/*
* tkGeometry.c --
*
* 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.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkGeometry.c,v 1.13 2008/04/27 22:38:56 dkf Exp $
*/
#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;
/*
* Prototypes for static procedures in this file:
*/
static void MaintainCheckProc(ClientData clientData);
static void MaintainMasterProc(ClientData clientData,
XEvent *eventPtr);
static void MaintainSlaveProc(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(
Tk_Window tkwin, /* Window whose geometry is to be managed by
* proc. */
const 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(
Tk_Window tkwin, /* Window that geometry information pertains
* to. */
int reqWidth, int 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_SetInternalBorderEx --
*
* Notify relevant geometry managers that a window has an internal border
* of a given width and that child windows should not be placed on that
* border.
*
* Results:
* None.
*
* Side effects:
* The border widths are recorded for the window, and all geometry
* managers of all children are notified so that can re-layout, if
* necessary.
*
*----------------------------------------------------------------------
*/
void
Tk_SetInternalBorderEx(
Tk_Window tkwin, /* Window that will have internal border. */
int left, int right, /* Width of internal border, in pixels. */
int top, int bottom)
{
register TkWindow *winPtr = (TkWindow *) tkwin;
register int changed = 0;
if (left < 0) {
left = 0;
}
if (left != winPtr->internalBorderLeft) {
winPtr->internalBorderLeft = left;
changed = 1;
}
if (right < 0) {
right = 0;
}
if (right != winPtr->internalBorderRight) {
winPtr->internalBorderRight = right;
changed = 1;
}
if (top < 0) {
top = 0;
}
if (top != winPtr->internalBorderTop) {
winPtr->internalBorderTop = top;
changed = 1;
}
if (bottom < 0) {
bottom = 0;
}
if (bottom != winPtr->internalBorderBottom) {
winPtr->internalBorderBottom = bottom;
changed = 1;
}
/*
* All the slaves for which this is the master window must now be
* repositioned to take account of the new internal border width. To
* signal all the geometry managers to do this, just resize the window to
* its current size. The ConfigureNotify event will cause geometry
* managers to recompute everything.
*/
if (changed) {
Tk_ResizeWindow(tkwin, Tk_Width(tkwin), Tk_Height(tkwin));
}
}
/*
*----------------------------------------------------------------------
*
* Tk_SetInternalBorder --
*
* Notify relevant geometry managers that a window has an internal border
* of a given width and that child windows should not be placed on that
* border.
*
* Results:
* None.
*
* Side effects:
* The border width is recorded for the window, and all geometry managers
* of all children are notified so that can re-layout, if necessary.
*
*----------------------------------------------------------------------
*/
void
Tk_SetInternalBorder(
Tk_Window tkwin, /* Window that will have internal border. */
int width) /* Width of internal border, in pixels. */
{
Tk_SetInternalBorderEx(tkwin, width, width, width, width);
}
/*
*----------------------------------------------------------------------
*
* Tk_SetMinimumRequestSize --
*
* Notify relevant geometry managers that a window has a minimum request
* size.
*
* Results:
* None.
*
* Side effects:
* The minimum request size is recorded for the window, and a new size is
* requested for the window, if necessary.
*
*----------------------------------------------------------------------
*/
void
Tk_SetMinimumRequestSize(
Tk_Window tkwin, /* Window that will have internal border. */
int minWidth, int minHeight)/* Minimum requested size, in pixels. */
{
register TkWindow *winPtr = (TkWindow *) tkwin;
if ((winPtr->minReqWidth == minWidth) &&
(winPtr->minReqHeight == minHeight)) {
return;
}
winPtr->minReqWidth = minWidth;
winPtr->minReqHeight = minHeight;
/*
* The changed min size may cause geometry managers to get a different
* result, so make them recompute. To signal all the geometry managers to
* do this, just resize the window to its current size. The
* ConfigureNotify event will cause geometry managers to recompute
* everything.
*/
Tk_ResizeWindow(tkwin, Tk_Width(tkwin), Tk_Height(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(
Tk_Window slave, /* Slave for geometry management. */
Tk_Window master, /* Master for slave; must be a descendant of
* slave's parent. */
int x, int y, /* Desired position of slave within master. */
int width, int height) /* Desired dimensions for slave. */
{
Tcl_HashEntry *hPtr;
MaintainMaster *masterPtr;
register MaintainSlave *slavePtr;
int isNew, map;
Tk_Window ancestor, parent;
TkDisplay *dispPtr = ((TkWindow *) master)->dispPtr;
if (master == Tk_Parent(slave)) {
/*
* If the slave is a direct descendant of the master, don't bother
* setting up the extra infrastructure for management, just make a
* call to Tk_MoveResizeWindow; the parent/child relationship will
* take care of the rest.
