src/gui/widgets/qabstractbutton.cpp

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/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module 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:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "qabstractbutton.h"
#include "qbuttongroup.h"
#include "qabstractbutton_p.h"
#include "qevent.h"
#include "qpainter.h"
#include "qapplication.h"
#include "qstyle.h"
#include "qaction.h"
#ifndef QT_NO_ACCESSIBILITY
#include "qaccessible.h"
#endif

#define AUTO_REPEAT_DELAY  300
#define AUTO_REPEAT_INTERVAL 100


QAbstractButtonPrivate::QAbstractButtonPrivate()
    :
#ifndef QT_NO_SHORTCUT
    shortcutId(0),
#endif
    checkable(false), checked(false), autoRepeat(false), autoExclusive(false),
    down(false), blockRefresh(false),
#ifndef QT_NO_BUTTONGROUP
    group(0),
#endif
    autoRepeatDelay(AUTO_REPEAT_DELAY),
    autoRepeatInterval(AUTO_REPEAT_INTERVAL)
{}

#ifndef QT_NO_BUTTONGROUP

class QButtonGroupPrivate: public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QButtonGroup)

public:
    QButtonGroupPrivate():exclusive(true){}
    QList<QAbstractButton *> buttonList;
    QPointer<QAbstractButton> checkedButton;
    void detectCheckedButton();
    void notifyChecked(QAbstractButton *button);
    bool exclusive;
    QMap<QAbstractButton*, int> mapping;
};

QButtonGroup::QButtonGroup(QObject *parent)
    : QObject(*new QButtonGroupPrivate, parent)
{
}

QButtonGroup::~QButtonGroup()
{
    Q_D(QButtonGroup);
    for (int i = 0; i < d->buttonList.count(); ++i)
        d->buttonList.at(i)->d_func()->group = 0;
}


bool QButtonGroup::exclusive() const
{
    Q_D(const QButtonGroup);
    return d->exclusive;
}

void QButtonGroup::setExclusive(bool exclusive)
{
    Q_D(QButtonGroup);
    d->exclusive = exclusive;
}

void QButtonGroup::addButton(QAbstractButton *button)
{
    addButton(button, -1);
}

void QButtonGroup::addButton(QAbstractButton *button, int id)
{
    Q_D(QButtonGroup);
    if (QButtonGroup *previous = button->d_func()->group)
        previous->removeButton(button);
    button->d_func()->group = this;
    d->buttonList.append(button);
    if (id != -1)
        d->mapping[button] = id;
    if (d->exclusive && button->isChecked())
        button->d_func()->notifyChecked();
}

void QButtonGroup::removeButton(QAbstractButton *button)
{
    Q_D(QButtonGroup);
    if (d->checkedButton == button) {
        d->detectCheckedButton();
    }
    if (button->d_func()->group == this) {
        button->d_func()->group = 0;
        d->buttonList.removeAll(button);
        d->mapping.remove(button);
    }
}

QList<QAbstractButton*> QButtonGroup::buttons() const
{
    Q_D(const QButtonGroup);
    return d->buttonList;
}

QAbstractButton *QButtonGroup::checkedButton() const
{
    Q_D(const QButtonGroup);
    return d->checkedButton;
}

QAbstractButton *QButtonGroup::button(int id) const
{
    Q_D(const QButtonGroup);
    return d->mapping.key(id);
}

void QButtonGroup::setId(QAbstractButton *button, int id)
{
    Q_D(QButtonGroup);
    if (button && id != -1)
        d->mapping[button] = id;
}

int QButtonGroup::id(QAbstractButton *button) const
{
    Q_D(const QButtonGroup);
    return d->mapping.value(button, -1);
}

int QButtonGroup::checkedId() const
{
    Q_D(const QButtonGroup);
    return d->mapping.value(d->checkedButton, -1);
}

// detect a checked button other than the current one
void QButtonGroupPrivate::detectCheckedButton()
{
    QAbstractButton *previous = checkedButton;
    checkedButton = 0;
    if (exclusive)
        return;
    for (int i = 0; i < buttonList.count(); i++) {
        if (buttonList.at(i) != previous && buttonList.at(i)->isChecked()) {
            checkedButton = buttonList.at(i);
            return;
        }
    }
}

