/****************************************************************************

**

** 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 documentation of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** 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.

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** If you have questions regarding the use of this file, please contact

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** $QT_END_LICENSE$

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****************************************************************************/

//! [0]

    opt.initFrom(q);

        if (down)

        opt.state |= QStyle::State_Sunken;

    if (tristate && noChange)

        opt.state |= QStyle::State_NoChange;

    else

        opt.state |= checked ? QStyle::State_On :

        QStyle::State_Off;

    if (q->testAttribute(Qt::WA_Hover) &&  q->underMouse()) {

        if (hovering)

        opt.state |= QStyle::State_MouseOver;

        else

        opt.state &= ~QStyle::State_MouseOver;

    }

    opt.text = text;

    opt.icon = icon;

    opt.iconSize = q->iconSize();

//! [0]

//! [1]

    state = QStyle::State_None;

    if (widget->isEnabled())

        state |= QStyle::State_Enabled;

    if (widget->hasFocus())

        state |= QStyle::State_HasFocus;

    if (widget->window()->testAttribute(Qt::WA_KeyboardFocusChange))

        state |= QStyle::State_KeyboardFocusChange;

    if (widget->underMouse())

        state |= QStyle::State_MouseOver;

    if (widget->window()->isActiveWindow())

        state |= QStyle::State_Active;

#ifdef Q_WS_MAC

    extern bool qt_mac_can_clickThrough(const QWidget *w); //qwidget_mac.cpp

    if (!(state & QStyle::State_Active) && !qt_mac_can_clickThrough(widget))

        state &= ~QStyle::State_Enabled;

#endif

#ifdef QT_KEYPAD_NAVIGATION

    if (widget->hasEditFocus())

        state |= QStyle::State_HasEditFocus;

#endif

    direction = widget->layoutDirection();

    rect = widget->rect();

    palette = widget->palette();

    fontMetrics = widget->fontMetrics();

//! [1]

//! [2]

    QStylePainter p(this);

    QStyleOptionButton opt = d->getStyleOption();

    p.drawControl(QStyle::CE_CheckBox, opt);

//! [2]

//! [3]

    QStyleOptionButton subopt = *btn;

    subopt.rect = subElementRect(SE_CheckBoxIndicator, btn, widget);

    drawPrimitive(PE_IndicatorCheckBox, &subopt, p, widget);

    subopt.rect = subElementRect(SE_CheckBoxContents, btn, widget);

    drawControl(CE_CheckBoxLabel, &subopt, p, widget);

    if (btn->state & State_HasFocus) {

        QStyleOptionFocusRect fropt;

        fropt.QStyleOption::operator=(*btn);

        fropt.rect = subElementRect(SE_CheckBoxFocusRect, btn, widget);

        drawPrimitive(PE_FrameFocusRect, &fropt, p, widget);

    }

//! [3]

//! [4]

    const QStyleOptionButton *btn = qstyleoption_cast<const QStyleOptionButton *>(opt);

    uint alignment = visualAlignment(btn->direction, Qt::AlignLeft | Qt::AlignVCenter);

    if (!styleHint(SH_UnderlineShortcut, btn, widget))

        alignment |= Qt::TextHideMnemonic;

    QPixmap pix;

    QRect textRect = btn->rect;

    if (!btn->icon.isNull()) {

        pix = btn->icon.pixmap(btn->iconSize, btn->state & State_Enabled ? QIcon::Normal : QIcon::Disabled);

        drawItemPixmap(p, btn->rect, alignment, pix);

        if (btn->direction == Qt::RightToLeft)

            textRect.setRight(textRect.right() - btn->iconSize.width() - 4);

        else

            textRect.setLeft(textRect.left() + btn->iconSize.width() + 4);

    }

    if (!btn->text.isEmpty()){

        drawItemText(p, textRect, alignment | Qt::TextShowMnemonic,

            btn->palette, btn->state & State_Enabled, btn->text, QPalette::WindowText);

    }

//! [4]