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stk/Tk/generic/tkFocus.c

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/*
* tkFocus.c --
*
* This file contains procedures that manage the input
* focus for Tk.
*
* Copyright (c) 1990-1994 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.
*
* SCCS: @(#) tkFocus.c 1.48 97/10/31 09:55:22
*/
#include "tkInt.h"
#include "tkPort.h"
/*
* For each top-level window that has ever received the focus, there
* is a record of the following type:
*/
typedef struct TkToplevelFocusInfo {
TkWindow *topLevelPtr; /* Information about top-level window. */
TkWindow *focusWinPtr; /* The next time the focus comes to this
* top-level, it will be given to this
* window. */
struct TkToplevelFocusInfo *nextPtr;
/* Next in list of all toplevel focus records
* for a given application. */
} ToplevelFocusInfo;
/*
* One of the following structures exists for each display used by
* each application. These are linked together from the TkMainInfo
* structure. These structures are needed because it isn't
* sufficient to store a single piece of focus information in each
* display or in each application: we need the cross-product.
* There needs to be separate information for each display, because
* it's possible to have multiple focus windows active simultaneously
* on different displays. There also needs to be separate information
* for each application, because of embedding: if an embedded
* application has the focus, its container application also has
* the focus. Thus we keep a list of structures for each application:
* the same display can appear in structures for several applications
* at once.
*/
typedef struct TkDisplayFocusInfo {
TkDisplay *dispPtr; /* Display that this information pertains
* to. */
struct TkWindow *focusWinPtr;
/* Window that currently has the focus for
* this application on this display, or NULL
* if none. */
struct TkWindow *focusOnMapPtr;
/* This points to a toplevel window that is
* supposed to receive the X input focus as
* soon as it is mapped (needed to handle the
* fact that X won't allow the focus on an
* unmapped window). NULL means no delayed
* focus op in progress for this display. */
int forceFocus; /* Associated with focusOnMapPtr: non-zero
* means claim the focus even if some other
* application currently has it. */
unsigned long focusSerial; /* Serial number of last request this
* application made to change the focus on
* this display. Used to identify stale
* focus notifications coming from the
* X server. */
struct TkDisplayFocusInfo *nextPtr;
/* Next in list of all display focus
* records for a given application. */
} DisplayFocusInfo;
/*
* Global used for debugging.
*/
int tclFocusDebug = 0;
/*
* The following magic value is stored in the "send_event" field of
* FocusIn and FocusOut events that are generated in this file. This
* allows us to separate "real" events coming from the server from
* those that we generated.
*/
#define GENERATED_EVENT_MAGIC ((Bool) 0x547321ac)
/*
* Forward declarations for procedures defined in this file:
*/
static DisplayFocusInfo *FindDisplayFocusInfo _ANSI_ARGS_((TkMainInfo *mainPtr,
TkDisplay *dispPtr));
static void FocusMapProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static void GenerateFocusEvents _ANSI_ARGS_((TkWindow *sourcePtr,
TkWindow *destPtr));
static void SetFocus _ANSI_ARGS_((TkWindow *winPtr, int force));
/*
*--------------------------------------------------------------
*
* Tk_FocusCmd --
*
* This procedure is invoked to process the "focus" 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_FocusCmd(clientData, interp, argc, argv)
ClientData clientData; /* Main window associated with
* interpreter. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
Tk_Window tkwin = (Tk_Window) clientData;
TkWindow *winPtr = (TkWindow *) clientData;
TkWindow *newPtr, *focusWinPtr, *topLevelPtr;
ToplevelFocusInfo *tlFocusPtr;
char c;
size_t length;
/*
* If invoked with no arguments, just return the current focus window.
*/
if (argc == 1) {
focusWinPtr = TkGetFocusWin(winPtr);
if (focusWinPtr != NULL) {
#ifdef STk_CODE
STk_sharp_dot_result(interp, focusWinPtr->pathName);
#else
interp->result = focusWinPtr->pathName;
#endif
}
#ifdef STk_CODE
else
interp->result = "#f";
#endif
return TCL_OK;
}
/*
* If invoked with a single argument beginning with "." then focus
* on that window.
*/
if (argc == 2) {
if (argv[1][0] == 0) {
return TCL_OK;
}
if (argv[1][0] == '.') {
newPtr = (TkWindow *) Tk_NameToWindow(interp, argv[1], tkwin);
if (newPtr == NULL) {
return TCL_ERROR;
}
if (!(newPtr->flags & TK_ALREADY_DEAD)) {
SetFocus(newPtr, 0);
}
return TCL_OK;
}
}
length = strlen(argv[1]);
c = argv[1][1];
if ((c == 'd') && (strncmp(argv[1], "-displayof", length) == 0)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
#ifdef STk_CODE
argv[0], " :displayof window\"", (char *) NULL);
#else
argv[0], " -displayof window\"", (char *) NULL);
#endif
return TCL_ERROR;
}
newPtr = (TkWindow *) Tk_NameToWindow(interp, argv[2], tkwin);
if (newPtr == NULL) {
return TCL_ERROR;
}
newPtr = TkGetFocusWin(newPtr);
if (newPtr != NULL) {
interp->result = newPtr->pathName;
}
} else if ((c == 'f') && (strncmp(argv[1], "-force", length) == 0)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
#ifdef STk_CODE
argv[0], " :force window\"", (char *) NULL);
#else
argv[0], " -force window\"", (char *) NULL);
#endif
return TCL_ERROR;
}
if (argv[2][0] == 0) {
return TCL_OK;
}
newPtr = (TkWindow *) Tk_NameToWindow(interp, argv[2], tkwin);
if (newPtr == NULL) {
return TCL_ERROR;
}
SetFocus(newPtr, 1);
} else if ((c == 'l') && (strncmp(argv[1], "-lastfor", length) == 0)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
#ifdef STk_CODE
argv[0], " :lastfor window\"", (char *) NULL);
#else
argv[0], " -lastfor window\"", (char *) NULL);
#endif
return TCL_ERROR;
}
newPtr = (TkWindow *) Tk_NameToWindow(interp, argv[2], tkwin);
if (newPtr == NULL) {
return TCL_ERROR;
}
for (topLevelPtr = newPtr; topLevelPtr != NULL;
topLevelPtr = topLevelPtr->parentPtr) {
if (topLevelPtr->flags & TK_TOP_LEVEL) {
for (tlFocusPtr = newPtr->mainPtr->tlFocusPtr;
tlFocusPtr != NULL;
tlFocusPtr = tlFocusPtr->nextPtr) {
if (tlFocusPtr->topLevelPtr == topLevelPtr) {
#ifdef STk_CODE
STk_sharp_dot_result(interp,
tlFocusPtr->focusWinPtr->pathName);
#else
interp->result = tlFocusPtr->focusWinPtr->pathName;
#endif
return TCL_OK;
}
}
#ifdef STk_CODE
STk_sharp_dot_result(interp, topLevelPtr->pathName);
#else
interp->result = topLevelPtr->pathName;
#endif
return TCL_OK;
}
}
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
#ifdef STk_CODE
"\": must be :displayof, :force, or :lastfor", (char *) NULL);
#else
"\": must be -displayof, -force, or -lastfor", (char *) NULL);
#endif
return TCL_ERROR;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* TkFocusFilterEvent --
*
* This procedure is invoked by Tk_HandleEvent when it encounters
* a FocusIn, FocusOut, Enter, or Leave event.
*
* Results:
* A return value of 1 means that Tk_HandleEvent should process
* the event normally (i.e. event handlers should be invoked).
* A return value of 0 means that this event should be ignored.
*
* Side effects:
* Additional events may be generated, and the focus may switch.
*
*--------------------------------------------------------------
*/
int
TkFocusFilterEvent(winPtr, eventPtr)
TkWindow *winPtr; /* Window that focus event is directed to. */
XEvent *eventPtr; /* FocusIn, FocusOut, Enter, or Leave
* event. */
{
/*
* Design notes: the window manager and X server work together to
* transfer the focus among top-level windows. This procedure takes
* care of transferring the focus from a top-level or wrapper window
* to the actual window within that top-level that has the focus.
* We do this by synthesizing X events to move the focus around.
* None of the FocusIn and FocusOut events generated by X are ever
* used outside of this procedure; only the synthesized events get
* through to the rest of the application. At one point (e.g.
* Tk4.0b1) Tk used to call X to move the focus from a top-level to
* one of its descendants, then just pass through the events
* generated by X. This approach didn't work very well, for a
* variety of reasons. For example, if X generates the events they
* go at the back of the event queue, which could cause problems if
* other things have already happened, such as moving the focus to
* yet another window.
*/
ToplevelFocusInfo *tlFocusPtr;
DisplayFocusInfo *displayFocusPtr;
TkDisplay *dispPtr = winPtr->dispPtr;
TkWindow *newFocusPtr;
int retValue, delta;
/*
* If this was a generated event, just turn off the generated
* flag and pass the event through to Tk bindings.
*/
if (eventPtr->xfocus.send_event == GENERATED_EVENT_MAGIC) {
eventPtr->xfocus.send_event = 0;
return 1;
}
/*
* Check for special events generated by embedded applications to
* request the input focus. If this is one of those events, make
* the change in focus and return without any additional processing
* of the event (note: the "detail" field of the event indicates
* whether to claim the focus even if we don't already have it).
*/
if ((eventPtr->xfocus.mode == EMBEDDED_APP_WANTS_FOCUS)
&& (eventPtr->type == FocusIn)) {
SetFocus(winPtr, eventPtr->xfocus.detail);
return 0;
}
/*
* This was not a generated event. We'll return 1 (so that the
* event will be processed) if it's an Enter or Leave event, and
* 0 (so that the event won't be processed) if it's a FocusIn or
* FocusOut event.
*/
retValue = 0;
displayFocusPtr = FindDisplayFocusInfo(winPtr->mainPtr, winPtr->dispPtr);
if (eventPtr->type == FocusIn) {
/*
* Skip FocusIn events that cause confusion
* NotifyVirtual and NotifyNonlinearVirtual - Virtual events occur
* on windows in between the origin and destination of the
* focus change. For FocusIn we may see this when focus
* goes into an embedded child. We don't care about this,
* although we may end up getting a NotifyPointer later.
* NotifyInferior - focus is coming to us from an embedded child.
* When focus is on an embeded focus, we still think we have
* the focus, too, so this message doesn't change our state.
* NotifyPointerRoot - should never happen because this is sent
* to the root window.
*
* Interesting FocusIn events are
* NotifyAncestor - focus is coming from our parent, probably the root.
* NotifyNonlinear - focus is coming from a different branch, probably
* another toplevel.
* NotifyPointer - implicit focus because of the mouse position.
* This is only interesting on toplevels, when it means that the
* focus has been set to the root window but the mouse is over
* this toplevel. We take the focus implicitly (probably no
* window manager)
*/
if ((eventPtr->xfocus.detail == NotifyVirtual)
|| (eventPtr->xfocus.detail == NotifyNonlinearVirtual)
|| (eventPtr->xfocus.detail == NotifyPointerRoot)
|| (eventPtr->xfocus.detail == NotifyInferior)) {
return retValue;
}
} else if (eventPtr->type == FocusOut) {
/*
* Skip FocusOut events that cause confusion.
* NotifyPointer - the pointer is in us or a child, and we are losing
* focus because of an XSetInputFocus. Other focus events
* will set our state properly.
* NotifyPointerRoot - should never happen because this is sent
* to the root window.
* NotifyInferior - focus leaving us for an embedded child. We
* retain a notion of focus when an embedded child has focus.
*
* Interesting events are:
* NotifyAncestor - focus is going to root.
* NotifyNonlinear - focus is going to another branch, probably
* another toplevel.
* NotifyVirtual, NotifyNonlinearVirtual - focus is passing through,
* and we need to make sure we track this.
*/
if ((eventPtr->xfocus.detail == NotifyPointer)
|| (eventPtr->xfocus.detail == NotifyPointerRoot)
|| (eventPtr->xfocus.detail == NotifyInferior)) {
return retValue;
}
} else {
retValue = 1;
if (eventPtr->xcrossing.detail == NotifyInferior) {
return retValue;
}
}
/*
* If winPtr isn't a top-level window than just ignore the event.
*/
winPtr = TkWmFocusToplevel(winPtr);
if (winPtr == NULL) {
return retValue;
}
/*
* If there is a grab in effect and this window is outside the
* grabbed tree, then ignore the event.
*/
if (TkGrabState(winPtr) == TK_GRAB_EXCLUDED) {
return retValue;
}
/*
* It is possible that there were outstanding FocusIn and FocusOut
* events on their way to us at the time the focus was changed
* internally with the "focus" command. If so, these events could
* potentially cause us to lose the focus (switch it to the window
* of the last FocusIn event) even though the focus change occurred
* after those events. The following code detects this and ignores
* the stale events.
*
* Note: the focusSerial is only generated by TkpChangeFocus,
* whereas in Tk 4.2 there was always a nop marker generated.
*/
delta = eventPtr->xfocus.serial - displayFocusPtr->focusSerial;
if (delta < 0) {
return retValue;
}
/*
* Find the ToplevelFocusInfo structure for the window, and make a new one
* if there isn't one already.
*/
for (tlFocusPtr = winPtr->mainPtr->tlFocusPtr; tlFocusPtr != NULL;
tlFocusPtr = tlFocusPtr->nextPtr) {
if (tlFocusPtr->topLevelPtr == winPtr) {
break;
}
}
if (tlFocusPtr == NULL) {
tlFocusPtr = (ToplevelFocusInfo *) ckalloc(sizeof(ToplevelFocusInfo));
tlFocusPtr->topLevelPtr = tlFocusPtr->focusWinPtr = winPtr;
tlFocusPtr->nextPtr = winPtr->mainPtr->tlFocusPtr;
winPtr->mainPtr->tlFocusPtr = tlFocusPtr;
}
newFocusPtr = tlFocusPtr->focusWinPtr;
if (eventPtr->type == FocusIn) {
GenerateFocusEvents(displayFocusPtr->focusWinPtr, newFocusPtr);
displayFocusPtr->focusWinPtr = newFocusPtr;
dispPtr->focusPtr = newFocusPtr;
/*
* NotifyPointer gets set when the focus has been set to the root window
* but we have the pointer. We'll treat this like an implicit
* focus in event so that upon Leave events we release focus.
*/
if (!(winPtr->flags & TK_EMBEDDED)) {
if (eventPtr->xfocus.detail == NotifyPointer) {
dispPtr->implicitWinPtr = winPtr;
} else {
dispPtr->implicitWinPtr = NULL;
}
}
} else if (eventPtr->type == FocusOut) {
GenerateFocusEvents(displayFocusPtr->focusWinPtr, (TkWindow *) NULL);
/*
* Reset dispPtr->focusPtr, but only if it currently is the same
* as this application's focusWinPtr: this check is needed to
* handle embedded applications in the same process.
*/
if (dispPtr->focusPtr == displayFocusPtr->focusWinPtr) {
dispPtr->focusPtr = NULL;
}
displayFocusPtr->focusWinPtr = NULL;
} else if (eventPtr->type == EnterNotify) {
/*
* If there is no window manager, or if the window manager isn't
* moving the focus around (e.g. the disgusting "NoTitleFocus"
* option has been selected in twm), then we won't get FocusIn
* or FocusOut events. Instead, the "focus" field will be set
* in an Enter event to indicate that we've already got the focus
* when the mouse enters the window (even though we didn't get
* a FocusIn event). Watch for this and grab the focus when it
* happens. Note: if this is an embedded application then don't
* accept the focus implicitly like this; the container
* application will give us the focus explicitly if it wants us
* to have it.
