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Manpages checkbuttonSection: Tk Built-In Commands (n)Updated: 4.4 Index Return to Main Contents NAMEcheckbutton - Create and manipulate checkbutton widgetsSYNOPSIScheckbutton pathName ?options?STANDARD OPTIONS
-activebackground-cursor-highlightthickness-takefocus -activeforeground-disabledforeground-image-text -anchor -font-justify-textvariable -background-foreground-padx-underline -bitmap -highlightbackground-pady-wraplength -borderwidth-highlightcolor-relief See the options manual entry for details on the standard options. WIDGET-SPECIFIC OPTIONS[ -command command 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. The button's global variable (-variable option) will be updated before the command is invoked. [ -height height 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 (i.e. any of the forms acceptable to Tk_GetPixels); 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. [ -indicatoron indicatorOn IndicatorOn ] Specifies whether or not the indicator should be drawn. Must be a proper boolean value. If false, the relief option is ignored and the widget's relief is always sunken if the widget is selected and raised otherwise. [ -offvalue offValue Value ] Specifies value to store in the button's associated variable whenever this button is deselected. Defaults to ``0''. [ -onvalue onValue Value ] Specifies value to store in the button's associated variable whenever this button is selected. Defaults to ``1''. [ -selectcolor selectColor Background ] Specifies a background color to use when the button is selected. If indicatorOn is true then the color applies to the indicator. Under Windows, this color is used as the background for the indicator regardless of the select state. If indicatorOn is false, this color is used as the background for the entire widget, in place of background or activeBackground, whenever the widget is selected. If specified as an empty string then no special color is used for displaying when the widget is selected. [ -selectimage selectImage SelectImage ] Specifies an image to display (in place of the image option) when the checkbutton is selected. This option is ignored unless the image option has been specified. [ -state state State ] Specifies one of three states for the checkbutton: normal, active, or disabled. In normal state the checkbutton is displayed using the foreground and background options. The active state is typically used when the pointer is over the checkbutton. In active state the checkbutton is displayed using the activeForeground and activeBackground options. Disabled state means that the checkbutton 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 checkbutton is displayed. [ -variable variable Variable ] Specifies name of global variable to set to indicate whether or not this button is selected. Defaults to the name of the button within its parent (i.e. the last element of the button window's path name). [ -width width Width ] 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 Tk_GetPixels); 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.DESCRIPTIONThe checkbutton command creates a new window (given by the pathName argument) and makes it into a checkbutton widget. Additional options, described above, may be specified on the command line or in the option database to configure aspects of the checkbutton such as its colors, font, text, and initial relief. The checkbutton command returns its pathName argument. At the time this command is invoked, there must not exist a window named pathName, but pathName's parent must exist. A checkbutton is a widget that displays a textual string, bitmap or image and a square called an indicator. 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 wrapLength option) and one of the characters may optionally be underlined using the underline option. A checkbutton has all of the behavior of a simple button, including the following: it can display itself in either of three different ways, according to the state option; it can be made to appear raised, sunken, or flat; it can be made to flash; and it invokes a Tcl command whenever mouse button 1 is clicked over the checkbutton. In addition, checkbuttons can be selected. If a checkbutton is selected then the indicator is normally drawn with a selected appearance, and a Tcl variable associated with the checkbutton is set to a particular value (normally 1). Under Unix, the indicator is drawn with a sunken relief and a special color. Under Windows, the indicator is drawn with a check mark inside. If the checkbutton is not selected, then the indicator is drawn with a deselected appearance, and the associated variable is set to a different value (typically 0). Under Unix, the indicator is drawn with a raised relief and no special color. Under Windows, the indicator is drawn without a check mark inside. By default, the name of the variable associated with a checkbutton is the same as the name used to create the checkbutton. The variable name, and the ``on'' and ``off'' values stored in it, may be modified with options on the command line or in the option database. Configuration options may also be used to modify the way the indicator is displayed (or whether it is displayed at all). By default a checkbutton is configured to select and deselect itself on alternate button clicks. In addition, each checkbutton monitors its associated variable and automatically selects and deselects itself when the variables value changes to and from the button's ``on'' value. WIDGET COMMANDThe checkbutton command creates a new Tcl command whose name is pathName. This command may be used to invoke various operations on the widget. It has the following general form:
BINDINGSTk automatically creates class bindings for checkbuttons that give them the following default behavior:
If the checkbutton's state is disabled then none of the above actions occur: the checkbutton is completely non-responsive. The behavior of checkbuttons can be changed by defining new bindings for individual widgets or by redefining the class bindings. KEYWORDScheckbutton, widget
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