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|
/*
* tkSelect.c --
*
* This file manages the selection for the Tk toolkit, translating
* between the standard X ICCCM conventions and Tcl commands.
*
* Copyright (c) 1990-1993 The Regents of the University of California.
* Copyright (c) 1994-1997 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: tkSelect.c,v 1.20 2007/04/17 14:36:49 dkf Exp $
*/
#include "tkInt.h"
#include "tkSelect.h"
/*
* When a selection handler is set up by invoking "selection handle", one of
* the following data structures is set up to hold information about the
* command to invoke and its interpreter.
*/
typedef struct {
Tcl_Interp *interp; /* Interpreter in which to invoke command. */
int cmdLength; /* # of non-NULL bytes in command. */
int charOffset; /* The offset of the next char to retrieve. */
int byteOffset; /* The expected byte offset of the next
* chunk. */
char buffer[TCL_UTF_MAX]; /* A buffer to hold part of a UTF character
* that is split across chunks. */
char command[4]; /* Command to invoke. Actual space is
* allocated as large as necessary. This must
* be the last entry in the structure. */
} CommandInfo;
/*
* When selection ownership is claimed with the "selection own" Tcl command,
* one of the following structures is created to record the Tcl command to be
* executed when the selection is lost again.
*/
typedef struct LostCommand {
Tcl_Interp *interp; /* Interpreter in which to invoke command. */
char command[4]; /* Command to invoke. Actual space is
* allocated as large as necessary. This must
* be the last entry in the structure. */
} LostCommand;
/*
* The structure below is used to keep each thread's pending list separate.
*/
typedef struct ThreadSpecificData {
TkSelInProgress *pendingPtr;
/* Topmost search in progress, or NULL if
* none. */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;
/*
* Forward declarations for functions defined in this file:
*/
static int HandleTclCommand(ClientData clientData,
int offset, char *buffer, int maxBytes);
static void LostSelection(ClientData clientData);
static int SelGetProc(ClientData clientData,
Tcl_Interp *interp, char *portion);
/*
*--------------------------------------------------------------
*
* Tk_CreateSelHandler --
*
* This function is called to register a function as the handler for
* selection requests of a particular target type on a particular window
* for a particular selection.
*
* Results:
* None.
*
* Side effects:
* In the future, whenever the selection is in tkwin's window and someone
* requests the selection in the form given by target, proc will be
* invoked to provide part or all of the selection in the given form. If
* there was already a handler declared for the given window, target and
* selection type, then it is replaced. Proc should have the following
* form:
*
* int
* proc(
* ClientData clientData,
* int offset,
* char *buffer,
* int maxBytes)
* {
* }
*
* The clientData argument to proc will be the same as the clientData
* argument to this function. The offset argument indicates which portion
* of the selection to return: skip the first offset bytes. Buffer is a
* pointer to an area in which to place the converted selection, and
* maxBytes gives the number of bytes available at buffer. Proc should
* place the selection in buffer as a string, and return a count of the
* number of bytes of selection actually placed in buffer (not including
* the terminating NULL character). If the return value equals maxBytes,
* this is a sign that there is probably still more selection information
* available.
*
*--------------------------------------------------------------
*/
void
Tk_CreateSelHandler(
Tk_Window tkwin, /* Token for window. */
Atom selection, /* Selection to be handled. */
Atom target, /* The kind of selection conversions that can
* be handled by proc, e.g. TARGETS or
* STRING. */
Tk_SelectionProc *proc, /* Function to invoke to convert selection to
* type "target". */
ClientData clientData, /* Value to pass to proc. */
Atom format) /* Format in which the selection information
* should be returned to the requestor.
* XA_STRING is best by far, but anything
* listed in the ICCCM will be tolerated
* (blech). */
{
register TkSelHandler *selPtr;
TkWindow *winPtr = (TkWindow *) tkwin;
if (winPtr->dispPtr->multipleAtom == None) {
TkSelInit(tkwin);
}
/*
* See if there's already a handler for this target and selection on this
* window. If so, re-use it. If not, create a new one.
*/
for (selPtr = winPtr->selHandlerList; ; selPtr = selPtr->nextPtr) {
if (selPtr == NULL) {
selPtr = (TkSelHandler *) ckalloc(sizeof(TkSelHandler));
selPtr->nextPtr = winPtr->selHandlerList;
winPtr->selHandlerList = selPtr;
break;
}
if ((selPtr->selection == selection) && (selPtr->target == target)) {
/*
* Special case: when replacing handler created by "selection
* handle", free up memory. Should there be a callback to allow
* other clients to do this too?
*/
if (selPtr->proc == HandleTclCommand) {
ckfree((char *) selPtr->clientData);
}
break;
}
}
selPtr->selection = selection;
selPtr->target = target;
selPtr->format = format;
selPtr->proc = proc;
selPtr->clientData = clientData;
if (format == XA_STRING) {
selPtr->size = 8;
} else {
selPtr->size = 32;
}
if ((target == XA_STRING) && (winPtr->dispPtr->utf8Atom != (Atom) NULL)) {
/*
* If the user asked for a STRING handler and we understand
* UTF8_STRING, we implicitly create a UTF8_STRING handler for them.
