@pojntfx@mastodon.social avatar pojntfx , to random

New progress on the introspection things I'm working on in . It's super early, but I added preliminary support for generated getters/setters for properties. No more manual value setup & SetProperty calls required, just a simple SetPropertyX call. We're getting closer and closer to more readable code here with this IMHO, GJS on the right for comparison!

This code: vfunc_activate() { this.#window = new SenbaraGtk.MainApplicationWindow({ application: this, }); this.#window.connect("button-test-clicked", () => { console.log("Test button clicked"); this.#window.show_toast("Button was clicked!"); this.#window.test_button_sensitive = false; setTimeout(() => { this.#window.show_toast("Button re-enabled after 3 seconds"); this.#window.test_button_sensitive = true; }, 3000); }); this.#window.present(); }

This code: vfunc_activate() { this.#window = new SenbaraGtk.MainApplicationWindow({ application: this, }); this.#window.connect("button-test-clicked", () => { console.log("Test button clicked"); this.#window.show_toast("Button was clicked!"); this.#window.test_button_sensitive = false; setTimeout(() => { this.#window.show_toast("Button re-enabled after 3 seconds"); this.#window.test_button_sensitive = true; }, 3000); }); this.#window.present(); }
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@pojntfx@mastodon.social avatar pojntfx , to random

Continued some subclassing support in Go. Turns out I messed up the C memory alignment in for and ended up embedding the parent class as a reference, when GObject expects it to be the actual struct. Funnily enough some callbacks still worked before this, but now even the ones like Snapshot and Activate work. To demonstrate, here is a Go application subclassing AdwApplication and overwriting the activate callback instead of calling ConnectCallback!

An example application window with GTK inspector open, showing ExampleApplication as it's type.
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pojntfx OP ,
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@jwijenbergh Thank you! Your library has been so much fun to work with.

pojntfx OP , (edited )
@pojntfx@mastodon.social avatar

@jwh Oh, that is a great way to name it. Yk what, I'll be sure to adopt the same structure :)

@pojntfx@mastodon.social avatar pojntfx , (edited ) to random

Now that my PRs for subclassing support in Go are up on GitHub and ready for review, I can get started porting over Sessions to GSK instead of Cairo. It was easier to do find examples in JS, so that's what I used, but next up is getting this to work with the freshly implemented snapshot function override!

Sessions running with the GTK inspector open. A custom widget shows up in the inspector.
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pojntfx OP ,
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@federicomena Yup! The screenshot above is already using GSK :)

federicomena ,
@federicomena@mstdn.mx avatar

@pojntfx Got it, that's awesome. I had only seen the older post to which you linked, not the parent post.

@pojntfx@mastodon.social avatar pojntfx , (edited ) to random

May I present: Typed subclassing of classes in Golang! Still a WIP, but this is enough now to create proper custom widgets in without needing to import any purego/CGo code to subclass. Please ignore the Constructed callback call here, it's just there to test if getting a callback (e.g. a constructor works), too. 🥳

This source code, in VSCode: objClass.SetCallbackSetProperty(func(o *gobject.Object, u uint, v *gobject.Value, ps *gobject.ParamSpec) { switch u { case propertyIdTestButtonSensitive: w := (*senbaraGtkMainApplicationWindow)(unsafe.Pointer(o.GetData(dataKeyGoInstance))) w.buttonTest.SetSensitive(v.GetBoolean()) } }) objClass.SetCallbackGetProperty(func(o *gobject.Object, u uint, v *gobject.Value, ps *gobject.ParamSpec) { switch u { case propertyIdTestButtonSensitive: w := (*senbaraGtkMainApplicationWindow)(unsafe.Pointer(o.GetData(dataKeyGoInstance))) v.SetBoolean(w.buttonTest.IsSensitive()) } })
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jwh ,
@jwh@social.tchncs.de avatar

@pojntfx Very impressive!

pojntfx OP ,
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@jwh Thank you! The other GIR generation libraries, like the one you maintain, have been invaluable as references :)

@pojntfx@mastodon.social avatar pojntfx , (edited ) to random

Just got GTK subclassing to work in thanks to some new bindings by https://github.com/jwijenbergh 👀

GTK Inspector showing a GObject subclassing example in Go
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@agx@ruhr.social avatar agx , to random German

If you ever wanted to write a or plugin for but didn't fancy C: Here's an example in : https://gitlab.gnome.org/World/Phosh/phosh/-/merge_requests/1727