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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.
//! An example using the Either widget to show/hide a slider.
//! This is a very simple example, it uses a bool to determine
//! which widget gets shown.
// On Windows platform, don't show a console when opening the app.
#![windows_subsystem = "windows"]
use druid::widget::prelude::*;
use druid::widget::{Checkbox, Either, Flex, Label, Slider};
use druid::{AppLauncher, Data, Lens, WidgetExt, WindowDesc};
#[derive(Clone, Default, Data, Lens)]
struct AppState {
which: bool,
value: f64,
}
fn ui_builder() -> impl Widget<AppState> {
// Our UI consists of a column with a button and an `Either` widget
let button = Checkbox::new("Toggle slider")
.lens(AppState::which)
.padding(5.0);
// The `Either` widget has two children, only one of which is visible at a time.
// To determine which child is visible, you pass it a closure that takes the
// `Data` and the `Env` and returns a bool; if it returns `true`, the first
// widget will be visible, and if `false`, the second.
let either = Either::new(
|data, _env| data.which,
Slider::new().lens(AppState::value).padding(5.0),
Label::new("Click to reveal slider").padding(5.0),
);
Flex::column().with_child(button).with_child(either)
}
pub fn main() {
let main_window = WindowDesc::new(ui_builder()).title("Switcheroo");
AppLauncher::with_window(main_window)
.log_to_console()
.launch(AppState::default())
.expect("launch failed");
}