtAppContext) wxTheApp->GetAppContext()) & XtIMXEvent)
    {
        XFlush (XtDisplay ((Widget) wxTheApp->GetTopLevelWidget()));
        // Jan Lessner: works better when events are non-X events
        XtAppProcessEvent((XtAppContext) wxTheApp->GetAppContext(), XtIMXEvent);
    }
#endif
}

// Check whether this window wants to process messages, e.g. Stop button
// in long calculations.
bool wxCheckForInterrupt(wxWindow *wnd)
{
    wxASSERT_MSG(FALSE, "wxCheckForInterrupt not yet implemented.");
    return FALSE;
#if 0
    wxCHECK_MSG( wnd, FALSE, "NULL window in wxCheckForInterrupt" );

    Display *dpy=(Display*) wnd->GetXDisplay();
    Window win=(Window) wnd->GetXWindow();
    XEvent event;
    XFlush(dpy);
    if (wnd->GetMainWidget())
    {
        XmUpdateDisplay((Widget)(wnd->GetMainWidget()));
    }

    bool hadEvents = FALSE;
    while( XCheckMaskEvent(dpy,
                           ButtonPressMask|ButtonReleaseMask|ButtonMotionMask|
                           PointerMotionMask|KeyPressMask|KeyReleaseMask,
                           &event) )
    {
        if ( event.xany.window == win )
        {
            hadEvents = TRUE;

            XtDispatchEvent(&event);
        }
    }

    return hadEvents;
#endif
}

// ----------------------------------------------------------------------------
// wxExecute stuff
// ----------------------------------------------------------------------------
#if 0
static void xt_notify_end_process(XtPointer data, int *WXUNUSED(fid),
                                  XtInputId *id)
{
    wxEndProcessData *proc_data = (wxEndProcessData *)data;

    wxHandleProcessTermination(proc_data);

    // VZ: I think they should be the same...
    wxASSERT( (int)*id == proc_data->tag );

    XtRemoveInput(*id);
}

int wxAddProcessCallback(wxEndProcessData *proc_data, int fd)
{
    XtInputId id = XtAppAddInput((XtAppContext) wxTheApp->GetAppContext(),
                                 fd,
                                 (XtPointer *) XtInputReadMask,
                                 (XtInputCallbackProc) xt_notify_end_process,
                                 (XtPointer) proc_data);

    return (int)id;
}
#endif

// ----------------------------------------------------------------------------
// misc
// ----------------------------------------------------------------------------

// Emit a beeeeeep
void wxBell()
{
    // Use current setting for the bell
    XBell ((Display*) wxGetDisplay(), 0);
}

int wxGetOsVersion(int *majorVsn, int *minorVsn)
{
#if 0
    // FIXME TODO
    // This code is WRONG!! Does NOT return the
    // Motif version of the libs but the X protocol
    // version!
    Display *display = XtDisplay ((Widget) wxTheApp->GetTopLevelWidget());
    if (majorVsn)
        *majorVsn = ProtocolVersion (display);
    if (minorVsn)
        *minorVsn = ProtocolRevision (display);

    return wxMOTIF_X;
#else
    if (majorVsn)
        *majorVsn = 0;
    if (minorVsn)
        *minorVsn = 0;
    return wxX11;
#endif
}

// ----------------------------------------------------------------------------
// Reading and writing resources (eg WIN.INI, .Xdefaults)
// ----------------------------------------------------------------------------

// Read $HOME for what it says is home, if not
// read $USER or $LOGNAME for user name else determine
// the Real User, then determine the Real home dir.
static char * GetIniFile (char *dest, const char *filename)
{
    char *home = NULL;
    if (filename && wxIsAbsolutePath(filename))
    {
        strcpy(dest, filename);
    }
    else if ((home = wxGetUserHome("")) != NULL)
    {
        strcpy(dest, home);
        if (dest[strlen(dest) - 1] != '/')
            strcat (dest, "/");
        if (filename == NULL)
        {
            if ((filename = getenv ("XENVIRONMENT")) == NULL)
                filename = ".Xdefaults";
        }
        else if (*filename != '.')
            strcat (dest, ".");
        strcat (dest, filename);
    } else
    {
        dest[0] = '\0';
    }
    return dest;
}

