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201 lines
5.8 KiB
201 lines
5.8 KiB
use crate::{
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time::{Duration, Instant},
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ui::{
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animation::Animation,
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component::{Component, Event, EventCtx},
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display::{self, Color, Font},
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geometry::{Offset, Rect},
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},
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};
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pub enum LoaderMsg {
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GrownCompletely,
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ShrunkCompletely,
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}
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enum State {
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Initial,
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Growing(Animation<u16>),
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Shrinking(Animation<u16>),
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Grown,
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}
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pub struct Loader {
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area: Rect,
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state: State,
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growing_duration: Duration,
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shrinking_duration: Duration,
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text: display::TextOverlay<'static>,
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styles: LoaderStyleSheet,
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}
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impl Loader {
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pub const SIZE: Offset = Offset::new(120, 120);
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pub fn new(text: &'static str, styles: LoaderStyleSheet) -> Self {
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let overlay = display::TextOverlay::new(text, styles.normal.font);
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Self {
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area: Rect::zero(),
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state: State::Initial,
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growing_duration: Duration::from_millis(1000),
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shrinking_duration: Duration::from_millis(500),
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text: overlay,
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styles,
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}
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}
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pub fn start_growing(&mut self, ctx: &mut EventCtx, now: Instant) {
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let mut anim = Animation::new(
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display::LOADER_MIN,
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display::LOADER_MAX,
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self.growing_duration,
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now,
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);
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if let State::Shrinking(shrinking) = &self.state {
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anim.seek_to_value(shrinking.value(now));
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}
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self.state = State::Growing(anim);
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// The animation is starting, request an animation frame event.
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ctx.request_anim_frame();
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// We don't have to wait for the animation frame event with the first paint,
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// let's do that now.
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ctx.request_paint();
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}
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pub fn start_shrinking(&mut self, ctx: &mut EventCtx, now: Instant) {
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let mut anim = Animation::new(
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display::LOADER_MAX,
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display::LOADER_MIN,
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self.shrinking_duration,
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now,
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);
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if let State::Growing(growing) = &self.state {
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anim.seek_to_value(display::LOADER_MAX - growing.value(now));
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}
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self.state = State::Shrinking(anim);
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// The animation should be already progressing at this point, so we don't need
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// to request another animation frames, but we should request to get painted
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// after this event pass.
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ctx.request_paint();
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}
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pub fn reset(&mut self) {
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self.state = State::Initial;
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}
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pub fn animation(&self) -> Option<&Animation<u16>> {
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match &self.state {
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State::Initial => None,
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State::Grown => None,
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State::Growing(a) | State::Shrinking(a) => Some(a),
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}
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}
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pub fn progress(&self, now: Instant) -> Option<u16> {
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self.animation().map(|a| a.value(now))
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}
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pub fn is_animating(&self) -> bool {
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self.animation().is_some()
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}
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pub fn is_completely_grown(&self, now: Instant) -> bool {
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matches!(self.progress(now), Some(display::LOADER_MAX))
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}
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pub fn is_completely_shrunk(&self, now: Instant) -> bool {
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matches!(self.progress(now), Some(display::LOADER_MIN))
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}
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pub fn paint_loader(&mut self, style: &LoaderStyle, done: i32) {
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let invert_from = ((self.area.width() + 1) * done) / (display::LOADER_MAX as i32);
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display::bar_with_text_and_fill(
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self.area,
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Some(self.text),
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style.fg_color,
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style.bg_color,
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-1,
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invert_from,
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);
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}
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}
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impl Component for Loader {
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type Msg = LoaderMsg;
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fn place(&mut self, bounds: Rect) -> Rect {
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self.area = bounds;
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let baseline = bounds.bottom_center() + Offset::new(1, -1);
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self.text.place(baseline);
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self.area
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}
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fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
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let now = Instant::now();
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if let Event::Timer(EventCtx::ANIM_FRAME_TIMER) = event {
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if self.is_animating() {
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// We have something to paint, so request to be painted in the next pass.
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ctx.request_paint();
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if self.is_completely_grown(now) {
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self.state = State::Grown;
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return Some(LoaderMsg::GrownCompletely);
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} else if self.is_completely_shrunk(now) {
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self.state = State::Initial;
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return Some(LoaderMsg::ShrunkCompletely);
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} else {
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// There is further progress in the animation, request an animation frame event.
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ctx.request_anim_frame();
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}
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}
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}
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None
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}
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fn paint(&mut self) {
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// TODO: Consider passing the current instant along with the event -- that way,
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// we could synchronize painting across the component tree. Also could be useful
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// in automated tests.
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// In practice, taking the current instant here is more precise in case some
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// other component in the tree takes a long time to draw.
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let now = Instant::now();
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if let State::Initial = self.state {
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self.paint_loader(self.styles.normal, 0);
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} else if let State::Grown = self.state {
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self.paint_loader(self.styles.normal, display::LOADER_MAX as i32);
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} else {
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let progress = self.progress(now);
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if let Some(done) = progress {
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self.paint_loader(self.styles.normal, done as i32);
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} else {
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self.paint_loader(self.styles.normal, 0);
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}
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}
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}
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}
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pub struct LoaderStyleSheet {
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pub normal: &'static LoaderStyle,
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}
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pub struct LoaderStyle {
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pub font: Font,
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pub fg_color: Color,
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pub bg_color: Color,
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}
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#[cfg(feature = "ui_debug")]
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impl crate::trace::Trace for Loader {
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fn trace(&self, d: &mut dyn crate::trace::Tracer) {
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d.open("Loader");
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d.close();
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}
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}
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