qpixeltool.cpp

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/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the tools applications of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
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** If you are unsure which license is appropriate for your use, please
** review the following information:
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** or contact the sales department at [e-mail].
**
** In addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.0, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
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** plug-in the right for the Qt/Eclipse Integration to link to
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****************************************************************************/

#include "qpixeltool.h"

#include <QtAssistant/QAssistantClient>

#include <qapplication.h>
#include <qdesktopwidget.h>
#include <qapplication.h>
#include <qclipboard.h>
#include <qpainter.h>
#include <qevent.h>
#include <qfiledialog.h>
#include <qsettings.h>
#include <qmenu.h>
#include <qactiongroup.h>
#include <QtCore/QLibraryInfo>

#include <qdebug.h>

QPixelTool::QPixelTool(QWidget *parent)
    : QWidget(parent),
      m_assistantClient(0)
{
    QSettings settings(QLatin1String("Trolltech"), QLatin1String("QPixelTool"));

    m_freeze = false;

    m_autoUpdate = settings.value(QLatin1String("autoUpdate"), 0).toBool();

    m_gridSize = settings.value(QLatin1String("gridSize"), 1).toInt();
    m_gridActive = settings.value(QLatin1String("gridActive"), 1).toInt();
    m_displayGridSize = false;
    m_displayGridSizeId = 0;

    m_zoom = settings.value(QLatin1String("zoom"), 4).toInt();
    m_displayZoom = false;
    m_displayZoomId = 0;

    m_currentColor = 0;

    m_mouseDown = false;

    m_initialSize = settings.value(QLatin1String("initialSize"), QSize(250, 200)).toSize();

    move(settings.value(QLatin1String("position")).toPoint());

    setMouseTracking(true);
    setAttribute(Qt::WA_NoBackground);
    m_updateId = startTimer(30);
}

QPixelTool::~QPixelTool()
{
    QSettings settings(QLatin1String("Trolltech"), QLatin1String("QPixelTool"));
    settings.setValue(QLatin1String("autoUpdate"), int(m_autoUpdate));
    settings.setValue(QLatin1String("gridSize"), m_gridSize);
    settings.setValue(QLatin1String("gridActive"), m_gridActive);
    settings.setValue(QLatin1String("zoom"), m_zoom);
    settings.setValue(QLatin1String("initialSize"), size());
    settings.setValue(QLatin1String("position"), pos());
}

void QPixelTool::timerEvent(QTimerEvent *event)
{
    if (event->timerId() == m_updateId && !m_freeze) {
        grabScreen();
    } else if (event->timerId() == m_displayZoomId) {
        killTimer(m_displayZoomId);
        setZoomVisible(false);
    } else if (event->timerId() == m_displayGridSizeId) {
        killTimer(m_displayGridSizeId);
        m_displayGridSize = false;
    }
}

void render_string(QPainter *p, int w, int h, const QString &text, int flags)
{
    p->setBrush(QColor(255, 255, 255, 191));
    p->setPen(Qt::black);
    QRect bounds;
    p->drawText(0, 0, w, h, Qt::TextDontPrint | flags, text, &bounds);

    if (bounds.x() == 0) bounds.adjust(0, 0, 10, 0);
    else bounds.adjust(-10, 0, 0, 0);

    if (bounds.y() == 0) bounds.adjust(0, 0, 0, 10);
    else bounds.adjust(0, -10, 0, 0);

    p->drawRect(bounds);
    p->drawText(bounds, flags, text);
}

void QPixelTool::paintEvent(QPaintEvent *)
{
    QPainter p(this);

    int w = width();
    int h = height();

    if (m_zoom <= 4) {
        int wext = width() % m_zoom;
        int hext = height() % m_zoom;
        p.drawPixmap(0, 0, width() + wext, height() + hext, m_buffer);
    } else {
        p.setPen(Qt::NoPen);
        QImage im = m_buffer.toImage().convertToFormat(QImage::Format_RGB32);
        for (int y=0; y<h; y+=m_zoom) {
            int y_px = qMin(im.height()-1, y/m_zoom);
            for (int x=0; x<w; x+=m_zoom) {
                int x_px = qMin(im.width()-1, x/m_zoom);
                p.setBrush(QColor(im.pixel(x_px, y_px)));
                p.drawRect(x, y, m_zoom, m_zoom);
            }
        }
    }

