# All files / src/draggable utils.ts

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     import { type MouseEvent, type RefObject, type TouchEvent } from "react";
    import {
      getClientPosition,
      type ClientPositionEvent,
      type ClientPositionOptions,
    } from "../utils/getClientPosition.js";
    import { getRangeSteps } from "../utils/getRangeSteps.js";
    import { nearest } from "../utils/nearest.js";
    import { withinRange } from "../utils/withinRange.js";

    /**
     * @internal
     */
    export const isMouseDragStartEvent = (event: MouseEvent): boolean =>
      event.button === 0 &&
      !event.altKey &&
      !event.metaKey &&
      !event.ctrlKey &&
      !event.shiftKey;

    /**
     * @internal
     */
    export const isTouchDragStartEvent = (event: TouchEvent): boolean =>
      event.changedTouches.length === 1;

    /**
     * @internal
     */
    interface DragPositionOptions extends ClientPositionOptions {
      isRTL: boolean;
      reversed: boolean;
      container: Element;
    }

    /**
     * @internal
     */
    export const getDragPosition = (options: DragPositionOptions): number => {
      const { isRTL, reversed, vertical, container } = options;

      const clientPosition = getClientPosition(options);
      const { left, right, top } = container.getBoundingClientRect();
      if (vertical) {
        if (reversed) {
          return window.innerHeight - clientPosition;
        }

        // added `Math.max` since the `top` will be a negative number if rendered
        // within a portal element like a dialog/sheet
        return clientPosition - Math.max(0, top);
      }

      if (reversed ? !isRTL : isRTL) {
        return right - clientPosition;
      }

      return clientPosition - left;
    };

    /**
     * @internal
     */
    interface RelativeDragPositionOptions extends DragPositionOptions {
      min: number;
      max: number;
      step: number;
      rangeMin: number;
      rangeMax: number;
    }

    /**
     * @internal
     */
    interface RelativeDragPosition {
      value: number;
      dragPercentage: number;
    }

    /**
     * @internal
     */
    export const getRelativeDragPosition = (
      options: RelativeDragPositionOptions
    ): RelativeDragPosition => {
      const { min, max, rangeMin, rangeMax, step, isRTL, vertical, container } =
        options;

      const { height, width, left, top } = container.getBoundingClientRect();
      const containerSize = vertical ? height : width;
      const containerPosition = vertical ? top + height : left;
      const clientPosition = getClientPosition(options);

      const position = vertical
        ? containerPosition - clientPosition
        : clientPosition - containerPosition;
      const distanceDragged = Math.min(Math.max(0, position), containerSize);
      let dragPercentage = distanceDragged / containerSize;
      if (isRTL && !vertical) {
        dragPercentage = 1 - dragPercentage;
      }

      const range = rangeMax - rangeMin;
      const steps = getRangeSteps({ min: rangeMin, max: rangeMax, step });
      const value = dragPercentage * range + rangeMin;
      const nextValue = nearest({
        min,
        max,
        steps,
        range,
        value,
      });

      return {
        value: nextValue,
        dragPercentage,
      };
    };

    /**
     * @internal
     */
    interface UpdateDragPositionOptions
      extends Omit<RelativeDragPositionOptions, "container"> {
      event: ClientPositionEvent;
      nodeRef: RefObject<HTMLElement>;
      focus?: boolean;
      isDragStart: boolean;
      setValue(value: number): void;
      setDragging(dragging: boolean): void;
      setDragPercentage(value: number): void;
      withinOffsetParent: boolean;
    }

    /**
     * @internal
     */
    export const updateDragPosition = (
      options: UpdateDragPositionOptions
    ): void => {
      const {
        event,
        nodeRef,
        min,
        max,
        step,
        rangeMin,
        rangeMax,
        isRTL,
        reversed,
        vertical,
        isDragStart,
        setValue,
        setDragging,
        setDragPercentage,
        withinOffsetParent,
      } = options;

      const element = nodeRef.current;
      if (!element) {
        return;
      }

      if (isDragStart) {
        // need to focus so that Chromium based browsers allow drag events. this
        // really appeared while trying to create a DnD tree
        element.focus({ preventScroll: true });

        if (!withinOffsetParent && !("changedTouches" in event)) {
          return;
        }

        // unlike the other flow, start dragging immediately so that you can trigger
        // a mousedown or touchstart event on the container element and drag until
        // the user lets go
        setDragging(true);
      }

      // firefox defaults to `document.body` while chrome will return `null`
      const container = element.offsetParent || document.body;
      if (!withinOffsetParent) {
        const dragPosition = getDragPosition({
          event,
          isRTL,
          reversed,
          vertical,
          container,
        });
        const nextValue = withinRange({
          min,
          max,
          value: dragPosition,
        });
        setValue(nextValue);

        return;
      }

      const { value, dragPercentage } = getRelativeDragPosition({
        min,
        max,
        rangeMin,
        rangeMax,
        step,
        event,
        isRTL,
        reversed,
        vertical,
        container,
      });

      setValue(value);
      setDragPercentage(dragPercentage);
    };

    /**
     * @internal
     * @remarks \@since 6.0.0
     */
    export interface DeserializeDraggableValueOptions {
      min: number;
      max: number;
      item: string;
    }

    /**
     * @internal
     * @remarks \@since 6.0.0
     */
    export function deserializeDraggableValue(
      options: DeserializeDraggableValueOptions
    ): number {
      const { item, min, max } = options;

      const value = parseFloat(item);
      if (Number.isNaN(item)) {
        return min;
      }

      return Math.max(min, Math.min(max, value));
    }