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-rw-r--r--generic/tkGeometry.c582
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diff --git a/generic/tkGeometry.c b/generic/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.
+ *
+ * SCCS: @(#) tkGeometry.c 1.31 96/02/15 18:53:32
+ */
+
+#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_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. */
+{
+ register TkWindow *winPtr = (TkWindow *) tkwin;
+
+ if (width == winPtr->internalBorderWidth) {
+ return;
+ }
+ if (width < 0) {
+ width = 0;
+ }
+ winPtr->internalBorderWidth = width;
+
+ /*
+ * 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.
+ */
+
+ 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;
+
+ 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, 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;
+
+ 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, 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;
+ }
+ }
+}
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