ttk::toggleswitch manual page

A ttk::toggleswitch widget is used to show or change a binary setting. It consists of a horizontal trough (a fully rounded filled rectangle) and a slider (a filled circle or fully rounded filled rectangle contained in the trough). Their dimensions depend on the value of the -size configuration option, the current theme, the display's scaling level, and Tk's scaling factor given by [tk scaling] at the time the first toggleswitch widget is created.

Just like a light switch, a toggleswitch widget can have one of two possible switch states: on or off. In the on state the slider is placed at the end of the trough, and in the off state at its beginning. The user can toggle between these two states with the mouse or the space key.

The colors used when drawing the trough and slider in the various widget states depend on the current theme. If the theme is aqua then they also depend on the system appearance (light mode or dark mode) and the accent color, and are automatically adapted whenever one of these global system settings changes.

The implementation creates these elements when needed with the aid of generic code for arbitrary themes and theme-specific one for a few built-in themes. Applications can add explicit support for any theme theme by providing an appropriate command of the name ttk::toggleswitch::CreateElements_theme.

STANDARD OPTIONS

-class, undefined, undefined
-cursor, cursor, Cursor
-style, style, Style
-takefocus, takeFocus, TakeFocus

The default value of the -class option is Toggleswitch. The value of the -style option defaults to Toggleswitch2, corresponding to the -size option's default value 2 (see below).

WIDGET-SPECIFIC OPTIONS

Command-Line Name: -command

Database Name: command

Database Class: Command

Specifies a Tcl script to be evaluated at global scope whenever the switch state of the widget is toggled (programmatically, by invoking the switchstate or toggle subcommand, or interactively). The default is an empty string.

Command-Line Name: -offvalue

Database Name: offValue

Database Class: OffValue

The value to store in the associated -variable when the widget's switch state is set to off. Defaults to 0.

Command-Line Name: -onvalue

Database Name: onValue

Database Class: OnValue

The value to store in the associated -variable when the widget's switch state is set to on. Defaults to 1.

Command-Line Name: -size

Database Name: size

Database Class: Size

Specifies the size identifier of the toggleswitch widget. The supported values are the strings 1, 2 (the default), and 3. In the case of the aqua theme, these size IDs correspond to the control sizes "mini", "small", and "large" of the native toggle switches on macOS.

Note that by setting this option to a value size, the -style option's value will automatically change to Toggleswitchsize if its previous or requested value was Toggleswitch1, Toggleswitch2, or Toggleswitch3, and to prefix.Toggleswitchsize if its previous or requested value was prefix.Toggleswitch1, prefix.Toggleswitch2, or prefix.Toggleswitch3. Conversely, by setting the -style option to a value of the form Toggleswitchsize or prefix.Toggleswitchsize (where size is one of 1, 2, or 3), the -size option will automatically be set to size. When configuring both options -size and -style, the former will take precedence over the latter, regardless of the order in which they were specified.

For example, if you create the widget with

ttk::toggleswitch pathName -size 3 -style My.Toggleswitch3

or invoke

pathName configure -style My.Toggleswitch3

then the -style option will be set to My.Toggleswitch3 (and the -size option will have the value 3). On the other hand, if you create the widget with

ttk::toggleswitch pathName -style My.Toggleswitch3

then the -style option will have the value My.Toggleswitch2 rather than My.Toggleswitch3, because the widget creation triggers the default -size 2 setting, which takes precedence over -style My.Toggleswitch3.

Command-Line Name: -variable

Database Name: variable

Database Class: Variable

The name of a global variable whose value is linked to the toggleswitch. The widget's switch state changes to on when this variable is set to the value specified by the -onvalue option and to off otherwise. Defaults to the widget's pathname if not specified.

Note that, just like in the case of the (ttk::)checkbutton, toggling the widget's switch state by changing the value of this variable will not cause the script specified by the -command option to get executed.

WIDGET COMMAND

In addition to the standard cget, configure, identify element, instate, state, and style commands (see ttk::widget), toggleswitch widgets support the following additional commands:

pathName switchstate ?boolean?

