import { TaskEntity } from './types';
export type GanttBarInteractionMode = 'move' | 'resize-start' | 'resize-end' | 'resize-progress';
/**
 * Convert horizontal pointer movement into a whole-day timeline delta.
 *
 * The conversion uses the active timeline scale so coarse zoom presets still
 * move tasks by calendar days rather than raw ticks.
 */
export declare function pixelDeltaToDays(pixelDelta: number, tickWidth: number, tickCountDays: number): number;
/**
 * Return a copy of a task with dates adjusted for a bar interaction.
 *
 * Move shifts both dates. Start resize clamps to the current end date. End
 * resize clamps to the current start date.
 */
export declare function applyTaskBarInteraction(task: TaskEntity, mode: GanttBarInteractionMode, dayDelta: number): TaskEntity;
/**
 * Return a copy of a task with progress clamped into the valid percentage range.
 *
 * The helper is intentionally pure so pointer math can stay in the plugin while
 * task mutation rules remain testable and reusable.
 */
export declare function applyTaskProgressInteraction(task: TaskEntity, progressPercent: number): TaskEntity;
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