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import { calculateResize, type Rect, type ResizeHandle, snapToGrid } from "@/lib/geometry";
import type { CanvasComponent as CanvasComponentModel } from "@/types/canvas";
interface DragStartOptions {
mode?: "move" | "resize";
handle?: ResizeHandle;
}
interface DragSession {
mode: "move" | "resize";
pointerId: number | null;
handle?: ResizeHandle;
startClientX: number;
startClientY: number;
startRect: Rect;
}
type DragPointerEvent = Pick<
React.PointerEvent<HTMLElement>,
"button" | "clientX" | "clientY" | "stopPropagation"
> &
Partial<Pick<React.PointerEvent<HTMLElement>, "pointerId">>;
interface UseDragInteractionOptions {
component: Pick<CanvasComponentModel, "id" | "x" | "y" | "width" | "height">;
zoom: number;
onSelect: (id: string) => void;
onMove: (id: string, nextX: number, nextY: number) => void;
onResize: (
id: string,
updates: Pick<CanvasComponentModel, "x" | "y" | "width" | "height">,
) => void;
minWidth?: number;
minHeight?: number;
gridSize?: number;
onInteractionStart?: (id: string, mode: "move" | "resize") => void;
onInteractionEnd?: (id: string, mode: "move" | "resize") => void;
}
export function useDragInteraction({
component,
zoom,
onSelect,
onMove,
onResize,
minWidth = 48,
minHeight = 28,
gridSize = 1,
onInteractionStart,
onInteractionEnd,
}: UseDragInteractionOptions) {
const [interaction, setInteraction] = useState<DragSession | null>(null);
const safeMinWidth = Math.max(1, Math.round(minWidth));
const safeMinHeight = Math.max(1, Math.round(minHeight));
const isDragging = interaction !== null;
const isResizing = interaction?.mode === "resize";
const handleMouseDown = useCallback(
(event: DragPointerEvent, options: DragStartOptions = { mode: "move" }) => {
Iif (event.button !== 0) {
return false;
}
event.stopPropagation();
onSelect(component.id);
const pointerId = typeof event.pointerId === "number" ? event.pointerId : null;
const mode = options.mode ?? "move";
setInteraction({
mode,
pointerId,
handle: options.handle,
startClientX: event.clientX,
startClientY: event.clientY,
startRect: {
x: component.x,
y: component.y,
width: component.width,
height: component.height,
},
});
onInteractionStart?.(component.id, mode);
return true;
},
[
component.height,
component.id,
component.width,
component.x,
component.y,
onInteractionStart,
onSelect,
],
);
const handleMouseMove = useCallback(
(event: DragPointerEvent) => {
Iif (!interaction) {
return;
}
Iif (
interaction.pointerId !== null &&
typeof event.pointerId === "number" &&
event.pointerId !== interaction.pointerId
) {
return;
}
const deltaX = (event.clientX - interaction.startClientX) / zoom;
const deltaY = (event.clientY - interaction.startClientY) / zoom;
if (interaction.mode === "move") {
onMove(
component.id,
snapToGrid(interaction.startRect.x + deltaX, gridSize),
snapToGrid(interaction.startRect.y + deltaY, gridSize),
);
return;
}
Iif (!interaction.handle) {
return;
}
const nextRect = calculateResize(interaction.startRect, {
handle: interaction.handle,
deltaX,
deltaY,
minWidth: safeMinWidth,
minHeight: safeMinHeight,
gridSize,
});
onResize(component.id, nextRect);
},
[component.id, gridSize, interaction, onMove, onResize, safeMinHeight, safeMinWidth, zoom],
);
const handleMouseUp = useCallback(
(event: DragPointerEvent) => {
Iif (!interaction) {
return false;
}
Iif (
interaction.pointerId !== null &&
typeof event.pointerId === "number" &&
event.pointerId !== interaction.pointerId
) {
return false;
}
onInteractionEnd?.(component.id, interaction.mode);
setInteraction(null);
return true;
},
[component.id, interaction, onInteractionEnd],
);
return {
isDragging,
isResizing,
handleMouseDown,
handleMouseMove,
handleMouseUp,
};
}
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