/**
 * Contains the ScrollView class, which represents a scrollable area that can have content that is larger than its bounds.
 * @module "ui/scroll-view"
 */ /** */

import { ContentView, EventData, Property } from "../content-view";

/**
 * Represents a scrollable area that can have content that is larger than its bounds.
 */
export class ScrollView extends ContentView {
    /**
     * String value used when hooking to scroll event.
     */
    public static scrollEvent: string;

    /**
     * Gets a value that contains the vertical offset of the scrolled content.
     */
    verticalOffset: number;

    /**
     * Gets a value that contains the horizontal offset of the scrolled content.
     */
    horizontalOffset: number;

    /**
     * Gets the maximum value for the verticalOffset.
     */
    scrollableHeight: number;

    /**
     * Gets the maximum value for the horizontalOffset.
     */
    scrollableWidth: number;

    /**
     * Toggles scrollbar indicator visibility
     */
    scrollBarIndicatorVisible: boolean;

    /**
     * Scrolls the content the specified vertical offset position.
     * @param value The offset value
     * @param animated true for animated scroll, false for immediate scroll.
     */
    scrollToVerticalOffset(value: number, animated: boolean);

    /**
     * Scrolls the content the specified horizontal offset position.
     * @param value The offset value
     * @param animated true for animated scroll, false for immediate scroll.
     */
    scrollToHorizontalOffset(value: number, animated: boolean);

    /**
     * Gets or sets direction in which the content can be scrolled.
     */
    orientation: Orientation;

    /**
     * A basic method signature to hook an event listener (shortcut alias to the addEventListener method).
     * @param eventNames - String corresponding to events (e.g. "propertyChange"). Optionally could be used more events separated by `,` (e.g. "propertyChange", "change"). 
     * @param callback - Callback function which will be executed when event is raised.
     * @param thisArg - An optional parameter which will be used as `this` context for callback execution.
     */
    on(eventNames: string, callback: (data: EventData) => void, thisArg?: any);

    /**
     * Raised when a scroll event occurs.
     */
    on(event: "scroll", callback: (args: ScrollEventData) => void, thisArg?: any);

    _onOrientationChanged();
}

export interface ScrollEventData extends EventData {
    scrollX: number;
    scrollY: number;
}

export type Orientation = "horizontal" | "vertical";

export const orientationProperty: Property<ScrollView, Orientation>;