*/
target = winPtr->dispPtr->utf8Atom;
for (selPtr = winPtr->selHandlerList; ; selPtr = selPtr->nextPtr) {
if (selPtr == NULL) {
selPtr = (TkSelHandler *) ckalloc(sizeof(TkSelHandler));
selPtr->nextPtr = winPtr->selHandlerList;
winPtr->selHandlerList = selPtr;
selPtr->selection = selection;
selPtr->target = target;
selPtr->format = target; /* We want UTF8_STRING format */
selPtr->proc = proc;
if (selPtr->proc == HandleTclCommand) {
/*
* The clientData is selection controlled memory, so we
* should make a copy for this selPtr.
*/
unsigned cmdInfoLen = sizeof(CommandInfo) +
((CommandInfo*)clientData)->cmdLength - 3;
selPtr->clientData = (ClientData)ckalloc(cmdInfoLen);
memcpy(selPtr->clientData, clientData, cmdInfoLen);
} else {
selPtr->clientData = clientData;
}
selPtr->size = 8;
break;
}
if (selPtr->selection==selection && selPtr->target==target) {
/*
* Looks like we had a utf-8 target already. Leave it alone.
*/
break;
}
}
}
}
/*
*----------------------------------------------------------------------
*
* Tk_DeleteSelHandler --
*
* Remove the selection handler for a given window, target, and
* selection, if it exists.
*
* Results:
* None.
*
* Side effects:
* The selection handler for tkwin and target is removed. If there is no
* such handler then nothing happens.
*
*----------------------------------------------------------------------
*/
void
Tk_DeleteSelHandler(
Tk_Window tkwin, /* Token for window. */
Atom selection, /* The selection whose handler is to be
* removed. */
Atom target) /* The target whose selection handler is to be
* removed. */
{
TkWindow *winPtr = (TkWindow *) tkwin;
register TkSelHandler *selPtr, *prevPtr;
register TkSelInProgress *ipPtr;
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
/*
* Find the selection handler to be deleted, or return if it doesn't
* exist.
*/
for (selPtr = winPtr->selHandlerList, prevPtr = NULL; ;
prevPtr = selPtr, selPtr = selPtr->nextPtr) {
if (selPtr == NULL) {
return;
}
if ((selPtr->selection == selection) && (selPtr->target == target)) {
break;
}
}
/*
* If ConvertSelection is processing this handler, tell it that the
* handler is dead.
*/
for (ipPtr = tsdPtr->pendingPtr; ipPtr != NULL;
ipPtr = ipPtr->nextPtr) {
if (ipPtr->selPtr == selPtr) {
ipPtr->selPtr = NULL;
}
}
/*
* Free resources associated with the handler.
*/
if (prevPtr == NULL) {
winPtr->selHandlerList = selPtr->nextPtr;
} else {
prevPtr->nextPtr = selPtr->nextPtr;
}
if ((target == XA_STRING) && (winPtr->dispPtr->utf8Atom != (Atom) NULL)) {
/*
* If the user asked for a STRING handler and we understand
* UTF8_STRING, we may have implicitly created a UTF8_STRING handler
* for them. Look for it and delete it as necessary.
*/
TkSelHandler *utf8selPtr;
target = winPtr->dispPtr->utf8Atom;
for (utf8selPtr = winPtr->selHandlerList; utf8selPtr != NULL;
utf8selPtr = utf8selPtr->nextPtr) {
if ((utf8selPtr->selection == selection)
&& (utf8selPtr->target == target)) {
break;
}
}
if (utf8selPtr != NULL) {
if ((utf8selPtr->format == target)
&& (utf8selPtr->proc == selPtr->proc)
&& (utf8selPtr->size == selPtr->size)) {
/*
* This recursive call is OK, because we've changed the value
* of 'target'.
*/
Tk_DeleteSelHandler(tkwin, selection, target);
}
}
}
if (selPtr->proc == HandleTclCommand) {
/*
* Mark the CommandInfo as deleted and free it if we can.
*/
((CommandInfo*)selPtr->clientData)->interp = NULL;
Tcl_EventuallyFree(selPtr->clientData, TCL_DYNAMIC);
}
ckfree((char *) selPtr);
}
/*
*--------------------------------------------------------------
*
* Tk_OwnSelection --
*
* Arrange for tkwin to become the owner of a selection.
*
* Results:
* None.
*
* Side effects:
* From now on, requests for the selection will be directed to functions
* associated with tkwin (they must have been declared with calls to
* Tk_CreateSelHandler). When the selection is lost by this window, proc
* will be invoked (see the manual entry for details). This function may
* invoke callbacks, including Tcl scripts, so any calling function
* should be reentrant at the point where Tk_OwnSelection is invoked.
*
*--------------------------------------------------------------
*/
void
Tk_OwnSelection(
Tk_Window tkwin, /* Window to become new selection owner. */
Atom selection, /* Selection that window should own. */
Tk_LostSelProc *proc, /* Function to call when selection is taken
* away from tkwin. */
ClientData clientData) /* Arbitrary one-word argument to pass to
* proc. */
{
register TkWindow *winPtr = (TkWindow *) tkwin;
TkDisplay *dispPtr = winPtr->dispPtr;
TkSelectionInfo *infoPtr;
Tk_LostSelProc *clearProc = NULL;
ClientData clearData = NULL;/* Initialization needed only to prevent
* compiler warning. */
if (dispPtr->multipleAtom == None) {
TkSelInit(tkwin);
}
Tk_MakeWindowExist(tkwin);
/*
* This code is somewhat tricky. First, we find the specified selection on
* the selection list. If the previous owner is in this process, and is a
* different window, then we need to invoke the clearProc. However, it's
* dangerous to call the clearProc right now, because it could invoke a
* Tcl script that wrecks the current state (e.g. it could delete the
* window). To be safe, defer the call until the end of the function when
* we no longer care about the state.
