anki/ts/editor/editable.ts

// Copyright: Ankitects Pty Ltd and contributors
// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

import { nodeIsInline } from "./helpers";

function containsInlineContent(field: Element): boolean {
    if (field.childNodes.length === 0) {
        // for now, for all practical purposes, empty fields are in block mode
        return false;
    }

    for (const child of field.children) {
        if (!nodeIsInline(child)) {
            return false;
        }
    }

    return true;
}

export class Editable extends HTMLElement {
    set fieldHTML(content: string) {
        this.innerHTML = content;

        if (containsInlineContent(this)) {
            this.appendChild(document.createElement("br"));
        }
    }

    get fieldHTML(): string {
        return containsInlineContent(this) && this.innerHTML.endsWith("<br>")
            ? this.innerHTML.slice(0, -4) // trim trailing <br>
            : this.innerHTML;
    }

    connectedCallback() {
        this.setAttribute("contenteditable", "");
    }
}