#if wxUSE_RESOURCES

static char *GetResourcePath(char *buf, const char *name, bool create = FALSE)
{
    if (create && wxFileExists (name) ) {
        strcpy(buf, name);
        return buf; // Exists so ...
    }

    if (*name == '/')
        strcpy(buf, name);
    else {
        // Put in standard place for resource files if not absolute
        strcpy (buf, DEFAULT_XRESOURCE_DIR);
        strcat (buf, "/");
        strcat (buf, (const char*) wxFileNameFromPath (name));
    }

    if (create) {
        // Touch the file to create it
        FILE *fd = fopen (buf, "w");
        if (fd) fclose (fd);
    }
    return buf;
}

/*
* We have a cache for writing different resource files,
* which will only get flushed when we call wxFlushResources().
* Build up a list of resource databases waiting to be written.
*
*/

wxList wxResourceCache (wxKEY_STRING);

void
wxFlushResources (void)
{
    char nameBuffer[512];

    wxNode *node = wxResourceCache.First ();
    while (node)
    {
        const char *file = node->GetKeyString();
        // If file doesn't exist, create it first.
        (void)GetResourcePath(nameBuffer, file, TRUE);

        XrmDatabase database = (XrmDatabase) node->Data ();
        XrmPutFileDatabase (database, nameBuffer);
        XrmDestroyDatabase (database);
        wxNode *next = node->Next ();
        delete node;
        node = next;
    }
}

static XrmDatabase wxResourceDatabase = 0;

void wxXMergeDatabases (wxApp * theApp, Display * display);

bool wxWriteResource(const wxString& section, const wxString& entry, const wxString& value, const wxString& file)
{
    char buffer[500];

    (void) GetIniFile (buffer, file);

    XrmDatabase database;
    wxNode *node = wxResourceCache.Find (buffer);
    if (node)
        database = (XrmDatabase) node->Data ();
    else
    {
        database = XrmGetFileDatabase (buffer);
        wxResourceCache.Append (buffer, (wxObject *) database);
    }

    char resName[300];
    strcpy (resName, (const char*) section);
    strcat (resName, ".");
    strcat (resName, (const char*) entry);

    XrmPutStringResource (&database, resName, value);
    return TRUE;
}

bool wxWriteResource(const wxString& section, const wxString& entry, float value, const wxString& file)
{
    char buf[50];
    sprintf(buf, "%.4f", value);
    return wxWriteResource(section, entry, buf, file);
}

bool wxWriteResource(const wxString& section, const wxString& entry, long value, const wxString& file)
{
    char buf[50];
    sprintf(buf, "%ld", value);
    return wxWriteResource(section, entry, buf, file);
}

bool wxWriteResource(const wxString& section, const wxString& entry, int value, const wxString& file)
{
    char buf[50];
    sprintf(buf, "%d", value);
    return wxWriteResource(section, entry, buf, file);
}

bool wxGetResource(const wxString& section, const wxString& entry, char **value, const wxString& file)
{
    if (!wxResourceDatabase)
    {
        Display *display = (Display*) wxGetDisplay();
        wxXMergeDatabases (wxTheApp, display);
    }

    XrmDatabase database;

    if (file != "")
    {
        char buffer[500];

        // Is this right? Trying to get it to look in the user's
        // home directory instead of current directory -- JACS
        (void) GetIniFile (buffer, file);

        wxNode *node = wxResourceCache.Find (buffer);
        if (node)
            database = (XrmDatabase) node->Data ();
        else
        {
            database = XrmGetFileDatabase (buffer);
            wxResourceCache.Append (buffer, (wxObject *) database);
        }
    }
    else
        database = wxResourceDatabase;

    XrmValue xvalue;
    char *str_type[20];
    char buf[150];
    strcpy (buf, section);
    strcat (buf, ".");
    strcat (buf, entry);

    Bool success = XrmGetResource (database, buf, "*", str_type,
        &xvalue);
    // Try different combinations of upper/lower case, just in case...
    if (!success)
    {
        buf[0] = (isupper (buf[0]) ? tolower (buf[0]) : toupper (buf[0]));
        success = XrmGetResource (database, buf, "*", str_type,
            &xvalue);
    }
    if (success)
    {
        if (*value)
            delete[] *value;

