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::{Button, Flex, Padding, Scroll};
use druid::{AppLauncher, Widget, WindowDesc};

fn main() {
    let window = WindowDesc::new(build_widget);
    AppLauncher::with_window(window)
        .use_simple_logger()
        .launch(0u32)
        .expect("launch failed");
}

fn build_widget() -> impl Widget<u32> {
    let mut col = Flex::column();
    for i in 0..30 {
        let button = Button::new(format!("Button {}", i), Button::noop);
        col.add_child(Padding::new(3.0, button), 0.0);
    }
    Scroll::new(col)
}