gtk4

Spice bindings for the GTK 4 GUI toolkit.

Installation

[dependencies]
gtk4 = "^0.1.0"

import "spice_packages/gtk4/gtk4";

The package links against the system GTK 4 library, so its development files have to be installed:

Platform	Package
Debian/Ubuntu	`libgtk-4-dev`
Fedora	`gtk4-devel`
macOS	`brew install gtk4`
Windows	GTK 4 from MSYS2 (add its `lib` dir to `LIBRARY_PATH`)

Quick start

Build the widget tree in code:

import "spice_packages/gtk4/gtk4";

p onYesClick(GtkWidget widget) {
    gPrint("Hello World!\n");
}

p onCancelClick(GtkWidget widget, GtkWindow window) {
    window.destroy();
}

p activate(GtkApplication app, GPointer data) {
    dyn window = app.newWindow();
    window.setTitle("Do you want to continue");
    window.setDefaultSize(350, 140);

    dyn box = GtkBox(GtkOrientation::Horizontal);
    box.setHAlign(GtkAlign::Center);
    box.setVAlign(GtkAlign::Center);
    window.setChild(box);

    dyn btnCancel = GtkButton("Cancel");
    btnCancel.setOnClickCallback(onCancelClick, window);
    box.append(btnCancel);

    dyn btnYes = GtkButton("Yes");
    btnYes.setOnClickCallback(onYesClick);
    box.append(btnYes);

    window.present();
}

f<int> main(int argc, string[] argv) {
    dyn app = GtkApplication("com.example.App");
    app.setActivateCallback(activate);
    return app.run(argc, argv);
}

Or load it from a GtkBuilder UI file:

p activate(GtkApplication app, GPointer data) {
    GtkBuilder builder;
    Result<bool> result = builder.addFromFile("window.ui");
    if result.isErr() {
        const Error& err = result.getErr();
        err.triggerPanic();
    }
    dyn window = builder.getObject<GtkWindow>("window");
    window.setApplication(app);

    dyn button = builder.getObject<GtkButton>("button");
    button.setOnClickCallback(onYesClick);

    window.setVisible();
}

API

Type	Members
`GtkApplication`	`GtkApplication(applicationId, flags)`, `setActivateCallback`, `run`, `newWindow`
`GtkWindow`	`setTitle`, `setDefaultSize`, `setChild`, `setApplication`, `present`, `setVisible`, `close`, `destroy`
`GtkBox`	`GtkBox(orientation, spacing)`, `append`, `setHAlign`, `setVAlign`
`GtkButton`	`GtkButton(label)`, `setOnClickCallback(callback)`, `setOnClickCallback(callback, data)`
`GtkWidget`	`setHAlign`, `setVAlign`
`GtkBuilder`	`addFromFile`, `getObject<T>`
`gPrint`	Print through GLib's `g_print`

The bindings cover a small part of GTK. Contributions for more widgets are welcome.