        *value = new char[xvalue.size + 1];
        strncpy (*value, xvalue.addr, (int) xvalue.size);
        return TRUE;
    }
    return FALSE;
}

bool wxGetResource(const wxString& section, const wxString& entry, float *value, const wxString& file)
{
    char *s = NULL;
    bool succ = wxGetResource(section, entry, (char **)&s, file);
    if (succ)
    {
        *value = (float)strtod(s, NULL);
        delete[] s;
        return TRUE;
    }
    else return FALSE;
}

bool wxGetResource(const wxString& section, const wxString& entry, long *value, const wxString& file)
{
    char *s = NULL;
    bool succ = wxGetResource(section, entry, (char **)&s, file);
    if (succ)
    {
        *value = strtol(s, NULL, 10);
        delete[] s;
        return TRUE;
    }
    else return FALSE;
}

bool wxGetResource(const wxString& section, const wxString& entry, int *value, const wxString& file)
{
    char *s = NULL;
    bool succ = wxGetResource(section, entry, (char **)&s, file);
    if (succ)
    {
        // Handle True, False here
        // True, Yes, Enables, Set or  Activated
        if (*s == 'T' || *s == 'Y' || *s == 'E' || *s == 'S' || *s == 'A')
            *value = TRUE;
        // False, No, Disabled, Reset, Cleared, Deactivated
        else if (*s == 'F' || *s == 'N' || *s == 'D' || *s == 'R' || *s == 'C')
            *value = FALSE;
        // Handle as Integer
        else
            *value = (int) strtol (s, NULL, 10);
        delete[] s;
        return TRUE;
    }
    else
        return FALSE;
}

void wxXMergeDatabases (wxApp * theApp, Display * display)
{
    XrmDatabase homeDB, serverDB, applicationDB;
    char filenamebuf[1024];

    char *filename = &filenamebuf[0];
    char *environment;
    wxString classname = theApp->GetClassName();
    char name[256];
    (void) strcpy (name, "/usr/lib/X11/app-defaults/");
    (void) strcat (name, (const char*) classname);

    /* Get application defaults file, if any */
    applicationDB = XrmGetFileDatabase (name);
    (void) XrmMergeDatabases (applicationDB, &wxResourceDatabase);

    /* Merge server defaults, created by xrdb, loaded as a property of the root
    * window when the server initializes and loaded into the display
    * structure on XOpenDisplay;
    * if not defined, use .Xdefaults
    */

    if (XResourceManagerString (display) != NULL)
    {
        serverDB = XrmGetStringDatabase (XResourceManagerString (display));
    }
    else
    {
        (void) GetIniFile (filename, NULL);
        serverDB = XrmGetFileDatabase (filename);
    }
    XrmMergeDatabases (serverDB, &wxResourceDatabase);

    /* Open XENVIRONMENT file, or if not defined, the .Xdefaults,
    * and merge into existing database
    */

    if ((environment = getenv ("XENVIRONMENT")) == NULL)
    {
        size_t len;
        environment = GetIniFile (filename, NULL);
        len = strlen (environment);
        wxString hostname = wxGetHostName();
        if ( !!hostname )
            strncat(environment, hostname, 1024 - len);
    }
    homeDB = XrmGetFileDatabase (environment);
    XrmMergeDatabases (homeDB, &wxResourceDatabase);
}

#if 0

/*
* Not yet used but may be useful.
*
*/
void
wxSetDefaultResources (const Widget w, const char **resourceSpec, const char *name)
{
    int i;
    Display *dpy = XtDisplay (w);    // Retrieve the display pointer

    XrmDatabase rdb = NULL;    // A resource data base

    // Create an empty resource database
    rdb = XrmGetStringDatabase ("");

    // Add the Component resources, prepending the name of the component

    i = 0;
    while (resourceSpec[i] != NULL)
    {
        char buf[1000];

        sprintf (buf, "*%s%s", name, resourceSpec[i++]);
        XrmPutLineResource (&rdb, buf);
    }

