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//! Beat timing as the user interface shows it: the engine owns Link and the
//! tempo; this mirrors its state and turns the timing buttons into actions.
use egui::{Button, Color32, CornerRadius, Slider, Stroke, TextFormat, Ui, Vec2, text::LayoutJob};
use gled_protocol::state::ClientInput;
use web_time::Instant;
use gled_protocol::action::UiAction;
use crate::app::timing::BeatState;
/// The color of Ableton Link in the interface.
pub(crate) const LINK_ACTIVE_COLOR: Color32 = Color32::from_rgb(41, 116, 145);
#[derive(Debug, Default)]
pub(crate) struct ClientTiming {
beat: BeatState,
/// When `beat` arrived, to move it on between the engine's reports.
received_at: Option<Instant>,
tap_count: usize,
/// The BPM slider's value while it is being dragged.
slider: Option<f32>,
}
impl ClientTiming {
/// Takes the beat timing the engine published.
pub(crate) fn update(&mut self, beat: BeatState, tap_count: usize) {
if beat != self.beat {
self.beat = beat;
self.received_at = Some(Instant::now());
}
self.tap_count = tap_count;
}
/// The beat now: the engine's last report moved on by the time since,
/// for what runs every frame between the reports, such as controller
/// lights that blink with the beat.
pub(crate) fn beat_progression_now(&self) -> f32 {
let elapsed = self
.received_at
.map_or(0.0, |received_at| received_at.elapsed().as_secs_f32());
self.beat.beat_progression + elapsed * self.beat.beats_per_minute / 60.0
}
pub(crate) fn beat_progression(&self) -> f32 {
self.beat.beat_progression
}
pub(crate) fn beats_per_minute(&self) -> f32 {
self.beat.beats_per_minute
}
/// Frame rate of the render thread, `None` until its first report.
pub(crate) fn framerate(&self) -> Option<f32> {
(self.beat.framerate > 0.0).then_some(self.beat.framerate)
}
pub(crate) fn beat_state(&self) -> BeatState {
self.beat
}
/// The tempo slider. Changes go to the engine while it is dragged.
pub(crate) fn bpm_slider(&mut self, ui: &mut Ui, enabled: bool) {
let mut value = self.slider.unwrap_or(self.beat.beats_per_minute);
let response = ui.add_enabled(
enabled,
Slider::new(&mut value, 20.0..=999.0).custom_formatter(|n, _| format!("{n:.1} bpm")),
);
if response.changed() {
ClientInput::SetBeatsPerMinute(value).enqueue();
}
self.slider = (response.dragged() || response.has_focus()).then_some(value);
}
pub(crate) fn half_button(&self, ui: &mut Ui, ableton_link_read_only: bool) {
if ui
.add_enabled(!ableton_link_read_only, Button::new("x½"))
.clicked()
{
UiAction::SpeedMultiply(0.5).enqueue();
}
}
pub(crate) fn double_button(&self, ui: &mut Ui, ableton_link_read_only: bool) {
if ui
.add_enabled(!ableton_link_read_only, Button::new("x2"))
.clicked()
{
UiAction::SpeedMultiply(2.0).enqueue();
}
}
pub(crate) fn tap_button(
&self,
ui: &mut Ui,
menu_button_size: Vec2,
ableton_link_read_only: bool,
) {
ui.scope(|ui| {
ui.style_mut().visuals.widgets.inactive.bg_stroke =
ui.style().visuals.widgets.noninteractive.bg_stroke;
let underlined = TextFormat {
underline: Stroke::new(1.0, Color32::GRAY),
..Default::default()
};
let mut tap_text = LayoutJob::default();
tap_text.append("T", 0.0, underlined);
tap_text.append(
&format!(
"ap{}",
match (self.tap_count, self.tap_count % 4) {
(0, _) => "",
(_, 0) => "/",
(_, 1) => "–",
(_, 2) => "\\",
_ => "|",
}
),
0.0,
TextFormat::default(),
);
let response = ui.add_enabled(
!ableton_link_read_only,
Button::new(tap_text).min_size(menu_button_size),
);
let mut alpha = None;
let bar_progression = self.beat.beat_progression % 1.0;
if bar_progression < 0.10 {
alpha = Some(30.0);
} else if bar_progression < 0.20 {
alpha = Some(20.0 - ((bar_progression - 0.1) * 200.0));
} else if bar_progression > 0.9 {
alpha = Some((bar_progression - 0.9) * 200.0);
}
if let Some(alpha) = alpha {
ui.painter().rect_filled(
match self.beat_flank() {
0 =>
// top left
{
response
.rect
.split_left_right_at_fraction(0.5)
.0
.split_top_bottom_at_fraction(0.5)
.0
}
1 =>
// top right
{
response
.rect
.split_left_right_at_fraction(0.5)
.1
.split_top_bottom_at_fraction(0.5)
.0
}
2 =>
// bottom left
{
response
.rect
.split_left_right_at_fraction(0.5)
.0
.split_top_bottom_at_fraction(0.5)
.1
}
3 =>
// bottom right
{
response
.rect
.split_left_right_at_fraction(0.5)
.1
.split_top_bottom_at_fraction(0.5)
.1
}
_ => unreachable!(),
}
.shrink(1.0),
CornerRadius::default(),
Color32::from_white_alpha(alpha as u8),
);
}
if response.clicked() {
UiAction::Tap.enqueue();
}
});
}
pub(crate) fn beat_flank(&self) -> u8 {
match self.beat.beat_progression % 4.0 {
0.5..1.5 => 1,
1.5..2.5 => 2,
2.5..3.5 => 3,
_ => 0,
}
}
}