66 lines
2.5 KiB
Rust
66 lines
2.5 KiB
Rust
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use std::time::Duration;
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use kiln_core::game::GameState;
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use crate::scroll_overlay::{ScrollAnimState, ScrollOverlayState};
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/// View-only UI state for the log panel and scroll overlay. This is presentation
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/// state, so it lives in the front-end rather than on the engine's [`GameState`].
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pub(crate) struct Ui {
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/// Whether the bottom log panel is open.
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pub(crate) log_open: bool,
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/// Height (in terminal rows, borders included) of the log panel when open.
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pub(crate) log_height: u16,
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/// Vertical scroll offset of the log panel, in lines from the top (newest).
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pub(crate) scroll: u16,
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/// Scroll position, bounds, and animation state for an active scroll overlay.
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pub(crate) overlay: ScrollOverlayState,
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}
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impl Default for Ui {
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fn default() -> Self {
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Self {
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log_open: false,
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log_height: 10,
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scroll: 0,
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overlay: ScrollOverlayState::default(),
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}
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}
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}
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impl Ui {
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/// Scrolls the overlay by `delta` lines, clamped to the valid range.
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pub(crate) fn scroll_lines(&mut self, delta: i32) {
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self.overlay.offset = (self.overlay.offset as i32 + delta)
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.clamp(0, self.overlay.max_scroll as i32) as u16;
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}
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/// Advances all time-driven UI state by `dt` and drives the game tick.
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///
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/// Advances the scroll overlay animation, dispatches any finished close
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/// animation, ticks the game when no overlay is blocking, and starts the
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/// open animation when a new scroll appears.
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pub(crate) fn tick(&mut self, dt: Duration, game: &mut GameState) {
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self.overlay.advance_anim(dt.as_secs_f32());
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if self.overlay.close_finished() {
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game.close_scroll(self.overlay.take_choice().as_deref());
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self.overlay = ScrollOverlayState::default();
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}
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if game.active_scroll.is_none() {
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game.tick(dt);
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if game.active_scroll.is_some() && self.overlay.anim.is_none() {
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self.overlay.anim = Some(ScrollAnimState::Opening(0.0));
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}
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}
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}
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/// Starts the scroll-close animation with the optional player choice.
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/// Uses the current opening progress if the overlay was still animating in.
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pub(crate) fn begin_close(&mut self, choice: Option<String>) {
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let progress = match self.overlay.anim {
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Some(ScrollAnimState::Opening(p)) => p.min(1.0),
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_ => 1.0,
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};
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self.overlay.pending_choice = choice;
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self.overlay.anim = Some(ScrollAnimState::Closing(progress));
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}
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}
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