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- '\" $Header: /user6/ouster/wish/man/RCS/menubar.n,v 1.4 93/09/04 17:03:40 ouster Exp $ SPRITE (Berkeley)
- '/"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
- .\" manual entries.
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- .HS tk_menuBar tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- tk_menuBar, tk_bindForTraversal \- Support for menu bars
- .SH SYNOPSIS
- \fBtk_menuBar \fIframe \fR?\fImenu menu ...\fR?
- .sp
- \fBtk_bindForTraversal \fIarg arg ... \fR
- .BE
-
- .SH DESCRIPTION
- .PP
- These two commands are Tcl procedures in the Tk script library.
- They provide support for menu bars.
- A menu bar is a frame that contains a collection of menu buttons that
- work together, so that the user can scan from one menu to another with
- the mouse: if the mouse button is pressed over one menubutton (causing it
- to post its menu) and the mouse is moved over another menubutton
- in the same menu bar without releasing the mouse button, then the
- menu of the first menubutton is unposted and the menu of the
- new menubutton is posted instead.
- Menus in a menu bar can also be accessed using keyboard traversal (i.e.
- by typing keystrokes instead of using the mouse).
- In order for an application to use these procedures, it must do three
- things, which are described in the paragraphs below.
- .PP
- First, each application must call \fBtk_menuBar\fR to provide information
- about the menubar.
- The \fIframe\fR argument gives the path name of the frame that contains
- all of the menu buttons, and the \fImenu\fR arguments give path names
- for all of the menu buttons associated with the menu bar.
- Normally \fIframe\fR is the parent of each of the \fImenu\fR's.
- This need not be the case, but \fIframe\fR must be an ancestor of
- each of the \fImenu\fR's in order for grabs to work correctly when
- the mouse is used to pull down menus.
- The order of the \fImenu\fR arguments determines the traversal order
- for the menu buttons.
- If \fBtk_menuBar\fR is called without any \fImenu\fR arguments, it
- returns a list containing the current menu buttons for \fIframe\fR,
- or an empty string if \fIframe\fR isn't currently set up as a menu bar.
- If \fBtk_menuBar\fR is called with a single \fImenu\fR argument
- consisting of an empty string, any menubar information for \fIframe\fR
- is removed; from now on the menu buttons will function independently
- without keyboard traversal.
- Only one menu bar may be defined at a time within each top-level window.
- .PP
- The second thing an application must do is to identify the traversal
- characters for menu buttons and menu entries.
- This is done by underlining those characters using the
- \fB\-underline\fR options for the widgets.
- The menu traversal system uses this information to traverse the
- menus under keyboard control (see below).
- .PP
- The third thing that an application must do
- is to make sure that the input focus is always in a window that
- has been configured to support menu traversal.
- If the input focus is \fBnone\fR then input characters will
- be discarded and no menu traversal will be possible.
- .VS
- If you have no other place to set the focus, set it to the menubar
- widget: \fBtk_menuBar\fR creates bindings for its \fIframe\fR argument to
- support menu traversal.
- .PP
- The Tk startup scripts configure all the Tk widget classes with
- bindings to support menu traversal, so menu traversal will be possible
- regardless of which widget has the focus.
- .VE
- If your application defines new classes of widgets that support the
- input focus, then you should call \fBtk_bindForTraversal\fR for
- each of these classes.
- \fBTk_bindForTraversal\fR takes any number of arguments, each of
- which is a widget path name or widget class name.
- It sets up bindings for all the named widgets and
- classes so that the menu traversal system will be invoked when
- appropriate keystrokes are typed in those widgets or classes.
-
- .SH "MENU TRAVERSAL BINDINGS"
- .PP
- Once an application has made the three arrangements described
- above, menu traversal will be available.
- At any given time, the only menus available for traversal
- are those associated with the top-level window containing the
- input focus.
- Menu traversal is initiated by one of the following actions:
- .IP [1]
- If <F10> is typed, then the first menu button in the list for the
- top-level window is posted and the first entry within that
- menu is selected.
- .IP [2]
- If <Alt-\fIkey\fR> is pressed, then the menu button that has \fIkey\fR
- as its underlined character is posted
- and the first entry within that menu is selected.
- The comparison between \fIkey\fR and the underlined characters
- ignores case differences.
- If no menu button matches \fIkey\fR then the keystroke has no
- effect.
- .IP [3]
- Clicking mouse button 1 on a menu button posts that menu and selects
- its first entry.
- .PP
- Once a menu has been posted, the input focus is switched to that
- menu and the following actions are possible:
- .IP [1]
- Typing <ESC> or clicking mouse button 1 outside the menu button or
- its menu will abort the menu traversal.
- .IP [2]
- If <Alt-\fIkey\fR> is pressed, then the entry in the posted menu
- whose underlined character is \fIkey\fR is invoked.
- This causes the menu to be unposted, the entry's action to be
- taken, and the menu traversal to end.
- The comparison between \fIkey\fR and underlined characters ignores
- case differences.
- If no menu entry matches \fIkey\fR then the keystroke is ignored.
- .IP [3]
- The arrow keys may be used to move among entries and menus.
- The left and right arrow keys move circularly among the available
- menus and the up and down arrow keys move circularly among the
- entries in the current menu.
- .IP [4]
- If <Return> is pressed, the selected entry in the posted menu is
- invoked, which causes the menu to be unposted, the entry's action
- to be taken, and the menu traversal to end.
- .PP
- When a menu traversal completes, the input focus reverts to the
- window that contained it when the traversal started.
-
- .SH KEYWORDS
- keyboard traversal, menu, menu bar, post
-