druid 0.4.0

Data-oriented Rust UI design 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.

use druid::widget::{Flex, Padding, Radio, RadioGroup, SizedBox};
use druid::{AppLauncher, Data, Widget, WindowDesc};

#[derive(Clone, PartialEq, Data)]
enum Choice {
    A,
    B,
    C,
    D,
}

fn build_widget() -> impl Widget<Choice> {
    Flex::column()
        .with_child(
            Padding::new(5.0, Radio::new("First choice", Choice::A)),
            0.0,
        )
        .with_child(
            Padding::new(5.0, Radio::new("Second choice", Choice::B)),
            0.0,
        )
        .with_child(
            Padding::new(5.0, Radio::new("Worst choice", Choice::C)),
            0.0,
        )
        .with_child(Padding::new(5.0, Radio::new("Best choice", Choice::D)), 0.0)
        .with_child(SizedBox::empty(), 1.0)
        .with_child(
            RadioGroup::new(vec![
                ("Good times", Choice::A),
                ("Ergonomics", Choice::B),
                ("No fourth choice!", Choice::C),
            ]),
            0.0,
        )
}

fn main() {
    let window = WindowDesc::new(build_widget);
    AppLauncher::with_window(window)
        .use_simple_logger()
        .launch(Choice::A)
        .expect("launch failed");
}