import { Point } from '../util/canvas-util';
import { DiagramElement } from './model/diagram-element';
import { DiagramNode } from './model/diagram-node';
/**
 * Represents an action taken by the user on the diagram which doesn't have an impact on the diagram's model.
 * Contrast with {@link DiagramAction} which does have an impact on the diagram's model.
 * @public
 */
export declare abstract class DiagramEvent {
    readonly type: DiagramEvents;
    defaultPrevented: boolean;
    constructor(type: DiagramEvents);
    preventDefault(): void;
}
/**
 * Diagram user events.
 * @public
 */
export declare enum DiagramEvents {
    Zoom = 0,
    DoubleClick = 1,
    SecondaryClick = 2,
    Selection = 3,
    Highlight = 4,
    DraggingNode = 5
}
/**
 * Diagram event which consists of the user zooming or panning.
 */
export declare class DiagramZoomEvent extends DiagramEvent {
    coords: Point;
    zoom: number;
    /**
     * Create a diagram zoom event.
     *
     * @param coords Coordinates to which the user panned. Calling the method `canvas.translateTo()` with these coordinates after this event should cause no changes.
     * @param zoom Zoom level to which the user zoomed. Calling the method `canvas.zoomTo()` with this zoom level after this event should cause no changes.
     */
    constructor(coords: Point, zoom: number);
}
/**
 * Diagram event which consists of the user performing a double click on the diagram.
 */
export declare class DiagramDoubleClickEvent extends DiagramEvent {
    cause: MouseEvent;
    target: DiagramElement | null;
    coords?: Point;
    /**
     * Create a diagram double click event.
     *
     * @param cause Mouse event which triggered this event.
     * @param target Diagram element which is targeted by the event, or null if no element was targeted (the diagram background was targeted).
     * @param coords Optionally, coordinates of the point of the diagram where the event happened.
     */
    constructor(cause: MouseEvent, target: DiagramElement | null, coords?: Point);
}
/**
 * Diagram event which consists of the user performing a secondary click on the diagram.
 */
export declare class DiagramSecondaryClickEvent extends DiagramEvent {
    cause: MouseEvent;
    target: DiagramElement | null;
    coords?: Point;
    /**
     * Create a diagram secondary click event.
     *
     * @param cause Mouse event which triggered this event.
     * @param target Diagram element which is targeted by the event, or null if no element was targeted (the diagram background was targeted).
     * @param coords Optionally, coordinates of the point of the diagram where the event happened.
     */
    constructor(cause: MouseEvent, target: DiagramElement | null, coords?: Point);
}
/**
 * Diagram event which consists of the user either adding or removing one or several diagram elements from the user selection.
 */
export declare class DiagramSelectionEvent extends DiagramEvent {
    targets: DiagramElement[];
    selected: boolean;
    /**
     * Create a diagram selection event.
     *
     * @param targets Diagram elements which are targeted by the event.
     * @param selected `true` if the targets were selected, `false` if the targets were deselected.
     */
    constructor(targets: DiagramElement[], selected: boolean);
}
/**
 * Diagram event which consists of the user highlighting a diagram element.
 * If the target is `null`, that means that the previously highlighted element was unhighlighted.
 */
export declare class DiagramHighlightedEvent extends DiagramEvent {
    target: DiagramElement | null;
    /**
     * Create a diagram highlight event.
     *
     * @param target Diagram element which is targeted by the event.
     */
    constructor(target: DiagramElement | null);
}
/**
 * Diagram event which consists of the user dragging a diagram node.
 */
export declare class DiagramDraggingNodeEvent extends DiagramEvent {
    target: DiagramNode;
    /**
     * Create a diagram dragging node event.
     *
     * @param target Diagram node which is targeted by the event.
     */
    constructor(target: DiagramNode);
}