*/
for (infoPtr = dispPtr->selectionInfoPtr; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr->selection == selection) {
break;
}
}
if (infoPtr == NULL) {
infoPtr = (TkSelectionInfo*) ckalloc(sizeof(TkSelectionInfo));
infoPtr->selection = selection;
infoPtr->nextPtr = dispPtr->selectionInfoPtr;
dispPtr->selectionInfoPtr = infoPtr;
} else if (infoPtr->clearProc != NULL) {
if (infoPtr->owner != tkwin) {
clearProc = infoPtr->clearProc;
clearData = infoPtr->clearData;
} else if (infoPtr->clearProc == LostSelection) {
/*
* If the selection handler is one created by "selection own", be
* sure to free the record for it; otherwise there will be a
* memory leak.
*/
ckfree((char *) infoPtr->clearData);
}
}
infoPtr->owner = tkwin;
infoPtr->serial = NextRequest(winPtr->display);
infoPtr->clearProc = proc;
infoPtr->clearData = clientData;
/*
* Note that we are using CurrentTime, even though ICCCM recommends
* against this practice (the problem is that we don't necessarily have a
* valid time to use). We will not be able to retrieve a useful timestamp
* for the TIMESTAMP target later.
*/
infoPtr->time = CurrentTime;
/*
* Note that we are not checking to see if the selection claim succeeded.
* If the ownership does not change, then the clearProc may never be
* invoked, and we will return incorrect information when queried for the
* current selection owner.
*/
XSetSelectionOwner(winPtr->display, infoPtr->selection, winPtr->window,
infoPtr->time);
/*
* Now that we are done, we can invoke clearProc without running into
* reentrancy problems.
*/
if (clearProc != NULL) {
(*clearProc)(clearData);
}
}
/*
*----------------------------------------------------------------------
*
* Tk_ClearSelection --
*
* Eliminate the specified selection on tkwin's display, if there is one.
*
* Results:
* None.
*
* Side effects:
* The specified selection is cleared, so that future requests to
* retrieve it will fail until some application owns it again. This
* function invokes callbacks, possibly including Tcl scripts, so any
* calling function should be reentrant at the point Tk_ClearSelection is
* invoked.
*
*----------------------------------------------------------------------
*/
void
Tk_ClearSelection(
Tk_Window tkwin, /* Window that selects a display. */
Atom selection) /* Selection to be cancelled. */
{
register TkWindow *winPtr = (TkWindow *) tkwin;
TkDisplay *dispPtr = winPtr->dispPtr;
TkSelectionInfo *infoPtr;
TkSelectionInfo *prevPtr;
TkSelectionInfo *nextPtr;
Tk_LostSelProc *clearProc = NULL;
ClientData clearData = NULL;/* Initialization needed only to prevent
* compiler warning. */
if (dispPtr->multipleAtom == None) {
TkSelInit(tkwin);
}
for (infoPtr = dispPtr->selectionInfoPtr, prevPtr = NULL;
infoPtr != NULL; infoPtr = nextPtr) {
nextPtr = infoPtr->nextPtr;
if (infoPtr->selection == selection) {
if (prevPtr == NULL) {
dispPtr->selectionInfoPtr = nextPtr;
} else {
prevPtr->nextPtr = nextPtr;
}
break;
}
prevPtr = infoPtr;
}
if (infoPtr != NULL) {
clearProc = infoPtr->clearProc;
clearData = infoPtr->clearData;
ckfree((char *) infoPtr);
}
XSetSelectionOwner(winPtr->display, selection, None, CurrentTime);
if (clearProc != NULL) {
(*clearProc)(clearData);
}
}
/*
*--------------------------------------------------------------
*
* Tk_GetSelection --
*
* Retrieve the value of a selection and pass it off (in pieces,
* possibly) to a given function.
*
* Results:
* The return value is a standard Tcl return value. If an error occurs
* (such as no selection exists) then an error message is left in the
* interp's result.
*
* Side effects:
* The standard X11 protocols are used to retrieve the selection. When it
* arrives, it is passed to proc. If the selection is very large, it will
* be passed to proc in several pieces. Proc should have the following
* structure:
*
* int
* proc(
* ClientData clientData,
* Tcl_Interp *interp,
* char *portion)
* {
* }
*
* The interp and clientData arguments to proc will be the same as the
* corresponding arguments to Tk_GetSelection. The portion argument
* points to a character string containing part of the selection, and
* numBytes indicates the length of the portion, not including the
* terminating NULL character. If the selection arrives in several
* pieces, the "portion" arguments in separate calls will contain
* successive parts of the selection. Proc should normally return TCL_OK.
* If it detects an error then it should return TCL_ERROR and leave an
* error message in the interp's result; the remainder of the selection
* retrieval will be aborted.
*
*--------------------------------------------------------------
*/
int
Tk_GetSelection(
Tcl_Interp *interp, /* Interpreter to use for reporting errors. */
Tk_Window tkwin, /* Window on whose behalf to retrieve the
* selection (determines display from which to
* retrieve). */
Atom selection, /* Selection to retrieve. */
Atom target, /* Desired form in which selection is to be
* returned. */
Tk_GetSelProc *proc, /* Function to call to process the selection,
* once it has been retrieved. */
ClientData clientData) /* Arbitrary value to pass to proc. */
{
TkWindow *winPtr = (TkWindow *) tkwin;
TkDisplay *dispPtr = winPtr->dispPtr;
TkSelectionInfo *infoPtr;
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
if (dispPtr->multipleAtom == None) {
TkSelInit(tkwin);
}
/*
* If the selection is owned by a window managed by this process, then
* call the retrieval function directly, rather than going through the X
* server (it's dangerous to go through the X server in this case because
* it could result in deadlock if an INCR-style selection results).
