import { Emitter, Event } from '../events';
import { CompositeDisposable } from '../lifecycle';
/**
 * A valid JSON type
 */
export declare type StateObject = number | string | boolean | null | object | StateObject[] | {
    [key: string]: StateObject;
};
/**
 * A JSON-serializable object
 */
export interface State {
    [key: string]: StateObject;
}
export interface FocusEvent {
    readonly isFocused: boolean;
}
export interface PanelDimensionChangeEvent {
    readonly width: number;
    readonly height: number;
}
export interface VisibilityEvent {
    readonly isVisible: boolean;
}
export interface ActiveEvent {
    readonly isActive: boolean;
}
export interface PanelApi {
    readonly onDidDimensionsChange: Event<PanelDimensionChangeEvent>;
    readonly onDidStateChange: Event<void>;
    readonly onDidFocusChange: Event<FocusEvent>;
    readonly onDidVisibilityChange: Event<VisibilityEvent>;
    readonly onDidActiveChange: Event<ActiveEvent>;
    readonly onFocusEvent: Event<void>;
    setVisible(isVisible: boolean): void;
    setActive(): void;
    setState(key: string, value: StateObject): void;
    setState(state: State): void;
    getState: () => State;
    getStateKey: <T extends StateObject>(key: string) => T;
    /**
     * The id of the panel that would have been assigned when the panel was created
     */
    readonly id: string;
    /**
     * Whether the panel holds the current focus
     */
    readonly isFocused: boolean;
    /**
     * Whether the panel is the actively selected panel
     */
    readonly isActive: boolean;
    /**
     * Whether the panel is visible
     */
    readonly isVisible: boolean;
    /**
     * The panel width in pixels
     */
    readonly width: number;
    /**
     * The panel height in pixels
     */
    readonly height: number;
}
/**
 * A core api implementation that should be used across all panel-like objects
 */
export declare class PanelApiImpl extends CompositeDisposable implements PanelApi {
    readonly id: string;
    private _state;
    private _isFocused;
    private _isActive;
    private _isVisible;
    private _width;
    private _height;
    readonly _onDidStateChange: Emitter<void>;
    readonly onDidStateChange: Event<void>;
    readonly _onDidPanelDimensionChange: Emitter<PanelDimensionChangeEvent>;
    readonly onDidDimensionsChange: Event<PanelDimensionChangeEvent>;
    readonly _onDidChangeFocus: Emitter<FocusEvent>;
    readonly onDidFocusChange: Event<FocusEvent>;
    readonly _onFocusEvent: Emitter<void>;
    readonly onFocusEvent: Event<void>;
    readonly _onDidVisibilityChange: Emitter<VisibilityEvent>;
    readonly onDidVisibilityChange: Event<VisibilityEvent>;
    readonly _onVisibilityChange: Emitter<VisibilityEvent>;
    readonly onVisibilityChange: Event<VisibilityEvent>;
    readonly _onDidActiveChange: Emitter<ActiveEvent>;
    readonly onDidActiveChange: Event<ActiveEvent>;
    readonly _onActiveChange: Emitter<void>;
    readonly onActiveChange: Event<void>;
    get isFocused(): boolean;
    get isActive(): boolean;
    get isVisible(): boolean;
    get width(): number;
    get height(): number;
    constructor(id: string);
    setVisible(isVisible: boolean): void;
    setActive(): void;
    setState(key: string | {
        [key: string]: StateObject;
    }, value?: StateObject): void;
    getState(): State;
    getStateKey<T extends StateObject>(key: string): T;
    dispose(): void;
}