    // Draw the grid on top.
    if (m_gridActive) {
        p.setPen(m_gridActive == 1 ? Qt::black : Qt::white);
        int incr = m_gridSize * m_zoom;
        for (int x=0; x<w; x+=incr)
            p.drawLine(x, 0, x, h);
        for (int y=0; y<h; y+=incr)
            p.drawLine(0, y, w, y);
    }

    QFont f(QLatin1String("courier"));
    f.setBold(true);
    p.setFont(f);

    if (m_displayZoom) {
        render_string(&p, w, h,
                      QString(QLatin1String("Zoom: x%1")).arg(m_zoom),
                      Qt::AlignBottom | Qt::AlignRight);
    }

    if (m_displayGridSize) {
        render_string(&p, w, h,
                      QString(QLatin1String("Grid size: %1")).arg(m_gridSize),
                      Qt::AlignBottom | Qt::AlignLeft);
    }

    if (m_freeze) {
        QString str;
        str.sprintf("Pixel: %6X\nRed:   %3d\nGreen: %3d\nBlue:  %3d",
                    0x00ffffff & m_currentColor,
                    (0x00ff0000 & m_currentColor) >> 16,
                    (0x0000ff00 & m_currentColor) >> 8,
                    (0x000000ff & m_currentColor));
        render_string(&p, w, h,
                      str,
                      Qt::AlignTop | Qt::AlignLeft);
    }

    if (m_mouseDown && m_dragStart != m_dragCurrent) {
        int x1 = (m_dragStart.x() / m_zoom) * m_zoom;
        int y1 = (m_dragStart.y() / m_zoom) * m_zoom;
        int x2 = (m_dragCurrent.x() / m_zoom) * m_zoom;
        int y2 = (m_dragCurrent.y() / m_zoom) * m_zoom;
        QRect r = QRect(x1, y1, x2 - x1, y2 - y1).normalized();
        p.setBrush(Qt::NoBrush);
        p.setPen(QPen(Qt::red, 3, Qt::SolidLine));
        p.drawRect(r);
        p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
        p.drawRect(r);

        QString str;
        str.sprintf("Rect: x=%d, y=%d, w=%d, h=%d",
                    r.x() / m_zoom,
                    r.y() / m_zoom,
                    r.width() / m_zoom,
                    r.height() / m_zoom);
        render_string(&p, w, h, str, Qt::AlignBottom | Qt::AlignLeft);
    }


}

void QPixelTool::keyPressEvent(QKeyEvent *e)
{
    switch (e->key()) {
    case Qt::Key_Space:
        toggleFreeze();
        break;
    case Qt::Key_Plus:
        setZoom(m_zoom + 1);
        break;
    case Qt::Key_Minus:
        setZoom(m_zoom - 1);
        break;
    case Qt::Key_PageUp:
        setGridSize(m_gridSize + 1);
        break;
    case Qt::Key_PageDown:
        setGridSize(m_gridSize - 1);
        break;
    case Qt::Key_G:
        toggleGrid();
        break;
    case Qt::Key_A:
        m_autoUpdate = !m_autoUpdate;
        break;
    case Qt::Key_C:
        if (e->modifiers() & Qt::ControlModifier)
            copyToClipboard();
        break;
    case Qt::Key_S:
        if (e->modifiers() & Qt::ControlModifier) {
            releaseKeyboard();
            saveToFile();
        }
        break;
    case Qt::Key_Control:
        grabKeyboard();
        break;
    case Qt::Key_F1:
        showHelp();
        break;
    }
}

void QPixelTool::keyReleaseEvent(QKeyEvent *e)
{
    switch(e->key()) {
    case Qt::Key_Control:
        releaseKeyboard();
        break;
    default: