583 lines
17 KiB
C
583 lines
17 KiB
C
/*
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* tkGeometry.c --
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*
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* This file contains generic Tk code for geometry management
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* (stuff that's used by all geometry managers).
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*
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* Copyright (c) 1990-1994 The Regents of the University of California.
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* Copyright (c) 1994-1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkGeometry.c 1.31 96/02/15 18:53:32
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*/
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#include "tkPort.h"
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#include "tkInt.h"
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/*
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* Data structures of the following type are used by Tk_MaintainGeometry.
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* For each slave managed by Tk_MaintainGeometry, there is one of these
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* structures associated with its master.
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*/
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typedef struct MaintainSlave {
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Tk_Window slave; /* The slave window being positioned. */
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Tk_Window master; /* The master that determines slave's
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* position; it must be a descendant of
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* slave's parent. */
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int x, y; /* Desired position of slave relative to
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* master. */
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int width, height; /* Desired dimensions of slave. */
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struct MaintainSlave *nextPtr;
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/* Next in list of Maintains associated
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* with master. */
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} MaintainSlave;
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/*
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* For each window that has been specified as a master to
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* Tk_MaintainGeometry, there is a structure of the following type:
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*/
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typedef struct MaintainMaster {
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Tk_Window ancestor; /* The lowest ancestor of this window
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* for which we have *not* created a
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* StructureNotify handler. May be the
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* same as the window itself. */
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int checkScheduled; /* Non-zero means that there is already a
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* call to MaintainCheckProc scheduled as
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* an idle handler. */
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MaintainSlave *slavePtr; /* First in list of all slaves associated
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* with this master. */
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} MaintainMaster;
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/*
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* Hash table that maps from a master's Tk_Window token to a list of
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* Maintains for that master:
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*/
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static Tcl_HashTable maintainHashTable;
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/*
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* Has maintainHashTable been initialized yet?
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*/
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static int initialized = 0;
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/*
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* Prototypes for static procedures in this file:
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*/
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static void MaintainCheckProc _ANSI_ARGS_((ClientData clientData));
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static void MaintainMasterProc _ANSI_ARGS_((ClientData clientData,
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XEvent *eventPtr));
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static void MaintainSlaveProc _ANSI_ARGS_((ClientData clientData,
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XEvent *eventPtr));
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/*
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*--------------------------------------------------------------
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*
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* Tk_ManageGeometry --
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*
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* Arrange for a particular procedure to manage the geometry
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* of a given slave window.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Proc becomes the new geometry manager for tkwin, replacing
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* any previous geometry manager. The geometry manager will
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* be notified (by calling procedures in *mgrPtr) when interesting
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* things happen in the future. If there was an existing geometry
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* manager for tkwin different from the new one, it is notified
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* by calling its lostSlaveProc.
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*
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*--------------------------------------------------------------
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*/
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void
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Tk_ManageGeometry(tkwin, mgrPtr, clientData)
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Tk_Window tkwin; /* Window whose geometry is to
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* be managed by proc. */
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Tk_GeomMgr *mgrPtr; /* Static structure describing the
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* geometry manager. This structure
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* must never go away. */
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ClientData clientData; /* Arbitrary one-word argument to
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* pass to geometry manager procedures. */
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{
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register TkWindow *winPtr = (TkWindow *) tkwin;
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if ((winPtr->geomMgrPtr != NULL) && (mgrPtr != NULL)
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&& ((winPtr->geomMgrPtr != mgrPtr)
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|| (winPtr->geomData != clientData))
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&& (winPtr->geomMgrPtr->lostSlaveProc != NULL)) {
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(*winPtr->geomMgrPtr->lostSlaveProc)(winPtr->geomData, tkwin);
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}
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winPtr->geomMgrPtr = mgrPtr;
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winPtr->geomData = clientData;
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}
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/*
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*--------------------------------------------------------------
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*
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* Tk_GeometryRequest --
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*
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* This procedure is invoked by widget code to indicate
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* its preferences about the size of a window it manages.
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* In general, widget code should call this procedure
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* rather than Tk_ResizeWindow.
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*
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* Results:
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* None.
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*
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* Side effects:
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* The geometry manager for tkwin (if any) is invoked to
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* handle the request. If possible, it will reconfigure
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* tkwin and/or other windows to satisfy the request. The
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* caller gets no indication of success or failure, but it
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* will get X events if the window size was actually
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* changed.
