Tk_ManageGeometry(3)

NAME
Tk_ManageGeometry - arrange to handle geometry requests for a window

SYNOPSIS
#include <tk.h>

Tk_ManageGeometry(tkwin, mgrPtr, clientData)

ARGUMENTS
Token for window to be managed. Pointer to data structure containing 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. 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 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 geometry manager: typedef struct {
    const char *name;
    Tk_GeomRequestProc *requestProc;
    Tk_GeomLostContentProc *lostContentProc; } 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 content window to change its desired geometry. requestProc should have arguments and results that match the type Tk_GeomRequestProc: typedef void Tk_GeomRequestProc(
        void *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 lostContentProc field of mgrPtr points to another procedure in the geometry manager. Tk will invoke lostContentProc if some other manager calls Tk_ManageGeometry to claim tkwin away from the current geometry manager. lostContentProc 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. lostContentProc should have arguments and results that match the following prototype: typedef void Tk_GeomLostContentProc(
        void *clientData,
        Tk_Window tkwin); The parameters to lostContentProc will be identical to the corresponding parameters passed to Tk_ManageGeometry.

KEYWORDS
callback, geometry, managed, request, unmanaged