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/*
* tkAtom.c --
*
* This file manages a cache of X Atoms in order to avoid interactions
* with the X server. It's much like the Xmu routines, except it has a
* cleaner interface (caller doesn't have to provide permanent storage
* for atom names, for example).
*
* Copyright (c) 1990-1994 The Regents of the University of California.
* Copyright (c) 1994 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: tkAtom.c,v 1.9 2008/10/28 22:33:06 nijtmans Exp $
*/
#include "tkInt.h"
/*
* The following are a list of the predefined atom strings. They should match
* those found in xatom.h
*/
static const char * atomNameArray[] = {
"PRIMARY", "SECONDARY", "ARC",
"ATOM", "BITMAP", "CARDINAL",
"COLORMAP", "CURSOR", "CUT_BUFFER0",
"CUT_BUFFER1", "CUT_BUFFER2", "CUT_BUFFER3",
"CUT_BUFFER4", "CUT_BUFFER5", "CUT_BUFFER6",
"CUT_BUFFER7", "DRAWABLE", "FONT",
"INTEGER", "PIXMAP", "POINT",
"RECTANGLE", "RESOURCE_MANAGER", "RGB_COLOR_MAP",
"RGB_BEST_MAP", "RGB_BLUE_MAP", "RGB_DEFAULT_MAP",
"RGB_GRAY_MAP", "RGB_GREEN_MAP", "RGB_RED_MAP",
"STRING", "VISUALID", "WINDOW",
"WM_COMMAND", "WM_HINTS", "WM_CLIENT_MACHINE",
"WM_ICON_NAME", "WM_ICON_SIZE", "WM_NAME",
"WM_NORMAL_HINTS", "WM_SIZE_HINTS", "WM_ZOOM_HINTS",
"MIN_SPACE", "NORM_SPACE", "MAX_SPACE",
"END_SPACE", "SUPERSCRIPT_X", "SUPERSCRIPT_Y",
"SUBSCRIPT_X", "SUBSCRIPT_Y", "UNDERLINE_POSITION",
"UNDERLINE_THICKNESS", "STRIKEOUT_ASCENT", "STRIKEOUT_DESCENT",
"ITALIC_ANGLE", "X_HEIGHT", "QUAD_WIDTH",
"WEIGHT", "POINT_SIZE", "RESOLUTION",
"COPYRIGHT", "NOTICE", "FONT_NAME",
"FAMILY_NAME", "FULL_NAME", "CAP_HEIGHT",
"WM_CLASS", "WM_TRANSIENT_FOR",
NULL
};
/*
* Forward references to functions defined in this file:
*/
static void AtomInit(TkDisplay *dispPtr);
/*
*--------------------------------------------------------------
*
* Tk_InternAtom --
*
* Given a string, produce the equivalent X atom. This function is
* equivalent to XInternAtom, except that it keeps a local cache of
* atoms. Once a name is known, the server need not be contacted again
* for that name.
*
* Results:
* The return value is the Atom corresponding to name.
*
* Side effects:
* A new entry may be added to the local atom cache.
*
*--------------------------------------------------------------
*/
Atom
Tk_InternAtom(
Tk_Window tkwin, /* Window token; map name to atom for this
* window's display. */
const char *name) /* Name to turn into atom. */
{
register TkDisplay *dispPtr;
register Tcl_HashEntry *hPtr;
int isNew;
dispPtr = ((TkWindow *) tkwin)->dispPtr;
if (!dispPtr->atomInit) {
AtomInit(dispPtr);
}
hPtr = Tcl_CreateHashEntry(&dispPtr->nameTable, name, &isNew);
if (isNew) {
Tcl_HashEntry *hPtr2;
Atom atom;
atom = XInternAtom(dispPtr->display, name, False);
Tcl_SetHashValue(hPtr, atom);
hPtr2 = Tcl_CreateHashEntry(&dispPtr->atomTable, (char*) atom, &isNew);
Tcl_SetHashValue(hPtr2, Tcl_GetHashKey(&dispPtr->nameTable, hPtr));
}
return (Atom) Tcl_GetHashValue(hPtr);
}
/*
*--------------------------------------------------------------
*
* Tk_GetAtomName --
*
* This function is equivalent to XGetAtomName except that it uses the
* local atom cache to avoid contacting the server.
*
* Results:
* The return value is a character string corresponding to the atom given
* by "atom". This string's storage space is static: it need not be freed
* by the caller, and should not be modified by the caller. If "atom"
* doesn't exist on tkwin's display, then the string "?bad atom?" is
* returned.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
const char *
Tk_GetAtomName(
Tk_Window tkwin, /* Window token; map atom to name relative to
* this window's display. */
Atom atom) /* Atom whose name is wanted. */
{
register TkDisplay *dispPtr;
register Tcl_HashEntry *hPtr;
dispPtr = ((TkWindow *) tkwin)->dispPtr;
if (!dispPtr->atomInit) {
AtomInit(dispPtr);
}
hPtr = Tcl_FindHashEntry(&dispPtr->atomTable, (char *) atom);
if (hPtr == NULL) {
const char *name;
Tk_ErrorHandler handler;
int isNew, mustFree;
handler = Tk_CreateErrorHandler(dispPtr->display, BadAtom, -1, -1,
NULL, (ClientData) NULL);
name = XGetAtomName(dispPtr->display, atom);
mustFree = 1;
if (name == NULL) {
name = "?bad atom?";
mustFree = 0;
}
Tk_DeleteErrorHandler(handler);
hPtr = Tcl_CreateHashEntry(&dispPtr->nameTable, name, &isNew);
Tcl_SetHashValue(hPtr, atom);
if (mustFree) {
XFree(name);
}
name = Tcl_GetHashKey(&dispPtr->nameTable, hPtr);
hPtr = Tcl_CreateHashEntry(&dispPtr->atomTable, (char *) atom, &isNew);
Tcl_SetHashValue(hPtr, name);
}
return Tcl_GetHashValue(hPtr);
}
/*
*--------------------------------------------------------------
*
* AtomInit --
*
* Initialize atom-related information for a display.
*
* Results:
* None.
*
* Side effects:
* Tables get initialized, etc. etc..
*
*--------------------------------------------------------------
*/
static void
AtomInit(
register TkDisplay *dispPtr)/* Display to initialize. */
{
Tcl_HashEntry *hPtr;
Atom atom;
dispPtr->atomInit = 1;
Tcl_InitHashTable(&dispPtr->nameTable, TCL_STRING_KEYS);
Tcl_InitHashTable(&dispPtr->atomTable, TCL_ONE_WORD_KEYS);
for (atom = 1; atom <= XA_LAST_PREDEFINED; atom++) {
const char *name;
int isNew;
hPtr = Tcl_FindHashEntry(&dispPtr->atomTable, (char *) atom);
if (hPtr != NULL) {
continue;
}
name = atomNameArray[atom - 1];
hPtr = Tcl_CreateHashEntry(&dispPtr->nameTable, name, &isNew);
Tcl_SetHashValue(hPtr, atom);
name = Tcl_GetHashKey(&dispPtr->nameTable, hPtr);
hPtr = Tcl_CreateHashEntry(&dispPtr->atomTable, (char *) atom, &isNew);
Tcl_SetHashValue(hPtr, name);
}
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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