utils/themeeditor/gui/codeeditor.cpp

/***************************************************************************
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 * $Id$
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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
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/

#include <QtGui>

#include "codeeditor.h"

//![constructor]

CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
{
    lineNumberArea = new LineNumberArea(this);

    connect(this, SIGNAL(blockCountChanged(int)),
            this, SLOT(updateLineNumberAreaWidth(int)));
    connect(this, SIGNAL(updateRequest(QRect,int)),
            this, SLOT(updateLineNumberArea(QRect,int)));

    updateLineNumberAreaWidth(0);
}

//![constructor]

//![extraAreaWidth]

int CodeEditor::lineNumberAreaWidth()
{
    int digits = 1;
    int max = qMax(1, blockCount());
    while (max >= 10) {
        max /= 10;
        ++digits;
    }

    int space = 3 + fontMetrics().width(QLatin1Char('9')) * digits;

    return space;
}

//![extraAreaWidth]

//![slotUpdateExtraAreaWidth]

void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
{ 
    setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
}

//![slotUpdateExtraAreaWidth]

//![slotUpdateRequest]

void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
{
    if (dy)
        lineNumberArea->scroll(0, dy);
    else
        lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());

    if (rect.contains(viewport()->rect()))
        updateLineNumberAreaWidth(0);
}

//![slotUpdateRequest]

//![resizeEvent]

void CodeEditor::resizeEvent(QResizeEvent *e)
{
    QPlainTextEdit::resizeEvent(e);

    QRect cr = contentsRect();
    lineNumberArea->setGeometry(QRect(cr.left(), cr.top(),
                                      lineNumberAreaWidth(), cr.height()));
}

//![resizeEvent]

//![extraAreaPaintEvent_0]

void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
{
    QPainter painter(lineNumberArea);
    painter.fillRect(event->rect(), Qt::lightGray);

//![extraAreaPaintEvent_0]

//![extraAreaPaintEvent_1]
    QTextBlock block = firstVisibleBlock();
    int blockNumber = block.blockNumber();
    int top = (int) blockBoundingGeometry(block).translated(contentOffset()).top();
    int bottom = top + (int) blockBoundingRect(block).height();
//![extraAreaPaintEvent_1]

//![extraAreaPaintEvent_2]
    while (block.isValid() && top <= event->rect().bottom()) {
        if (block.isVisible() && bottom >= event->rect().top()) {
            QString number = QString::number(blockNumber + 1);
            /* Drawing an error circle if necessary */
            if(errors.contains(blockNumber + 1))
            {
                painter.fillRect(QRect(0, top, lineNumberArea->width(),
                                       fontMetrics().height()), errorColor);
            }
            painter.setPen(Qt::black);
            painter.drawText(0, top, lineNumberArea->width(),
                             fontMetrics().height(), Qt::AlignRight, number);
        }

        block = block.next();
        top = bottom;
        bottom = top + (int) blockBoundingRect(block).height();
        ++blockNumber;
    }
}
//![extraAreaPaintEvent_2]