281 lines
10 KiB
Rust
281 lines
10 KiB
Rust
use std::rc::Rc;
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use gpui::{
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Animation, AnimationExt, App, Div, ElementId, ImageSource, InteractiveElement, IntoElement,
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MouseButton, ObjectFit, ParentElement, Pixels, Point, RenderOnce, SharedString, Size, Stateful,
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StatefulInteractiveElement, Styled, Window, anchored, canvas, deferred, div, prelude::*,
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};
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use crate::{
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forms::Run,
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motion,
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primitives::{FocusRing, FocusScope, Icon, IconName, Image, give_back, take_focus},
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theme::{ActiveTheme, ControlSize, IconSize, TextSize},
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};
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/// One picture in a lightbox, and the line under it.
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#[derive(Clone)]
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pub struct Slide {
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source: ImageSource,
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caption: SharedString,
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}
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impl Slide {
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pub fn new(source: impl Into<ImageSource>, caption: impl Into<SharedString>) -> Self {
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Self {
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source: source.into(),
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caption: caption.into(),
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}
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}
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}
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type OnStep = Rc<dyn Fn(usize, &mut Window, &mut App)>;
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/// A round button drawn for the dark layer: light icon, a faint fill on hover, dim when it has nowhere to go.
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fn media_button(
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id: (ElementId, &'static str),
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icon: IconName,
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enabled: bool,
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run: impl Fn(&mut Window, &mut App) + 'static,
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cx: &App,
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) -> Stateful<Div> {
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let theme = cx.theme();
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let light = theme.colors.on_media;
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div()
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.id(id)
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.flex()
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.flex_none()
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.items_center()
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.justify_center()
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.size(theme.control_height(ControlSize::Lg))
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.rounded_full()
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.border_1()
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.border_color(gpui::transparent_black())
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.child(Icon::new(icon).size(IconSize::Md).color(if enabled {
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light
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} else {
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light.opacity(0.3)
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}))
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.on_mouse_down(MouseButton::Left, |_, window, cx| {
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window.prevent_default();
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cx.stop_propagation();
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})
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.when(enabled, |button| {
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button
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.cursor_pointer()
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.tab_index(0)
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.focus_ring(cx)
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.hover(|style| style.bg(light.opacity(0.12)))
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.on_click(move |_, window, cx| run(window, cx))
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})
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}
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/// Pictures over a dark layer, one at a time. Left and Right or the side buttons step through them; Escape, the close button or a press on the dark closes it.
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#[derive(IntoElement)]
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pub struct Lightbox {
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id: ElementId,
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slides: Vec<Slide>,
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at: usize,
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on_step: Option<OnStep>,
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on_close: Run,
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}
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impl Lightbox {
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/// Render it while open; the owner keeps `at` and moves it in `on_step`.
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pub fn new(
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id: impl Into<ElementId>,
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slides: impl IntoIterator<Item = Slide>,
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at: usize,
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on_close: impl Fn(&mut Window, &mut App) + 'static,
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) -> Self {
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let slides: Vec<Slide> = slides.into_iter().collect();
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assert!(
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at < slides.len(),
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"slide {at} is past the last of {}",
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slides.len()
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);
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Self {
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id: id.into(),
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slides,
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at,
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on_step: None,
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on_close: Rc::new(on_close),
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}
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}
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pub fn on_step(mut self, handler: impl Fn(usize, &mut Window, &mut App) + 'static) -> Self {
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self.on_step = Some(Rc::new(handler));
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self
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}
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}
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impl RenderOnce for Lightbox {
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fn render(self, window: &mut Window, cx: &mut App) -> impl IntoElement {
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let (at, count) = (self.at, self.slides.len());
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let turn = motion::changes((self.id.clone(), "at"), at, window, cx);
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let takeover = take_focus((self.id.clone(), "takeover"), window, cx);
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let focus = takeover.read(cx).focus.clone();
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let area = window.use_keyed_state((self.id.clone(), "area"), cx, |_, _| {
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Size::<Pixels>::default()
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});
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let room = *area.read(cx);
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let close: Run = {
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let (id, on_close) = (self.id.clone(), self.on_close);
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Rc::new(move |window, cx| {
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log::info!("lightbox {id:?}: closed");
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give_back(&takeover, window, cx);
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on_close(window, cx)
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})
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};
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let step: OnStep = {
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let (id, on_step) = (self.id.clone(), self.on_step);
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Rc::new(move |to, window, cx| {
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log::info!("lightbox {id:?}: slide {to}");
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if let Some(on_step) = &on_step {
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on_step(to, window, cx);
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}
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})