*/
if (eventPtr->xcrossing.focus &&
(displayFocusPtr->focusWinPtr == NULL)
&& !(winPtr->flags & TK_EMBEDDED)) {
if (tclFocusDebug) {
printf("Focussed implicitly on %s\n",
newFocusPtr->pathName);
}
GenerateFocusEvents(displayFocusPtr->focusWinPtr, newFocusPtr);
displayFocusPtr->focusWinPtr = newFocusPtr;
dispPtr->implicitWinPtr = winPtr;
dispPtr->focusPtr = newFocusPtr;
}
} else if (eventPtr->type == LeaveNotify) {
/*
* If the pointer just left a window for which we automatically
* claimed the focus on enter, move the focus back to the root
* window, where it was before we claimed it above. Note:
* dispPtr->implicitWinPtr may not be the same as
* displayFocusPtr->focusWinPtr (e.g. because the "focus"
* command was used to redirect the focus after it arrived at
* dispPtr->implicitWinPtr)!! In addition, we generate events
* because the window manager won't give us a FocusOut event when
* we focus on the root.
*/
if ((dispPtr->implicitWinPtr != NULL)
&& !(winPtr->flags & TK_EMBEDDED)) {
if (tclFocusDebug) {
printf("Defocussed implicit Async\n");
}
GenerateFocusEvents(displayFocusPtr->focusWinPtr,
(TkWindow *) NULL);
XSetInputFocus(dispPtr->display, PointerRoot, RevertToPointerRoot,
CurrentTime);
displayFocusPtr->focusWinPtr = NULL;
dispPtr->implicitWinPtr = NULL;
}
}
return retValue;
}
/*
*----------------------------------------------------------------------
*
* SetFocus --
*
* This procedure is invoked to change the focus window for a
* given display in a given application.
*
* Results:
* None.
*
* Side effects:
* Event handlers may be invoked to process the change of
* focus.
*
*----------------------------------------------------------------------
*/
static void
SetFocus(winPtr, force)
TkWindow *winPtr; /* Window that is to be the new focus for
* its display and application. */
int force; /* If non-zero, set the X focus to this
* window even if the application doesn't
* currently have the X focus. */
{
ToplevelFocusInfo *tlFocusPtr;
DisplayFocusInfo *displayFocusPtr;
TkWindow *topLevelPtr;
int allMapped, serial;
displayFocusPtr = FindDisplayFocusInfo(winPtr->mainPtr, winPtr->dispPtr);
if (winPtr == displayFocusPtr->focusWinPtr) {
return;
}
/*
* Find the top-level window for winPtr, then find (or create)
* a record for the top-level. Also see whether winPtr and all its
* ancestors are mapped.
*/
allMapped = 1;
for (topLevelPtr = winPtr; ; topLevelPtr = topLevelPtr->parentPtr) {
if (topLevelPtr == NULL) {
/*
* The window is being deleted. No point in worrying about
* giving it the focus.
*/
return;
}
if (!(topLevelPtr->flags & TK_MAPPED)) {
allMapped = 0;
}
if (topLevelPtr->flags & TK_TOP_LEVEL) {
break;
}
}
/*
* If the new focus window isn't mapped, then we can't focus on it
* (X will generate an error, for example). Instead, create an
* event handler that will set the focus to this window once it gets
* mapped. At the same time, delete any old handler that might be
* around; it's no longer relevant.
*/
if (displayFocusPtr->focusOnMapPtr != NULL) {
Tk_DeleteEventHandler(
(Tk_Window) displayFocusPtr->focusOnMapPtr,
StructureNotifyMask, FocusMapProc,
(ClientData) displayFocusPtr->focusOnMapPtr);
displayFocusPtr->focusOnMapPtr = NULL;
}
if (!allMapped) {
Tk_CreateEventHandler((Tk_Window) winPtr,
VisibilityChangeMask, FocusMapProc,
(ClientData) winPtr);
displayFocusPtr->focusOnMapPtr = winPtr;
displayFocusPtr->forceFocus = force;
return;
}
for (tlFocusPtr = winPtr->mainPtr->tlFocusPtr; tlFocusPtr != NULL;
tlFocusPtr = tlFocusPtr->nextPtr) {
if (tlFocusPtr->topLevelPtr == topLevelPtr) {
break;
}
}
if (tlFocusPtr == NULL) {
tlFocusPtr = (ToplevelFocusInfo *) ckalloc(sizeof(ToplevelFocusInfo));
tlFocusPtr->topLevelPtr = topLevelPtr;
tlFocusPtr->nextPtr = winPtr->mainPtr->tlFocusPtr;
winPtr->mainPtr->tlFocusPtr = tlFocusPtr;
}
tlFocusPtr->focusWinPtr = winPtr;
/*
* Reset the window system's focus window and generate focus events,
* with two special cases:
*
* 1. If the application is embedded and doesn't currently have the
* focus, don't set the focus directly. Instead, see if the
* embedding code can claim the focus from the enclosing
* container.
