/*
* tkGeometry.c (CTk) --
*
* This file contains generic Tk code for geometry management
* (stuff that's used by all geometry managers).
*
* Copyright (c) 1990-1994 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
* Copyright (c) 1995 Cleveland Clinic Foundation
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* @(#) $Id: ctk.shar,v 1.50 1996/01/15 14:47:16 andrewm Exp andrewm $
*/
#include "tkPort.h"
#include "tkInt.h"
/*
* Data structures of the following type are used by Tk_MaintainGeometry.
* For each slave managed by Tk_MaintainGeometry, there is one of these
* structures associated with its master.
*/
typedef struct MaintainSlave {
Tk_Window slave; /* The slave window being positioned. */
Tk_Window master; /* The master that determines slave's
* position; it must be a descendant of
* slave's parent. */
int x, y; /* Desired position of slave relative to
* master. */
int width, height; /* Desired dimensions of slave. */
struct MaintainSlave *nextPtr;
/* Next in list of Maintains associated
* with master. */
} MaintainSlave;
/*
* For each window that has been specified as a master to
* Tk_MaintainGeometry, there is a structure of the following type:
*/
typedef struct MaintainMaster {
Tk_Window ancestor; /* The lowest ancestor of this window
* for which we have *not* created a
* StructureNotify handler. May be the
* same as the window itself. */
int checkScheduled; /* Non-zero means that there is already a
* call to MaintainCheckProc scheduled as
* an idle handler. */
MaintainSlave *slavePtr; /* First in list of all slaves associated
* with this master. */
} MaintainMaster;
/*
* Hash table that maps from a master's Tk_Window token to a list of
* Maintains for that master:
*/
static Tcl_HashTable maintainHashTable;
/*
* Has maintainHashTable been initialized yet?
*/
static int initialized = 0;
/*
* Prototypes for static procedures in this file:
*/
static void MaintainCheckProc _ANSI_ARGS_((ClientData clientData));
static void MaintainMasterProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static void MaintainSlaveProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
/*
*--------------------------------------------------------------
*
* Tk_ManageGeometry --
*
* Arrange for a particular procedure to manage the geometry
* of a given slave window.
*
* Results:
* None.
*
* Side effects:
* Proc becomes the new geometry manager for tkwin, replacing
* any previous geometry manager. The geometry manager will
* be notified (by calling procedures in *mgrPtr) when interesting
* things happen in the future. If there was an existing geometry
* manager for tkwin different from the new one, it is notified
* by calling its lostSlaveProc.
*
*--------------------------------------------------------------
*/
void
Tk_ManageGeometry(tkwin, mgrPtr, clientData)
Tk_Window tkwin; /* Window whose geometry is to
* be managed by proc. */
Tk_GeomMgr *mgrPtr; /* Static structure describing the
* geometry manager. This structure
* must never go away. */
ClientData clientData; /* Arbitrary one-word argument to
* pass to geometry manager procedures. */
{
register TkWindow *winPtr = (TkWindow *) tkwin;
if ((winPtr->geomMgrPtr != NULL) && (mgrPtr != NULL)
&& ((winPtr->geomMgrPtr != mgrPtr)
|| (winPtr->geomData != clientData))
&& (winPtr->geomMgrPtr->lostSlaveProc != NULL)) {
(*winPtr->geomMgrPtr->lostSlaveProc)(winPtr->geomData, tkwin);
}
winPtr->geomMgrPtr = mgrPtr;
winPtr->geomData = clientData;
}
/*
*--------------------------------------------------------------
*
* Tk_GeometryRequest --
*
* This procedure is invoked by widget code to indicate
* its preferences about the size of a window it manages.
* In general, widget code should call this procedure
* rather than Tk_ResizeWindow.
*
* Results:
* None.
*
* Side effects:
* The geometry manager for tkwin (if any) is invoked to
* handle the request. If possible, it will reconfigure
* tkwin and/or other windows to satisfy the request. The
* caller gets no indication of success or failure, but it
* will get X events if the window size was actually
* changed.
