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Advanced Perl Programming

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Previous: A.4 ListboxAppendix A
Tk Widget Reference
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A.5 Menus

Menu buttons support the methods shown in Table A.9. They also support the methods of Table A.10 and delegate those calls to the underlying Menu widget.


Table A.9: MenuButton Widget Properties and Methods

Properties

Description

indicatorOn

If true, shows a small diamond to the right of the entry.

state

normal, active, or disabled.

Methods

command

separator

radiobutton

checkbutton

cascade

These methods are simply delegated to the underlying menu. Please see the menu object's description in Table A.10.

menu

Return the underlying menu associated with this menu button.

Each method of the Menu widget understands the following indexing syntax:

number

The index of the entry, starting from 0. When the tear-off option is active, the 0th entry is a separator automatically inserted by the menu.

end, last

Indicates the last entry.

active

Where the location cursor is currently poised. The active location appears underlined.

none

Indicates that none are active. Used along with activate() to deactivate all entries.

pattern

A pattern to be matched against all entries. Currently, only exact matches are guaranteed to work.

Table A.10 shows the properties of the Menu widget and the options available for each type of entry.


Table A.10: Menu Widget Properties and Methods

Menu Widget Properties

Description

indicatorOn

If true, shows a small diamond to the right of the entry.

selectColor

The color of the indicator, if one is displayed.

tearOff

If true, the 0th entry of the menu is a separator. When you click on it, the menu "tears off" and gets a separate top-level window.

Menu Entry Properties

Appearance:

foreground, background, font, image, indicatorOn,label

The usual properties. Note that it is label, not text.

underline

The integer index of a character to underline.

accelerator keysequence

Shows a string to be displayed on the right of the label. Unlike Motif, you have to set up the key binding (typically on the top window) yourself. This option is for display only.

Action and Values:

state

normal, active, or disabled.

command

For buttonlike entries, the reference of a subroutine to call.

value var

For radiobutton entries. Please see Table A.3.

variable var

Available only for checkbutton and radiobutton entries.

onvalue val, offvalue val

For checkbutton entries. Stored in the associated variable.

Methods

command (options)

separator (options)

radiobutton (options)

checkbutton (options)

cascade (options)

Creates the corresponding type of entry item. Each entry takes its own configuration options, as illustrated above.

add (type,options)

The commands above translate to this call.

delete (index1, [index2])

Deletes entry or range of entries.

insert (index1, type, options)

Like add, but inserts at the requested index.

entryconfigure (index, options),

entrycget (index)

Configure and retrieve menu entry properties.


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