/**
 * Copyright Aquera Inc 2023
 *
 * This source code is licensed under the BSD-3-Clause license found in the
 * LICENSE file in the root directory of this source tree.
 */
import NileElement from '../internal/nile-element';
import '../nile-markdown/nile-markdown';
import '../nile-icon';
import '../nile-button-toggle-group/nile-button-toggle-group';
import '../nile-button-toggle/nile-button-toggle';
import '../nile-dropdown/nile-dropdown';
import '../nile-menu/nile-menu';
import '../nile-menu-item/nile-menu-item';
import type { CSSResultGroup, TemplateResult } from 'lit';
export type MarkdownEditorMode = 'write' | 'preview' | 'split';
/**
 * Nile markdown editor component.
 *
 * @tag nile-markdown-editor
 */
/**
 * @summary A GitHub-style markdown editor with a formatting toolbar and a
 * live preview rendered by `nile-markdown`.
 * @status experimental
 *
 * @dependency nile-markdown
 * @dependency nile-icon
 * @dependency nile-glyph
 * @dependency nile-button-toggle-group
 * @dependency nile-button-toggle
 *
 * @attr {string} tools - JSON-array allowlist of toolbar tools to show, e.g.
 * `tools='["bold","italic","link"]'`. Valid names: heading, bold, italic,
 * strikethrough, quote, code, ul, ol, link. Empty shows all.
 *
 * @event nile-input - Emitted with `{ value }` on every keystroke or toolbar action.
 * @event nile-change - Emitted with `{ value }` when the editor loses focus after an edit.
 * @event nile-mode-change - Emitted with `{ mode }` when the write/preview/split mode changes.
 *
 * @csspart base - The component's base wrapper.
 * @csspart header - The header containing the tabs and toolbar.
 * @csspart toolbar - The formatting toolbar.
 * @csspart textarea - The markdown source textarea.
 * @csspart preview - The rendered preview pane.
 */
export declare class NileMarkdownEditor extends NileElement {
    static styles: CSSResultGroup;
    /** The markdown source. */
    value: string;
    /** Placeholder shown when the editor is empty. */
    placeholder: string;
    /** Disables the editor. */
    disabled: boolean;
    /** Makes the source read-only while still allowing mode switching. */
    readonly: boolean;
    /** Number of visible text rows in write mode. */
    rows: number;
    /** Active view: `write`, `preview`, or `split`. */
    mode: MarkdownEditorMode;
    /** Hides the formatting toolbar. */
    hideToolbar: boolean;
    /**
     * Allowlist of toolbar tool names to show. Accepts a JSON array via the
     * `tools` attribute (e.g. `tools='["bold","italic","link"]'`), a
     * comma-separated string, or an array when set as a property. When empty
     * (default) every tool is shown. Valid names: `heading`, `bold`, `italic`,
     * `strikethrough`, `quote`, `code`, `ul`, `ol`, `link`.
     */
    tools: string[];
    /** Parsed allowlist, or `null` when no allowlist is set (show everything). */
    private get allowedTools();
    /** Toolbar groups after applying the allowlist; empty groups are dropped. */
    private get visibleGroups();
    private textarea?;
    private bodyEl?;
    /**
     * Fraction of the body width given to the write pane in split mode
     * (the rest goes to the preview). Clamped to a sensible range while
     * dragging the splitter.
     */
    private splitRatio;
    /** Whether the split divider is currently being dragged. */
    private splitDragging;
    /** Begins a pointer-driven resize of the split divider. */
    private startSplitDrag;
    /** Resets the splitter to a 50/50 layout (double-click affordance). */
    private resetSplit;
    /** Moves focus to the textarea. */
    focus(options?: FocusOptions): void;
    blur(): void;
    private setMode;
    private handleInput;
    private handleChange;
    private handleKeydown;
    /** Replaces the current selection and restores focus/selection. */
    private replaceSelection;
    /** Wraps (or unwraps) the selection with prefix/suffix delimiters. */
    private applyWrap;
    /** Toggles a markdown prefix on every line in the selection. */
    private applyLinePrefix;
    /** Inserts a `[text](url)` link, selecting the URL for quick editing. */
    private insertLink;
    private runAction;
    /** Applies a heading-style line prefix chosen from a dropdown menu. */
    private runMenuItem;
    /** Renders the glyph/icon shown inside a toolbar control. */
    private renderActionContent;
    /** A standard click-to-apply toolbar button. */
    private renderActionButton;
    /** A toolbar control that opens a dropdown of line-prefix choices. */
    private renderMenuAction;
    private renderToolbar;
    render(): TemplateResult;
}
export default NileMarkdownEditor;
declare global {
    interface HTMLElementTagNameMap {
        'nile-markdown-editor': NileMarkdownEditor;
    }
}