import { DisposableCollection } from '@theia/core/lib/common/disposable';
import { Emitter } from '@theia/core/lib/common/event';
import { CancellationTokenSource } from '@theia/core/lib/common/cancellation';
import { ScmService } from './scm-service';
import { ScmHistoryItem, ScmHistoryProvider } from './scm-provider';
import { GraphRow } from './scm-history-graph-lanes';
export declare const PAGE_SIZE = 50;
export interface HistoryGraphEntry {
    readonly item: ScmHistoryItem;
    readonly graphRow: GraphRow;
}
export declare class ScmHistoryGraphModel {
    protected readonly scmService: ScmService;
    protected readonly toDispose: DisposableCollection;
    protected readonly toDisposeOnProviderChange: DisposableCollection;
    protected _entries: HistoryGraphEntry[];
    protected _hasMore: boolean;
    protected _loading: boolean;
    protected _hasAttemptedLoad: boolean;
    protected _provider: ScmHistoryProvider | undefined;
    protected readonly onDidChangeEmitter: Emitter<void>;
    readonly onDidChange: import("@theia/core/lib/common/event").Event<void>;
    protected cancelSource: CancellationTokenSource;
    protected init(): void;
    dispose(): void;
    get provider(): ScmHistoryProvider | undefined;
    get entries(): readonly HistoryGraphEntry[];
    get hasMore(): boolean;
    get loading(): boolean;
    /**
     * Returns true once the model has completed at least one load attempt
     * (regardless of whether history items were found). This is used by
     * the widget to distinguish "still initializing" from "no history".
     */
    get hasAttemptedLoad(): boolean;
    refresh(): void;
    loadMore(): Promise<void>;
    protected loadPage(): Promise<void>;
    /**
     * Returns the revisions of the current branch ref, its remote tracking ref,
     * and the merge-base ref to pass to `provideHistoryItems`. Providers walk
     * history starting from these revisions.
     */
    protected getCurrentHistoryItemRefs(): string[];
}
//# sourceMappingURL=scm-history-graph-model.d.ts.map