import type { WatermarkFormat } from './WatermarkFormat';
import type { EditorPlugin, IEditor, PluginEvent } from 'roosterjs-content-model-types';
/**
 * A watermark plugin to manage watermark string for roosterjs
 */
export declare class WatermarkPlugin implements EditorPlugin {
    protected watermark: string;
    private editor;
    private format;
    private isShowing;
    private darkTextColor;
    private disposer;
    /**
     * Create an instance of Watermark plugin
     * @param watermark The watermark string
     */
    constructor(watermark: string, format?: WatermarkFormat);
    /**
     * Get a friendly name of  this plugin
     */
    getName(): string;
    /**
     * Initialize this plugin. This should only be called from Editor
     * @param editor Editor instance
     */
    initialize(editor: IEditor): void;
    /**
     * Dispose this plugin
     */
    dispose(): void;
    /**
     * Handle events triggered from editor
     * @param event PluginEvent object
     */
    onPluginEvent(event: PluginEvent): void;
    private onCompositionStart;
    private update;
    private showHide;
    protected show(editor: IEditor): void;
    private applyWatermarkStyle;
    protected hide(editor: IEditor): void;
}