*/
for (infoPtr = dispPtr->selectionInfoPtr; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr->selection == selection) {
break;
}
}
if (infoPtr != NULL) {
register TkSelHandler *selPtr;
int offset, result, count;
char buffer[TK_SEL_BYTES_AT_ONCE+1];
TkSelInProgress ip;
for (selPtr = ((TkWindow *) infoPtr->owner)->selHandlerList;
selPtr != NULL; selPtr = selPtr->nextPtr) {
if (selPtr->target==target && selPtr->selection==selection) {
break;
}
}
if (selPtr == NULL) {
Atom type;
count = TkSelDefaultSelection(infoPtr, target, buffer,
TK_SEL_BYTES_AT_ONCE, &type);
if (count > TK_SEL_BYTES_AT_ONCE) {
Tcl_Panic("selection handler returned too many bytes");
}
if (count < 0) {
goto cantget;
}
buffer[count] = 0;
result = (*proc)(clientData, interp, buffer);
} else {
offset = 0;
result = TCL_OK;
ip.selPtr = selPtr;
ip.nextPtr = tsdPtr->pendingPtr;
tsdPtr->pendingPtr = &ip;
while (1) {
count = (selPtr->proc)(selPtr->clientData, offset, buffer,
TK_SEL_BYTES_AT_ONCE);
if ((count < 0) || (ip.selPtr == NULL)) {
tsdPtr->pendingPtr = ip.nextPtr;
goto cantget;
}
if (count > TK_SEL_BYTES_AT_ONCE) {
Tcl_Panic("selection handler returned too many bytes");
}
buffer[count] = '\0';
result = (*proc)(clientData, interp, buffer);
if ((result != TCL_OK) || (count < TK_SEL_BYTES_AT_ONCE)
|| (ip.selPtr == NULL)) {
break;
}
offset += count;
}
tsdPtr->pendingPtr = ip.nextPtr;
}
return result;
}
/*
* The selection is owned by some other process.
*/
return TkSelGetSelection(interp, tkwin, selection, target, proc,
clientData);
cantget:
Tcl_AppendResult(interp, Tk_GetAtomName(tkwin, selection),
" selection doesn't exist or form \"",
Tk_GetAtomName(tkwin, target), "\" not defined", NULL);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* Tk_SelectionObjCmd --
*
* This function is invoked to process the "selection" Tcl command. See
* the user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
Tk_SelectionObjCmd(
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 = (Tk_Window) clientData;
char *path = NULL;
Atom selection;
char *selName = NULL, *string;
int count, index;
Tcl_Obj **objs;
static CONST char *optionStrings[] = {
"clear", "get", "handle", "own", NULL
};
enum options {
SELECTION_CLEAR, SELECTION_GET, SELECTION_HANDLE, SELECTION_OWN
};
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], optionStrings, "option", 0,
&index) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum options) index) {
case SELECTION_CLEAR: {
static CONST char *clearOptionStrings[] = {
"-displayof", "-selection", NULL
};
enum clearOptions { CLEAR_DISPLAYOF, CLEAR_SELECTION };
int clearIndex;
for (count = objc-2, objs = ((Tcl_Obj **)objv)+2; count > 0;
count-=2, objs+=2) {
string = Tcl_GetString(objs[0]);
if (string[0] != '-') {
break;
}
if (count < 2) {
Tcl_AppendResult(interp, "value for \"", string,
"\" missing", NULL);
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objs[0], clearOptionStrings,
"option", 0, &clearIndex) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum clearOptions) clearIndex) {
case CLEAR_DISPLAYOF:
path = Tcl_GetString(objs[1]);
break;
case CLEAR_SELECTION:
selName = Tcl_GetString(objs[1]);
break;
}
}
if (count == 1) {
path = Tcl_GetString(objs[0]);
} else if (count > 1) {
Tcl_WrongNumArgs(interp, 2, objv, "?options?");
return TCL_ERROR;
}
if (path != NULL) {
tkwin = Tk_NameToWindow(interp, path, tkwin);
}
if (tkwin == NULL) {
return TCL_ERROR;
}
if (selName != NULL) {
selection = Tk_InternAtom(tkwin, selName);
} else {
selection = XA_PRIMARY;
}
Tk_ClearSelection(tkwin, selection);
break;
}
case SELECTION_GET: {
Atom target;
char *targetName = NULL;
Tcl_DString selBytes;
int result;
static CONST char *getOptionStrings[] = {
"-displayof", "-selection", "-type", NULL
};
enum getOptions { GET_DISPLAYOF, GET_SELECTION, GET_TYPE };
int getIndex;
for (count = objc-2, objs = ((Tcl_Obj **)objv)+2; count>0;
count-=2, objs+=2) {
string = Tcl_GetString(objs[0]);
if (string[0] != '-') {
break;
}
if (count < 2) {
Tcl_AppendResult(interp, "value for \"", string,
"\" missing", NULL);
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objs[0], getOptionStrings,
"option", 0, &getIndex) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum getOptions) getIndex) {
case GET_DISPLAYOF:
path = Tcl_GetString(objs[1]);
break;
case GET_SELECTION:
selName = Tcl_GetString(objs[1]);
break;
case GET_TYPE:
