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::{Align, Flex, Label, Padding, Parse, TextBox};
use druid::{AppLauncher, Widget, WindowDesc};

fn main() {
    let main_window = WindowDesc::new(ui_builder);
    let data = Some(0);
    AppLauncher::with_window(main_window)
        .use_simple_logger()
        .launch(data)
        .expect("launch failed");
}

fn ui_builder() -> impl Widget<Option<u32>> {
    let label = Label::new(|data: &Option<u32>, _env: &_| {
        data.map_or_else(|| "Invalid input".into(), |x| x.to_string())
    });
    let input = Parse::new(TextBox::new());

    let mut col = Flex::column();
    col.add_child(Align::centered(Padding::new(5.0, label)), 1.0);
    col.add_child(Padding::new(5.0, input), 1.0);
    col
}