* 2. Otherwise, if the application doesn't currently have the
* focus, don't change the window system's focus unless it was
* already in this application or "force" was specified.
*/
if ((topLevelPtr->flags & TK_EMBEDDED)
&& (displayFocusPtr->focusWinPtr == NULL)) {
TkpClaimFocus(topLevelPtr, force);
} else if ((displayFocusPtr->focusWinPtr != NULL) || force) {
/*
* Generate events to shift focus between Tk windows.
* We do this regardless of what TkpChangeFocus does with
* the real X focus so that Tk widgets track focus commands
* when there is no window manager. GenerateFocusEvents will
* set up a serial number marker so we discard focus events
* that are triggered by the ChangeFocus.
*/
serial = TkpChangeFocus(TkpGetWrapperWindow(topLevelPtr), force);
if (serial != 0) {
displayFocusPtr->focusSerial = serial;
}
GenerateFocusEvents(displayFocusPtr->focusWinPtr, winPtr);
displayFocusPtr->focusWinPtr = winPtr;
winPtr->dispPtr->focusPtr = winPtr;
}
}
/*
*----------------------------------------------------------------------
*
* TkGetFocusWin --
*
* Given a window, this procedure returns the current focus
* window for its application and display.
*
* Results:
* The return value is a pointer to the window that currently
* has the input focus for the specified application and
* display, or NULL if none.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
TkWindow *
TkGetFocusWin(winPtr)
TkWindow *winPtr; /* Window that selects an application
* and a display. */
{
DisplayFocusInfo *displayFocusPtr;
if (winPtr == NULL) {
return (TkWindow *) NULL;
}
displayFocusPtr = FindDisplayFocusInfo(winPtr->mainPtr, winPtr->dispPtr);
return displayFocusPtr->focusWinPtr;
}
/*
*----------------------------------------------------------------------
*
* TkFocusKeyEvent --
*
* Given a window and a key press or release event that arrived for
* the window, use information about the keyboard focus to compute
* which window should really get the event. In addition, update
* the event to refer to its new window.
*
* Results:
* The return value is a pointer to the window that has the input
* focus in winPtr's application, or NULL if winPtr's application
* doesn't have the input focus. If a non-NULL value is returned,
* eventPtr will be updated to refer properly to the focus window.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
TkWindow *
TkFocusKeyEvent(winPtr, eventPtr)
TkWindow *winPtr; /* Window that selects an application
* and a display. */
XEvent *eventPtr; /* X event to redirect (should be KeyPress
* or KeyRelease). */
{
DisplayFocusInfo *displayFocusPtr;
TkWindow *focusWinPtr;
int focusX, focusY, vRootX, vRootY, vRootWidth, vRootHeight;
displayFocusPtr = FindDisplayFocusInfo(winPtr->mainPtr, winPtr->dispPtr);
focusWinPtr = displayFocusPtr->focusWinPtr;
/*
* The code below is a debugging aid to make sure that dispPtr->focusPtr
* is kept properly in sync with the "truth", which is the value in
* displayFocusPtr->focusWinPtr.
*/
#ifdef TCL_MEM_DEBUG
if (focusWinPtr != winPtr->dispPtr->focusPtr) {
printf("TkFocusKeyEvent found dispPtr->focusPtr out of sync:\n");
printf("expected %s, got %s\n",
(focusWinPtr != NULL) ? focusWinPtr->pathName : "??",
(winPtr->dispPtr->focusPtr != NULL) ?
winPtr->dispPtr->focusPtr->pathName : "??");
}
#endif
if ((focusWinPtr != NULL) && (focusWinPtr->mainPtr == winPtr->mainPtr)) {
/*
* Map the x and y coordinates to make sense in the context of
* the focus window, if possible (make both -1 if the map-from
* and map-to windows don't share the same screen).
