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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/****************************************************************************
 **
 ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
 **     of its contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
#pragma once

#include <QPlainTextEdit>
#include <QObject>

class QPaintEvent;
class QResizeEvent;
class QSize;
class QWidget;

class LineNumberArea;

class CodeEditor
	: public QPlainTextEdit
{
	Q_OBJECT

public:
	CodeEditor(QWidget *parent = 0);

	void lineNumberAreaPaintEvent(QPaintEvent *event);
	int lineNumberAreaWidth();

protected:
	void resizeEvent(QResizeEvent *event);

public slots:
	void runningLine(int lineno);
	void errorLine(QString file, int lineno, QString msg);

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

private:
	QWidget *lineNumberArea;
	int lineNumber;
	int errorLineNumber{0};
};

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;
};