druid-shell 0.3.2

Platform abstracting application shell used for druid toolkit.
Documentation 
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// Copyright 2019 The xi-editor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! GTK implementation of runloop.

use std::cell::RefCell;

use gio::{ApplicationExt, ApplicationExtManual, ApplicationFlags, Cancellable};
use gtkrs::{Application, GtkApplicationExt};

use crate::util::assert_main_thread;

// XXX: The application needs to be global because WindowBuilder::build wants
// to construct an ApplicationWindow, which needs the application, but
// WindowBuilder::build does not get the RunLoop
thread_local!(
    static GTK_APPLICATION: RefCell<Option<Application>> = RefCell::new(None);
);

/// Container for a GTK runloop
pub struct RunLoop {}

impl RunLoop {
    pub fn new() -> RunLoop {
        assert_main_thread();

        // TODO: we should give control over the application ID to the user
        let application = Application::new(
            Some("com.github.xi-editor.druid"),
            ApplicationFlags::FLAGS_NONE,
        )
        .expect("Unable to create GTK application");

        application.connect_activate(|_app| {
            eprintln!("Activated application");
        });

        application
            .register(None as Option<&Cancellable>)
            .expect("Could not register GTK application");

        GTK_APPLICATION.with(move |x| *x.borrow_mut() = Some(application));

        RunLoop {}
    }

    pub fn run(&mut self) {
        assert_main_thread();

        // TODO: should we pass the command line arguments?
        GTK_APPLICATION.with(|x| {
            x.borrow()
                .as_ref()
                .unwrap() // Safe because we initialized this in RunLoop::new
                .run(&[])
        });
    }
}

/// Request to quit the application, exiting the runloop.
pub fn request_quit() {
    assert_main_thread();
    with_application(|app| {
        match app.get_active_window() {
            None => {
                // no application is running, main is not running
            }
            Some(_) => {
                // we still have an active window, close the runLo
                gtk::main_quit();
            }
        }
    });
}

#[inline]
pub(crate) fn with_application<F, R>(f: F) -> R
where
    F: std::ops::FnOnce(Application) -> R,
{
    assert_main_thread();
    GTK_APPLICATION.with(move |app| {
        let app = app
            .borrow()
            .clone()
            .expect("Tried to manipulate the application before RunLoop::new was called");
        f(app)
    })
}

impl Default for RunLoop {
    fn default() -> Self {
        RunLoop::new()
    }
}