1Menubutton(3)         User Contributed Perl Documentation        Menubutton(3)
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NAME

6       Tk::Menubutton - Create and manipulate Menubutton widgets
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SYNOPSIS

9       $menubutton = $parent->Menubutton(?options?);
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STANDARD OPTIONS

12       -activebackground   -cursor   -highlightthickness -takefocus
13       -activeforeground   -disabledforeground -image    -text
14       -anchor   -font     -justify  -textvariable
15       -background    -foreground    -padx     -underline
16       -bitmap   -highlightbackground     -pady     -wraplength
17       -borderwidth   -highlightcolor     -relief
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19       See Tk::options for details of the standard options.
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WIDGET-SPECIFIC OPTIONS

22       Command-Line Name: -compound
23       Database Name:  compound
24       Database Class: Compound
25           Specifies whether the button should display both an image and text,
26           and if so, where the image should be placed relative to the text.
27           Valid values for this option are bottom, center, left, none, right
28           and top.  The default value is none, meaning that the button will
29           display either an image or text, depending on the values of the
30           -image and -bitmap options.
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32       Name:     direction
33       Class:    Height
34       Switch:   -direction
35           Specifies where the menu is going to be popup up. above tries to
36           pop the menu above the menubutton. below tries to pop the menu
37           below the menubutton. left tries to pop the menu to the left of the
38           menubutton. right tries to pop the menu to the right of the menu
39           button. flush pops the menu directly over the menubutton.
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41       Name:     height
42       Class:    Height
43       Switch:   -height
44           Specifies a desired height for the menubutton.  If an image or
45           bitmap is being displayed in the menubutton then the value is in
46           screen units (i.e. any of the forms acceptable to Tk_GetPixels);
47           for text it is in lines of text.  If this option isn't specified,
48           the menubutton's desired height is computed from the size of the
49           image or bitmap or text being displayed in it.
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51       Name:     indicatorOn
52       Class:    IndicatorOn
53       Switch:   -indicatoron
54           The value must be a proper boolean value.  If it is true then a
55           small indicator rectangle will be displayed on the right side of
56           the menubutton and the default menu bindings will treat this as an
57           option menubutton.  If false then no indicator will be displayed.
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59       Name:     menu
60       Class:    MenuName
61       Switch:   -menu
62           Specifies the path name of the menu associated with this
63           menubutton.  The menu must be a child of the menubutton.
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65       Name:     state
66       Class:    State
67       Switch:   -state
68           Specifies one of three states for the menubutton:  normal, active,
69           or disabled.  In normal state the menubutton is displayed using the
70           foreground and background options.  The active state is typically
71           used when the pointer is over the menubutton.  In active state the
72           menubutton is displayed using the activeForeground and
73           activeBackground options.  Disabled state means that the menubutton
74           should be insensitive:  the default bindings will refuse to
75           activate the widget and will ignore mouse button presses.  In this
76           state the disabledForeground and background options determine how
77           the button is displayed.
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79       Name:     width
80       Class:    Width
81       Switch:   -width
82           Specifies a desired width for the menubutton.  If an image or
83           bitmap is being displayed in the menubutton then the value is in
84           screen units (i.e. any of the forms acceptable to Tk_GetPixels);
85           for text it is in characters.  If this option isn't specified, the
86           menubutton's desired width is computed from the size of the image
87           or bitmap or text being displayed in it.
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DESCRIPTION

90       The Menubutton method creates a new window (given by the $widget
91       argument) and makes it into a menubutton widget.  Additional options,
92       described above, may be specified on the command line or in the option
93       database to configure aspects of the menubutton such as its colors,
94       font, text, and initial relief.  The menubutton command returns its
95       $widget argument.  At the time this command is invoked, there must not
96       exist a window named $widget, but $widget's parent must exist.
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98       A menubutton is a widget that displays a textual string, bitmap, or
99       image and is associated with a menu widget.  If text is displayed, it
100       must all be in a single font, but it can occupy multiple lines on the
101       screen (if it contains newlines or if wrapping occurs because of the
102       wrapLength option) and one of the characters may optionally be
103       underlined using the underline option.  In normal usage, pressing mouse
104       button 1 over the menubutton causes the associated menu to be posted
105       just underneath the menubutton.  If the mouse is moved over the menu
106       before releasing the mouse button, the button release causes the
107       underlying menu entry to be invoked.  When the button is released, the
108       menu is unposted.
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110       Menubuttons are typically organized into groups called menu bars that
111       allow scanning: if the mouse button is pressed over one menubutton
112       (causing it to post its menu) and the mouse is moved over another
113       menubutton in the same menu bar without releasing the mouse button,
114       then the menu of the first menubutton is unposted and the menu of the
115       new menubutton is posted instead.
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117       There are several interactions between menubuttons and menus;  see the
118       menu manual entry for information on various menu configurations, such
119       as pulldown menus and option menus.
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WIDGET METHODS

122       The Menubutton method creates a widget object.  This object supports
123       the configure and cget methods described in Tk::options which can be
124       used to enquire and modify the options described above.  The menu
125       method returns the menu associated with the widget.  The widget also
126       inherits all the methods provided by the generic Tk::Widget class.
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DEFAULT BINDINGS

129       Tk automatically creates class bindings for menubuttons that give them
130       the following default behavior:
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132       [1] A menubutton activates whenever the mouse passes over it and
133           deactivates whenever the mouse leaves it.
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135       [2] Pressing mouse button 1 over a menubutton posts the menubutton: its
136           relief changes to raised and its associated menu is posted under
137           the menubutton.  If the mouse is dragged down into the menu with
138           the button still down, and if the mouse button is then released
139           over an entry in the menu, the menubutton is unposted and the menu
140           entry is invoked.
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142       [3] If button 1 is pressed over a menubutton and then released over
143           that menubutton, the menubutton stays posted: you can still move
144           the mouse over the menu and click button 1 on an entry to invoke
145           it.  Once a menu entry has been invoked, the menubutton unposts
146           itself.
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148       [4] If button 1 is pressed over a menubutton and then dragged over some
149           other menubutton, the original menubutton unposts itself and the
150           new menubutton posts.
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152       [5] If button 1 is pressed over a menubutton and released outside any
153           menubutton or menu, the menubutton unposts without invoking any
154           menu entry.
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156       [6] When a menubutton is posted, its associated menu claims the input
157           focus to allow keyboard traversal of the menu and its submenus.
158           See the menu documentation for details on these bindings.
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160       [7] If the underline option has been specified for a menubutton then
161           keyboard traversal may be used to post the menubutton: Alt+x, where
162           x is the underlined character (or its lower-case or upper-case
163           equivalent), may be typed in any window under the menubutton's
164           toplevel to post the menubutton.
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166       [8] The F10 key may be typed in any window to post the first menubutton
167           under its toplevel window that isn't disabled.
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169       [9] If a menubutton has the input focus, the space and return keys post
170           the menubutton.
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172           If the menubutton's state is disabled then none of the above
173           actions occur:  the menubutton is completely non-responsive.
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175           The behavior of menubuttons can be changed by defining new bindings
176           for individual widgets or by redefining the class bindings.
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KEYWORDS

179       menubutton, widget
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183perl v5.30.1                      2020-01-30                     Menubutton(3)
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