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import type { MouseEvent as ReactMouseEvent } from "react";
import type { FrameRate } from "opencut-wasm";
import { BASE_TIMELINE_PIXELS_PER_SECOND } from "@/timeline/scale";
import { mediaTime, snapSeekMediaTime, TICKS_PER_SECOND, type MediaTime } from "@/wasm";
type SeekSource = "ruler" | "tracks";
interface PendingSeekSession {
kind: "pending";
source: SeekSource;
downX: number;
downY: number;
downTime: number;
}
type Session = { kind: "idle" } | PendingSeekSession;
export interface SeekConfig {
zoomLevel: number;
duration: MediaTime;
isSelecting: boolean;
getPlayheadEl: () => HTMLDivElement | null;
getTrackLabelsEl: () => HTMLDivElement | null;
getRulerScrollEl: () => HTMLDivElement | null;
getTracksScrollEl: () => HTMLDivElement | null;
getActiveProjectFps: () => FrameRate | null;
clearSelectedElements: () => void;
seek: (time: MediaTime) => void;
setTimelineViewState: (viewState: {
zoomLevel: number;
scrollLeft: number;
playheadTime: MediaTime;
}) => void;
}
export interface SeekConfigRef {
readonly current: SeekConfig;
}
function pixelToTime({
clientX,
scrollContainer,
zoomLevel,
duration,
}: {
clientX: number;
scrollContainer: HTMLDivElement;
zoomLevel: number;
duration: MediaTime;
}): MediaTime {
const rect = scrollContainer.getBoundingClientRect();
const mouseX = clientX - rect.left;
const scrollLeft = scrollContainer.scrollLeft;
const rawTimeSeconds = Math.max(
0,
Math.min(
duration / TICKS_PER_SECOND,
(mouseX + scrollLeft) / (BASE_TIMELINE_PIXELS_PER_SECOND * zoomLevel),
),
);
return mediaTime({ ticks: Math.round(rawTimeSeconds * TICKS_PER_SECOND) });
}
function isClickGesture({
event,
session,
}: {
event: ReactMouseEvent;
session: PendingSeekSession;
}): boolean {
const deltaX = Math.abs(event.clientX - session.downX);
const deltaY = Math.abs(event.clientY - session.downY);
const deltaTime = event.timeStamp - session.downTime;
return deltaX <= 5 && deltaY <= 5 && deltaTime <= 500;
}
export class SeekController {
private session: Session = { kind: "idle" };
private readonly configRef: SeekConfigRef;
constructor(deps: { configRef: SeekConfigRef }) {
this.configRef = deps.configRef;
this.onTracksMouseDown = this.onTracksMouseDown.bind(this);
this.onRulerMouseDown = this.onRulerMouseDown.bind(this);
this.onTracksClick = this.onTracksClick.bind(this);
this.onRulerClick = this.onRulerClick.bind(this);
}
private get config(): SeekConfig {
return this.configRef.current;
}
destroy(): void {
this.session = { kind: "idle" };
}
onTracksMouseDown(event: ReactMouseEvent): void {
this.beginPendingSeek({ event, source: "tracks" });
}
onRulerMouseDown(event: ReactMouseEvent): void {
this.beginPendingSeek({ event, source: "ruler" });
}
onTracksClick(event: ReactMouseEvent): void {
this.handleClick({ event, source: "tracks" });
}
onRulerClick(event: ReactMouseEvent): void {
this.handleClick({ event, source: "ruler" });
}
private beginPendingSeek({
event,
source,
}: {
event: ReactMouseEvent;
source: SeekSource;
}): void {
if (event.button !== 0) return;
this.session = {
kind: "pending",
source,
downX: event.clientX,
downY: event.clientY,
downTime: event.timeStamp,
};
}
private handleClick({
event,
source,
}: {
event: ReactMouseEvent;
source: SeekSource;
}): void {
const shouldProcess = this.shouldProcessClick({ event, source });
this.session = { kind: "idle" };
if (!shouldProcess) return;
this.config.clearSelectedElements();
this.seekFromEvent({ event, source });
}
private shouldProcessClick({
event,
source,
}: {
event: ReactMouseEvent;
source: SeekSource;
}): boolean {
if (this.session.kind !== "pending") return false;
if (this.session.source !== source) return false;
if (!isClickGesture({ event, session: this.session })) return false;
if (this.config.isSelecting) return false;
const target = event.target as HTMLElement;
if (this.config.getPlayheadEl()?.contains(target)) return false;
if (this.config.getTrackLabelsEl()?.contains(target)) {
this.config.clearSelectedElements();
return false;
}
return true;
}
private seekFromEvent({
event,
source,
}: {
event: ReactMouseEvent;
source: SeekSource;
}): void {
const scrollContainer =
source === "ruler"
? this.config.getRulerScrollEl()
: this.config.getTracksScrollEl();
if (!scrollContainer) return;
const rawTime = pixelToTime({
clientX: event.clientX,
scrollContainer,
zoomLevel: this.config.zoomLevel,
duration: this.config.duration,
});
const fps = this.config.getActiveProjectFps();
const time =
fps != null
? snapSeekMediaTime({
time: rawTime,
duration: this.config.duration,
fps,
})
: rawTime;
this.config.seek(time);
this.config.setTimelineViewState({
zoomLevel: this.config.zoomLevel,
scrollLeft: scrollContainer.scrollLeft,
playheadTime: time,
});
}
}
|
