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import { useEffect, useReducer, useState } from "react";
import { useEditor } from "@/editor/use-editor";
import { useCommittedRef } from "@/hooks/use-committed-ref";
import { useKeyframeSelection } from "./use-keyframe-selection";
import { registerCanceller } from "@/editor/cancel-interaction";
import {
KeyframeDragController,
type KeyframeDragConfig,
type KeyframeDragState,
} from "@/timeline/controllers/keyframe-drag-controller";
import type { TimelineElement } from "@/timeline";
import type { MediaTime } from "@/wasm";
export type { KeyframeDragState };
export function useKeyframeDrag({
zoomLevel,
element,
displayedStartTime,
}: {
zoomLevel: number;
element: TimelineElement;
displayedStartTime: MediaTime;
}) {
const editor = useEditor();
const {
selectedKeyframes,
isKeyframeSelected,
setKeyframeSelection,
toggleKeyframeSelection,
selectKeyframeRange,
} = useKeyframeSelection();
const config: KeyframeDragConfig = {
zoomLevel,
element,
displayedStartTime,
getFps: () => editor.project.getActive()?.settings.fps ?? null,
selectedKeyframes,
isKeyframeSelected,
setKeyframeSelection,
toggleKeyframeSelection,
selectKeyframeRange,
executeCommand: (command) => editor.command.execute({ command }),
seek: ({ time }) => editor.playback.seek({ time }),
getTotalDuration: () => editor.timeline.getTotalDuration(),
};
const configRef = useCommittedRef(config);
const [controller] = useState(
() => new KeyframeDragController({ configRef }),
);
const [, rerender] = useReducer((n: number) => n + 1, 0);
useEffect(() => controller.subscribe(rerender), [controller]);
useEffect(() => {
if (!controller.isActive) return;
return registerCanceller({ fn: () => controller.cancel() });
}, [controller.isActive, controller]);
useEffect(() => () => controller.destroy(), [controller]);
return {
keyframeDragState: controller.keyframeDragState,
handleKeyframeMouseDown: controller.onKeyframeMouseDown,
handleKeyframeClick: controller.onKeyframeClick,
getVisualOffsetPx: controller.getVisualOffsetPx,
};
}
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