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author | rjohnson <rjohnson> | 1998-04-01 09:37:39 (GMT) |
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committer | rjohnson <rjohnson> | 1998-04-01 09:37:39 (GMT) |
commit | 13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22 (patch) | |
tree | 3100714738a7941b590efee466a774862f9671c3 /doc/GetFont.3 | |
parent | e4ab1102029f9ac557ff190bfb9d34408340f345 (diff) | |
download | tk-13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22.zip tk-13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22.tar.gz tk-13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22.tar.bz2 |
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diff --git a/doc/GetFont.3 b/doc/GetFont.3 new file mode 100644 index 0000000..ec6c052 --- /dev/null +++ b/doc/GetFont.3 @@ -0,0 +1,74 @@ +'\" +'\" Copyright (c) 1990-1992 The Regents of the University of California. +'\" Copyright (c) 1994-1996 Sun Microsystems, Inc. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +'\" SCCS: @(#) GetFont.3 1.11 96/07/31 14:07:40 +'\" +.so man.macros +.TH Tk_GetFont 3 "" Tk "Tk Library Procedures" +.BS +.SH NAME +Tk_GetFont, Tk_NameOfFont, Tk_FreeFont \- maintain database of fonts +.SH SYNOPSIS +.nf +\fB#include <tk.h>\fR +.sp +Tk_Font +\fBTk_GetFont(\fIinterp, tkwin, string\fB)\fR +.sp +char * +\fBTk_NameOfFont(\fItkfont\fB)\fR +.sp +void +\fBTk_FreeFont(\fItkfont\fB)\fR + +.SH ARGUMENTS +.AS "const char" *tkfont +.AP "Tcl_Interp" *interp in +Interpreter to use for error reporting. +.AP Tk_Window tkwin in +Token for window on the display in which font will be used. +.AP "const char" *string in +Name or description of desired font. See documentation for the \fBfont\fR +command for details on acceptable formats. +.AP Tk_Font tkfont in +Opaque font token. +.BE +.SH DESCRIPTION +.PP +\fBTk_GetFont\fR finds the font indicated by \fIstring\fR and returns a +token that represents the font. The return value can be used in subsequent +calls to procedures such as \fBTk_FontMetrics\fR, \fBTk_MeasureChars\fR, and +\fBTk_FreeFont\fR. The token returned by \fBTk_GetFont\fR will remain +valid until \fBTk_FreeFont\fR is called to release it. \fIString\fR can +be either a symbolic name or a font description; see the documentation for +the \fBfont\fR command for a description of the valid formats. If +\fBTk_GetFont\fR is unsuccessful (because, for example, \fIstring\fR was +not a valid font specification) then it returns \fBNULL\fR and stores an +error message in \fIinterp->result\fR. +.PP +\fBTk_GetFont\fR maintains a database of all fonts it has allocated. If +the same \fIstring\fR is requested multiple times (e.g. by different +windows or for different purposes), then additional calls for the same +\fIstring\fR will be handled without involving the platform-specific +graphics server. +.PP +The procedure \fBTk_NameOfFont\fR is roughly the inverse of +\fBTk_GetFont\fR. Given a \fItkfont\fR that was created by +\fBTk_GetFont\fR, the return value is the \fIstring\fR argument that was +passed to \fBTk_GetFont\fR to create the font. The string returned by +\fBTk_NameOfFont\fR is only guaranteed to persist until the \fItkfont\fR +is deleted. The caller must not modify this string. +.PP +When a font returned by \fBTk_GetFont\fR is no longer needed, +\fBTk_FreeFont\fR should be called to release it. There should be +exactly one call to \fBTk_FreeFont\fR for each call to \fBTk_GetFont\fR. +When a font is no longer in use anywhere (i.e. it has been freed as many +times as it has been gotten) \fBTk_FreeFont\fR will release any +platform-specific storage and delete it from the database. + +.SH KEYWORDS +font |