    // Merge them into the Xt database, with lowest precendence

    if (rdb)
    {
#if (XlibSpecificationRelease>=5)
        XrmDatabase db = XtDatabase (dpy);
        XrmCombineDatabase (rdb, &db, FALSE);
#else
        XrmMergeDatabases (dpy->db, &rdb);
        dpy->db = rdb;
#endif
    }
}
#endif
// 0

#endif // wxUSE_RESOURCES

// ----------------------------------------------------------------------------
// busy cursor stuff
// ----------------------------------------------------------------------------

static int wxBusyCursorCount = 0;

// Helper function
static void
wxXSetBusyCursor (wxWindow * win, wxCursor * cursor)
{
    Display *display = (Display*) win->GetXDisplay();

    Window xwin = (Window) win->GetXWindow();
    if (!xwin)
       return;

    XSetWindowAttributes attrs;

    if (cursor)
    {
        attrs.cursor = (Cursor) cursor->GetXCursor(display);
    }
    else
    {
        // Restore old cursor
        if (win->GetCursor().Ok())
            attrs.cursor = (Cursor) win->GetCursor().GetXCursor(display);
        else
            attrs.cursor = None;
    }
    if (xwin)
        XChangeWindowAttributes (display, xwin, CWCursor, &attrs);

    XFlush (display);

    for(wxNode *node = win->GetChildren().First (); node; node = node->Next())
    {
        wxWindow *child = (wxWindow *) node->Data ();
        wxXSetBusyCursor (child, cursor);
    }
}

// Set the cursor to the busy cursor for all windows
void wxBeginBusyCursor(wxCursor *cursor)
{
    wxBusyCursorCount++;
    if (wxBusyCursorCount == 1)
    {
        for(wxNode *node = wxTopLevelWindows.First (); node; node = node->Next())
        {
            wxWindow *win = (wxWindow *) node->Data ();
            wxXSetBusyCursor (win, cursor);
        }
    }
}

// Restore cursor to normal
void wxEndBusyCursor()
{
    if (wxBusyCursorCount == 0)
        return;

    wxBusyCursorCount--;
    if (wxBusyCursorCount == 0)
    {
        for(wxNode *node = wxTopLevelWindows.First (); node; node = node->Next())
        {
            wxWindow *win = (wxWindow *) node->Data ();
            wxXSetBusyCursor (win, NULL);
        }
    }
}

// TRUE if we're between the above two calls
bool wxIsBusy()
{
    return (wxBusyCursorCount > 0);
}

// ----------------------------------------------------------------------------
// display info
// ----------------------------------------------------------------------------

void wxGetMousePosition( int* x, int* y )
{
    XMotionEvent xev;
    Window root, child;
    XQueryPointer((Display*) wxGetDisplay(),
                  DefaultRootWindow((Display*) wxGetDisplay()),
                  &root, &child,
                  &(xev.x_root), &(xev.y_root),
                  &(xev.x),      &(xev.y),
                  &(xev.state));
    *x = xev.x_root;
    *y = xev.y_root;
};

// Return TRUE if we have a colour display
bool wxColourDisplay()
{
    return wxDisplayDepth() > 1;
}

// Returns depth of screen
int wxDisplayDepth()
{
    Display *dpy = (Display*) wxGetDisplay();

    return DefaultDepth (dpy, DefaultScreen (dpy));
}

// Get size of display
void wxDisplaySize(int *width, int *height)
{
    Display *dpy = (Display*) wxGetDisplay();

    if ( width )
        *width = DisplayWidth (dpy, DefaultScreen (dpy));
    if ( height )
        *height = DisplayHeight (dpy, DefaultScreen (dpy));
}

void wxDisplaySizeMM(int *width, int *height)
{
    Display *dpy = (Display*) wxGetDisplay();

    if ( width )
        *width = DisplayWidthMM(dpy, DefaultScreen (dpy));
    if ( height )
        *height = DisplayHeightMM(dpy, DefaultScreen (dpy));
}

void wxClientDisplayRect(int *x, int *y, int *width, int *height)
{
    // This is supposed to return desktop dimensions minus any window
    // manager panels, menus, taskbars, etc.  If there is a way to do that
    // for this platform please fix this function, otherwise it defaults
    // to the entire desktop.
    if (x) *x = 0;
    if (y) *y = 0;
    wxDisplaySize(width, height);
}


