File indexing completed on 2024-04-21 04:59:18

 // SPDX-FileCopyrightText: 2020 Carl Schwan <carl@carlschwan.eu>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
 #include <QObject>
 #include <QQmlEngine>
 #include <QQuickTextDocument>
 #include <QTextCursor>
 
 #include "chatbarcache.h"
 #include "models/completionmodel.h"
 #include "neochatroom.h"
 
 class NeoChatRoom;
 class SyntaxHighlighter;
 
 /**
  * @class ChatDocumentHandler
  *
  * Handle the QQuickTextDocument of a qml text item.
  *
  * The class provides functionality to highlight text in the text document as well
  * as providing completion functionality via a CompletionModel.
  *
  * The ChatDocumentHandler is also linked to a NeoChatRoom to provide functionality
  * to save the chat document text when switching between rooms.
  *
  * To get the full functionality the cursor position and text selection information
  * need to be passed in. For example:
  *
  * @code{.qml}
  * import QtQuick 2.0
  * import QtQuick.Controls 2.15 as QQC2
  *
  * import org.kde.kirigami 2.12 as Kirigami
  * import org.kde.neochat 1.0
  *
  * QQC2.TextArea {
  *      id: textField
  *
  *      // Set this to a NeoChatRoom object.
  *      property var room
  *
  *      ChatDocumentHandler {
  *          id: documentHandler
  *          document: textField.textDocument
  *          cursorPosition: textField.cursorPosition
  *          selectionStart: textField.selectionStart
  *          selectionEnd: textField.selectionEnd
  *          mentionColor: Kirigami.Theme.linkColor
  *          errorColor: Kirigami.Theme.negativeTextColor
  *          room: textField.room
  *      }
  * }
  * @endcode
  *
  * @sa QQuickTextDocument, CompletionModel, NeoChatRoom
  */
 class ChatDocumentHandler : public QObject
 {
     Q_OBJECT
     QML_ELEMENT
 
     /**
      * @brief The QQuickTextDocument that is being handled.
      */
     Q_PROPERTY(QQuickTextDocument *document READ document WRITE setDocument NOTIFY documentChanged)
 
     /**
      * @brief The current saved cursor position.
      */
     Q_PROPERTY(int cursorPosition READ cursorPosition WRITE setCursorPosition NOTIFY cursorPositionChanged)
 
     /**
      * @brief The start position of any currently selected text.
      */
     Q_PROPERTY(int selectionStart READ selectionStart WRITE setSelectionStart NOTIFY selectionStartChanged)
 
     /**
      * @brief The end position of any currently selected text.
      */
     Q_PROPERTY(int selectionEnd READ selectionEnd WRITE setSelectionEnd NOTIFY selectionEndChanged)
 
     /**
      * @brief The current CompletionModel.
      *
      * This is typically provided to a qml component to visualise the current
      * completion results.
      */
     Q_PROPERTY(CompletionModel *completionModel READ completionModel CONSTANT)
 
     /**
      * @brief The current room that the the text document is being handled for.
      */
     Q_PROPERTY(NeoChatRoom *room READ room WRITE setRoom NOTIFY roomChanged)
 
     /**
      * @brief The cache for the chat bar the text document is being handled for.
      */
     Q_PROPERTY(ChatBarCache *chatBarCache READ chatBarCache WRITE setChatBarCache NOTIFY chatBarCacheChanged)
 
     /**
      * @brief The color to highlight user mentions.
      */
     Q_PROPERTY(QColor mentionColor READ mentionColor WRITE setMentionColor NOTIFY mentionColorChanged)
 
     /**
      * @brief The color to highlight spelling errors.
      */
     Q_PROPERTY(QColor errorColor READ errorColor WRITE setErrorColor NOTIFY errorColorChanged)
 
 public:
     explicit ChatDocumentHandler(QObject *parent = nullptr);
 
     [[nodiscard]] QQuickTextDocument *document() const;
     void setDocument(QQuickTextDocument *document);
 
     [[nodiscard]] int cursorPosition() const;
     void setCursorPosition(int position);
 
     [[nodiscard]] int selectionStart() const;
     void setSelectionStart(int position);
 
     [[nodiscard]] int selectionEnd() const;
     void setSelectionEnd(int position);
 
     [[nodiscard]] NeoChatRoom *room() const;
     void setRoom(NeoChatRoom *room);
 
     [[nodiscard]] ChatBarCache *chatBarCache() const;
     void setChatBarCache(ChatBarCache *chatBarCache);
 
     Q_INVOKABLE void complete(int index);
 
     CompletionModel *completionModel() const;
 
     [[nodiscard]] QColor mentionColor() const;
     void setMentionColor(const QColor &color);
 
     [[nodiscard]] QColor errorColor() const;
     void setErrorColor(const QColor &color);
 
 Q_SIGNALS:
     void documentChanged();
     void cursorPositionChanged();
     void roomChanged();
     void chatBarCacheChanged();
     void selectionStartChanged();
     void selectionEndChanged();
     void errorColorChanged();
     void mentionColorChanged();
 
 private:
     int completionStartIndex() const;
 
     QPointer<QQuickTextDocument> m_document;
 
     QPointer<NeoChatRoom> m_room;
     QPointer<ChatBarCache> m_chatBarCache;
 
     QColor m_mentionColor;
     QColor m_errorColor;
 
     int m_cursorPosition;
     int m_selectionStart;
     int m_selectionEnd;
 
     QString getText() const;
     void pushMention(const Mention mention) const;
 
     SyntaxHighlighter *m_highlighter = nullptr;
 
     CompletionModel *m_completionModel = nullptr;
 };