*
*--------------------------------------------------------------
*/
void
Tk_GeometryRequest(tkwin, reqWidth, reqHeight)
Tk_Window tkwin; /* Window that geometry information
* pertains to. */
int reqWidth, reqHeight; /* Minimum desired dimensions for
* window, in pixels. */
{
register TkWindow *winPtr = (TkWindow *) tkwin;
/*
* X gets very upset if a window requests a width or height of
* zero, so rounds requested sizes up to at least 1.
*/
if (reqWidth <= 0) {
reqWidth = 1;
}
if (reqHeight <= 0) {
reqHeight = 1;
}
if ((reqWidth == winPtr->reqWidth) && (reqHeight == winPtr->reqHeight)) {
return;
}
winPtr->reqWidth = reqWidth;
winPtr->reqHeight = reqHeight;
if ((winPtr->geomMgrPtr != NULL)
&& (winPtr->geomMgrPtr->requestProc != NULL)) {
(*winPtr->geomMgrPtr->requestProc)(winPtr->geomData, tkwin);
}
}
/*
*----------------------------------------------------------------------
*
* Tk_MaintainGeometry --
*
* This procedure is invoked by geometry managers to handle slaves
* whose master's are not their parents. It translates the desired
* geometry for the slave into the coordinate system of the parent
* and respositions the slave if it isn't already at the right place.
* Furthermore, it sets up event handlers so that if the master (or
* any of its ancestors up to the slave's parent) is mapped, unmapped,
* or moved, then the slave will be adjusted to match.
*
* Results:
* None.
*
* Side effects:
* Event handlers are created and state is allocated to keep track
* of slave. Note: if slave was already managed for master by
* Tk_MaintainGeometry, then the previous information is replaced
* with the new information. The caller must eventually call
* Tk_UnmaintainGeometry to eliminate the correspondence (or, the
* state is automatically freed when either window is destroyed).
*
*----------------------------------------------------------------------
*/
void
Tk_MaintainGeometry(slave, master, x, y, width, height)
Tk_Window slave; /* Slave for geometry management. */
Tk_Window master; /* Master for slave; must be a descendant
* of slave's parent. */
int x, y; /* Desired position of slave within master. */
int width, height; /* Desired dimensions for slave. */
{
Tcl_HashEntry *hPtr;
MaintainMaster *masterPtr;
register MaintainSlave *slavePtr;
int new, map;
Tk_Window ancestor, parent;
if (!initialized) {
initialized = 1;
Tcl_InitHashTable(&maintainHashTable, TCL_ONE_WORD_KEYS);
}
/*
* See if there is already a MaintainMaster structure for the master;
* if not, then create one.
*/
parent = Tk_Parent(slave);
hPtr = Tcl_CreateHashEntry(&maintainHashTable, (char *) master, &new);
if (!new) {
masterPtr = (MaintainMaster *) Tcl_GetHashValue(hPtr);
} else {
masterPtr = (MaintainMaster *) ckalloc(sizeof(MaintainMaster));
masterPtr->ancestor = master;
masterPtr->checkScheduled = 0;
masterPtr->slavePtr = NULL;
Tcl_SetHashValue(hPtr, masterPtr);
}
/*
* Create a MaintainSlave structure for the slave if there isn't
* already one.
*/
for (slavePtr = masterPtr->slavePtr; slavePtr != NULL;
slavePtr = slavePtr->nextPtr) {
if (slavePtr->slave == slave) {
goto gotSlave;
}
}
slavePtr = (MaintainSlave *) ckalloc(sizeof(MaintainSlave));
slavePtr->slave = slave;
slavePtr->master = master;
slavePtr->nextPtr = masterPtr->slavePtr;
masterPtr->slavePtr = slavePtr;
Tk_CreateEventHandler(slave, CTK_DESTROY_EVENT_MASK, MaintainSlaveProc,
(ClientData) slavePtr);
/*
* Make sure that there are event handlers registered for all
* the windows between master and slave's parent (including master
* but not slave's parent). There may already be handlers for master
* and some of its ancestors (masterPtr->ancestor tells how many).