// Configurable display in X11
static WXDisplay *gs_currentDisplay = NULL;
static wxString gs_displayName;

WXDisplay *wxGetDisplay()
{
    if (gs_currentDisplay)
        return gs_currentDisplay;
    else if (wxTheApp)
        return wxTheApp->GetInitialDisplay();
    else
        return (WXDisplay*) NULL;
}

bool wxSetDisplay(const wxString& display_name)
{
    gs_displayName = display_name;

    if ( display_name.IsEmpty() )
    {
        gs_currentDisplay = NULL;

        return TRUE;
    }
    else
    {
        Display* display = XOpenDisplay((const char*) display_name);

        if (display)
        {
            gs_currentDisplay = (WXDisplay*) display;
            return TRUE;
        }
        else
            return FALSE;
    }
}

wxString wxGetDisplayName()
{
    return gs_displayName;
}

wxWindow* wxFindWindowAtPoint(const wxPoint& pt)
{
    return wxGenericFindWindowAtPoint(pt);
}

// ----------------------------------------------------------------------------
// accelerators
// ----------------------------------------------------------------------------

// Find the letter corresponding to the mnemonic, for Motif
char wxFindMnemonic (const char *s)
{
    char mnem = 0;
    int len = strlen (s);
    int i;
    for (i = 0; i < len; i++)
    {
        if (s[i] == '&')
        {
            // Carefully handle &&
            if ((i + 1) <= len && s[i + 1] == '&')
                i++;
            else
            {
                mnem = s[i + 1];
                break;
            }
        }
    }
    return mnem;
}

char * wxFindAccelerator (const char *s)
{
    // VZ: this function returns incorrect keysym which completely breaks kbd
    //     handling
    return NULL;

#if 0
   // The accelerator text is after the \t char.
    while (*s && *s != '\t')
        s++;
    if (*s == '\0')
        return (NULL);
    s++;
    /*
    Now we need to format it as X standard:

      input            output

        F7           --> <Key>F7
        Ctrl+N       --> Ctrl<Key>N
        Alt+k        --> Meta<Key>k
        Ctrl+Shift+A --> Ctrl Shift<Key>A

    */

    wxBuffer[0] = '\0';
    char *tmp = copystring (s);
    s = tmp;
    char *p = tmp;

    while (1)
    {
        while (*p && *p != '+')
            p++;
        if (*p)
        {
            *p = '\0';
            if (wxBuffer[0])
                strcat (wxBuffer, " ");
            if (strcmp (s, "Alt"))
                strcat (wxBuffer, s);
            else
                strcat (wxBuffer, "Meta");
            s = p++;
        }
        else
        {
            strcat (wxBuffer, "<Key>");
            strcat (wxBuffer, s);
            break;
        }
    }
    delete[]tmp;
    return wxBuffer;
#endif
}

// ----------------------------------------------------------------------------
// keycode translations
// ----------------------------------------------------------------------------

#include <X11/keysym.h>

// FIXME what about tables??

int wxCharCodeXToWX(KeySym keySym)
{
    int id;
    switch (keySym)
    {
        case XK_Shift_L:
        case XK_Shift_R:
            id = WXK_SHIFT; break;
        case XK_Control_L:
        case XK_Control_R:
            id = WXK_CONTROL; break;
        case XK_BackSpace:
            id = WXK_BACK; break;
        case XK_Delete:
            id = WXK_DELETE; break;
        case XK_Clear:
            id = WXK_CLEAR; break;
        case XK_Tab:
            id = WXK_TAB; break;
        case XK_numbersign:
            id = '#'; break;
        case XK_Return:
            id = WXK_RETURN; break;
        case XK_Escape:
            id = WXK_ESCAPE; break;
        case XK_Pause:
        case XK_Break:
            id = WXK_PAUSE; break;
        case XK_Num_Lock:
            id = WXK_NUMLOCK; break;
        case XK_Scroll_Lock:
            id = WXK_SCROLL; break;

