Widget functions return an instance of Gtk.Widget. Most common widgets are subclassed and have a few additional properties.

These widgets have some additional properties on top of the base Gtk.Widget ones:

Property	Type	Description
class-name	string	List of class CSS selectors separated by white space.
class-names	Array<string>	List of class CSS selectors.
css	string	Inline CSS. e.g label { color: white; }. If no selector is specified * will be assumed. e.g color: white; will be inferred as *{ color: white; }.
hpack	string	Horizontal alignment, behaves like halign. halign takes an enum, but for convenience hpack can be given with a string, so one of "start", "center", "end", "fill".
vpack	string	Vertical alignment.
cursor	string	Cursor style when hovering over widgets that have hover states, e.g it won't work on labels. list of valid values.
attribute	any	Any additional attributes on self
setup	(self) => void	A callback function to execute on self

Setup property

setup is a convenience prop to have imperative code inside declarative blocks

without setup

function MyWidget() {
  const self = Widget.Button();
  // imperative code
  return self;
}
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using setup

const MyWidget = () =>
  Widget.Button({
    setup: (self) => {
      // imperative code
    },
  });
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Attribute property

for attaching additional attributes on widgets Object.assign or the attribute property can be used

function MyWidget() {
  const self = Widget.Button();
  return Object.assign(self, {
    myPrimitiveProperty: "anything",
    myObjectProperty: {
      something: "anything",
      key: "value",
    },
  });
}

const mywidget = MyWidget();
console.log(mywidget.myPrimitiveProperty); // anything
console.log(mywidget.myObjectProperty); // { something: "anything", key: "value" }
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using attribute has the benefit of it being a gobject which means it will signal notify::attribute when it changes

const MyWidget = () =>
  Widget.Button({
    attribute: "anything",
    setup: (self) =>
      self.on("notify::attribute", () => {
        console.log(mywidget.attribute);
      }),
  });

const mywidget = MyWidget();
console.log(mywidget.attribute); // anything

// this line will invoke the above console.log in the setup
mywidget.attribute = "something else";
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keep in mind that attribute will only signal if its value changes

const MyWidget = () =>
  Widget.Button({
    attribute: {
      someKey: "value",
      key: "value",
    },
    setup: (self) =>
      self.on("notify::attribute", () => {
        console.log(mywidget.attribute);
      }),
  });

const mywidget = MyWidget();

// this line won't signal, because the attribute is still the same object
mywidget.attribute.key = "new value";

// to have it signal, assign a new object to it
mywidget.attribute = {
  ...mywidget.attribute,
  key: "new value",
};
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Common Gtk properties

Some common Gtk.Widget properties you might want for example

Property	Type	Description
hexpand	boolean	Expand horizontally.
vexpand	boolean	Expand vertically.
sensitive	boolean	Makes the widget interactable.
tooltip-text	string	Tooltip popup when the widget is hovered over.
visible	boolean	Visibility of the widget. Setting this to false doesn't have any effect if the parent container calls show_all(), for example when you set a Box's children dynamically.

toggleClassName

If you don't want to mutate the classNames array, there is toggleClassName: (name: string, enable: boolean) => void

const label = Widget.Label("example-label");

// add class name
label.toggleClassName("my-awesome-label", true);

// remove class name
label.toggleClassName("my-awesome-label", false);
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The properties listed here are just the additional properties on top of their base Gtk.Widget classes. Refer to the Gtk3 docs for the rest of them.

Window

subclass of Gtk.Window

the toplevel widget that holds everything

Property	Type	Description
child	Widget
name	string	Name of the window. This has to be unique, if you pass it in config. This will also be the name of the layer.
anchor	string[]	Valid values are "top", "bottom", "left", "right". Anchor points of the window. Leave it empty to make it centered.
exclusivity	string	Specify if the compositor should reserve space for the window automatically or how the window should interact with windows that do. Possible values: exclusive (space should be reserved), normal (the window should move if occluding another), ignore (the window should not be moved). Default: normal.
layer	string	Valid values are "overlay", "top", "bottom", "background". It is "top" by default.
margins	number[]	Corresponds to CSS notation: [TOP, RIGHT, BOTTOM, LEFT], also [0, 6] would have 0 margin on the top and bottom and would have 6 on the right and left.
monitor	number	Which monitor to show the window on. If it is left undefined the window will show on the currently focused monitor.
keymode	string	Valid values are "none", "on-demand": can receive keyboard input if focused, "exclusive": steal keyboard input on top and overlay layers
gdkmonitor	Gdk.Monitor	alternative to monitor

const window = Widget.Window({
  name: "window-name",
  anchor: ["top", "left", "right"],
  exclusivity: "normal",
  keymode: "on-demand",
  layer: "top",
  margins: [0, 6],
  monitor: 0,
  child: Widget.Label("hello"),
});
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Box

subclass of Gtk.Box

the main container widget

Property	Type	Description
vertical	bool	setting vertical: true is the same as orientation: 1
children	Widget[]	List of child widgets.

