dial.rs

// 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.

//! An example of the `dial` widget.

use druid::widget::{Flex, Label, WidgetExt};
use druid::{AppLauncher, Color, Data, Lens, PlatformError, Size, Widget, WindowDesc};

use druid_widgets::Dial;

#[derive(Clone, Data, Lens)]
struct DialLabel {
    value: f64,
}

impl DialLabel {
    fn new(text: &str) -> impl Widget<DialLabel> {
        let text = text.to_string();
        let label =
            Label::new(move |data: &DialLabel, _env: &_| format!("{} {:.3}", text, data.value));
        let solid = Color::rgb8(0x3a, 0x3a, 0x3a);
        let mut col = Flex::column();
        col.add_child(
            Dial::new(Size::new(100.0, 100.0))
                .lens(DialLabel::value)
                .background(solid.clone())
                .padding(5.0),
            0.0,
        );
        col.add_child(label.padding(5.0).background(solid.clone()), 0.0);
        col
    }
}
#[derive(Clone, Data, Lens)]
struct Envelope {
    attack: DialLabel,
    decay: DialLabel,
    sustain: DialLabel,
    release: DialLabel,
}

impl Envelope {
    fn new() -> impl Widget<Envelope> {
        let solid = Color::rgb8(0x3a, 0x3a, 0x3a);
        Flex::row()
            .with_child(
                DialLabel::new("Attack")
                    .lens(Envelope::attack)
                    .background(solid.clone())
                    .padding(5.0),
                1.0,
            )
            .with_child(
                DialLabel::new("Decay")
                    .lens(Envelope::decay)
                    .background(solid.clone())
                    .padding(5.0),
                1.0,
            )
            .with_child(
                DialLabel::new("Sustain")
                    .lens(Envelope::sustain)
                    .background(solid.clone())
                    .padding(5.0),
                1.0,
            )
            .with_child(
                DialLabel::new("Release")
                    .lens(Envelope::release)
                    .background(solid.clone())
                    .padding(5.0),
                1.0,
            )
    }
}

fn main() -> Result<(), PlatformError> {
    AppLauncher::with_window(WindowDesc::new(Envelope::new))
        .use_simple_logger()
        .launch(Envelope {
            attack: DialLabel { value: 0.1 },
            decay: DialLabel { value: 0.2 },
            sustain: DialLabel { value: 0.3 },
            release: DialLabel { value: 0.4 },
        })?;

    Ok(())
}