        case XK_Home:
            id = WXK_HOME; break;
        case XK_End:
            id = WXK_END; break;
        case XK_Left:
            id = WXK_LEFT; break;
        case XK_Right:
            id = WXK_RIGHT; break;
        case XK_Up:
            id = WXK_UP; break;
        case XK_Down:
            id = WXK_DOWN; break;
        case XK_Next:
            id = WXK_NEXT; break;
        case XK_Prior:
            id = WXK_PRIOR; break;
        case XK_Menu:
            id = WXK_MENU; break;
        case XK_Select:
            id = WXK_SELECT; break;
        case XK_Cancel:
            id = WXK_CANCEL; break;
        case XK_Print:
            id = WXK_PRINT; break;
        case XK_Execute:
            id = WXK_EXECUTE; break;
        case XK_Insert:
            id = WXK_INSERT; break;
        case XK_Help:
            id = WXK_HELP; break;

        case XK_KP_Multiply:
            id = WXK_MULTIPLY; break;
        case XK_KP_Add:
            id = WXK_ADD; break;
        case XK_KP_Subtract:
            id = WXK_SUBTRACT; break;
        case XK_KP_Divide:
            id = WXK_DIVIDE; break;
        case XK_KP_Decimal:
            id = WXK_DECIMAL; break;
        case XK_KP_Equal:
            id = '='; break;
        case XK_KP_Space:
            id = ' '; break;
        case XK_KP_Tab:
            id = WXK_TAB; break;
        case XK_KP_Enter:
            id = WXK_RETURN; break;
        case XK_KP_0:
            id = WXK_NUMPAD0; break;
        case XK_KP_1:
            id = WXK_NUMPAD1; break;
        case XK_KP_2:
            id = WXK_NUMPAD2; break;
        case XK_KP_3:
            id = WXK_NUMPAD3; break;
        case XK_KP_4:
            id = WXK_NUMPAD4; break;
        case XK_KP_5:
            id = WXK_NUMPAD5; break;
        case XK_KP_6:
            id = WXK_NUMPAD6; break;
        case XK_KP_7:
            id = WXK_NUMPAD7; break;
        case XK_KP_8:
            id = WXK_NUMPAD8; break;
        case XK_KP_9:
            id = WXK_NUMPAD9; break;
        case XK_F1:
            id = WXK_F1; break;
        case XK_F2:
            id = WXK_F2; break;
        case XK_F3:
            id = WXK_F3; break;
        case XK_F4:
            id = WXK_F4; break;
        case XK_F5:
            id = WXK_F5; break;
        case XK_F6:
            id = WXK_F6; break;
        case XK_F7:
            id = WXK_F7; break;
        case XK_F8:
            id = WXK_F8; break;
        case XK_F9:
            id = WXK_F9; break;
        case XK_F10:
            id = WXK_F10; break;
        case XK_F11:
            id = WXK_F11; break;
        case XK_F12:
            id = WXK_F12; break;
        case XK_F13:
            id = WXK_F13; break;
        case XK_F14:
            id = WXK_F14; break;
        case XK_F15:
            id = WXK_F15; break;
        case XK_F16:
            id = WXK_F16; break;
        case XK_F17:
            id = WXK_F17; break;
        case XK_F18:
            id = WXK_F18; break;
        case XK_F19:
            id = WXK_F19; break;
        case XK_F20:
            id = WXK_F20; break;
        case XK_F21:
            id = WXK_F21; break;
        case XK_F22:
            id = WXK_F22; break;
        case XK_F23:
            id = WXK_F23; break;
        case XK_F24:
            id = WXK_F24; break;
        default:
            id = (keySym <= 255) ? (int)keySym : -1;
    }

    return id;
}

KeySym wxCharCodeWXToX(int id)
{
    KeySym keySym;