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*
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*--------------------------------------------------------------
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*/
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void
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Tk_GeometryRequest(tkwin, reqWidth, reqHeight)
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Tk_Window tkwin; /* Window that geometry information
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* pertains to. */
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int reqWidth, reqHeight; /* Minimum desired dimensions for
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* window, in pixels. */
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{
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register TkWindow *winPtr = (TkWindow *) tkwin;
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/*
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* X gets very upset if a window requests a width or height of
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* zero, so rounds requested sizes up to at least 1.
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*/
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if (reqWidth <= 0) {
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reqWidth = 1;
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}
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if (reqHeight <= 0) {
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reqHeight = 1;
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}
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if ((reqWidth == winPtr->reqWidth) && (reqHeight == winPtr->reqHeight)) {
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return;
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}
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winPtr->reqWidth = reqWidth;
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winPtr->reqHeight = reqHeight;
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if ((winPtr->geomMgrPtr != NULL)
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&& (winPtr->geomMgrPtr->requestProc != NULL)) {
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(*winPtr->geomMgrPtr->requestProc)(winPtr->geomData, tkwin);
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tk_SetInternalBorder --
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*
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* Notify relevant geometry managers that a window has an internal
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* border of a given width and that child windows should not be
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* placed on that border.
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*
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* Results:
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* None.
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*
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* Side effects:
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* The border width is recorded for the window, and all geometry
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* managers of all children are notified so that can re-layout, if
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* necessary.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tk_SetInternalBorder(tkwin, width)
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Tk_Window tkwin; /* Window that will have internal border. */
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int width; /* Width of internal border, in pixels. */
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{
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register TkWindow *winPtr = (TkWindow *) tkwin;
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if (width == winPtr->internalBorderWidth) {
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return;
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}
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if (width < 0) {
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width = 0;
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}
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winPtr->internalBorderWidth = width;
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/*
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* All the slaves for which this is the master window must now be
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* repositioned to take account of the new internal border width.
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* To signal all the geometry managers to do this, just resize the
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* window to its current size. The ConfigureNotify event will
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* cause geometry managers to recompute everything.
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*/
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Tk_ResizeWindow(tkwin, Tk_Width(tkwin), Tk_Height(tkwin));
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tk_MaintainGeometry --
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*
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* This procedure is invoked by geometry managers to handle slaves
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* whose master's are not their parents. It translates the desired
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* geometry for the slave into the coordinate system of the parent
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* and respositions the slave if it isn't already at the right place.
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* Furthermore, it sets up event handlers so that if the master (or
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* any of its ancestors up to the slave's parent) is mapped, unmapped,
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* or moved, then the slave will be adjusted to match.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Event handlers are created and state is allocated to keep track
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* of slave. Note: if slave was already managed for master by
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* Tk_MaintainGeometry, then the previous information is replaced
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* with the new information. The caller must eventually call
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* Tk_UnmaintainGeometry to eliminate the correspondence (or, the
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* state is automatically freed when either window is destroyed).
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*
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*----------------------------------------------------------------------
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*/
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void
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Tk_MaintainGeometry(slave, master, x, y, width, height)
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Tk_Window slave; /* Slave for geometry management. */
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Tk_Window master; /* Master for slave; must be a descendant
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* of slave's parent. */
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int x, y; /* Desired position of slave within master. */
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int width, height; /* Desired dimensions for slave. */
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{
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Tcl_HashEntry *hPtr;
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MaintainMaster *masterPtr;
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register MaintainSlave *slavePtr;
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int new, map;
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Tk_Window ancestor, parent;
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if (!initialized) {
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initialized = 1;
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Tcl_InitHashTable(&maintainHashTable, TCL_ONE_WORD_KEYS);
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}
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/*
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* See if there is already a MaintainMaster structure for the master;
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* if not, then create one.
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*/
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parent = Tk_Parent(slave);
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hPtr = Tcl_CreateHashEntry(&maintainHashTable, (char *) master, &new);
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if (!new) {
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masterPtr = (MaintainMaster *) Tcl_GetHashValue(hPtr);
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} else {
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masterPtr = (MaintainMaster *) ckalloc(sizeof(MaintainMaster));
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masterPtr->ancestor = master;
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masterPtr->checkScheduled = 0;
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masterPtr->slavePtr = NULL;
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Tcl_SetHashValue(hPtr, masterPtr);
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}
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/*
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* Create a MaintainSlave structure for the slave if there isn't
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* already one.
