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# Widget
## Gtk3
### Additional widget properties
These are properties that Astal additionally adds to Gtk.Widgets
- className: `string` - List of class CSS selectors separated by white space.
- 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; }`.
- cursor: `string` - Cursor style when hovering over widgets that have hover states, e.g it won't work on labels. [list of valid values](https://docs.gtk.org/gdk3/ctor.Cursor.new_from_name.html).
- clickThrough: `boolean` - Lets click events through.
To have a full list of available properties, reference the documentation of the widget.
- [Astal3 widgets](https://aylur.github.io/libastal/astal3/index.html#classes)
- [Gtk widgets](https://docs.gtk.org/gtk3/#classes)
### Additional widget methods
#### setup
`setup` is a convenience prop to remove the need to predefine widgets
before returning them in cases where a reference is needed.
without `setup`
```tsx
function MyWidget() {
const button = Widget.Button()
// setup button
return button
}
```
using `setup`
```tsx
function MyWidget() {
function setup(button: Widget.Button) {
// setup button
}
return <buttons setup={setup} />
}
```
#### hook
Shorthand for connection and disconnecting to [Subscribable and Connectable](./binding#subscribable-and-connectable-interface) objects.
without `hook`
```tsx
function MyWidget() {
const id = gobject.connect("signal", callback)
const unsub = variable.subscribe(callback)
return <box
onDestroy={() => {
gobject.disconnect(id)
unsub()
}}
/>
}
```
with `hook`
```tsx
function MyWidget() {
return <box
setup={(self) => {
self.hook(gobject, "signal", callback)
self.hook(variable, callback)
}}
/>
}
```
#### toggleClassName
Toggle classNames based on a condition
```tsx
function MyWidget() {
return <box
setup={(self) => {
self.toggleClassName("classname", someCondition)
}}
/>
}
```
### How to use non builtin Gtk widgets
Using the `Widget.astalify` mixin you can subclass widgets
to behave like builtin widgets.
The `astalify` mixin will apply the following:
- set `visible` to true by default (Gtk3 widgets are invisible by default)
- make gobject properties accept and consume `Binding` objects
- add properties and methods listed above
- sets up signal handlers that are passed as props prefixed with `on`
```tsx
import GObject from "gi://GObject"
import { Gtk, Gdk, Widget, astalify, type ConstructProps } from "astal/gtk3"
// subclass, register, define constructor props
class ColorButton extends astalify(Gtk.ColorButton) {
static { GObject.registerClass(this) }
constructor(props: ConstructProps<
ColorButton,
Gtk.ColorButton.ConstructorProps,
{ onColorSet: [] } // signals of Gtk.ColorButton have to be manually typed
>) {
super(props as any)
}
}
function MyWidget() {
function setup(button: ColorButton) {
}
return <ColorButton
setup={setup}
useAlpha
rgba={new Gdk.RGBA({
red: 1,
green: 0,
blue: 0,
alpha: 0.5,
})}
onColorSet={(self) => {
console.log(self.rgba)
}}
/>
}
```
:::info
Signal properties have to be annotated manually for TypeScript.
You can reference [Gtk3](https://gjs-docs.gnome.org/gtk30~3.0/)
and [Astal](https://aylur.github.io/libastal/index.html#classes) for available signals.
:::
### TypeScript
Type of widgets are available through `Widget`.
Here is an example Widget that takes in and handles a possibly `Binding` prop.
```tsx
import { Binding, Variable } from "astal"
import { Widget } from "astal/gtk3"
export interface ToggleButtonProps extends Widget.ButtonProps {
onToggled?: (self: Widget.Button, on: boolean) => void
state?: Binding<boolean> | boolean
child?: JSX.Element
}
export default function ToggleButton(btnprops: ToggleButtonProps) {
const { state = false, onToggled, setup, child, ...props } = btnprops
const innerState = Variable(state instanceof Binding ? state.get() : state)
return <button
{...props}
setup={self => {
setup?.(self)
self.toggleClassName("active", innerState.get())
self.hook(innerState, () => self.toggleClassName("active", innerState.get()))
if (state instanceof Binding) {
self.hook(state, () => innerState.set(state.get()))
}
}}
onClicked={self => {
onToggled?.(self, !innerState.get())
}}
>
{child}
</button>
}
```
### Builtin Widgets
You can check the [source code](https://github.com/aylur/astal/blob/main/lang/gjs/src/gtk3/index.ts) to have a full list of builtin widgets.
These widgets are available by default in JSX.
- box: [Astal.Box](https://aylur.github.io/libastal/astal3/class.Box.html)
- button: [Astal.Button](https://aylur.github.io/libastal/astal3/class.Button.html)
- centerbox: [Astal.CenterBox](https://aylur.github.io/libastal/astal3/class.CenterBox.html)
- circularprogress: [Astal.CircularProgress](https://aylur.github.io/libastal/astal3/class.CircularProgress.html)
- drawingarea: [Gtk.DrawingArea](https://docs.gtk.org/gtk3/class.DrawingArea.html)
- entry: [Gtk.Entry](https://docs.gtk.org/gtk3/class.Entry.html)
- eventbox: [Astal.EventBox](https://aylur.github.io/libastal/astal3/class.EventBox.html)
- icon: [Astal.Icon](https://aylur.github.io/libastal/astal3/class.Icon.html)
- label: [Astal.Label](https://aylur.github.io/libastal/astal3/class.Label.html)
- levelbar: [Astal.LevelBar](https://aylur.github.io/libastal/astal3/class.LevelBar.html)
- overlay: [Astal.Overlay](https://aylur.github.io/libastal/astal3/class.Overlay.html)
- revealer: [Gtk.Revealer](https://docs.gtk.org/gtk3/class.Revealer.html)
- scrollable: [Astal.Scrollable](https://aylur.github.io/libastal/astal3/class.Scrollable.html)
- slider: [Astal.Slider](https://aylur.github.io/libastal/astal3/class.Slider.html)
- stack: [Astal.Stack](https://aylur.github.io/libastal/astal3/class.Stack.html)
- switch: [Gtk.Switch](https://docs.gtk.org/gtk3/class.Switch.html)
- window: [Astal.Window](https://aylur.github.io/libastal/astal3/class.Window.html)
## Gtk4
🚧 Work in Progress 🚧
|