    switch (id)
    {
        case WXK_CANCEL:            keySym = XK_Cancel; break;
        case WXK_BACK:              keySym = XK_BackSpace; break;
        case WXK_TAB:            keySym = XK_Tab; break;
        case WXK_CLEAR:        keySym = XK_Clear; break;
        case WXK_RETURN:        keySym = XK_Return; break;
        case WXK_SHIFT:        keySym = XK_Shift_L; break;
        case WXK_CONTROL:        keySym = XK_Control_L; break;
        case WXK_MENU :        keySym = XK_Menu; break;
        case WXK_PAUSE:        keySym = XK_Pause; break;
        case WXK_ESCAPE:        keySym = XK_Escape; break;
        case WXK_SPACE:        keySym = ' '; break;
        case WXK_PRIOR:        keySym = XK_Prior; break;
        case WXK_NEXT :        keySym = XK_Next; break;
        case WXK_END:        keySym = XK_End; break;
        case WXK_HOME :        keySym = XK_Home; break;
        case WXK_LEFT :        keySym = XK_Left; break;
        case WXK_UP:        keySym = XK_Up; break;
        case WXK_RIGHT:        keySym = XK_Right; break;
        case WXK_DOWN :        keySym = XK_Down; break;
        case WXK_SELECT:        keySym = XK_Select; break;
        case WXK_PRINT:        keySym = XK_Print; break;
        case WXK_EXECUTE:        keySym = XK_Execute; break;
        case WXK_INSERT:        keySym = XK_Insert; break;
        case WXK_DELETE:        keySym = XK_Delete; break;
        case WXK_HELP :        keySym = XK_Help; break;
        case WXK_NUMPAD0:        keySym = XK_KP_0; break;
        case WXK_NUMPAD1:        keySym = XK_KP_1; break;
        case WXK_NUMPAD2:        keySym = XK_KP_2; break;
        case WXK_NUMPAD3:        keySym = XK_KP_3; break;
        case WXK_NUMPAD4:        keySym = XK_KP_4; break;
        case WXK_NUMPAD5:        keySym = XK_KP_5; break;
        case WXK_NUMPAD6:        keySym = XK_KP_6; break;
        case WXK_NUMPAD7:        keySym = XK_KP_7; break;
        case WXK_NUMPAD8:        keySym = XK_KP_8; break;
        case WXK_NUMPAD9:        keySym = XK_KP_9; break;
        case WXK_MULTIPLY:        keySym = XK_KP_Multiply; break;
        case WXK_ADD:        keySym = XK_KP_Add; break;
        case WXK_SUBTRACT:        keySym = XK_KP_Subtract; break;
        case WXK_DECIMAL:        keySym = XK_KP_Decimal; break;
        case WXK_DIVIDE:        keySym = XK_KP_Divide; break;
        case WXK_F1:        keySym = XK_F1; break;
        case WXK_F2:        keySym = XK_F2; break;
        case WXK_F3:        keySym = XK_F3; break;
        case WXK_F4:        keySym = XK_F4; break;
        case WXK_F5:        keySym = XK_F5; break;
        case WXK_F6:        keySym = XK_F6; break;
        case WXK_F7:        keySym = XK_F7; break;
        case WXK_F8:        keySym = XK_F8; break;
        case WXK_F9:        keySym = XK_F9; break;
        case WXK_F10:        keySym = XK_F10; break;
        case WXK_F11:        keySym = XK_F11; break;
        case WXK_F12:        keySym = XK_F12; break;
        case WXK_F13:        keySym = XK_F13; break;
        case WXK_F14:        keySym = XK_F14; break;
        case WXK_F15:        keySym = XK_F15; break;
        case WXK_F16:        keySym = XK_F16; break;
        case WXK_F17:        keySym = XK_F17; break;
        case WXK_F18:        keySym = XK_F18; break;
        case WXK_F19:        keySym = XK_F19; break;
        case WXK_F20:        keySym = XK_F20; break;
        case WXK_F21:        keySym = XK_F21; break;
        case WXK_F22:        keySym = XK_F22; break;
        case WXK_F23:        keySym = XK_F23; break;
        case WXK_F24:        keySym = XK_F24; break;
        case WXK_NUMLOCK:    keySym = XK_Num_Lock; break;
        case WXK_SCROLL:     keySym = XK_Scroll_Lock; break;
        default:             keySym = id <= 255 ? (KeySym)id : 0;
    }

    return keySym;
}

// ----------------------------------------------------------------------------
// Some colour manipulation routines
// ----------------------------------------------------------------------------