#endif // QT_NO_BUTTONGROUP

QList<QAbstractButton *>QAbstractButtonPrivate::queryButtonList() const
{
#ifndef QT_NO_BUTTONGROUP
    if (group)
        return group->d_func()->buttonList;
#endif

    Q_Q(const QAbstractButton);
    QList<QAbstractButton*>candidates;
    if (q->parentWidget() && autoExclusive) {
        candidates =  qFindChildren<QAbstractButton *>(q->parentWidget());
        for (int i = candidates.count() - 1; i >= 0; --i) {
            QAbstractButton *candidate = candidates.at(i);
            if (!candidate->autoExclusive()
#ifndef QT_NO_BUTTONGROUP
                || candidate->group()
#endif
                )
                candidates.removeAt(i);
        }
    }
    return candidates;
}

QAbstractButton *QAbstractButtonPrivate::queryCheckedButton() const
{
#ifndef QT_NO_BUTTONGROUP
    if (group)
        return group->d_func()->checkedButton;
#endif

    Q_Q(const QAbstractButton);
    QList<QAbstractButton *> buttonList = queryButtonList();
    if (buttonList.count() == 1) // no group
        return 0;

    for (int i = 0; i < buttonList.count(); ++i) {
        QAbstractButton *b = buttonList.at(i);
        if (b->d_func()->checked && b != q)
            return b;
    }
    return checked  ? const_cast<QAbstractButton *>(q) : 0;
}

void QAbstractButtonPrivate::notifyChecked()
{
#ifndef QT_NO_BUTTONGROUP
    Q_Q(QAbstractButton);
    if (group) {
        QAbstractButton *previous = group->d_func()->checkedButton;
        group->d_func()->checkedButton = q;
        if (group->d_func()->exclusive && previous && previous != q)
            previous->nextCheckState();
    } else
#endif
    if (autoExclusive) {
        if (QAbstractButton *b = queryCheckedButton())
            b->setChecked(false);
    }
}

void QAbstractButtonPrivate::moveFocus(int key)
{
    QList<QAbstractButton *> buttonList = queryButtonList();;
#ifndef QT_NO_BUTTONGROUP
    bool exclusive = group ? group->d_func()->exclusive : autoExclusive;
#else
    bool exclusive = autoExclusive;
#endif
    QWidget *f = qApp->focusWidget();
    QAbstractButton *fb = ::qobject_cast<QAbstractButton *>(f);
    if (!fb || !buttonList.contains(fb))
        return;

    QAbstractButton *candidate = 0;
    int bestScore = -1;
    QRect fGeometry = f->geometry();

    QPoint goal(f->mapToGlobal(fGeometry.center()));

    for (int i = 0; i < buttonList.count(); ++i) {
        QAbstractButton *button = buttonList.at(i);
        if (button != f && button->isEnabled()) {
            QRect buttonGeometry = button->geometry();
            QPoint p(button->mapToGlobal(buttonGeometry.center()));
            int score = (p.y() - goal.y())*(p.y() - goal.y()) +
                        (p.x() - goal.x())*(p.x() - goal.x());
            bool betterScore = score < bestScore || !candidate;
            switch(key) {
            case Qt::Key_Up:
                if (p.y() < goal.y() && betterScore) {
                    if (qAbs(p.x() - goal.x()) < qAbs(p.y() - goal.y())) {
                        candidate = button;
                        bestScore = score;
                    } else if (buttonGeometry.x() == fGeometry.x()) {
                        candidate = button;
                        bestScore = score/2;
                    }
                }
                break;
            case Qt::Key_Down:
                if (p.y() > goal.y() && betterScore) {
                    if (qAbs(p.x() - goal.x()) < qAbs(p.y() - goal.y())) {
                        candidate = button;
                        bestScore = score;
                    } else if (buttonGeometry.x() == fGeometry.x()) {
                        candidate = button;
                        bestScore = score/2;
                    }
                }
                break;
            case Qt::Key_Left:
                if (p.x() < goal.x() && betterScore) {
                    if (qAbs(p.y() - goal.y()) < qAbs(p.x() - goal.x())) {
                        candidate = button;
                        bestScore = score;
                    } else if (buttonGeometry.y() == fGeometry.y()) {
                        candidate = button;
                        bestScore = score/2;
                    }
                }
                break;
            case Qt::Key_Right:
                if (p.x() > goal.x() && betterScore) {
                    if (qAbs(p.y() - goal.y()) < qAbs(p.x() - goal.x())) {
                        candidate = button;
                        bestScore = score;
                    } else if (buttonGeometry.y() == fGeometry.y()) {
                        candidate = button;
                        bestScore = score/2;
                    }
                }
                break;
            }
        }
    }

