import ToolBaseClass from '../../browser/tool/Tool';
import ViewerEvent from '../../browser/viewer/ViewerEvent';
/**
 * DragInfo holds convenient data while dragging.
 */
export interface DragInfo {
    /**
     * The mouse travel distance since the previous drag event.
     */
    dx: number;
    /**
     * The mouse travel distance since the previous drag event.
     */
    dy: number;
    /**
     * The total mouse travel distance since the mouse was pressed.
     */
    totalDx: number;
    /**
     * The total mouse travel distance since the mouse was pressed.
     */
    totalDy: number;
}
/**
 * DraggableTool is a base class for tools that handles mouse dragging
 * over the Viewer.
 * This class manages a protected member "dragInfo", which holds handy values
 * such as the total mouse move distance from the drag start point.
 */
export default abstract class DraggableTool extends ToolBaseClass {
    protected usePointerLockAPI: boolean;
    /**
     * Holds some useful drag-related variables.
     */
    protected dragInfo: DragInfo;
    private prevX;
    private prevY;
    private startX;
    private startY;
    private prevTotalX;
    private prevTotalY;
    dragStartHandler(ev: ViewerEvent): void;
    dragHandler(ev: ViewerEvent): void;
    dragEndHandler(ev: ViewerEvent): void;
    private updateInfo;
}