#r "nuget: GirCore.Gtk-4.0,0.5.0"
open System
open Gtk
let label () =
let label = new Label()
label.SetText "hello"
label
let button (label: Label) =
let button = new Button()
button.SetLabel "click me"
let mutable counter = 0
let clickHnd (_: Button) (_: EventArgs) =
label.SetText $"hello {counter}"
counter <- counter + 1
button.add_OnClicked (new GObject.SignalHandler<Button>(clickHnd))
button
let box () =
let box = new Box()
box.SetOrientation Orientation.Vertical
box.SetHomogeneous true
let l = label ()
box.Append l
button l |> box.Append
box
let onActivateApp (sender: Gio.Application) (_: EventArgs) =
let window = ApplicationWindow.New(sender :?> Application)
window.Title <- "Gtk4 Window"
window.SetDefaultSize(300, 300)
window.SetChild(box ())
window.Show()
let application = Application.New("org.gir.core", Gio.ApplicationFlags.FlagsNone)
application.add_OnActivate (new GObject.SignalHandler<Gio.Application>(onActivateApp))
application.RunWithSynchronizationContext(null)
The above code does the following:
- creates a 300px × 300px window with GTK4
- the window title is "Gtk4 Window"
- it has a button and a label controls
- when clicking the button the label text changes to show the value of a counter that increases with each click
Notice the code is an F# script, which means it doesn't need a main function and can run by putting the code in an .fsx file and then running it with dotnet fsi your_file.fsx
Is there any advantage of using GTK instead of something like Avalonia?