Tk Library Procedures Tk_SetClassProcs(3TK)
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NAME
Tk_SetClassProcs - register widget specific procedures
SYNOPSIS
#include
Tk_SetClassProcs(tkwin, procs, instanceData)
ARGUMENTSTk_Window tkwin (in) Token for window to
modify.Tk_ClassProcs *procs (in) Pointer to data
structure containingwidget specific pro-
cedures. The data structure pointed to by procs must be static: Tk keeps a reference to it as long as the window exists.ClientData instanceData (in) Arbitrary one-word
value to pass to widget callbacks._________________________________________________________________
DESCRIPTION
Tk_SetClassProcs is called to register a set of procedures
that are used as callbacks in different places. The structure pointed to by procs contains the following:typedef struct Tk_ClassProcs {
unsigned int size;Tk_ClassWorldChangedProc *worldChangedProc;
Tk_ClassCreateProc *createProc;
Tk_ClassModalProc *modalProc;
} Tk_ClassProcs;
The size field is used to simplify future expansion of the structure. It should always be set to (literally)sizeof(Tk_ClassProcs).
worldChangedProc is invoked when the system has altered in some way that requires some reaction from the widget. For example, when a font alias (see the font manual entry) is reconfigured, widgets configured to use that font alias must update their display accordingly. worldChangedProc should have arguments and results that match the type Tk Last change: 8.4 1Tk Library Procedures Tk_SetClassProcs(3TK)
Tk_ClassWorldChangedProc:
typedef void Tk_ClassWorldChangedProc(
ClientData instanceData); The instanceData parameter passed to the worldChangedProc will be identical to the instanceData paramter passed toTk_SetClassProcs.
createProc is used to create platform-dependant windows. It
is invoked by Tk_MakeWindowExist. createProc should have
arguments and results that match the typeTk_ClassCreateProc:
typedef Window Tk_ClassCreateProc(
Tk_Window tkwin,
Window parent, ClientData instanceData); The tkwin and instanceData parameters will be identical to the tkwin and instanceData parameters passed toTk_SetClassProcs. The parent parameter will be the parent
of the window to be created. The createProc should return the created window. modalProc is invoked after all bindings on a widget have been triggered in order to handle a modal loop. modalProc should have arguments and results that match the typeTk_ClassModalProc:
typedef void Tk_ClassModalProc(
Tk_Window tkwin,
XEvent *eventPtr); The tkwin parameter to modalProc will be identical to thetkwin parameter passed to Tk_SetClassProcs. The eventPtr
parameter will be a pointer to an XEvent structure describ-
ing the event being processed. KEYWORDS callback, classATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes: Tk Last change: 8.4 2Tk Library Procedures Tk_SetClassProcs(3TK)
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| ATTRIBUTE TYPE | ATTRIBUTE VALUE|
|____________________|__________________|_
| Availability | runtime/tk-8 |
|____________________|__________________|_
| Interface Stability| Uncommitted ||____________________|_________________|
NOTES Source for Tk is available on http://opensolaris.org. Tk Last change: 8.4 3