/**
 * dom元素放大缩小、拖拽工具类
 */
interface ZoomConfig {
    maxSize?: number;
    minSize?: number;
}
interface DragOffset {
    x: number;
    y: number;
}
interface ZoomCallbacks {
    onScaleChange?: (scale: number) => void;
    onDragOffsetChange?: (offset: DragOffset) => void;
}
declare class XYZoom {
    private static instance;
    private dragging;
    private scale;
    private originScale;
    private dragOffset;
    private maxSize;
    private minSize;
    private innerDOM;
    private outerDOM;
    private pageX;
    private pageY;
    private pageX2;
    private pageY2;
    private callbacks;
    private enableDrag;
    private enableZoom;
    private initialWidth;
    private initialHeight;
    private initialX;
    private initialY;
    private scaleRatio;
    private resizeObserver;
    private onResizeChange;
    private onMouseMove;
    private onMouseDown;
    private onMouseUp;
    private onMouseWheel;
    private onTouchStart;
    private onMouseLeave;
    private constructor();
    static getInstance(config?: ZoomConfig): XYZoom;
    /**
     * 初始化
     *
     * @param { HTMLElement } innerDOM - 需要进行缩放和拖拽操作的目标元素
     * @param { HTMLElement } outerDOM - 限制缩放和拖拽范围的容器元素
     * @param { ZoomCallbacks } callbacks - 缩放比例和拖拽位置变化时的回调函数
     *
     * @returns { this } 返回当前实例，支持链式调用
     */
    init(innerDOM: HTMLElement, outerDOM: HTMLElement, options?: ZoomCallbacks & {
        scale?: number;
        dragOffset?: {
            x: number;
            y: number;
        };
        enableZoom?: boolean;
        enableDrag?: boolean;
    }): this;
    private handleResize;
    /**
     * 销毁
     */
    destroy(): void;
    /**
     * 处理鼠标按下事件
     *
     * @param e
     * @param innerDOM
     * @param outerDOM
     */
    private handleMouseDown;
    /**
     * 处理触摸开始事件
     *
     * @param e
     * @param innerDOM
     * @param outerDOM
     */
    private handleTouchStart;
    /**
     * 处理触摸移动事件
     *
     * @param e
     * @returns
     */
    private handleMouseMove;
    /**
     * 处理触摸结束事件
     */
    private handleMouseUp;
    private getInitialRect;
    /**
     * 滚轮缩放/mac两指拖动
     */
    private handleMouseWheel;
    /**
     * 更新放大缩小倍数，位置居中
     * 备注：此方法不限制缩放大小
     *
     * @param { number } scale - 缩放倍数
     */
    updateZoomScale(scale: number): void;
    /**
     * 拖拽
     *
     * @param { number } offsetX
     * @param { number } offsetY
     */
    private onDrag;
    /**
     * 计算拖拽的边界限制
     *
     * @param { HTMLElement } innerDOM - 需要进行缩放和拖拽操作的目标元素
     * @param { HTMLElement } outerDOM - 限制缩放和拖拽范围的容器元素
     * @param { number } offsetX - 拖拽的x轴偏移量
     * @param { number } offsetY - 拖拽的y轴偏移量
     * @param { number } scale - 当前缩放倍数
     * @returns
     */
    private calculateDragBoundary;
    /**
     * 处理放大、缩小倍数
     *
     * @private
     */
    private handleZoomScale;
    /**
     * 处理鼠标离开事件
     * 当鼠标移出outerDOM时触发
     * @param e
     */
    private handleMouseLeave;
}
declare const zoom: XYZoom;
export { zoom, XYZoom };