Modifies or inquires the widget's switch state. If the optional argument is present then it must be a boolean (a numeric value, where 0 is false and anything else is true, or a string such as true/yes/on or false/no/off). If the widget's disabled state flag is set then the command returns an empty string immediately after checking the argument. Otherwise, if the argument is true then the command sets the widget's switch state to on by setting its selected flag, moving the slider to the end of the trough, and setting the associated -variable to the value specified by the -onvalue option; if the argument is false then the command sets the widget's switch state to off by clearing the selected flag, moving the slider to the beginning of the trough, and setting the associated variable to the value specified by the -offvalue option.

If the argument's value causes the widget's switch state to get toggled and the script specified as the value of the -command option is a nonempty string then the command evaluates that script at global scope and returns its result; otherwise the return value is an empty string.

If the optional argument is not present then the command returns the widget's current switch state as 0 (off) or 1 (on). When a toggleswitch widget is created, its switch state is initialized with 0.

pathName toggle

This convenience subcommand toggles the widget's switch state. It is logically equivalent to invoking the switchstate command with the argument 0 if the current switch state is on and with the argument 1 otherwise.

INTERNAL COMMANDS

The following widget commands are used internally by the Toggleswitch widget class bindings. They provide a means to access the widget's internal value, which is a real number within a certain invariant interval.

pathName get ?min|max|x?: Returns the current/minimum/maximum internal value, or the one corresponding to the coordinate x relative to the widget origin if it is specified.
pathName set value: Sets the widget's internal value to value. The value will be clipped to the range given by the minimum and maximum values, as returned by get min and get max.

pathName xcoord ?value?: Returns the x coordinate corresponding to value, or to the current internal value if value is omitted.

DEFAULT BINDINGS

The toggleswitch widget's default bindings enable the following behavior.

If the current theme is aqua:

By pressing mouse button 1 over the slider and then dragging the mouse with button 1 down until the pointer enters the trough, the slider moves smoothly to the opposite edge of the trough and the widget's switch state gets toggled. The same happens if mouse button 1 is pressed outside the slider and then the pointer leaves the widget horizontally with button 1 down.
By pressing mouse button 1 anywhere within the widget and then releasing it over the widget without previously moving the slider, the latter moves smoothly to the opposite edge of the trough and the widget's switch state gets toggled.
When the widget has the input focus, the space key causes its switch state to get toggled.

If the current theme is different from aqua:

By pressing mouse button 1 anywhere within the widget and then dragging the mouse with button 1 down, the slider moves in the same (horizontal) direction as the pointer. By releasing the button, the switch state is set to off or on, depending on the slider's position relative to the middle of the widget.
By pressing mouse button 1 anywhere within the widget and then releasing it over the widget without previously dragging the mouse horizontally, the widget's switch state gets toggled.
When the widget has the input focus, the space key causes its switch state to get toggled.

If the widget's disabled state flag is set then none of the above actions occur.

WIDGET STATES

The widget sets the selected state whenever the switch state changes to on and clears it otherwise. The widget sets the invalid state whenever the linked -variable is unset. The defalt bindings set and clear the active and pressed state flags.

STYLING OPTIONS

The default class name for a ttk::toggleswitch is Toggleswitch.

Dynamic states: active, background, disabled, invalid, pressed, selected.

Toggleswitch1, Toggleswitch2, and Toggleswitch3 styling options configurable with ttk::style are:

-focuscolor color

The default is theme-specific.

-focussolid boolean

Defaults to true for the classic theme and false for all the others.

-focusthickness amount

The default is 1. The value may have any of the forms acceptable to Tk_GetPixels.

-padding padding

Defaults to 1.5p for the aqua theme (for which the three above-mentioned styles have no focus element) and 0.75p for all the other themes.

For the aqua theme only the -padding option is available, the others are simply ignored.

See the ttk_style manual page for information on how to configure ttk styles.

KEYWORDS

toggleswitch, trough, slider, widget