153 lines
6.5 KiB
Plaintext
153 lines
6.5 KiB
Plaintext
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'\"
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'\" Copyright (c) 1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" SCCS: @(#) getOpenFile.n 1.7 96/09/19 17:02:01
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'\"
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.so man.macros
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.TH tk_getOpenFile n 4.2 Tk "Tk Built-In Commands"
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.BS
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'\" Note: do not modify the .SH NAME line immediately below!
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.SH NAME
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tk_getOpenFile, tk_getSaveFile \- pop up a dialog box for the user to select a file to open or save.
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.PP
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.PP
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.SH SYNOPSIS
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\fBtk_getOpenFile \fR?\fIoption value ...\fR?
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.br
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\fBtk_getSaveFile \fR?\fIoption value ...\fR?
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.BE
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.SH DESCRIPTION
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.PP
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The procedures \fBtk_getOpenFile\fR and \fBtk_getSaveFile\fR pop up a
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dialog box for the user to select a file to open or save. The
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\fBtk_getOpenFile\fR command is usually associated with the \fBOpen\fR
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command in the \fBFile\fR menu. Its purpose is for the user to select an
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existing file \fIonly\fR. If the user enters an non-existent file, the
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dialog box gives the user an error prompt and requires the user to give
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an alternative selection. If an application allows the user to create
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new files, it should do so by providing a separate \fBNew\fR menu command.
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.PP
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The \fBtk_getSaveFile\fR command is usually associated with the \fBSave
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as\fR command in the \fBFile\fR menu. If the user enters a file that
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already exists, the dialog box prompts the user for confirmation
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whether the existing file should be overwritten or not.
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.PP
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The following \fIoption\-value\fR pairs are possible as command line
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arguments to these two commands:
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.TP
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\fB\-defaultextension\fR \fIextension\fR
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Specifies a string that will be appended to the filename if the user
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enters a filename without an extension. The defaut value is the empty
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string, which means no extension will be appended to the filename in
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any case. This option is ignored on the Macintosh platform, which
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does not require extensions to filenames.
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.TP
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\fB\-filetypes\fR \fIfilePatternList\fR
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If a \fBFile types\fR listbox exists in the file dialog on the particular
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platform, this option gives the \fIfiletype\fRs in this listbox. When
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the user choose a filetype in the listbox, only the files of that type
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are listed. If this option is unspecified, or if it is set to the
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empty list, or if the \fBFile types\fR listbox is not supported by the
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particular platform then all files are listed regardless of their
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types. See the section SPECIFYING FILE PATTERNS below for a
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discussion on the contents of \fIfilePatternList\fR.
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.TP
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\fB\-initialdir\fR \fIdirectory\fR
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Specifies that the files in \fIdirectory\fR should be displayed
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when the dialog pops up. If this parameter is not specified, then
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the files in the current working directory are displayed.
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.TP
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\fB\-initialfile\fR \fIfilename\fR
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Specifies a filename to be displayed in the dialog when it pops
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up. This option is ignored by the \fBtk_getOpenFile\fR command.
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.TP
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\fB\-parent\fR \fIwindow\fR
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Makes \fIwindow\fR the logical parent of the file dialog. The file
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dialog is displayed on top of its parent window.
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.TP
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\fB\-title\fR \fItitleString\fR
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Specifies a string to display as the title of the dialog box. If this
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option is not specified, then a default title is displayed. This
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option is ignored on the Macintosh platform.
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.PP
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If the user selects a file, both \fBtk_getOpenFile\fR and
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\fBtk_getSaveFile\fR return the full pathname of this file. If the
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user cancels the operation, both commands return the empty string.
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.SH "SPECIFYING FILE PATTERNS"
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The \fIfilePatternList\fR value given by the \fB\-filetypes\fR option
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is a list of file patterns. Each file pattern is a list of the
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form
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.CS
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\fItypeName\fR {\fIextension\fR ?\fIextension ...\fR?} ?{\fImacType\fR ?\fImacType ...\fR?}?
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.CE
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\fItypeName\fR is the name of the file type described by this
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file pattern and is the text string that appears in the \fBFile types\fR
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listbox. \fIextension\fR is a file extension for this file pattern.
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\fImacType\fR is a four-character Macintosh file type. The list of
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\fImacType\fRs is optional and may be omitted for applications that do
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not need to execute on the Macintosh platform.
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.PP
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Several file patterns may have the same \fItypeName,\fR in which case
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they refer to the same file type and share the same entry in the
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listbox. When the user selects an entry in the listbox, all the files
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that match at least one of the file patterns corresponding
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to that entry are listed. Usually, each file pattern corresponds to a
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distinct type of file. The use of more than one file patterns for one
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type of file is necessary on the Macintosh platform only.
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.PP
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On the Macintosh platform, a file matches a file pattern if its
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name matches at least one of the \fIextension\fR(s) AND it
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belongs to at least one of the \fImacType\fR(s) of the
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file pattern. For example, the \fBC Source Files\fR file pattern in the
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sample code matches with files that have a \fB\.c\fR extension AND
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belong to the \fImacType\fR \fBTEXT\fR. To use the OR rule instead,
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you can use two file patterns, one with the \fIextensions\fR only and
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the other with the \fImacType\fR only. The \fBGIF Files\fR file type
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in the sample code matches files that EITHER have a \fB\.gif\fR
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extension OR belong to the \fImacType\fR \fBGIFF\fR.
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.PP
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On the Unix and Windows platforms, a file matches a file pattern
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if its name matches at at least one of the \fIextension\fR(s) of
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the file pattern. The \fImacType\fRs are ignored.
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.SH "SPECIFYING EXTENSIONS"
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.PP
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On the Unix and Macintosh platforms, extensions are matched using
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glob-style pattern matching. On the Windows platforms, extensions are
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matched by the underlying operating system. The types of possible
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extensions are: (1) the special extension * matches any
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file; (2) the special extension "" matches any files that
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do not have an extension (i.e., the filename contains no full stop
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character); (3) any character string that does not contain any wild
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card characters (* and ?).
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.PP
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Due to the different pattern matching rules on the various platforms,
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to ensure portability, wild card characters are not allowed in the
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extensions, except as in the special extension *. Extensions
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without a full stop character (e.g, ~) are allowed but may not
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work on all platforms.
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.SH EXAMPLE
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.CS
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set types {
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{{Text Files} {.txt} }
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{{TCL Scripts} {.tcl} }
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{{C Source Files} {.c} TEXT}
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{{GIF Files} {.gif} }
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{{GIF Files} {} GIFF}
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{{All Files} * }
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}
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set filename [tk_getOpenFile -filetypes $types]
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if {$filename != ""} {
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# Open the file ...
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}
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.CE
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.SH KEYWORDS
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file selection dialog
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