import { IValueDisposable } from '../../../lifecycle';
import { DockviewHeaderDirection } from '../../options';
import { Tab } from '../tab/tab';
import { ITabGroup } from '../../tabGroup';
import { TabGroupColorPalette } from '../../tabGroupAccent';
export interface TabGroupIndicatorContext {
    readonly tabsList: HTMLElement;
    getTabGroups(): readonly ITabGroup[];
    getActivePanelId(): string | undefined;
    getTabMap(): Map<string, IValueDisposable<Tab>>;
    getChipElement(groupId: string): HTMLElement | undefined;
    getDirection(): DockviewHeaderDirection;
    getColorPalette(): TabGroupColorPalette | undefined;
}
export interface ITabGroupIndicator {
    readonly underlines: ReadonlyMap<string, HTMLElement>;
    positionUnderlines(): void;
    trackUnderlines(): void;
    syncUnderlineElements(activeGroupIds: Set<string>): void;
    getUnderline(groupId: string): HTMLElement | undefined;
    dispose(): void;
}
/**
 * Shared positioning logic for tab group indicators.
 * Subclasses implement `applyShape` to control the visual output.
 */
declare abstract class BaseTabGroupIndicator implements ITabGroupIndicator {
    protected readonly _ctx: TabGroupIndicatorContext;
    protected readonly _underlines: Map<string, HTMLElement>;
    private _rafId;
    get underlines(): ReadonlyMap<string, HTMLElement>;
    constructor(_ctx: TabGroupIndicatorContext);
    positionUnderlines(): void;
    /**
     * Continuously reposition underlines every frame for the duration
     * of a tab transition (~200ms), so the underline tracks tab sizes.
     */
    trackUnderlines(): void;
    syncUnderlineElements(activeGroupIds: Set<string>): void;
    getUnderline(groupId: string): HTMLElement | undefined;
    dispose(): void;
    /**
     * Apply the visual shape to the underline element.
     * Called once per tab group per frame with the computed geometry.
     */
    protected abstract applyShape(underline: HTMLElement, tg: ITabGroup, startEdge: number, span: number, containerCrossSize: number, activePanelId: string | undefined, containerRect: DOMRect, isVertical: boolean): void;
    private _positionUnderlinesSync;
}
/**
 * Chrome-style wrap-around indicator using SVG paths.
 */
export declare class WrapTabGroupIndicator extends BaseTabGroupIndicator {
    private _applyStraightLine;
    /**
     * Chrome-style wrap-around underline: a stroked SVG path that runs
     * along the bottom (or left edge in vertical mode), curving up and
     * over the active tab with rounded corners.
     *
     * The SVG and path elements are created once per underline and reused;
     * only the `d`, `stroke`, and viewport attributes are updated each frame.
     */
    protected applyShape(underline: HTMLElement, tg: ITabGroup, groupStart: number, groupSpan: number, containerCrossSize: number, activePanelId: string | undefined, containerRect: DOMRect, isVertical: boolean): void;
}
/**
 * Flat continuous bar indicator — no wrap-around, just a colored line
 * spanning the full tab group width.
 */
export declare class NoneTabGroupIndicator extends BaseTabGroupIndicator {
    protected applyShape(underline: HTMLElement, tg: ITabGroup, _startEdge: number, span: number, _containerCrossSize: number, _activePanelId: string | undefined, _containerRect: DOMRect, isVertical: boolean): void;
}
export {};