const box = Widget.Box({
  spacing: 8,
  homogeneous: false,
  vertical: false,
  children: [
    // widgets
  ],
});
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Button

subclass of Gtk.Button

on-clicked will be executed on Enter if the button and its window has focus

Property	Type
child	Widget
on-clicked	() => void
on-primary-click	(event: Gdk.Event) => boolean
on-secondary-click	(event: Gdk.Event) => boolean
on-middle-click	(event: Gdk.Event) => boolean
on-primary-click-release	(event: Gdk.Event) => boolean
on-secondary-click-release	(event: Gdk.Event) => boolean
on-middle-click-release	(event: Gdk.Event) => boolean
on-hover	(event: Gdk.Event) => boolean
on-hover-lost	(event: Gdk.Event) => boolean
on-scroll-up	(event: Gdk.Event) => boolean
on-scroll-down	(event: Gdk.Event) => boolean

const button = Widget.Button({
  child: Widget.Label("click me!"),
  onClicked: () => print("hello"),
});
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Calendar

subclass of Gtk.Calendar

Property	Type	Description
date	[number, number, number]	readonly [year, month, day]
detail	(number, number, number) => string | null
on-day-selected	() => void

const calendar = Widget.Calendar({
  showDayNames: true,
  showDetails: true,
  showHeading: true,
  showWeekNumbers: true,
  detail: (self, y, m, d) => {
    return `<span color="white">${y}. ${m}. ${d}.</span>`;
  },
  onDaySelected: ({ date: [y, m, d] }) => {
    print(`${y}. ${m}. ${d}.`);
  },
});
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CenterBox

subclass of Gtk.Box

Property	Type	Description
vertical	bool	setting vertical: true is the same as orientation: 1
start-widget	Gtk.Widget
center-widget	Gtk.Widget
end-widget	Gtk.Widget

const centerBox = Widget.CenterBox({
  spacing: 8,
  vertical: false,
  startWidget: Widget.Label("left widget"),
  centerWidget: Widget.Label("center widget"),
  endWidget: Widget.Label("right widget"),
});
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CircularProgress

subclass of Gtk.Bin

Property	Type	Description
start-at	number	Number between 0 and 1, e.g 0.75 is the top
end-at	number	Number between 0 and 1
inverted	boolean
rounded	boolean	Wether the progress bar should have rounded ends
value	number	Number between 0 and 1

const progress = Widget.CircularProgress({
  css: "min-width: 50px;" + // its size is min(min-height, min-width)
    "min-height: 50px;" +
    "font-size: 6px;" + // to set its thickness set font-size on it
    "margin: 4px;" + // you can set margin on it
    "background-color: #131313;" + // set its bg color
    "color: aqua;", // set its fg color
  rounded: false,
  inverted: false,
  startAt: 0.75,
  value: battery.bind("percent").as((p) => p / 100),
  child: Widget.Icon({
    icon: battery.bind("icon-name"),
  }),
});
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ColorButton

subclass of Gtk.ColorButton

Property	Type
on-color-set	() => void

const colorbutton = Widget.ColorButton({
  onColorSet: ({ rgba: { red, green, blue, alpha } }) => {
    print(`rgba(${red * 255}, ${green * 255}, ${blue * 255}, ${alpha})`);
  },
});
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DrawingArea

subclass of Gtk.DrawingArea

Property	Type
draw-fn	(cr: Cairo.Context, width: number, height: number) => void

const drawingarea = Widget.DrawingArea({
  widthRequest: 50,
  heightRequest: 50,
  drawFn: (self, cr, w, h) => {
    const center = {
      x: w / 2,
      y: h / 2,
    };

    cr.setSourceRGBA(1, 1, 1, 1);
    cr.setLineWidth(8);
    cr.arc(center.x, center.y, 2, 0, Math.PI * 2);
    cr.stroke();
  },
});
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Entry