*/
for (ancestor = master; ancestor != parent;
ancestor = Tk_Parent(ancestor)) {
if (ancestor == masterPtr->ancestor) {
Tk_CreateEventHandler(ancestor,
CTK_MAP_EVENT_MASK|CTK_DESTROY_EVENT_MASK,
MaintainMasterProc, (ClientData) masterPtr);
masterPtr->ancestor = Tk_Parent(ancestor);
}
}
/*
* Fill in up-to-date information in the structure, then update the
* window if it's not currently in the right place or state.
*/
gotSlave:
slavePtr->x = x;
slavePtr->y = y;
slavePtr->width = width;
slavePtr->height = height;
map = 1;
for (ancestor = slavePtr->master; ; ancestor = Tk_Parent(ancestor)) {
if (!Tk_IsMapped(ancestor) && (ancestor != parent)) {
map = 0;
}
if (ancestor == parent) {
if (map) {
if (!Tk_IsMapped(slavePtr->slave)
|| (x != Tk_X(slavePtr->slave))
|| (y != Tk_Y(slavePtr->slave))
|| (width != Tk_Width(slavePtr->slave))
|| (height != Tk_Height(slavePtr->slave))) {
Ctk_Map(slavePtr->slave, x, y, x + width, y + height);
}
} else {
Tk_UnmapWindow(slavePtr->slave);
}
break;
}
x += Tk_X(ancestor);
y += Tk_Y(ancestor);
}
}
/*
*----------------------------------------------------------------------
*
* Tk_UnmaintainGeometry --
*
* This procedure cancels a previous Tk_MaintainGeometry call,
* so that the relationship between slave and master is no longer
* maintained.
*
* Results:
* None.
*
* Side effects:
* The slave is unmapped and state is released, so that slave won't
* track master any more. If we weren't previously managing slave
* relative to master, then this procedure has no effect.
*
*----------------------------------------------------------------------
*/
void
Tk_UnmaintainGeometry(slave, master)
Tk_Window slave; /* Slave for geometry management. */
Tk_Window master; /* Master for slave; must be a descendant
* of slave's parent. */
{
Tcl_HashEntry *hPtr;
MaintainMaster *masterPtr;
register MaintainSlave *slavePtr, *prevPtr;
Tk_Window ancestor;
if (!initialized) {
initialized = 1;
Tcl_InitHashTable(&maintainHashTable, TCL_ONE_WORD_KEYS);
}
if (!(((TkWindow *) slave)->flags & TK_ALREADY_DEAD)) {
Tk_UnmapWindow(slave);
}
hPtr = Tcl_FindHashEntry(&maintainHashTable, (char *) master);
if (hPtr == NULL) {
return;
}
masterPtr = (MaintainMaster *) Tcl_GetHashValue(hPtr);
slavePtr = masterPtr->slavePtr;
if (slavePtr->slave == slave) {
masterPtr->slavePtr = slavePtr->nextPtr;
} else {
for (prevPtr = slavePtr, slavePtr = slavePtr->nextPtr; ;
prevPtr = slavePtr, slavePtr = slavePtr->nextPtr) {
if (slavePtr == NULL) {
return;
}
if (slavePtr->slave == slave) {
prevPtr->nextPtr = slavePtr->nextPtr;
break;
}
}
}
Tk_DeleteEventHandler(slavePtr->slave, CTK_DESTROY_EVENT_MASK,
MaintainSlaveProc, (ClientData) slavePtr);
ckfree((char *) slavePtr);
if (masterPtr->slavePtr == NULL) {
if (masterPtr->ancestor != NULL) {
for (ancestor = master; ; ancestor = Tk_Parent(ancestor)) {
Tk_DeleteEventHandler(ancestor,
CTK_MAP_EVENT_MASK|CTK_DESTROY_EVENT_MASK,
MaintainMasterProc, (ClientData) masterPtr);
if (ancestor == masterPtr->ancestor) {
break;
}
}
}
if (masterPtr->checkScheduled) {
Tcl_CancelIdleCall(MaintainCheckProc, (ClientData) masterPtr);
}
Tcl_DeleteHashEntry(hPtr);
ckfree((char *) masterPtr);
}
}
/*
*----------------------------------------------------------------------
*
* MaintainMasterProc --
*
* This procedure is invoked by the Tk event dispatcher in
* response to StructureNotify events on the master or one
* of its ancestors, on behalf of Tk_MaintainGeometry.
