Move the remaining functionality of ChatDocumentHandler to ChatTextItemHelper or split into own objects

src/libneochat/chatkeyhelper.h

@@ -0,0 +1,87 @@
+// SPDX-FileCopyrightText: 2025 James Graham <james.h.graham@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
+#pragma once
+
+#include <QObject>
+#include <QQmlEngine>
+
+#include "chattextitemhelper.h"
+
+class ChatKeyHelper : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+public:
+    explicit ChatKeyHelper(QObject *parent = nullptr);
+
+    ChatTextItemHelper *textItem() const;
+    void setTextItem(ChatTextItemHelper *textItem);
+
+    /**
+     * @brief Handle up key at current cursor location.
+     */
+    Q_INVOKABLE void up();
+
+    /**
+     * @brief Handle down key at current cursor location.
+     */
+    Q_INVOKABLE void down();
+
+    /**
+     * @brief Handle tab key at current cursor location.
+     */
+    Q_INVOKABLE void tab();
+
+    /**
+     * @brief Handle delete key at current cursor location.
+     */
+    Q_INVOKABLE void deleteChar();
+
+    /**
+     * @brief Handle backspace key at current cursor location.
+     */
+    Q_INVOKABLE void backspace();
+
+    /**
+     * @brief Handle return key at current cursor location.
+     */
+    Q_INVOKABLE void insertReturn();
+
+Q_SIGNALS:
+    void textItemChanged();
+
+    /**
+     * @brief There is an unhandled up key press.
+     *
+     * i.e. up is pressed on the first line of the first block of the text item.
+     */
+    void unhandledUp();
+
+    /**
+     * @brief There is an unhandled down key press.
+     *
+     * i.e. down is pressed on the last line of the last block of the text item.
+     */
+    void unhandledDown();
+
+    /**
+     * @brief There is an unhandled delete key press.
+     *
+     * i.e. delete is pressed at the end of the last line of the last block of the
+     * text item.
+     */
+    void unhandledDelete();
+
+    /**
+     * @brief There is an unhandled backspace key press.
+     *
+     * i.e. backspace is pressed at the beginning of the first line of the first
+     * block of the text item.
+     */
+    void unhandledBackspace();
+
+private:
+    QPointer<ChatTextItemHelper> m_textItem;
+};