*/
if ((focusWinPtr->display != winPtr->display)
|| (focusWinPtr->screenNum != winPtr->screenNum)) {
eventPtr->xkey.x = -1;
eventPtr->xkey.y = -1;
} else {
Tk_GetVRootGeometry((Tk_Window) focusWinPtr, &vRootX, &vRootY,
&vRootWidth, &vRootHeight);
Tk_GetRootCoords((Tk_Window) focusWinPtr, &focusX, &focusY);
eventPtr->xkey.x = eventPtr->xkey.x_root - vRootX - focusX;
eventPtr->xkey.y = eventPtr->xkey.y_root - vRootY - focusY;
}
eventPtr->xkey.window = focusWinPtr->window;
return focusWinPtr;
}
/*
* The event doesn't belong to us. Perhaps, due to embedding, it
* really belongs to someone else. Give the embedding code a chance
* to redirect the event.
*/
TkpRedirectKeyEvent(winPtr, eventPtr);
return (TkWindow *) NULL;
}
/*
*----------------------------------------------------------------------
*
* TkFocusDeadWindow --
*
* This procedure is invoked when it is determined that
* a window is dead. It cleans up focus-related information
* about the window.
*
* Results:
* None.
*
* Side effects:
* Various things get cleaned up and recycled.
*
*----------------------------------------------------------------------
*/
void
TkFocusDeadWindow(winPtr)
register TkWindow *winPtr; /* Information about the window
* that is being deleted. */
{
ToplevelFocusInfo *tlFocusPtr, *prevPtr;
DisplayFocusInfo *displayFocusPtr;
TkDisplay *dispPtr = winPtr->dispPtr;
/*
* Search for focus records that refer to this window either as
* the top-level window or the current focus window.
*/
displayFocusPtr = FindDisplayFocusInfo(winPtr->mainPtr, winPtr->dispPtr);
for (prevPtr = NULL, tlFocusPtr = winPtr->mainPtr->tlFocusPtr;
tlFocusPtr != NULL;
prevPtr = tlFocusPtr, tlFocusPtr = tlFocusPtr->nextPtr) {
if (winPtr == tlFocusPtr->topLevelPtr) {
/*
* The top-level window is the one being deleted: free
* the focus record and release the focus back to PointerRoot
* if we acquired it implicitly.
*/
if (dispPtr->implicitWinPtr == winPtr) {
if (tclFocusDebug) {
printf("releasing focus to root after %s died\n",
tlFocusPtr->topLevelPtr->pathName);
}
dispPtr->implicitWinPtr = NULL;
displayFocusPtr->focusWinPtr = NULL;
dispPtr->focusPtr = NULL;
}
if (displayFocusPtr->focusWinPtr == tlFocusPtr->focusWinPtr) {
displayFocusPtr->focusWinPtr = NULL;
dispPtr->focusPtr = NULL;
}
if (prevPtr == NULL) {
winPtr->mainPtr->tlFocusPtr = tlFocusPtr->nextPtr;
} else {
prevPtr->nextPtr = tlFocusPtr->nextPtr;
}
ckfree((char *) tlFocusPtr);
break;
} else if (winPtr == tlFocusPtr->focusWinPtr) {
/*
* The deleted window had the focus for its top-level:
* move the focus to the top-level itself.
*/
tlFocusPtr->focusWinPtr = tlFocusPtr->topLevelPtr;
if ((displayFocusPtr->focusWinPtr == winPtr)
&& !(tlFocusPtr->topLevelPtr->flags & TK_ALREADY_DEAD)) {
if (tclFocusDebug) {
printf("forwarding focus to %s after %s died\n",
tlFocusPtr->topLevelPtr->pathName,
winPtr->pathName);
}
GenerateFocusEvents(displayFocusPtr->focusWinPtr,
tlFocusPtr->topLevelPtr);
displayFocusPtr->focusWinPtr = tlFocusPtr->topLevelPtr;
dispPtr->focusPtr = tlFocusPtr->topLevelPtr;
}
break;
}
}
if (displayFocusPtr->focusOnMapPtr == winPtr) {
displayFocusPtr->focusOnMapPtr = NULL;
}
}
/*
*----------------------------------------------------------------------
*
* GenerateFocusEvents --
*
* This procedure is called to create FocusIn and FocusOut events to
* move the input focus from one window to another.