subclass of Gtk.Entry

Property	Type
on-change	() => void
on-accept	() => void

const entry = Widget.Entry({
  placeholder_text: "type here",
  text: "initial text",
  visibility: true, // set to false for passwords
  onAccept: ({ text }) => print(text),
});
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EventBox

subclass of Gtk.EventBox

Property	Type
child	Widget
on-primary-click	(event: Gdk.Event) => boolean
on-secondary-click	(event: Gdk.Event) => boolean
on-middle-click	(event: Gdk.Event) => boolean
on-primary-click-release	(event: Gdk.Event) => boolean
on-secondary-click-release	(event: Gdk.Event) => boolean
on-middle-click-release	(event: Gdk.Event) => boolean
on-hover	(event: Gdk.Event) => boolean
on-hover-lost	(event: Gdk.Event) => boolean
on-scroll-up	(event: Gdk.Event) => boolean
on-scroll-down	(event: Gdk.Event) => boolean

FileChooserButton

subclass of Gtk.FileChooserButton

Property	Type	Description
on-file-set	() => void
uri	() => void	convenience getter for get_uri
uris	() => void	convenience getter for get_uris

const fbutton = Widget.FileChooserButton({
  onFileSet: ({ uri }) => {
    print(uri);
  },
});
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Fixed

subclass of Gtk.Fixed

const fixed = Widget.Fixed({
  setup(self) {
    self.put(Widget.Label("hello"), 0, 0);
    self.put(Widget.Label("hello"), 50, 50);
  },
});
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FlowBox

subclass of Gtk.FlowBox

const flowbox = Widget.FlowBox({
  setup(self) {
    self.add(Widget.Label("hello"));
  },
});
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FontButton

subclass of Gtk.FontButton

Property	Type	Description
on-font-set	() => void

const fontbutton = Widget.FontButton({
  onFontSet: ({ font }) => {
    print(font);
  },
});
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Icon

subclass of Gtk.Image

Property	Type	Description
icon	string	Name of an icon or path to a file
size	number	Forced size

Widget.Icon({ icon: "dialog-information-symbolic" });

// if you only want an icon, it can be shortened like this
Widget.Icon("dialog-information-symbolic");

// if you don't set a size, it will be computed from css font-size
Widget.Icon({
  icon: "dialog-information-symbolic",
  css: "font-size: 30px",
});

// NOTE:
// setting the icon dynamically has a flicker currently
// to fix it, use a forced size
Widget.Icon({
  icon: "dialog-information-symbolic",
  size: 30,
});
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Label

subclass of Gtk.Label

Property	Type	Description
justification	string	Valid values are "left", "center", "right", "fill". Same as justify but represented as a string instead of enum.
truncate	string	Valid values are "none", "start", "middle", "end". Same as ellipsize but represented as a string instead of enum.

const label = Widget.Label({
  label: "some text to show",
  justification: "left",
  truncate: "end",
  xalign: 0,
  maxWidthChars: 24,
  wrap: true,
  useMarkup: true,
});

// shorthand for { label: 'hello' }
Widget.Label("hello");
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LevelBar

subclass of Gtk.LevelBar

Property	Type	Description
bar-mode	string	Valid values are "continuous", "discrete". Same as mode but represented as a string instead of enum.
vertical	bool	setting vertical: true is the same as orientation: 1

const continuous = Widget.LevelBar({
  widthRequest: 100,
  value: battery.bind("percent").as((p) => p / 100),
});

const discrete = Widget.LevelBar({
  widthRequest: 100,
  bar_mode: "discrete",
  max_value: 10,
  value: battery.bind("percent").as((p) => p / 10),
});
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ListBox

subclass of Gtk.ListBox

const listbox = Widget.ListBox({
  setup(self) {
    self.add(Widget.Label("hello"));
  },
});
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Menu

subclass of Gtk.Menu

Property	Type
children	MenuItem[]
on-popup	(flipped_rect: void, final_rect: void, flipped_x: boolean, flipped_y: boolean) => void
on-move-scroll	(scroll_type: Gtk.ScrollType) => void

function RightClickMenu() {
  const menu = Widget.Menu({
    children: [
      Widget.MenuItem({
        child: Widget.Label("hello"),
      }),
    ],
  });

  return Widget.Button({
    on_primary_click: (_, event) => {
      menu.popup_at_pointer(event);
    },
  });
}
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MenuBar

subclass of Gtk.MenuBar

const menubar = Widget.MenuBar({
  setup: (self) => {
    self.append(Widget.Menu());
  },
});
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MenuItem

subclass of Gtk.MenuItem

Property	Type
child	Widget
on-activate	() => boolean
on-select	() => boolean
on-deselect	() => boolean

const menu = Widget.Menu({
  children: [
    Widget.MenuItem({
      child: Widget.Label("hello"),
      onActivate: () => {
        print("clicked");
      },
    }),
  ],
});
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Overlay

subclass of Gtk.Overlay Takes the size of its first child, then places subsequent children on top of each other and won't render them outside the container.

