import type { ConversationViewport } from "../rendering/conversation-viewport.js";
import type { EditorLayoutRenderer } from "../rendering/editor-layout-renderer.js";
import type { Entry, RenderedLine } from "../types.js";
export type AppScrollMetrics = {
    bodyHeight: number;
    viewportColumns: number;
    conversationLineCount: number;
    maxScroll: number;
    start: number;
};
export type ConversationTextScrollTarget = {
    entryId?: string;
    needles: readonly string[];
};
export type AppScrollState = {
    scrollFromBottom: number;
    detachedScrollStart?: number;
};
export type AppScrollControllerHost = {
    conversationViewport(): ConversationViewport;
    editorLayoutRenderer(): EditorLayoutRenderer;
    terminalColumns(): number;
    terminalRows(): number;
    tabPanelRows(terminalRows: number): number;
    hasOlderSessionHistory?(): boolean;
    isLoadingOlderSessionHistory?(): boolean;
    loadOlderSessionHistory?(options?: {
        render?: boolean;
        onPrependedEntries?: (entries: readonly Entry[]) => void;
    }): Promise<boolean>;
    hasNewerSessionHistory?(): boolean;
    isLoadingNewerSessionHistory?(): boolean;
    loadNewerSessionHistory?(options?: {
        render?: boolean;
    }): Promise<boolean>;
    render(): void;
};
export declare class AppScrollController {
    private readonly host;
    private scrollFromBottom;
    private detachedScrollStart;
    private readonly olderHistoryThresholdLines;
    constructor(host: AppScrollControllerHost);
    reset(): void;
    scrollToBottom(): boolean;
    scrollToTop(): boolean;
    scrollToAbsoluteTop(): Promise<boolean>;
    scrollToAbsoluteBottom(): Promise<boolean>;
    quickScrollDirections(columns: number, bodyHeight: number): {
        up: boolean;
        down: boolean;
    };
    captureState(): AppScrollState;
    restoreState(state: AppScrollState): void;
    conversationView(columns: number, bodyHeight: number): {
        lines: RenderedLine[];
        metrics: AppScrollMetrics;
    };
    visibleConversationLines(columns: number, bodyHeight: number): RenderedLine[];
    scrollMetrics(columns: number, bodyHeight: number): AppScrollMetrics;
    scrollByPage(direction: -1 | 1): void;
    scrollByLines(delta: number, options?: {
        render?: boolean;
    }): boolean;
    private shouldLoadOlderHistory;
    private shouldLoadNewerHistory;
    private loadOlderHistoryAnchored;
    private loadNewerHistoryAnchored;
    adjustForHistoryWindowPrune(edge: "top" | "bottom", lineCount: number): void;
    scrollToConversationEntry(entryId: string): boolean;
    scrollToConversationText(target: ConversationTextScrollTarget): boolean;
    private setScrollStart;
    private viewportColumns;
}