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GTK::Simple is a set of simple GTK 3 bindings using NativeCall. Only some GTK widgets are currently implemented. However, these are enough to create a reasonable interactive GUI for an idiomatic Raku program.

The GTK Widgets in this distribution include the following:

ActionBarGroup multiple buttons and arrange in 'left', 'middle', and 'right'
ButtonA simple button with a label and a callback
CalendarA calendar for selecting a date
CheckButtonA check button with a label
CheckMenuItemA checkable menu item
ComboBoxTextA simple combo box
DrawingAreaA drawing area (requires the 'Cairo' module)
EntryAllows for text to be provided by the user
FileChooserButtonA button that opens a file chooser dialog
FrameA bin with a decorative frame and optional label
GridA table-like container for widgets for window design
LabelAdds a line of text
LevelBarA bar that can used as a level indicator
LinkButtonCreate buttons bound to a URL
ListBoxA vertical listbox where each row is selectable
MarkUpLabelAdds text with GTK mark up (e.g. color and font manipulation)
MenuA simple menu with a menu item label
MenuBarA simple menu bar that contain one or more menus
MenuItemA simple menu item that can have a sub menu
MenuToolButtonA menu tool button with a label or an icon
PlacesSidebarSidebar that displays frequently-used places in the file system
ProgressBarShow progress via a filling bar
ScaleAllows for a number to be provided by the user
ScrolledWindowContainer for widgets needing scrolling, eg., multiline texts
RadioButtonA choice from multiple radio buttons
SpinnerShowing that something is happening
TextViewAdds multiple lines of text
ToggleButtonA toggle-able button
ToolbarA tool bar that can contain one or more menu tool buttons
VBox, HBoxWidget containers which enable window layout design


use GTK::Simple;

my $app = GTK::Simple::App.new( title => "Hello GTK!" );

        my $button = GTK::Simple::Button.new(label => "Hello World!"),
        my $second = GTK::Simple::Button.new(label => "Goodbye!")

$app.border-width = 20;
$second.sensitive = False;
$button.clicked.tap({ .sensitive = False; $second.sensitive = True });
$second.clicked.tap({ $app.exit; });

Using :subs option

Another approach is to specify :subs on import. This provides subroutine aliases for the constructors of all of the available GTK::Simple widgets, converted from CamelCase to kebab-case.

GTK::Simple::MenuToolButton becomes menu-tool-button, GTK::Simple::ProgressBar becomes progress-bar, etc.

The above example can be equivalently written as:

use GTK::Simple :subs;

my $app = app(title => "Hello GTK!");

        my $button1 = button(label => "Hello World"),
        my $button2 = button(label => "Goodbye!")

# ...

Further examples

The first four examples were written as mini tutorials to show how the system works:

For more examples, please see the examples/ folder.


The full functionality of GTK 3 is not available in this module.


This module requires the GTK3 library to be installed. Please follow the instructions below based on your platform:

Debian Linux

sudo apt-get install libgtk-3-dev

Mac OS X

brew update
brew install gtk+3


The GTK team describes how to do this for Windows at Setting up GTK for Window

Installation and sanity tests

Use the zef package manager

$ zef install GTK::Simple


Jonathan Worthington, jnthn on #raku, https://github.com/jnthn/


The Raku team


The Artistic License 2.0