This provides webview functionality for embedded fltk windows.

Add fltk-webview to your fltk application's Cargo.toml file:

[dependencies]
fltk = "1"
fltk-webview = "0.4"

Then you can embed a webview using fltk_webview::Webview::create:

use fltk::{app, prelude::*, window};
use fltk_webview::*;

fn main() {
    let app = app::App::default();
    let mut win = window::Window::default()
        .with_size(800, 600)
        .with_label("Webview");
    let mut wv_win = window::Window::default()
        .with_size(790, 590)
        .center_of_parent();
    win.end();
    win.make_resizable(true);
    win.show();

    let mut wv = Webview::create(false, &mut wv_win);
    wv.navigate("https://google.com");
    
    app.run().unwrap();
}

• fltk-rs's dependencies, which can be found here.
• On Windows: No other dependencies.
• On MacOS: No other dependencies.
• On X11/wayland platforms, webkit2gtk:
  • Debian-based distros: sudo apt-get install libwebkit2gtk-4.1-dev.
  • RHEL-based distros: sudo dnf install webkit2gtk3-devel.

The situation on linux is quite bad. It depends on whether you're running X11 or wayland. On wayland, this will use xwayland. On X11, I can't get embedding to work on Gnome's mutter window manager, which keeps fighting for ownership of the webview window, causing flickering or a blank screen!D=x11 environment variable for webkit2gtk to work properly.