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*/
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for (slavePtr = masterPtr->slavePtr; slavePtr != NULL;
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slavePtr = slavePtr->nextPtr) {
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if (slavePtr->slave == slave) {
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goto gotSlave;
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}
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}
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slavePtr = (MaintainSlave *) ckalloc(sizeof(MaintainSlave));
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slavePtr->slave = slave;
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slavePtr->master = master;
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slavePtr->nextPtr = masterPtr->slavePtr;
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masterPtr->slavePtr = slavePtr;
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Tk_CreateEventHandler(slave, StructureNotifyMask, MaintainSlaveProc,
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(ClientData) slavePtr);
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/*
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* Make sure that there are event handlers registered for all
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* the windows between master and slave's parent (including master
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* but not slave's parent). There may already be handlers for master
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* and some of its ancestors (masterPtr->ancestor tells how many).
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*/
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for (ancestor = master; ancestor != parent;
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ancestor = Tk_Parent(ancestor)) {
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if (ancestor == masterPtr->ancestor) {
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Tk_CreateEventHandler(ancestor, StructureNotifyMask,
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MaintainMasterProc, (ClientData) masterPtr);
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masterPtr->ancestor = Tk_Parent(ancestor);
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}
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}
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/*
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* Fill in up-to-date information in the structure, then update the
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* window if it's not currently in the right place or state.
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*/
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gotSlave:
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slavePtr->x = x;
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slavePtr->y = y;
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slavePtr->width = width;
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slavePtr->height = height;
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map = 1;
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for (ancestor = slavePtr->master; ; ancestor = Tk_Parent(ancestor)) {
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if (!Tk_IsMapped(ancestor) && (ancestor != parent)) {
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map = 0;
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}
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if (ancestor == parent) {
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if ((x != Tk_X(slavePtr->slave))
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|| (y != Tk_Y(slavePtr->slave))
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|| (width != Tk_Width(slavePtr->slave))
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|| (height != Tk_Height(slavePtr->slave))) {
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Tk_MoveResizeWindow(slavePtr->slave, x, y, width, height);
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}
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if (map) {
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Tk_MapWindow(slavePtr->slave);
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} else {
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Tk_UnmapWindow(slavePtr->slave);
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}
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break;
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}
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x += Tk_X(ancestor) + Tk_Changes(ancestor)->border_width;
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y += Tk_Y(ancestor) + Tk_Changes(ancestor)->border_width;
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tk_UnmaintainGeometry --
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*
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* This procedure cancels a previous Tk_MaintainGeometry call,
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* so that the relationship between slave and master is no longer
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* maintained.
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*
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* Results:
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* None.
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||
*
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* Side effects:
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* The slave is unmapped and state is released, so that slave won't
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* track master any more. If we weren't previously managing slave
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* relative to master, then this procedure has no effect.
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||
*
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*----------------------------------------------------------------------
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*/
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void
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Tk_UnmaintainGeometry(slave, master)
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Tk_Window slave; /* Slave for geometry management. */
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Tk_Window master; /* Master for slave; must be a descendant
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* of slave's parent. */
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{
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||
Tcl_HashEntry *hPtr;
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||
MaintainMaster *masterPtr;
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register MaintainSlave *slavePtr, *prevPtr;
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Tk_Window ancestor;
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||
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if (!initialized) {
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initialized = 1;
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Tcl_InitHashTable(&maintainHashTable, TCL_ONE_WORD_KEYS);
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}
|
||
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if (!(((TkWindow *) slave)->flags & TK_ALREADY_DEAD)) {
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Tk_UnmapWindow(slave);
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}
|
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hPtr = Tcl_FindHashEntry(&maintainHashTable, (char *) master);
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||
if (hPtr == NULL) {
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||
return;
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||
}
|
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masterPtr = (MaintainMaster *) Tcl_GetHashValue(hPtr);
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||
slavePtr = masterPtr->slavePtr;
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||
if (slavePtr->slave == slave) {
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masterPtr->slavePtr = slavePtr->nextPtr;
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||
} else {
|
||
for (prevPtr = slavePtr, slavePtr = slavePtr->nextPtr; ;
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prevPtr = slavePtr, slavePtr = slavePtr->nextPtr) {
|
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if (slavePtr == NULL) {
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||
return;
|
||
}
|
||
if (slavePtr->slave == slave) {
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prevPtr->nextPtr = slavePtr->nextPtr;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
Tk_DeleteEventHandler(slavePtr->slave, StructureNotifyMask,
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MaintainSlaveProc, (ClientData) slavePtr);
|
||
ckfree((char *) slavePtr);
|
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if (masterPtr->slavePtr == NULL) {
|
||
if (masterPtr->ancestor != NULL) {
|
||
for (ancestor = master; ; ancestor = Tk_Parent(ancestor)) {
|
||
Tk_DeleteEventHandler(ancestor, StructureNotifyMask,
|
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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;
|
||
}
|
||
}
|
||
}
|