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import { Slice } from "../slice";
import type { EditorContext } from "../editor-context";
import { ProjectSlice } from "./project-slice";
import { ChartSlice } from "./chart-slice";
import { ViewportSlice } from "./viewport-slice";
import { ColumnsSlice } from "./columns-slice";
import { SelectionSlice } from "./selection-slice";
import { BoxSelectionSlice } from "./box-selection-slice";
import { CursorSlice } from "./cursor-slice";
import { SnapSlice } from "./snap-slice";
import { TimingSlice } from "./timing-slice";
import { EVENT, NOTE, LEVEL_REF, BPM_CHANGE, TIME_SIGNATURE } from "../components";
import type { TimelineRenderSpec } from "../types";
export class RenderSlice extends Slice {
static readonly sliceKey = "render";
$visibleRenderObjects = atom<TimelineRenderSpec[]>([]);
constructor(ctx: EditorContext) {
super(ctx);
ctx.get(ProjectSlice).entityManager.$mutationVersion.subscribe(() => {
this.refresh();
});
ctx.get(SelectionSlice).$selection.subscribe(() => {
this.refresh();
});
ctx.get(CursorSlice).$cursorPulse.subscribe(() => {
this.refresh();
});
}
refresh(): void {
this.$visibleRenderObjects.set(this.computeSpecs());
}
private computeSpecs(): TimelineRenderSpec[] {
const chartSlice = this.ctx.get(ChartSlice);
const viewport = this.ctx.get(ViewportSlice);
const columnsSlice = this.ctx.get(ColumnsSlice);
const selection = this.ctx.get(SelectionSlice);
const boxSelection = this.ctx.get(BoxSelectionSlice);
const cursor = this.ctx.get(CursorSlice);
const snapSlice = this.ctx.get(SnapSlice);
const timing = this.ctx.get(TimingSlice);
const entityManager = this.ctx.get(ProjectSlice).entityManager;
const size = chartSlice.getChartSize();
const scaleY = viewport.getScaleY();
const trackHeight = viewport.getTrackHeight();
const contentHeight = viewport.getContentHeight();
const pulseRange = viewport.getVisiblePulseRange();
const pulseStart = pulseRange.start;
const pulseEnd = pulseRange.end;
const rawPulseStart = pulseRange.rawStart;
const rawPulseEnd = pulseRange.rawEnd;
const timelineWidth = columnsSlice.$timelineWidth.get();
const columns = columnsSlice.$columns.get();
const specs: TimelineRenderSpec[] = [];
// --- Column backgrounds (scroll layer) ---
for (let i = 0; i < columns.length; i++) {
const col = columns[i]!;
specs.push({
key: `column-bg-${col.id}`,
type: "column-bg",
x: col.x,
y: 0,
width: col.width,
height: contentHeight,
data: { backgroundColor: col.backgroundColor, showBorder: i > 0 },
testId: "timeline-column-bg",
});
}
// --- Column titles (sticky layer) ---
for (const col of columns) {
specs.push({
key: `column-title-${col.id}`,
type: "column-title",
x: col.x,
y: 4,
width: col.width,
height: 16,
layer: "sticky",
data: { title: col.title },
testId: "timeline-column-title",
});
}
// --- Trailing border after last column ---
specs.push({
key: "trailing-border",
type: "trailing-border",
x: timelineWidth - 1,
y: 0,
width: 1,
height: contentHeight,
data: {},
testId: "trailing-border",
});
// --- Gameplay notes ---
for (const entity of entityManager.entitiesWithComponent(NOTE)) {
const event = entityManager.getComponent(entity, EVENT);
const note = entityManager.getComponent(entity, NOTE);
const levelRef = entityManager.getComponent(entity, LEVEL_REF);
Iif (!event || !note || !levelRef) continue;
const pulse = event.y;
if (pulse < pulseStart || pulse >= pulseEnd) continue;
const laneCol = columns.find(
(c) => c.levelId === levelRef.levelId && c.laneIndex === note.lane,
);
if (!laneCol) continue;
const colIndex = columns.indexOf(laneCol);
specs.push({
key: `note-${entity.id}`,
type: "event-marker",
x: laneCol.x,
y: trackHeight - pulse * scaleY - 14,
width: laneCol.width,
height: 14,
data: {
text: "",
backgroundColor: laneCol.noteColor ?? "var(--accent-9)",
textColor: "#fff",
selected:
selection.$selection.get().has(entity.id) || boxSelection.isInBox(pulse, colIndex),
},
testId: "note",
entityId: entity.id,
});
}
// --- Timing event markers ---
const bpmColumn = columns.find((c) => c.id === "bpm");
const tsColumn = columns.find((c) => c.id === "time-sig");
