tkGeometry.c
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- /*
- * 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 1.5 2001/09/26 20:25:17 pspjuth Exp $
- */
- #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;
- /*
- * 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_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(tkwin, left, right, top, bottom)
- Tk_Window tkwin; /* Window that will have internal border. */
- int left, right; /* Width of internal border, in pixels. */
- int top, 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(tkwin, width)
- 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(tkwin, minWidth, minHeight)
- Tk_Window tkwin; /* Window that will have internal border. */
- int minWidth, 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(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;
- 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, &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, StructureNotifyMask, 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, StructureNotifyMask,
- 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 ((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(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;
- 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 = (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, StructureNotifyMask,
- MaintainSlaveProc, (ClientData) slavePtr);
- ckfree((char *) slavePtr);
- if (masterPtr->slavePtr == NULL) {
- if (masterPtr->ancestor != NULL) {
- for (ancestor = master; ; ancestor = Tk_Parent(ancestor)) {
- Tk_DeleteEventHandler(ancestor, StructureNotifyMask,
- 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 == ConfigureNotify)
- || (eventPtr->type == MapNotify)
- || (eventPtr->type == UnmapNotify)) {
- if (!masterPtr->checkScheduled) {
- masterPtr->checkScheduled = 1;
- Tcl_DoWhenIdle(MaintainCheckProc, (ClientData) 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, eventPtr)
- ClientData clientData; /* Pointer to MaintainSlave structure
- * for master-slave pair. */
- XEvent *eventPtr; /* Describes what just happened. */
- {
- MaintainSlave *slavePtr = (MaintainSlave *) 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 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 ((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;
- }
- }
- }