*
* Results:
* None.
*
* Side effects:
* It schedules a call to MaintainCheckProc, which will eventually
* caused the postions and mapped states to be recalculated for all
* the maintained slaves of the master. Or, if the master window is
* being deleted then state is cleaned up.
*
*----------------------------------------------------------------------
*/
static void
MaintainMasterProc(clientData, eventPtr)
ClientData clientData; /* Pointer to MaintainMaster structure
* for the master window. */
XEvent *eventPtr; /* Describes what just happened. */
{
MaintainMaster *masterPtr = (MaintainMaster *) clientData;
MaintainSlave *slavePtr;
int done;
if ((eventPtr->type == CTK_MAP_EVENT)
|| (eventPtr->type == CTK_UNMAP_EVENT)) {
if (!masterPtr->checkScheduled) {
masterPtr->checkScheduled = 1;
Tcl_DoWhenIdle(MaintainCheckProc, (ClientData) masterPtr);
}
} else if (eventPtr->type == CTK_DESTROY_EVENT) {
/*
* Delete all of the state associated with this master, but
* be careful not to use masterPtr after the last slave is
* deleted, since its memory will have been freed.
*/
done = 0;
do {
slavePtr = masterPtr->slavePtr;
if (slavePtr->nextPtr == NULL) {
done = 1;
}
Tk_UnmaintainGeometry(slavePtr->slave, slavePtr->master);
} while (!done);
}
}
/*
*----------------------------------------------------------------------
*
* MaintainSlaveProc --
*
* This procedure is invoked by the Tk event dispatcher in
* response to StructureNotify events on a slave being managed
* by Tk_MaintainGeometry.
*
* Results:
* None.
*
* Side effects:
* If the event is a DestroyNotify event then the Maintain state
* and event handlers for this slave are deleted.
*
*----------------------------------------------------------------------
*/
static void
MaintainSlaveProc(clientData, eventPtr)
ClientData clientData; /* Pointer to MaintainSlave structure
* for master-slave pair. */
XEvent *eventPtr; /* Describes what just happened. */
{
MaintainSlave *slavePtr = (MaintainSlave *) clientData;
if (eventPtr->type == CTK_DESTROY_EVENT) {
Tk_UnmaintainGeometry(slavePtr->slave, slavePtr->master);
}
}
/*
*----------------------------------------------------------------------
*
* MaintainCheckProc --
*
* This procedure is invoked by the Tk event dispatcher as an
* idle handler, when a master or one of its ancestors has been
* reconfigured, mapped, or unmapped. Its job is to scan all of
* the slaves for the master and reposition them, map them, or
* unmap them as needed to maintain their geometry relative to
* the master.
*
* Results:
* None.
*
* Side effects:
* Slaves can get repositioned, mapped, or unmapped.
*
*----------------------------------------------------------------------
*/
static void
MaintainCheckProc(clientData)
ClientData clientData; /* Pointer to MaintainMaster structure
* for the master window. */
{
MaintainMaster *masterPtr = (MaintainMaster *) clientData;
MaintainSlave *slavePtr;
Tk_Window ancestor, parent;
int x, y, map;
masterPtr->checkScheduled = 0;
for (slavePtr = masterPtr->slavePtr; slavePtr != NULL;
slavePtr = slavePtr->nextPtr) {
parent = Tk_Parent(slavePtr->slave);
x = slavePtr->x;
y = slavePtr->y;
map = 1;
for (ancestor = slavePtr->master; ; ancestor = Tk_Parent(ancestor)) {
if (!Tk_IsMapped(ancestor) && (ancestor != parent)) {
map = 0;
}
if (ancestor == parent) {
if (map) {
if (!Tk_IsMapped(slavePtr->slave)
|| (x != Tk_X(slavePtr->slave))
|| (y != Tk_Y(slavePtr->slave))) {
Ctk_Map(slavePtr->slave, x, y,
x + Tk_Width(slavePtr->slave),
y + Tk_Height(slavePtr->slave));
}
} else {
Tk_UnmapWindow(slavePtr->slave);
}
break;
}
x += Tk_X(ancestor);
y += Tk_Y(ancestor);
}
}
}