targetName = Tcl_GetString(objs[1]);
break;
}
}
if (path != NULL) {
tkwin = Tk_NameToWindow(interp, path, tkwin);
}
if (tkwin == NULL) {
return TCL_ERROR;
}
if (selName != NULL) {
selection = Tk_InternAtom(tkwin, selName);
} else {
selection = XA_PRIMARY;
}
if (count > 1) {
Tcl_WrongNumArgs(interp, 2, objv, "?options?");
return TCL_ERROR;
} else if (count == 1) {
target = Tk_InternAtom(tkwin, Tcl_GetString(objs[0]));
} else if (targetName != NULL) {
target = Tk_InternAtom(tkwin, targetName);
} else {
target = XA_STRING;
}
Tcl_DStringInit(&selBytes);
result = Tk_GetSelection(interp, tkwin, selection, target,
SelGetProc, (ClientData) &selBytes);
if (result == TCL_OK) {
Tcl_DStringResult(interp, &selBytes);
} else {
Tcl_DStringFree(&selBytes);
}
return result;
}
case SELECTION_HANDLE: {
Atom target, format;
char *targetName = NULL;
char *formatName = NULL;
register CommandInfo *cmdInfoPtr;
int cmdLength;
static CONST char *handleOptionStrings[] = {
"-format", "-selection", "-type", NULL
};
enum handleOptions {
HANDLE_FORMAT, HANDLE_SELECTION, HANDLE_TYPE
};
int handleIndex;
for (count = objc-2, objs = ((Tcl_Obj **)objv)+2; count > 0;
count-=2, objs+=2) {
string = Tcl_GetString(objs[0]);
if (string[0] != '-') {
break;
}
if (count < 2) {
Tcl_AppendResult(interp, "value for \"", string,
"\" missing", NULL);
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objs[0],handleOptionStrings,
"option", 0, &handleIndex) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum handleOptions) handleIndex) {
case HANDLE_FORMAT:
formatName = Tcl_GetString(objs[1]);
break;
case HANDLE_SELECTION:
selName = Tcl_GetString(objs[1]);
break;
case HANDLE_TYPE:
targetName = Tcl_GetString(objs[1]);
break;
}
}
if ((count < 2) || (count > 4)) {
Tcl_WrongNumArgs(interp, 2, objv, "?options? window command");
return TCL_ERROR;
}
tkwin = Tk_NameToWindow(interp, Tcl_GetString(objs[0]), tkwin);
if (tkwin == NULL) {
return TCL_ERROR;
}
if (selName != NULL) {
selection = Tk_InternAtom(tkwin, selName);
} else {
selection = XA_PRIMARY;
}
if (count > 2) {
target = Tk_InternAtom(tkwin, Tcl_GetString(objs[2]));
} else if (targetName != NULL) {
target = Tk_InternAtom(tkwin, targetName);
} else {
target = XA_STRING;
}
if (count > 3) {
format = Tk_InternAtom(tkwin, Tcl_GetString(objs[3]));
} else if (formatName != NULL) {
format = Tk_InternAtom(tkwin, formatName);
} else {
format = XA_STRING;
}
string = Tcl_GetStringFromObj(objs[1], &cmdLength);
if (cmdLength == 0) {
Tk_DeleteSelHandler(tkwin, selection, target);
} else {
cmdInfoPtr = (CommandInfo *) ckalloc((unsigned) (
sizeof(CommandInfo) - 3 + cmdLength));
cmdInfoPtr->interp = interp;
cmdInfoPtr->charOffset = 0;
cmdInfoPtr->byteOffset = 0;
cmdInfoPtr->buffer[0] = '\0';
cmdInfoPtr->cmdLength = cmdLength;
strcpy(cmdInfoPtr->command, string);
Tk_CreateSelHandler(tkwin, selection, target, HandleTclCommand,
(ClientData) cmdInfoPtr, format);
}
return TCL_OK;
}
case SELECTION_OWN: {
register LostCommand *lostPtr;
char *script = NULL;
int cmdLength;
static CONST char *ownOptionStrings[] = {
"-command", "-displayof", "-selection", NULL
};
enum ownOptions { OWN_COMMAND, OWN_DISPLAYOF, OWN_SELECTION };
int ownIndex;
for (count = objc-2, objs = ((Tcl_Obj **)objv)+2; count > 0;
count-=2, objs+=2) {
string = Tcl_GetString(objs[0]);
if (string[0] != '-') {
break;
}
if (count < 2) {
Tcl_AppendResult(interp, "value for \"", string,
"\" missing", NULL);
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objs[0], ownOptionStrings,
"option", 0, &ownIndex) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum ownOptions) ownIndex) {
case OWN_COMMAND:
script = Tcl_GetString(objs[1]);
break;
case OWN_DISPLAYOF:
path = Tcl_GetString(objs[1]);
break;
case OWN_SELECTION:
selName = Tcl_GetString(objs[1]);
break;
}
}
if (count > 2) {
Tcl_WrongNumArgs(interp, 2, objv, "?options? ?window?");
return TCL_ERROR;
}
if (selName != NULL) {
selection = Tk_InternAtom(tkwin, selName);
} else {
selection = XA_PRIMARY;
}
if (count == 0) {
TkSelectionInfo *infoPtr;
TkWindow *winPtr;
if (path != NULL) {
tkwin = Tk_NameToWindow(interp, path, tkwin);
}
if (tkwin == NULL) {
return TCL_ERROR;
}
winPtr = (TkWindow *)tkwin;
for (infoPtr = winPtr->dispPtr->selectionInfoPtr;
infoPtr != NULL; infoPtr = infoPtr->nextPtr) {
if (infoPtr->selection == selection) {
break;
}
}
/*
* Ignore the internal clipboard window.