Property	Type	Description
child	Widget	Child which will determine the size of the overlay
overlays	Widget[]	Overlayed children
pass-through	boolean	Whether the overlay childs should pass the input through

ProgressBar

subclass of Gtk.ProgressBar

Property	Type	Description
vertical	bool	Setting vertical: true is the same as orientation: 1
value	number	Same as ProgressBar.fraction

const progressbar = Widget.ProgressBar({
  value: battery.bind("percent").as((p) => p / 100),
});
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Revealer

subclass of Gtk.Revealer

Property	Type	Description
child	Widget
transition	string	Valid values are "none", "crossfade", "slide_left", "slide_right", "slide_down", "slide_up". This is transitionType represented as a string instead of enum.

const revealer = Widget.Revealer({
  revealChild: false,
  transitionDuration: 1000,
  transition: "slide_right",
  child: Widget.Label("hello!"),
  setup: (self) =>
    self.poll(2000, () => {
      self.reveal_child = !self.reveal_child;
    }),
});
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Scrollable

subclass of Gtk.ScrolledWindow

Property	Type	Description
child	Widget
hscroll	string	Valid values are "always, "automatic", "external", "never".
vscroll	string	Valid values are "always, "automatic", "external", "never".

const scrollable = Widget.Scrollable({
  hscroll: "always",
  vscroll: "never",
  css: "min-width: 20px;",
  child: Widget.Label(
    "Lorem ipsum dolor sit amet, " +
      "officia excepteur ex fugiat reprehenderit enim " +
      "labore culpa sint ad nisi Lorem pariatur mollit",
  ),
});
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Separator

subclass of Gtk.Separator

Property	Type	Description
vertical	bool	Setting vertical: true is the same as orientation: 1

const separator = Widget.Separator({
  vertical: false,
});
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Slider

subclass of Gtk.Scale

Property	Type	Description
vertical	bool	Setting vertical: true is the same as orientation: 1
value	number
min	number
max	number
marks	tuple or number	where tuple is [number, string?, Position?], Position is "top", "left, "right, "bottom"
on-change	(event: Gdk.Event) => void

Widget.Slider({
  onChange: ({ value }) => print(value),
  vertical: true,
  value: 0,
  min: 0,
  max: 1,
  marks: [
    1,
    2,
    [3, "label"],
    [4, "label", "bottom"],
  ],
});
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SpinButton

subclass of Gtk.SpinButton

Property	Type
on-value-changed	() => void
range	[min: number, max: number]
increments	[step: number, page: number]

const spinbutton = Widget.SpinButton({
  range: [0, 100],
  increments: [1, 5],
  onValueChanged: ({ value }) => {
    print(value);
  },
});
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Spinner

subclass of Gtk.Spinner spinning icon showing that something is loading

const spinner = Widget.Spinner();
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Stack

subclass of Gtk.Stack

Property	Type	Description
children	{ [string]: Widget }	name, Widget key-value pairs
shown	string	Name of the widget to show. This can't be set on construction, instead the first given widget will be shown.
transition	string	transitionType represented as a string. Valid values are none, crossfade, slide_right, slide_left, slide_up, slide_down, slide_left_right, slide_up_down, over_up, over_down, over_left, over_right, under_up, under_down, under_left, under_right, over_up_down, over_down_up, over_left_right, over_right_left

const stack = Widget.Stack({
  children: {
    "child1": Widget.Label("first child"),
    "child2": Widget.Label("second child"),
  },
  shown: "child2",
});
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Switch

subclass of Gtk.Switch

Property	Type
on-activate	() => void

const switch = Widget.Switch({
    onActivate: ({ active }) => print(active),
})
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ToggleButton

subclass of Gtk.ToggleButton

Property	Type
on-toggled	() => void

const togglebutton = Widget.ToggleButton({
  onToggled: ({ active }) => print(active),
});
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