Tk_ManageGeometry (3)
arrange to handle geometry requests for a window
SYNOPSIS
#include <tk.h>
Tk_ManageGeometry(tkwin, mgrPtr, clientData)
ARGUMENTS
Tk_GeometryProc clientData
Tk_Window tkwin in
Token for window to be managed.
Tk_GeomMgr *mgrPtr in
Pointer to data structure containing information about the
geometry manager, or NULL to indicate that tkwin's geometry
shouldn't be managed anymore.
The data structure pointed to by mgrPtr must be static:
Tk keeps a reference to it as long as the window is managed.
ClientData clientData in
Arbitrary one-word value to pass to geometry manager callbacks.
DESCRIPTION
Tk_ManageGeometry arranges for a particular geometry manager,
described by the mgrPtr argument, to control the geometry
of a particular slave window, given by tkwin.
If tkwin was previously managed by some other geometry manager,
the previous manager loses control in favor of the new one.
If mgrPtr is NULL, geometry management is cancelled for
tkwin.
The structure pointed to by mgrPtr contains information about
the geometry manager:
typedef struct {
char *name;
Tk_GeomRequestProc *requestProc;
Tk_GeomLostSlaveProc *lostSlaveProc;
} Tk_GeomMgr;
The name field is the textual name for the geometry manager,
such as pack or place; this value will be returned
by the command winfo manager.
requestProc is a procedure in the geometry manager that
will be invoked whenever Tk_GeometryRequest is called by the
slave to change its desired geometry.
requestProc should have arguments and results that match the
type Tk_GeomRequestProc:
typedef void Tk_GeomRequestProc(
ClientData clientData,
Tk_Window tkwin);
The parameters to requestProc will be identical to the
corresponding parameters passed to Tk_ManageGeometry.
clientData usually points to a data
structure containing application-specific information about
how to manage tkwin's geometry.
The lostSlaveProc field of mgrPtr points to another
procedure in the geometry manager.
Tk will invoke lostSlaveProc if some other manager
calls Tk_ManageGeometry to claim
tkwin away from the current geometry manager.
lostSlaveProc is not invoked if Tk_ManageGeometry is
called with a NULL value for mgrPtr (presumably the current
geometry manager has made this call, so it already knows that the
window is no longer managed), nor is it called if mgrPtr
is the same as the window's current geometry manager.
lostSlaveProc should have
arguments and results that match the following prototype:
typedef void Tk_GeomLostSlaveProc(
ClientData clientData,
Tk_Window tkwin);
The parameters to lostSlaveProc will be identical to the
corresponding parameters passed to Tk_ManageGeometry.
KEYWORDS
callback, geometry, managed, request, unmanaged
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