*/
if ((infoPtr != NULL)
&& (infoPtr->owner != winPtr->dispPtr->clipWindow)) {
Tcl_SetResult(interp, Tk_PathName(infoPtr->owner), TCL_STATIC);
}
return TCL_OK;
}
tkwin = Tk_NameToWindow(interp, Tcl_GetString(objs[0]), tkwin);
if (tkwin == NULL) {
return TCL_ERROR;
}
if (count == 2) {
script = Tcl_GetString(objs[1]);
}
if (script == NULL) {
Tk_OwnSelection(tkwin, selection, NULL, (ClientData) NULL);
return TCL_OK;
}
cmdLength = strlen(script);
lostPtr = (LostCommand *) ckalloc((unsigned) (sizeof(LostCommand)
-3 + cmdLength));
lostPtr->interp = interp;
strcpy(lostPtr->command, script);
Tk_OwnSelection(tkwin, selection, LostSelection, (ClientData) lostPtr);
return TCL_OK;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TkSelGetInProgress --
*
* This function returns a pointer to the thread-local list of pending
* searches.
*
* Results:
* The return value is a pointer to the first search in progress, or NULL
* if there are none.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
TkSelInProgress *
TkSelGetInProgress(void)
{
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
return tsdPtr->pendingPtr;
}
/*
*----------------------------------------------------------------------
*
* TkSelSetInProgress --
*
* This function is used to set the thread-local list of pending
* searches. It is required because the pending list is kept in thread
* local storage.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkSelSetInProgress(
TkSelInProgress *pendingPtr)
{
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
tsdPtr->pendingPtr = pendingPtr;
}
/*
*----------------------------------------------------------------------
*
* TkSelDeadWindow --
*
* This function is invoked just before a TkWindow is deleted. It
* performs selection-related cleanup.
*
* Results:
* None.
*
* Side effects:
* Frees up memory associated with the selection.
*
*----------------------------------------------------------------------
*/
void
TkSelDeadWindow(
register TkWindow *winPtr) /* Window that's being deleted. */
{
register TkSelHandler *selPtr;
register TkSelInProgress *ipPtr;
TkSelectionInfo *infoPtr, *prevPtr, *nextPtr;
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
/*
* While deleting all the handlers, be careful to check whether
* ConvertSelection or TkSelPropProc are about to process one of the
* deleted handlers.
*/
while (winPtr->selHandlerList != NULL) {
selPtr = winPtr->selHandlerList;
winPtr->selHandlerList = selPtr->nextPtr;
for (ipPtr = tsdPtr->pendingPtr; ipPtr != NULL;
ipPtr = ipPtr->nextPtr) {
if (ipPtr->selPtr == selPtr) {
ipPtr->selPtr = NULL;
}
}
if (selPtr->proc == HandleTclCommand) {
/*
* Mark the CommandInfo as deleted and free it when we can.
*/
((CommandInfo*)selPtr->clientData)->interp = NULL;
Tcl_EventuallyFree(selPtr->clientData, TCL_DYNAMIC);
}
ckfree((char *) selPtr);
}
/*
* Remove selections owned by window being deleted.
*/
for (infoPtr = winPtr->dispPtr->selectionInfoPtr, prevPtr = NULL;
infoPtr != NULL; infoPtr = nextPtr) {
nextPtr = infoPtr->nextPtr;
if (infoPtr->owner == (Tk_Window) winPtr) {
if (infoPtr->clearProc == LostSelection) {
ckfree((char *) infoPtr->clearData);
}
ckfree((char *) infoPtr);
infoPtr = prevPtr;
if (prevPtr == NULL) {
winPtr->dispPtr->selectionInfoPtr = nextPtr;
} else {
prevPtr->nextPtr = nextPtr;
}
}
prevPtr = infoPtr;
}
}
/*
*----------------------------------------------------------------------
*
* TkSelInit --
*
* Initialize selection-related information for a display.
*
* Results:
* None.
*
* Side effects:
* Selection-related information is initialized.
*
*----------------------------------------------------------------------
*/
void
TkSelInit(
Tk_Window tkwin) /* Window token (used to find display to
* initialize). */
{
register TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;
/*
* Fetch commonly-used atoms.
*/
dispPtr->multipleAtom = Tk_InternAtom(tkwin, "MULTIPLE");
dispPtr->incrAtom = Tk_InternAtom(tkwin, "INCR");
dispPtr->targetsAtom = Tk_InternAtom(tkwin, "TARGETS");
dispPtr->timestampAtom = Tk_InternAtom(tkwin, "TIMESTAMP");
dispPtr->textAtom = Tk_InternAtom(tkwin, "TEXT");
dispPtr->compoundTextAtom = Tk_InternAtom(tkwin, "COMPOUND_TEXT");
dispPtr->applicationAtom = Tk_InternAtom(tkwin, "TK_APPLICATION");
dispPtr->windowAtom = Tk_InternAtom(tkwin, "TK_WINDOW");
dispPtr->clipboardAtom = Tk_InternAtom(tkwin, "CLIPBOARD");
/*
* Using UTF8_STRING instead of the XA_UTF8_STRING macro allows us to
* support older X servers that didn't have UTF8_STRING yet. This is
* necessary on Unix systems. For more information, see:
* http://www.cl.cam.ac.uk/~mgk25/unicode.html#x11
*/
#if !(defined(__WIN32__) || defined(MAC_OSX_TK))
dispPtr->utf8Atom = Tk_InternAtom(tkwin, "UTF8_STRING");
#else
dispPtr->utf8Atom = (Atom) NULL;
#endif
}
/*
*----------------------------------------------------------------------
*
* TkSelClearSelection --
*
* This function is invoked to process a SelectionClear event.