    if (exclusive
#ifdef QT_KEYPAD_NAVIGATION
        && !QApplication::keypadNavigationEnabled()
#endif
        && candidate
        && fb->d_func()->checked
        && candidate->d_func()->checkable)
        candidate->click();

    if (candidate) {
        if (key == Qt::Key_Up || key == Qt::Key_Left)
            candidate->setFocus(Qt::BacktabFocusReason);
        else
            candidate->setFocus(Qt::TabFocusReason);
    }
}

void QAbstractButtonPrivate::fixFocusPolicy()
{
    Q_Q(QAbstractButton);

    QList<QAbstractButton *> buttonList = queryButtonList();
    for (int i = 0; i < buttonList.count(); ++i) {
        QAbstractButton *b = buttonList.at(i);
        if (!b->isCheckable())
            continue;
        b->setFocusPolicy((Qt::FocusPolicy) ((b == q || !q->isCheckable())
                                         ? (b->focusPolicy() | Qt::TabFocus)
                                         :  (b->focusPolicy() & ~Qt::TabFocus)));
    }
}

void QAbstractButtonPrivate::init()
{
    Q_Q(QAbstractButton);

    q->setFocusPolicy(Qt::FocusPolicy(q->style()->styleHint(QStyle::SH_Button_FocusPolicy)));
    q->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
    q->setForegroundRole(QPalette::ButtonText);
    q->setBackgroundRole(QPalette::Button);
}

void QAbstractButtonPrivate::refresh()
{
    Q_Q(QAbstractButton);

    if (blockRefresh)
        return;
    q->update();
#ifndef QT_NO_ACCESSIBILITY
    QAccessible::updateAccessibility(q, 0, QAccessible::StateChanged);
#endif
}

void QAbstractButtonPrivate::click()
{
    Q_Q(QAbstractButton);

    down = false;
    blockRefresh = true;
    bool changeState = true;
    if (checked && queryCheckedButton() == q) {
        // the checked button of an exclusive or autoexclusive group cannot be unchecked
#ifndef QT_NO_BUTTONGROUP
        if (group ? group->d_func()->exclusive : autoExclusive)
#else
        if (autoExclusive)
#endif
            changeState = false;
    }

    QPointer<QAbstractButton> guard(q);
    if (changeState) {
        q->nextCheckState();
        if (!guard)
            return;
    }
    blockRefresh = false;
    refresh();
    q->repaint(); //flush paint event before invoking potentially expensive operation
    QApplication::flush();
    emitReleased();
    if (guard)
        emitClicked();
}

void QAbstractButtonPrivate::emitClicked()
{
    Q_Q(QAbstractButton);
    QPointer<QAbstractButton> guard(q);
    emit q->clicked(checked);
#ifndef QT_NO_BUTTONGROUP
    if (guard && group) {
        emit group->buttonClicked(group->id(q));
        emit group->buttonClicked(q);
    }
#endif
}

void QAbstractButtonPrivate::emitPressed()
{
    Q_Q(QAbstractButton);
    QPointer<QAbstractButton> guard(q);
    emit q->pressed();
#ifndef QT_NO_BUTTONGROUP
    if (guard && group) {
        emit group->buttonPressed(group->id(q));
        emit group->buttonPressed(q);
    }
#endif
}

void QAbstractButtonPrivate::emitReleased()
{
    Q_Q(QAbstractButton);
    QPointer<QAbstractButton> guard(q);
    emit q->released();
#ifndef QT_NO_BUTTONGROUP
    if (guard && group) {
        emit group->buttonReleased(group->id(q));
        emit group->buttonReleased(q);
    }
#endif
}

