GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  TK::BUTTON (3)

.ds Aq ’

NAME

Tk::Button - Create and manipulate Button widgets

CONTENTS

SYNOPSIS

$button = $parent-><B>ButtonB>(?options?);

STANDARD OPTIONS

<B>-activebackgroundB> <B>-activeforegroundB> <B>-anchorB> <B>-backgroundB> <B>-bitmapB> <B>-borderwidthB> <B>-compoundB> <B>-cursorB> <B>-disabledforegroundB> <B>-fontB> <B>-foregroundB> <B>-highlightbackgroundB> <B>-highlightcolorB> <B>-highlightthicknessB> <B>-imageB> <B>-justifyB> <B>-padxB> <B>-padyB> <B>-reliefB> <B>-repeatdelayB> <B>-repeatintervalB> <B>-takefocusB> <B>-textB> <B>-textvariableB> <B>-underlineB> <B>-wraplengthB>

See Tk::options for details of the standard options.

WIDGET-SPECIFIC OPTIONS

Name:  <B>commandB>
Class: <B>CommandB>
Switch:        <B>-commandB> Specifies a Perl/Tk callback to associate with the button. This command is typically invoked when mouse button 1 is released over the button window.
Command-Line Name: <B>-compoundB>
Database Name: <B>compoundB>
Database Class: <B>CompoundB> Specifies whether the button should display both an image and text, and if so, where the image should be placed relative to the text. Valid values for this option are <B>bottomB>, <B>centerB>, <B>leftB>, <B>noneB>, <B>rightB> and <B>topB>. The default value is <B>noneB>, meaning that the button will display either an image or text, depending on the values of the -image and -bitmap options.
Name:  <B>defaultB>
Class: <B>DefaultB>
Switch:        <B>-defaultB> Specifies one of three states for the default ring: <B>normalB>, <B>activeB>, or <B>disabledB>. In active state, the button is drawn with the platform specific appearance for a default button. In normal state, the button is drawn with the platform specific appearance for a non-default button, leaving enough space to draw the default button appearance. The normal and active states will result in buttons of the same size. In disabled state, the button is drawn with the non-default button appearance without leaving space for the default appearance. The disabled state may result in a smaller button than the active state. ring.
Name:  <B>heightB>
Class: <B>HeightB>
Switch:        <B>-heightB> Specifies a desired height for the button. If an image or bitmap is being displayed in the button then the value is in screen units (i.e. any of the forms acceptable to <B>Tk_GetPixelsB>); for text it is in lines of text. If this option isn’t specified, the button’s desired height is computed from the size of the image or bitmap or text being displayed in it.
Command-Line Name: <B>-overreliefB>
Database Name: <B>overReliefB>
Database Class: <B>OverReliefB> Specifies an alternative relief for the button, to be used when the mouse cursor is over the widget. This option can be used to make toolbar buttons, by configuring <B>-relief flat -overrelief raisedB>. If the value of this option is the empty string, then no alternative relief is used when the mouse cursor is over the button. The empty string is the default value.
Name:  <B>stateB>
Class: <B>StateB>
Switch:        <B>-stateB> Specifies one of three states for the button: <B>normalB>, <B>activeB>, or <B>disabledB>. In normal state the button is displayed using the <B>foregroundB> and <B>backgroundB> options. The active state is typically used when the pointer is over the button. In active state the button is displayed using the <B>activeForegroundB> and <B>activeBackgroundB> options. Disabled state means that the button should be insensitive: the default bindings will refuse to activate the widget and will ignore mouse button presses. In this state the <B>disabledForegroundB> and <B>backgroundB> options determine how the button is displayed.
Name:  <B>widthB>
Class: <B>WidthB>
Switch:        <B>-widthB> Specifies a desired width for the button. If an image or bitmap is being displayed in the button then the value is in screen units (i.e. any of the forms acceptable to <B>Tk_GetPixelsB>); for text it is in characters. If this option isn’t specified, the button’s desired width is computed from the size of the image or bitmap or text being displayed in it.

DESCRIPTION

The <B>ButtonB> method creates a new window (given by the $widget argument) and makes it into a button widget. Additional options, described above, may be specified on the command line or in the option database to configure aspects of the button such as its colors, font, text, and initial relief. The <B>buttonB> command returns its $widget argument. At the time this command is invoked, there must not exist a window named $widget, but $widget’s parent must exist.

A button is a widget that displays a textual string, bitmap or image. If text is displayed, it must all be in a single font, but it can occupy multiple lines on the screen (if it contains newlines or if wrapping occurs because of the <B>-wraplengthB> option) and one of the characters may optionally be underlined using the <B>-underlineB> option. It can display itself in either of three different ways, according to the <B>-stateB> option; it can be made to appear raised, sunken, or flat; and it can be made to flash. When a user invokes the button (by pressing mouse button 1 with the cursor over the button), then the perl/Tk callback specified in the <B>-commandB> option is invoked.

WIDGET METHODS

The <B>ButtonB> method creates a widget object. This object supports the <B>configureB> and <B>cgetB> methods described in Tk::options which can be used to enquire and modify the options described above. The widget also inherits all the methods provided by the generic Tk::Widget class.

The following additional methods are available for button widgets:
$button-><B>flashB> Flash the button. This is accomplished by redisplaying the button several times, alternating between active and normal colors. At the end of the flash the button is left in the same normal/active state as when the command was invoked. This command is ignored if the button’s state is <B>disabledB>.
$button-><B>invokeB> Invoke the callback associated with the buttons <B>-commandB> option, if there is one. The return value is the return value from the callback, or the undefined value if there is no callback associated with the button. This command is ignored if the button’s state is <B>disabledB>.

DEFAULT BINDINGS

Tk automatically creates class bindings for buttons that give them default behavior:
[1] A button activates whenever the mouse passes over it and deactivates whenever the mouse leaves the button. Under Windows, this binding is only active when mouse button 1 has been pressed over the button.
[2] A button’s relief is changed to sunken whenever mouse button 1 is pressed over the button, and the relief is restored to its original value when button 1 is later released.
[3] If mouse button 1 is pressed over a button and later released over the button, the button is invoked. However, if the mouse is not over the button when button 1 is released, then no invocation occurs.
[4] When a button has the input focus, the space key causes the button to be invoked.

If the button’s state is <B>disabledB> then none of the above actions occur: the button is completely non-responsive.

The behavior of buttons can be changed by defining new bindings for individual widgets or by redefining the class bindings.

KEYWORDS

button, widget
Search for    or go to Top of page |  Section 3 |  Main Index


perl v5.20.3 BUTTON (3) 2015-01-31

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.