*
* Results:
* None.
*
* Side effects:
* FocusIn and FocusOut events are generated.
*
*----------------------------------------------------------------------
*/
static void
GenerateFocusEvents(sourcePtr, destPtr)
TkWindow *sourcePtr; /* Window that used to have the focus (may
* be NULL). */
TkWindow *destPtr; /* New window to have the focus (may be
* NULL). */
{
XEvent event;
TkWindow *winPtr;
winPtr = sourcePtr;
if (winPtr == NULL) {
winPtr = destPtr;
if (winPtr == NULL) {
return;
}
}
event.xfocus.serial = LastKnownRequestProcessed(winPtr->display);
event.xfocus.send_event = GENERATED_EVENT_MAGIC;
event.xfocus.display = winPtr->display;
event.xfocus.mode = NotifyNormal;
TkInOutEvents(&event, sourcePtr, destPtr, FocusOut, FocusIn,
TCL_QUEUE_MARK);
}
/*
*----------------------------------------------------------------------
*
* FocusMapProc --
*
* This procedure is called as an event handler for VisibilityNotify
* events, if a window receives the focus at a time when its
* toplevel isn't mapped. The procedure is needed because X
* won't allow the focus to be set to an unmapped window; we
* detect when the toplevel is mapped and set the focus to it then.
*
* Results:
* None.
*
* Side effects:
* If this is a map event, the focus gets set to the toplevel
* given by clientData.
*
*----------------------------------------------------------------------
*/
static void
FocusMapProc(clientData, eventPtr)
ClientData clientData; /* Toplevel window. */
XEvent *eventPtr; /* Information about event. */
{
TkWindow *winPtr = (TkWindow *) clientData;
DisplayFocusInfo *displayFocusPtr;
if (eventPtr->type == VisibilityNotify) {
displayFocusPtr = FindDisplayFocusInfo(winPtr->mainPtr,
winPtr->dispPtr);
if (tclFocusDebug) {
printf("auto-focussing on %s, force %d\n", winPtr->pathName,
displayFocusPtr->forceFocus);
}
Tk_DeleteEventHandler((Tk_Window) winPtr, VisibilityChangeMask,
FocusMapProc, clientData);
displayFocusPtr->focusOnMapPtr = NULL;
SetFocus(winPtr, displayFocusPtr->forceFocus);
}
}
/*
*----------------------------------------------------------------------
*
* FindDisplayFocusInfo --
*
* Given an application and a display, this procedure locate the
* focus record for that combination. If no such record exists,
* it creates a new record and initializes it.
*
* Results:
* The return value is a pointer to the record.
*
* Side effects:
* A new record will be allocated if there wasn't one already.
*
*----------------------------------------------------------------------
*/
static DisplayFocusInfo *
FindDisplayFocusInfo(mainPtr, dispPtr)
TkMainInfo *mainPtr; /* Record that identifies a particular
* application. */
TkDisplay *dispPtr; /* Display whose focus information is
* needed. */
{
DisplayFocusInfo *displayFocusPtr;
for (displayFocusPtr = mainPtr->displayFocusPtr;
displayFocusPtr != NULL;
displayFocusPtr = displayFocusPtr->nextPtr) {
if (displayFocusPtr->dispPtr == dispPtr) {
return displayFocusPtr;
}
}
/*
* The record doesn't exist yet. Make a new one.
*/
displayFocusPtr = (DisplayFocusInfo *) ckalloc(sizeof(DisplayFocusInfo));
displayFocusPtr->dispPtr = dispPtr;
displayFocusPtr->focusWinPtr = NULL;
displayFocusPtr->focusOnMapPtr = NULL;
displayFocusPtr->forceFocus = 0;
displayFocusPtr->focusSerial = 0;
displayFocusPtr->nextPtr = mainPtr->displayFocusPtr;
mainPtr->displayFocusPtr = displayFocusPtr;
return displayFocusPtr;
}
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