*
* Results:
* None.
*
* Side effects:
* Invokes the clear function for the window which lost the
* selection.
*
*----------------------------------------------------------------------
*/
void
TkSelClearSelection(
Tk_Window tkwin, /* Window for which event was targeted. */
register XEvent *eventPtr) /* X SelectionClear event. */
{
register TkWindow *winPtr = (TkWindow *) tkwin;
TkDisplay *dispPtr = winPtr->dispPtr;
TkSelectionInfo *infoPtr;
TkSelectionInfo *prevPtr;
/*
* Invoke clear function for window that just lost the selection. This
* code is a bit tricky, because any callbacks due to selection changes
* between windows managed by the process have already been made. Thus,
* ignore the event unless it refers to the window that's currently the
* selection owner and the event was generated after the server saw the
* SetSelectionOwner request.
*/
for (infoPtr = dispPtr->selectionInfoPtr, prevPtr = NULL;
infoPtr != NULL; infoPtr = infoPtr->nextPtr) {
if (infoPtr->selection == eventPtr->xselectionclear.selection) {
break;
}
prevPtr = infoPtr;
}
if (infoPtr != NULL && (infoPtr->owner == tkwin) &&
(eventPtr->xselectionclear.serial >= (unsigned) infoPtr->serial)) {
if (prevPtr == NULL) {
dispPtr->selectionInfoPtr = infoPtr->nextPtr;
} else {
prevPtr->nextPtr = infoPtr->nextPtr;
}
/*
* Because of reentrancy problems, calling clearProc must be done
* after the infoPtr has been removed from the selectionInfoPtr list
* (clearProc could modify the list, e.g. by creating a new
* selection).
*/
if (infoPtr->clearProc != NULL) {
(*infoPtr->clearProc)(infoPtr->clearData);
}
ckfree((char *) infoPtr);
}
}
/*
*--------------------------------------------------------------
*
* SelGetProc --
*
* This function is invoked to process pieces of the selection as they
* arrive during "selection get" commands.
*
* Results:
* Always returns TCL_OK.
*
* Side effects:
* Bytes get appended to the dynamic string pointed to by the clientData
* argument.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static int
SelGetProc(
ClientData clientData, /* Dynamic string holding partially assembled
* selection. */
Tcl_Interp *interp, /* Interpreter used for error reporting (not
* used). */
char *portion) /* New information to be appended. */
{
Tcl_DStringAppend((Tcl_DString *) clientData, portion, -1);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* HandleTclCommand --
*
* This function acts as selection handler for handlers created by the
* "selection handle" command. It invokes a Tcl command to retrieve the
* selection.
*
* Results:
* The return value is a count of the number of bytes actually stored at
* buffer, or -1 if an error occurs while executing the Tcl command to
* retrieve the selection.
*
* Side effects:
* None except for things done by the Tcl command.
*
*----------------------------------------------------------------------
*/
static int
HandleTclCommand(
ClientData clientData, /* Information about command to execute. */
int offset, /* Return selection bytes starting at this
* offset. */
char *buffer, /* Place to store converted selection. */
int maxBytes) /* Maximum # of bytes to store at buffer. */
{
CommandInfo *cmdInfoPtr = (CommandInfo *) clientData;
int spaceNeeded, length;
#define MAX_STATIC_SIZE 100
char staticSpace[MAX_STATIC_SIZE];
char *command, *string;
Tcl_Interp *interp = cmdInfoPtr->interp;
Tcl_DString oldResult;
Tcl_Obj *objPtr;
int extraBytes, charOffset, count, numChars;
CONST char *p;
/*
* We must also protect the interpreter and the command from being deleted
* too soon.
*/
Tcl_Preserve(clientData);
Tcl_Preserve((ClientData) interp);
/*
* Compute the proper byte offset in the case where the last chunk split a
* character.
*/
if (offset == cmdInfoPtr->byteOffset) {
charOffset = cmdInfoPtr->charOffset;
extraBytes = strlen(cmdInfoPtr->buffer);
if (extraBytes > 0) {
strcpy(buffer, cmdInfoPtr->buffer);
maxBytes -= extraBytes;
buffer += extraBytes;
}
} else {
cmdInfoPtr->byteOffset = 0;
cmdInfoPtr->charOffset = 0;
extraBytes = 0;
charOffset = 0;
}
/*
* First, generate a command by taking the command string and appending
* the offset and maximum # of bytes.
*/
spaceNeeded = cmdInfoPtr->cmdLength + 30;
if (spaceNeeded < MAX_STATIC_SIZE) {
command = staticSpace;
} else {
command = (char *) ckalloc((unsigned) spaceNeeded);
}
sprintf(command, "%s %d %d", cmdInfoPtr->command, charOffset, maxBytes);
/*
* Execute the command. Be sure to restore the state of the interpreter
* after executing the command.
*/
Tcl_DStringInit(&oldResult);
Tcl_DStringGetResult(interp, &oldResult);
if (TkCopyAndGlobalEval(interp, command) == TCL_OK) {
objPtr = Tcl_GetObjResult(interp);
string = Tcl_GetStringFromObj(objPtr, &length);
count = (length > maxBytes) ? maxBytes : length;
memcpy(buffer, string, (size_t) count);
buffer[count] = '\0';
/*
* Update the partial character information for the next retrieval if
* the command has not been deleted.
