import { EditorState } from './editor-state.svelte';
/**
 * Slide-background actions for the ribbon's Design tab "Format Background"
 * panel, split out of `EditorState` to keep it under the repo's 300-LOC
 * budget (mirrors `EditorSlidesController` / `EditorArrangeController`).
 *
 * Solid-colour fill only (matches the docked panel's scope: a single colour
 * input); clearing removes every background field so the slide falls back to
 * its layout/master background. Both mutations route through
 * `EditorState.commitSlides`, so they are history-integrated (undoable) like
 * every other ribbon mutation.
 */
export declare class EditorBackgroundController {
    #private;
    constructor(editor: EditorState);
    /** Set the current slide's background to a solid colour. */
    setSlideBackgroundColor(color: string): void;
    /** Clear every background field on the current slide (fall back to layout/master). */
    clearSlideBackground(): void;
}
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