Button

Button widget extends the Tk button with new options. DynamicHelp options, a new relief style, callback for arm/disarm, and repeatdelay/repeatinterval options has been added.

WIDGET-SPECIFIC OPTIONS

-armcommand: Specifies a Tcl command to associate with the Button when mouse button 1 is pressed over the Button. When repeatdelay or repeatinterval option is positive integer, this command is repeatedly called if mouse pointer is over the Button and until mouse button 1 is released.

-command: Specifies a Tcl command to associate with the Button. This command is typically invoked when mouse button 1 is released over the Button window.

-default: Specifies one of three states for the default ring: normal, active, or disabled. 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.

-disarmcommand: Specifies a Tcl command to associate with the Button when mouse button 1 is released. This command is called even if pointer is not over the Button, and always before the command specified by command option. It is typically used in conjuntion with armcommand, repeatdelay and repeatinterval.

-height: 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; 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.

-helptext: Text for dynamic help. If empty, no help is available for this widget. See also DynamicHelp.

-helptype: Type of dynamic help. Use balloon or variable. See also DynamicHelp.

-helpvar: Variable to use when helptype option is variable. See also DynamicHelp.

-name: Specifies a standard name for the button. If the option *nameName is found in the resources database, then text and underline options are extracted from its value.

-relief: Specifies the 3-D effect desired for the widget. Acceptable values are standard values for button relief (raised, sunken, flat, ridge, solid, and groove) and link, which specifies that button relief is flat when pointer is outside the button and raised when pointer is inside.

-state: Specifies one of three states for the Button: normal, active, or disabled. In normal state the Button is displayed using the foreground and background options. The active state is typically used when the pointer is over the Button. In active state the Button is displayed using the activeforeground and activebackground 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 disabledforeground and background options determine how the Button is displayed.

-underline: Specifies the integer index of a character to underline in the label of the button. 0 corresponds to the first character of the text displayed, 1 to the next character, and so on.
The binding <Alt-char> is automatically set on the toplevel of the Button to call Button::setfocus.

-width: If an image or bitmap is being displayed in the Button then the value is in screen units; 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.

WIDGET COMMAND

pathName cget option: Returns the current value of the configuration option given by option. Option may have any of the values accepted by the creation command.

pathName configure ?option? ?value option value ...?: Query or modify the configuration options of the widget. If no option is specified, returns a list describing all of the available options for pathName. If option is specified with no value, then the command returns a list describing the one named option (this list will be identical to the corresponding sublist of the value returned if no option is specified). If one or more option-value pairs are specified, then the command modifies the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option may have any of the values accepted by the creation command. Read-only options are not be modified.

pathName invoke: If Button state is not disabled, this invoke the commands of the Button. Button is redisplayed with active color and sunken relief, and armcommand is called. Then Button is redisplayed with normal color and its defined relief, and disarmcommand then command are called.
invoke is called when Button has input focus and user press the space bar.