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};
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let (back, next) = (at.checked_sub(1), (at + 1 < count).then_some(at + 1));
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let side = |name: &'static str, icon: IconName, to: Option<usize>, cx: &App| {
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let step = step.clone();
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media_button(
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(self.id.clone(), name),
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icon,
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to.is_some(),
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move |window, cx| {
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if let Some(to) = to {
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step(to, window, cx);
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}
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},
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cx,
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)
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};
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let theme = cx.theme();
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let colors = &theme.colors;
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let slide = self.slides[at].clone();
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let picture = div()
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.size_full()
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.child(
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Image::new((self.id.clone(), format!("slide-{at}")), slide.source)
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.fit(ObjectFit::Contain)
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.w(room.width)
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.h(room.height),
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)
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.with_animation(
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(self.id.clone(), format!("turn-{turn}")),
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Animation::new(motion::duration(motion::BASE, cx))
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.with_easing(motion::ease_out_cubic),
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move |picture, t| {
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if turn == 0 {
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picture
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} else {
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picture.opacity(t)
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}
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},
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);
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let (keys, escape, press, button) = (step.clone(), close.clone(), close.clone(), close);
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let viewport = window.viewport_size();
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let stage = div()
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.id((self.id.clone(), "stage"))
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.w(viewport.width)
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.h(viewport.height)
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.bg(colors.media_backdrop)
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.text_color(colors.on_media)
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.occlude()
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.on_mouse_down(MouseButton::Left, move |_, window, cx| press(window, cx))
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.on_key_down(move |event, window, cx| {
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match (event.keystroke.key.as_str(), back, next) {
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("left", Some(to), _) | ("right", _, Some(to)) => keys(to, window, cx),
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("escape", _, _) => escape(window, cx),
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_ => return,
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}
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cx.stop_propagation();
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})
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.child(
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FocusScope::new(&focus)
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.trap()
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.size_full()
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.flex()
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.flex_col()
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.child(div().flex().justify_end().p_3().child(media_button(
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(self.id.clone(), "close"),
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IconName::X,
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true,
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move |window, cx| button(window, cx),
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cx,
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)))
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.child(
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div()
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.relative()
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.flex_1()
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.min_h_0()
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.child(
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div()
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.absolute()
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.top_0()
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.bottom_0()
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.left_16()
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.right_16()
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.on_mouse_down(MouseButton::Left, |_, _, cx| {
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cx.stop_propagation()
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})
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.child(picture)
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.child(
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canvas(
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move |bounds, _, cx| {
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if area.read(cx) != &bounds.size {
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area.update(cx, |area, cx| {
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*area = bounds.size;
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cx.notify();
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});
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}
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},
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|_, _, _, _| {},
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)
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.absolute()
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.top_0()
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.left_0()
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.size_full(),
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),
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)
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.child(
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div()
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.absolute()
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.top_0()
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.bottom_0()
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.left_3()
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.flex()
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.items_center()
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.child(side("back", IconName::ChevronLeft, back, cx)),
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)
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.child(
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div()
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.absolute()
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.top_0()
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.bottom_0()
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.right_3()
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.flex()
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.items_center()
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.child(side("next", IconName::ChevronRight, next, cx)),
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),
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)
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.child(
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div()
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.flex()
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.justify_center()
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.gap_3()
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.p_5()
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.text_size(theme.text_size(TextSize::Sm))
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.child(slide.caption)
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.child(
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div()
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.text_color(colors.on_media.opacity(0.6))
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.child(format!("{} / {count}", at + 1)),
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),
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),
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);
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deferred(anchored().position(Point::default()).child(stage)).with_priority(1)
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}
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}
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