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author | rjohnson <rjohnson@noemail.net> | 1998-04-01 09:51:45 (GMT) |
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committer | rjohnson <rjohnson@noemail.net> | 1998-04-01 09:51:45 (GMT) |
commit | 9c5b7f2b7e472536ed2e7c915ead05e2aa264182 (patch) | |
tree | 8fb30cb152c4dc191be47fa043d2e6f5ea38c7ba /generic/tkGeometry.c | |
parent | 1d0efcbe267f2c0eb73869862522fb20fb2d63ca (diff) | |
download | tk-9c5b7f2b7e472536ed2e7c915ead05e2aa264182.zip tk-9c5b7f2b7e472536ed2e7c915ead05e2aa264182.tar.gz tk-9c5b7f2b7e472536ed2e7c915ead05e2aa264182.tar.bz2 |
Initial revision
FossilOrigin-Name: 2bf55ca9aa942b581137b9f474da5ad9c1480de4
Diffstat (limited to 'generic/tkGeometry.c')
-rw-r--r-- | generic/tkGeometry.c | 582 |
1 files changed, 582 insertions, 0 deletions
diff --git a/generic/tkGeometry.c b/generic/tkGeometry.c new file mode 100644 index 0000000..ec2c959 --- /dev/null +++ b/generic/tkGeometry.c @@ -0,0 +1,582 @@ +/* + * 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; + } + } +} |