utils/themeeditor/gui/codeeditor.h

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 * This file has been copied from Nokia's Qt Examples, with minor modifications
 * made available under the LGPL version 2.1, as the original file was licensed
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
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****************************************************************************/

#ifndef CODEEDITOR_H
#define CODEEDITOR_H

#include <QPlainTextEdit>
#include <QObject>
#include <QSettings>

#include "syntaxcompleter.h"

QT_BEGIN_NAMESPACE
class QPaintEvent;
class QResizeEvent;
class QSize;
class QWidget;
QT_END_NAMESPACE

class LineNumberArea;

class CodeEditor : public QPlainTextEdit
{
    Q_OBJECT

public:
    CodeEditor(QWidget *parent = 0);
    virtual ~CodeEditor(){ }

    void lineNumberAreaPaintEvent(QPaintEvent *event);
    int lineNumberAreaWidth();
    void addError(int line){ errors.append(line); }
    void clearErrors(){ errors.clear(); }
    void setErrorColor(QColor color){ errorColor = color; }
    bool isError(int line){ return errors.contains(line); }
    bool hasErrors(){ return !errors.isEmpty(); }

protected:
    void resizeEvent(QResizeEvent *event);
    void keyPressEvent(QKeyEvent *event);

private slots:
    void updateLineNumberAreaWidth(int newBlockCount);
    void updateLineNumberArea(const QRect &, int);
    void cursorMoved();
    void insertTag();

private:
    QWidget *lineNumberArea;
    QList<int> errors;
    QColor errorColor;
    SyntaxCompleter completer;
    QSettings settings;

    int tagBegin;
    int tagEnd;
    int docLength;
};

class LineNumberArea : public QWidget
{
public:
    LineNumberArea(CodeEditor *editor) : QWidget(editor) {
        codeEditor = editor;
    }

    QSize sizeHint() const {
        return QSize(codeEditor->lineNumberAreaWidth(), 0);
    }

protected:
    void paintEvent(QPaintEvent *event) {
        codeEditor->lineNumberAreaPaintEvent(event);
    }

private:
    CodeEditor *codeEditor;
};

#endif