*/
if (cmdInfoPtr->interp != NULL) {
if (length <= maxBytes) {
cmdInfoPtr->charOffset += Tcl_NumUtfChars(string, -1);
cmdInfoPtr->buffer[0] = '\0';
} else {
p = string;
string += count;
numChars = 0;
while (p < string) {
p = Tcl_UtfNext(p);
numChars++;
}
cmdInfoPtr->charOffset += numChars;
length = p - string;
if (length > 0) {
strncpy(cmdInfoPtr->buffer, string, (size_t) length);
}
cmdInfoPtr->buffer[length] = '\0';
}
cmdInfoPtr->byteOffset += count + extraBytes;
}
count += extraBytes;
} else {
count = -1;
}
Tcl_DStringResult(interp, &oldResult);
if (command != staticSpace) {
ckfree(command);
}
Tcl_Release(clientData);
Tcl_Release((ClientData) interp);
return count;
}
/*
*----------------------------------------------------------------------
*
* TkSelDefaultSelection --
*
* This function is called to generate selection information for a few
* standard targets such as TIMESTAMP and TARGETS. It is invoked only if
* no handler has been declared by the application.
*
* Results:
* If "target" is a standard target understood by this function, the
* selection is converted to that form and stored as a character string
* in buffer. The type of the selection (e.g. STRING or ATOM) is stored
* in *typePtr, and the return value is a count of the # of non-NULL
* bytes at buffer. If the target wasn't understood, or if there isn't
* enough space at buffer to hold the entire selection (no INCR-mode
* transfers for this stuff!), then -1 is returned.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TkSelDefaultSelection(
TkSelectionInfo *infoPtr, /* Info about selection being retrieved. */
Atom target, /* Desired form of selection. */
char *buffer, /* Place to put selection characters. */
int maxBytes, /* Maximum # of bytes to store at buffer. */
Atom *typePtr) /* Store here the type of the selection, for
* use in converting to proper X format. */
{
register TkWindow *winPtr = (TkWindow *) infoPtr->owner;
TkDisplay *dispPtr = winPtr->dispPtr;
if (target == dispPtr->timestampAtom) {
if (maxBytes < 20) {
return -1;
}
sprintf(buffer, "0x%x", (unsigned int) infoPtr->time);
*typePtr = XA_INTEGER;
return strlen(buffer);
}
if (target == dispPtr->targetsAtom) {
register TkSelHandler *selPtr;
int length;
Tcl_DString ds;
if (maxBytes < 50) {
return -1;
}
Tcl_DStringInit(&ds);
Tcl_DStringAppend(&ds,
"MULTIPLE TARGETS TIMESTAMP TK_APPLICATION TK_WINDOW", -1);
for (selPtr = winPtr->selHandlerList; selPtr != NULL;
selPtr = selPtr->nextPtr) {
if ((selPtr->selection == infoPtr->selection)
&& (selPtr->target != dispPtr->applicationAtom)
&& (selPtr->target != dispPtr->windowAtom)) {
CONST char *atomString = Tk_GetAtomName((Tk_Window) winPtr,
selPtr->target);
Tcl_DStringAppendElement(&ds, atomString);
}
}
length = Tcl_DStringLength(&ds);
if (length >= maxBytes) {
Tcl_DStringFree(&ds);
return -1;
}
memcpy(buffer, Tcl_DStringValue(&ds), (unsigned) (1+length));
Tcl_DStringFree(&ds);
*typePtr = XA_ATOM;
return length;
}
if (target == dispPtr->applicationAtom) {
int length;
Tk_Uid name = winPtr->mainPtr->winPtr->nameUid;
length = strlen(name);
if (maxBytes <= length) {
return -1;
}
strcpy(buffer, name);
*typePtr = XA_STRING;
return length;
}
if (target == dispPtr->windowAtom) {
int length;
char *name = winPtr->pathName;
length = strlen(name);
if (maxBytes <= length) {
return -1;
}
strcpy(buffer, name);
*typePtr = XA_STRING;
return length;
}
return -1;
}
/*
*----------------------------------------------------------------------
*
* LostSelection --
*
* This function is invoked when a window has lost ownership of the
* selection and the ownership was claimed with the command "selection
* own".
*
* Results:
* None.
*
* Side effects:
* A Tcl script is executed; it can do almost anything.
*
*----------------------------------------------------------------------
*/
static void
LostSelection(
ClientData clientData) /* Pointer to LostCommand structure. */
{
LostCommand *lostPtr = (LostCommand *) clientData;
Tcl_Obj *objPtr;
Tcl_Interp *interp;
interp = lostPtr->interp;
Tcl_Preserve((ClientData) interp);
/*
* Execute the command. Save the interpreter's result, if any, and restore
* it after executing the command.
*/
objPtr = Tcl_GetObjResult(interp);
Tcl_IncrRefCount(objPtr);
Tcl_ResetResult(interp);
if (TkCopyAndGlobalEval(interp, lostPtr->command) != TCL_OK) {
Tcl_BackgroundError(interp);
}
Tcl_SetObjResult(interp, objPtr);
Tcl_DecrRefCount(objPtr);
Tcl_Release((ClientData) interp);
/*
* Free the storage for the command, since we're done with it now.
*/
ckfree((char *) lostPtr);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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