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| -rw-r--r-- | doc/SetClassProcs.3 | 91 |
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diff --git a/doc/SetClassProcs.3 b/doc/SetClassProcs.3 new file mode 100644 index 0000000..27c1438 --- /dev/null +++ b/doc/SetClassProcs.3 @@ -0,0 +1,91 @@ +'\" +'\" Copyright (c) 2000 Ajuba Solutions. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +'\" RCS: @(#) $Id: SetClassProcs.3,v 1.1 2000/11/22 01:50:26 ericm Exp $ +'\" +.so man.macros +.TH Tk_SetClassProcs 3 8.4 Tk "Tk Library Procedures" +.BS +.SH NAME +Tk_SetClassProcs \- register widget specific procedures +.SH SYNOPSIS +.nf +\fB#include <tk.h>\fR +.sp +\fBTk_SetClassProcs\fR(\fItkwin, procs, instanceData\fR) +.SH ARGUMENTS +.AS Tk_ClassProc instanceData +.AP Tk_Window tkwin in +Token for window to modify. +.AP Tk_ClassProcs *procs in +Pointer to data structure containing widget specific procedures. +The data structure pointed to by \fIprocs\fR must be static: +Tk keeps a reference to it as long as the window exists. +.AP ClientData instanceData in +Arbitrary one-word value to pass to widget callbacks. +.BE + +.SH DESCRIPTION +.PP +\fBTk_SetClassProcs\fR is called to register a set of procedures that +are used as callbacks in different places. +.PP +The structure pointed to by \fIprocs\fR contains the following: +.CS +typedef struct Tk_ClassProcs { + unsigned int \fIsize\fR; + Tk_ClassWorldChangedProc *\fIworldChangedProc\fR; + Tk_ClassCreateProc *\fIcreateProc\fR; + Tk_ClassModalProc *\fImodalProc\fR; +} Tk_ClassProcs; +.CE +The \fIsize\fR field is used to simplify future expansion of the +structure. It should always be set to (literally) \fBsizeof(Tk_ClassProcs)\fR. +.PP +\fIworldChangedProc\fR 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 \fBfont\fR manual entry) is reconfigured, +widgets configured to use that font alias must update their display +accordingly. \fIworldChangedProc\fR should have arguments and results +that match the type \fBTk_ClassWorldChangedProc\fR: +.CS +typedef void Tk_ClassWorldChangedProc( + ClientData \fIinstanceData\fR); +.CE +The \fIinstanceData\fR parameter passed to the \fIworldChangedProc\fR +will be identical to the \fIinstanceData\fR paramter passed to +\fBTk_SetClassProcs\fR. +.PP +\fIcreateProc\fR is used to create platform-dependant windows. It is +invoked by \fBTk_MakeWindowExist\fR. \fIcreateProc\fR should have +arguments and results that match the type \fBTk_ClassCreateProc\fR: +.CS +typedef Window Tk_ClassCreateProc( + Tk_Window \fItkwin\fR, + Window \fIparent\fR, + ClientData \fIinstanceData\fR); +.CE +The \fItkwin\fR and \fIinstanceData\fR parameters will be identical to +the \fItkwin\fR and \fIinstanceData\fR parameters passed to +\fBTk_SetClassProcs\fR. The \fIparent\fR parameter will be the parent +of the window to be created. The \fIcreateProc\fR should return the +created window. +.PP +\fImodalProc\fR is invoked after all bindings on a widget have been +triggered in order to handle a modal loop. \fImodalProc\fR should +have arguments and results that match the type \fBTk_ClassModalProc\fR: +.CS +typedef void Tk_ClassModalProc( + Tk_Window \fItkwin\fR, + XEvent *\fIeventPtr\fR); +.CE +The \fItkwin\fR parameter to \fImodalProc\fR will be identical to the +\fItkwin\fR parameter passed to \fBTk_SetClassProcs\fR. The +\fIeventPtr\fR parameter will be a pointer to an XEvent structure +describing the event being processed. + +.SH KEYWORDS +callback, class |