*/
Tk_MoveResizeWindow(slave, x, y, width, height);
/*
* Map the slave if the master is already mapped; otherwise, wait
* until the master is mapped later (in which case mapping the slave
* is taken care of elsewhere).
*/
if (Tk_IsMapped(master)) {
Tk_MapWindow(slave);
}
return;
}
if (!dispPtr->geomInit) {
dispPtr->geomInit = 1;
Tcl_InitHashTable(&dispPtr->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(&dispPtr->maintainHashTable,
(char *) master, &isNew);
if (!isNew) {
masterPtr = 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, StructureNotifyMask, MaintainSlaveProc,
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, StructureNotifyMask,
MaintainMasterProc, 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 ((x != Tk_X(slavePtr->slave))
|| (y != Tk_Y(slavePtr->slave))
|| (width != Tk_Width(slavePtr->slave))
|| (height != Tk_Height(slavePtr->slave))) {
Tk_MoveResizeWindow(slavePtr->slave, x, y, width, height);
}
if (map) {
Tk_MapWindow(slavePtr->slave);
} else {
Tk_UnmapWindow(slavePtr->slave);
}
break;
}
x += Tk_X(ancestor) + Tk_Changes(ancestor)->border_width;
y += Tk_Y(ancestor) + Tk_Changes(ancestor)->border_width;
}
}
/*
*----------------------------------------------------------------------
*
* 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(
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;
TkDisplay *dispPtr = ((TkWindow *) slave)->dispPtr;
if (master == Tk_Parent(slave)) {
/*
* If the slave is a direct descendant of the master,
* Tk_MaintainGeometry will not have set up any of the extra
* infrastructure. Don't even bother to look for it, just return.
*/
return;
}
if (!dispPtr->geomInit) {
dispPtr->geomInit = 1;
Tcl_InitHashTable(&dispPtr->maintainHashTable, TCL_ONE_WORD_KEYS);
}
if (!(((TkWindow *) slave)->flags & TK_ALREADY_DEAD)) {
Tk_UnmapWindow(slave);
}
hPtr = Tcl_FindHashEntry(&dispPtr->maintainHashTable, (char *) master);
if (hPtr == NULL) {
return;
}
masterPtr = 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, StructureNotifyMask,
MaintainSlaveProc, slavePtr);
ckfree((char *) slavePtr);
if (masterPtr->slavePtr == NULL) {
if (masterPtr->ancestor != NULL) {
for (ancestor = master; ; ancestor = Tk_Parent(ancestor)) {
Tk_DeleteEventHandler(ancestor, StructureNotifyMask,
MaintainMasterProc, masterPtr);
if (ancestor == masterPtr->ancestor) {
break;
}
}
}
if (masterPtr->checkScheduled) {
Tcl_CancelIdleCall(MaintainCheckProc, 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 clientData, /* Pointer to MaintainMaster structure for the
* master window. */
XEvent *eventPtr) /* Describes what just happened. */
{
MaintainMaster *masterPtr = clientData;
MaintainSlave *slavePtr;
int done;
if ((eventPtr->type == ConfigureNotify)
|| (eventPtr->type == MapNotify)
|| (eventPtr->type == UnmapNotify)) {
if (!masterPtr->checkScheduled) {
masterPtr->checkScheduled = 1;
Tcl_DoWhenIdle(MaintainCheckProc, masterPtr);
}
} else if (eventPtr->type == DestroyNotify) {
/*
* 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 clientData, /* Pointer to MaintainSlave structure for
* master-slave pair. */
XEvent *eventPtr) /* Describes what just happened. */
{
MaintainSlave *slavePtr = clientData;
if (eventPtr->type == DestroyNotify) {
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) /* Pointer to MaintainMaster structure for the
* master window. */
{
MaintainMaster *masterPtr = 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 ((x != Tk_X(slavePtr->slave))
|| (y != Tk_Y(slavePtr->slave))) {
Tk_MoveWindow(slavePtr->slave, x, y);
}
if (map) {
Tk_MapWindow(slavePtr->slave);
} else {
Tk_UnmapWindow(slavePtr->slave);
}
break;
}
x += Tk_X(ancestor) + Tk_Changes(ancestor)->border_width;
y += Tk_Y(ancestor) + Tk_Changes(ancestor)->border_width;
}
}
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/