codetextedit.h

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/*
    CodeTextEdit: Text edit widget with line numbers and highlighted current line.
    SPDX-FileCopyrightText: 2010 Nokia Corporation and /or its subsidiary(-ies) <qt-info@nokia.com>
    Code based on examples of the Qt Toolkit under BSD license,
    <http://doc.qt.nokia.com/4.6/widgets-codeeditor.html>.
    SPDX-FileCopyrightText: 2010 Umbrello UML Modeller Authors <umbrello-devel@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
 
#ifndef CODETEXTEDIT_H
#define CODETEXTEDIT_H
 
#include <QObject>
#include <QPlainTextEdit>
 
class QPaintEvent;
class QResizeEvent;
class QSize;
class QWidget;
 
class CodeTextHighlighter;
class LineNumberArea;
 
class CodeTextEdit : public QPlainTextEdit
{
    Q_OBJECT
 
public:
    explicit CodeTextEdit(QWidget *parent = 0);
 
    void lineNumberAreaPaintEvent(QPaintEvent *event);
    int lineNumberAreaWidth();
 
protected:
    void resizeEvent(QResizeEvent *event);
 
private slots:
    void updateLineNumberAreaWidth(int newBlockCount);
    void highlightCurrentLine();
    void updateLineNumberArea(const QRect &, int);
 
private:
    QWidget *m_lineNumberArea;
    CodeTextHighlighter *m_highlighter;
};
 
 
class LineNumberArea : public QWidget
{
public:
    explicit LineNumberArea(CodeTextEdit *editor) : QWidget(editor) {
        m_codeEditor = editor;
    }
 
    QSize sizeHint() const {
        return QSize(m_codeEditor->lineNumberAreaWidth(), 0);
    }
 
protected:
    void paintEvent(QPaintEvent *event) {
        m_codeEditor->lineNumberAreaPaintEvent(event);
    }
 
private:
    CodeTextEdit *m_codeEditor;
};
 
#endif // CODETEXTBOX_H