void wxHSVToXColor(wxHSV *hsv,XColor *rgb)
{
    int h = hsv->h;
    int s = hsv->s;
    int v = hsv->v;
    int r = 0, g = 0, b = 0;
    int i, f;
    int p, q, t;
    s = (s * wxMAX_RGB) / wxMAX_SV;
    v = (v * wxMAX_RGB) / wxMAX_SV;
    if (h == 360) h = 0;
    if (s == 0) { h = 0; r = g = b = v; }
    i = h / 60;
    f = h % 60;
    p = v * (wxMAX_RGB - s) / wxMAX_RGB;
    q = v * (wxMAX_RGB - s * f / 60) / wxMAX_RGB;
    t = v * (wxMAX_RGB - s * (60 - f) / 60) / wxMAX_RGB;
    switch (i)
    {
    case 0: r = v, g = t, b = p; break;
    case 1: r = q, g = v, b = p; break;
    case 2: r = p, g = v, b = t; break;
    case 3: r = p, g = q, b = v; break;
    case 4: r = t, g = p, b = v; break;
    case 5: r = v, g = p, b = q; break;
    }
    rgb->red = r << 8;
    rgb->green = g << 8;
    rgb->blue = b << 8;
}

void wxXColorToHSV(wxHSV *hsv,XColor *rgb)
{
    int r = rgb->red >> 8;
    int g = rgb->green >> 8;
    int b = rgb->blue >> 8;
    int maxv = wxMax3(r, g, b);
    int minv = wxMin3(r, g, b);
    int h = 0, s, v;
    v = maxv;
    if (maxv) s = (maxv - minv) * wxMAX_RGB / maxv;
    else s = 0;
    if (s == 0) h = 0;
    else
    {
        int rc, gc, bc, hex = 0;
        rc = (maxv - r) * wxMAX_RGB / (maxv - minv);
        gc = (maxv - g) * wxMAX_RGB / (maxv - minv);
        bc = (maxv - b) * wxMAX_RGB / (maxv - minv);
        if (r == maxv) { h = bc - gc, hex = 0; }
        else if (g == maxv) { h = rc - bc, hex = 2; }
        else if (b == maxv) { h = gc - rc, hex = 4; }
        h = hex * 60 + (h * 60 / wxMAX_RGB);
        if (h < 0) h += 360;
    }
    hsv->h = h;
    hsv->s = (s * wxMAX_SV) / wxMAX_RGB;
    hsv->v = (v * wxMAX_SV) / wxMAX_RGB;
}

void wxAllocNearestColor(Display *d,Colormap cmp,XColor *xc)
{
    int llp;

    int screen = DefaultScreen(d);
    int num_colors = DisplayCells(d,screen);

    XColor *color_defs = new XColor[num_colors];
    for(llp = 0;llp < num_colors;llp++) color_defs[llp].pixel = llp;
    XQueryColors(d,cmp,color_defs,num_colors);

    wxHSV hsv_defs, hsv;
    wxXColorToHSV(&hsv,xc);

    int diff, min_diff = 0, pixel = 0;

    for(llp = 0;llp < num_colors;llp++)
    {
        wxXColorToHSV(&hsv_defs,&color_defs[llp]);
        diff = wxSIGN(wxH_WEIGHT * (hsv.h - hsv_defs.h)) +
            wxSIGN(wxS_WEIGHT * (hsv.s - hsv_defs.s)) +
            wxSIGN(wxV_WEIGHT * (hsv.v - hsv_defs.v));
        if (llp == 0) min_diff = diff;
        if (min_diff > diff) { min_diff = diff; pixel = llp; }
        if (min_diff == 0) break;
    }

    xc -> red = color_defs[pixel].red;
    xc -> green = color_defs[pixel].green;
    xc -> blue = color_defs[pixel].blue;
    xc -> flags = DoRed | DoGreen | DoBlue;

/*  FIXME, TODO
    if (!XAllocColor(d,cmp,xc))
        cout << "wxAllocNearestColor : Warning : Cannot find nearest color !\n";
*/

    delete[] color_defs;
}

void wxAllocColor(Display *d,Colormap cmp,XColor *xc)
{
    if (!XAllocColor(d,cmp,xc))
    {
        //          cout << "wxAllocColor : Warning : Can not allocate color, attempt find nearest !\n";
        wxAllocNearestColor(d,cmp,xc);
    }
}