Tk_ManageGeometry(3) Tk Library Procedures Tk_ManageGeometry(3) ______________________________________________________________________________
NAME
Tk_ManageGeometry - arrange to handle geometry requests for a window
SYNOPSIS
#include <tk.h>
Tk_ManageGeometry(tkwin, mgrPtr, clientData)
ARGUMENTS
Tk_Window tkwin (in) Token for window to be man-
aged.
const Tk_GeomMgr *mgrPtr (in) Pointer to data structure con-
taining information about the
geometry manager, or NULL to
indicate that tkwin's geometry
should not 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 call-
backs.
______________________________________________________________________________
DESCRIPTION
Tk_ManageGeometry arranges for a particular geometry manager, described
by the mgrPtr argument, to control the geometry of a particular content
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 geom-
etry manager:
typedef struct {
const 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 man-
ager.
requestProc is a procedure in the geometry manager that will be invoked
whenever Tk_GeometryRequest is called by the content window 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 cur-
rent 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
Tk 4.0 Tk_ManageGeometry(3)
tk 8.6.11 - Generated Fri Jan 22 15:39:47 CST 2021