ttk::style(n) Tk Themed Widget ttk::style(n)

ttk::style - Manipulate style database

ttk::style option ?args?

See also the Tcl'2004 conference presentation, available at

Each widget is assigned a style, which specifies the set of elements making up the widget and how they are arranged, along with dynamic and default settings for element options. By default, the style name is the same as the widget's class; this may be overridden by the -style option.

A theme is a collection of elements and styles which controls the overall look and feel of an application.

The ttk::style command takes the following arguments:

Sets the default value of the specified option(s) in style.
Creates a new element in the current theme of type type. The only cross-platform built-in element type is image (see ttk_image(n)) but themes may define other element types (see Ttk_RegisterElementFactory). On suitable versions of Windows an element factory is registered to create Windows theme elements (see ttk_vsapi(n)).
Returns the list of elements defined in the current theme.
Returns the list of element's options.
Define the widget layout for style style. See LAYOUTS below for the format of layoutSpec. If layoutSpec is omitted, return the layout specification for style style.
Returns the value specified for -option in style style in state state, using the standard lookup rules for element options. state is a list of state names; if omitted, it defaults to all bits off (the “normal” state). If the default argument is present, it is used as a fallback value in case no specification for -option is found.
Sets dynamic values of the specified option(s) in style. Each statespec / value pair is examined in order; the value corresponding to the first matching statespec is used.
Creates a new theme. It is an error if themeName already exists. If -parent is specified, the new theme will inherit styles, elements, and layouts from the parent theme basedon. If -settings is present, script is evaluated in the context of the new theme as per ttk::style theme settings.
Returns a list of all known themes.
Temporarily sets the current theme to themeName, evaluate script, then restore the previous theme. Typically script simply defines styles and elements, though arbitrary Tcl code may appear.
Without an argument the result is the name of the current theme. Otherwise this command sets the current theme to themeName, and refreshes all widgets.

A layout specifies a list of elements, each followed by one or more options specifying how to arrange the element. The layout mechanism uses a simplified version of the pack geometry manager: given an initial cavity, each element is allocated a parcel. Then the parcel actually used by the element is adjusted within the allocated parcel. Valid options are:

Specifies a list of elements to place inside the element.
Specifies whether the allocated parcel is the entire cavity. If so, simultaneous specification of -side is ignored. Defaults to 0.
Specifies which side of the cavity to place the element; one of left, right, top, or bottom. For instance, -side top allocates the parcel along the top of the cavity having width and height respectively the width of the cavity and the height of the element. If omitted, the allocated parcel is the entire cavity (same effect as -expand 1).
Specifies the actual parcel position and size inside the allocated parcel. If specified as an empty string then the actual parcel is centered in the allocated parcel. Default is nswe.

For example:

ttk::style layout Horizontal.TScrollbar {
    Scrollbar.trough -children {
        Scrollbar.leftarrow -side left
        Scrollbar.rightarrow -side right
        Horizontal.Scrollbar.thumb -side left -sticky ew

ttk::intro(n), ttk::widget(n), photo(n), ttk_image(n)

style, theme, appearance

8.5 Tk