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// Copyright 2019 The Druid 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.

//! A simple test of overlapping widgets.

// On Windows platform, don't show a console when opening the app.
#![windows_subsystem = "windows"]

use druid::widget::prelude::*;
use druid::widget::{Button, Label, ZStack};
use druid::{AppLauncher, Data, Lens, UnitPoint, Vec2, WindowDesc};

#[derive(Clone, Data, Lens)]
struct State {
    counter: usize,
}

pub fn main() {
    // describe the main window
    let main_window = WindowDesc::new(build_root_widget())
        .title("Hello World!")
        .window_size((400.0, 400.0));

    // create the initial app state
    let initial_state: State = State { counter: 0 };

    // start the application. Here we pass in the application state.
    AppLauncher::with_window(main_window)
        .log_to_console()
        .launch(initial_state)
        .expect("Failed to launch application");
}

fn build_root_widget() -> impl Widget<State> {
    ZStack::new(
        Button::from_label(Label::dynamic(|state: &State, _| {
            format!(
                "Very large button with text! Count up (currently {})",
                state.counter
            )
        }))
        .on_click(|_, state: &mut State, _| state.counter += 1),
    )
    .with_child(
        Button::new("Reset").on_click(|_, state: &mut State, _| state.counter = 0),
        Vec2::new(1.0, 1.0),
        Vec2::ZERO,
        UnitPoint::LEFT,
        Vec2::new(10.0, 0.0),
    )
}