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Diffstat (limited to 'tk8.6/generic/tkGeometry.c')
| -rw-r--r-- | tk8.6/generic/tkGeometry.c | 784 |
1 files changed, 784 insertions, 0 deletions
diff --git a/tk8.6/generic/tkGeometry.c b/tk8.6/generic/tkGeometry.c new file mode 100644 index 0000000..2e0009a --- /dev/null +++ b/tk8.6/generic/tkGeometry.c @@ -0,0 +1,784 @@ +/* + * 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. + */ + +#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)); +} + +/* + *---------------------------------------------------------------------- + * + * TkSetGeometryMaster -- + * + * Set a geometry master for this window. Only one master may own + * a window at any time. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * The geometry master is recorded for the window. + * + *---------------------------------------------------------------------- + */ + +int +TkSetGeometryMaster( + Tcl_Interp *interp, /* Current interpreter, for error. */ + Tk_Window tkwin, /* Window that will have geometry master + * set. */ + const char *master) /* The master identity. */ +{ + register TkWindow *winPtr = (TkWindow *) tkwin; + + if (winPtr->geometryMaster != NULL && + strcmp(winPtr->geometryMaster, master) == 0) { + return TCL_OK; + } + if (winPtr->geometryMaster != NULL) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "cannot use geometry manager %s inside %s which already" + " has slaves managed by %s", + master, Tk_PathName(tkwin), winPtr->geometryMaster)); + Tcl_SetErrorCode(interp, "TK", "GEOMETRY", "FIGHT", NULL); + } + return TCL_ERROR; + } + + winPtr->geometryMaster = ckalloc(strlen(master) + 1); + strcpy(winPtr->geometryMaster, master); + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * TkFreeGeometryMaster -- + * + * Remove a geometry master for this window. Only one master may own + * a window at any time. + * + * Results: + * None. + * + * Side effects: + * The geometry master is cleared for the window. + * + *---------------------------------------------------------------------- + */ + +void +TkFreeGeometryMaster( + Tk_Window tkwin, /* Window that will have geometry master + * cleared. */ + const char *master) /* The master identity. */ +{ + register TkWindow *winPtr = (TkWindow *) tkwin; + + if (winPtr->geometryMaster != NULL && + strcmp(winPtr->geometryMaster, master) != 0) { + Tcl_Panic("Trying to free %s from geometry manager %s", + winPtr->geometryMaster, master); + } + if (winPtr->geometryMaster != NULL) { + ckfree(winPtr->geometryMaster); + winPtr->geometryMaster = NULL; + } +} + +/* + *---------------------------------------------------------------------- + * + * 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 = 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 = 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(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(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: + */ |