const bpmColIndex = bpmColumn ? columns.indexOf(bpmColumn) : -1;
const tsColIndex = tsColumn ? columns.indexOf(tsColumn) : -1;
Eif (bpmColumn) {
for (const entity of entityManager.entitiesWithComponent(BPM_CHANGE)) {
const event = entityManager.getComponent(entity, EVENT);
const bpm = entityManager.getComponent(entity, BPM_CHANGE);
Iif (!event || !bpm) continue;
const pulse = event.y;
if (pulse < pulseStart || pulse >= pulseEnd) continue;
specs.push({
key: `bpm-${entity.id}`,
type: "event-marker",
x: bpmColumn.x,
y: trackHeight - pulse * scaleY - 14,
width: bpmColumn.width,
height: 14,
data: {
text: String(bpm.bpm),
backgroundColor: "var(--yellow-6)",
textColor: "#fff",
selected:
selection.$selection.get().has(entity.id) || boxSelection.isInBox(pulse, bpmColIndex),
},
testId: "bpm-change-marker",
entityId: entity.id,
});
}
}
Eif (tsColumn) {
for (const entity of entityManager.entitiesWithComponent(TIME_SIGNATURE)) {
const event = entityManager.getComponent(entity, EVENT);
const ts = entityManager.getComponent(entity, TIME_SIGNATURE);
Iif (!event || !ts) continue;
const pulse = event.y;
if (pulse < pulseStart || pulse >= pulseEnd) continue;
specs.push({
key: `ts-${entity.id}`,
type: "event-marker",
x: tsColumn.x,
y: trackHeight - pulse * scaleY - 14,
width: tsColumn.width,
height: 14,
data: {
text: `${ts.numerator}/${ts.denominator}`,
backgroundColor: "var(--tomato-6)",
textColor: "#fff",
selected:
selection.$selection.get().has(entity.id) || boxSelection.isInBox(pulse, tsColIndex),
},
testId: "time-sig-marker",
entityId: entity.id,
});
}
}
// --- Playhead ---
const cursorPulse = cursor.$cursorPulse.get();
Eif (cursorPulse >= 0 && cursorPulse <= size) {
specs.push({
key: "playhead",
type: "playhead",
x: 0,
y: trackHeight - cursorPulse * scaleY - 1,
width: timelineWidth,
height: 1,
data: {},
testId: "playhead",
});
}
if (rawPulseStart >= rawPulseEnd) return specs;
// --- Measure lines ---
const engine = timing.getTimingEngine();
const measureBoundaries = engine.getMeasureBoundaries({
start: rawPulseStart,
end: rawPulseEnd,
});
const measureSet = new Set(measureBoundaries);
const allBoundaries = engine.getMeasureBoundaries({
start: 0,
end: rawPulseEnd,
});
for (const pulse of measureBoundaries) {
const measureIndex = allBoundaries.indexOf(pulse);
specs.push({
key: `measure-${pulse}`,
type: "grid-line",
x: 0,
y: trackHeight - pulse * scaleY - 1,
width: timelineWidth,
height: 1,
data: {
color: "var(--gray-8)",
label: measureIndex >= 0 ? String(measureIndex + 1) : undefined,
},
testId: "measure-line",
});
}
// --- Beat lines (1/4, exclude measure boundaries) ---
const beatPoints = engine
.getSnapPoints("1/4", { start: rawPulseStart, end: rawPulseEnd })
.filter((p) => !measureSet.has(p));
const beatSet = new Set(beatPoints);
for (const pulse of beatPoints) {
specs.push({
key: `beat-${pulse}`,
type: "grid-line",
x: 0,
y: trackHeight - pulse * scaleY - 1,
width: timelineWidth,
height: 1,
data: { color: "var(--gray-7)" },
testId: "beat-line",
});
}
// --- Snap lines at current snap resolution (exclude measures and beats) ---
const snap = snapSlice.$snap.get();
const gridPoints = engine
.getSnapPoints(snap, { start: rawPulseStart, end: rawPulseEnd })
.filter((p) => !measureSet.has(p) && !beatSet.has(p));
for (const pulse of gridPoints) {
specs.push({
key: `grid-${pulse}`,
type: "grid-line",
x: 0,
y: trackHeight - pulse * scaleY - 1,
width: timelineWidth,
height: 1,
data: { color: "var(--gray-6)" },
testId: "snap-line",
});
}
// --- Selection box (during drag) ---
const boxRect = boxSelection.getBoxRect();
if (boxRect) {
Eif (
boxRect.minCol >= 0 &&
boxRect.maxCol >= 0 &&
boxRect.minCol < columns.length &&
boxRect.maxCol < columns.length
) {
const startCol = columns[boxRect.minCol]!;
const endCol = columns[boxRect.maxCol]!;
specs.push({
key: "selection-box",
type: "selection-box",
x: startCol.x,
y: trackHeight - boxRect.maxPulse * scaleY,
width: endCol.x + endCol.width - startCol.x,
height: (boxRect.maxPulse - boxRect.minPulse) * scaleY,
data: {},
testId: "selection-box",
});
}
}
return specs;
}
}
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