QAbstractButton::QAbstractButton(QWidget *parent)
    :QWidget(*new QAbstractButtonPrivate, parent, 0)
{
    Q_D(QAbstractButton);
    d->init();
}

 QAbstractButton::~QAbstractButton()
{
#ifndef QT_NO_BUTTONGROUP
    Q_D(QAbstractButton);
    if (d->group)
        d->group->removeButton(this);
#endif
}


QAbstractButton::QAbstractButton(QAbstractButtonPrivate &dd, QWidget *parent)
    : QWidget(dd, parent, 0)
{
    Q_D(QAbstractButton);
    d->init();
}

void QAbstractButton::setText(const QString &text)
{
    Q_D(QAbstractButton);
    if (d->text == text)
        return;
    d->text = text;
#ifndef QT_NO_SHORTCUT
    QKeySequence newMnemonic = QKeySequence::mnemonic(text);
    if (!newMnemonic.isEmpty())
        setShortcut(newMnemonic);
#endif
    update();
    updateGeometry();
#ifndef QT_NO_ACCESSIBILITY
    QAccessible::updateAccessibility(this, 0, QAccessible::NameChanged);
#endif
}

QString QAbstractButton::text() const
{
    Q_D(const QAbstractButton);
    return d->text;
}


void QAbstractButton::setIcon(const QIcon &icon)
{
    Q_D(QAbstractButton);
    d->icon = icon;
    update();
    updateGeometry();
}

QIcon QAbstractButton::icon() const
{
    Q_D(const QAbstractButton);
    return d->icon;
}

#ifndef QT_NO_SHORTCUT

void QAbstractButton::setShortcut(const QKeySequence &key)
{
    Q_D(QAbstractButton);
    if (d->shortcutId != 0)
        releaseShortcut(d->shortcutId);
    d->shortcut = key;
    d->shortcutId = grabShortcut(key);
}

QKeySequence QAbstractButton::shortcut() const
{
    Q_D(const QAbstractButton);
    return d->shortcut;
}
#endif // QT_NO_SHORTCUT

void QAbstractButton::setCheckable(bool checkable)
{
    Q_D(QAbstractButton);
    if (d->checkable == checkable)
        return;

    d->checkable = checkable;
    d->checked = false;
}

bool QAbstractButton::isCheckable() const
{
    Q_D(const QAbstractButton);
    return d->checkable;
}

void QAbstractButton::setChecked(bool checked)
{
    Q_D(QAbstractButton);
    if (!d->checkable || d->checked == checked) {
        if (!d->blockRefresh)
            checkStateSet();
        return;
    }

    if (!checked && d->queryCheckedButton() == this) {
        // the checked button of an exclusive or autoexclusive group cannot be  unchecked
#ifndef QT_NO_BUTTONGROUP
        if (d->group ? d->group->d_func()->exclusive : d->autoExclusive)
            return;
        if (d->group)
            d->group->d_func()->detectCheckedButton();
#else
        if (d->autoExclusive)
            return;
#endif
    }

    QPointer<QAbstractButton> guard(this);

    d->checked = checked;
    if (!d->blockRefresh)
        checkStateSet();
    d->refresh();

    if (guard && checked)
        d->notifyChecked();
    if (guard)
        emit toggled(checked);
}

bool QAbstractButton::isChecked() const
{
    Q_D(const QAbstractButton);
    return d->checked;
}

void QAbstractButton::setDown(bool down)
{
    Q_D(QAbstractButton);
    if (d->down == down)
        return;
    d->down = down;
    d->refresh();
    if (d->autoRepeat && d->down)
        d->repeatTimer.start(d->autoRepeatDelay, this);
    else
        d->repeatTimer.stop();
}

bool QAbstractButton::isDown() const
{
    Q_D(const QAbstractButton);
    return d->down;
}

void QAbstractButton::setAutoRepeat(bool autoRepeat)
{
    Q_D(QAbstractButton);
    if (d->autoRepeat == autoRepeat)
        return;
    d->autoRepeat = autoRepeat;
    if (d->autoRepeat && d->down)
        d->repeatTimer.start(d->autoRepeatDelay, this);
    else
        d->repeatTimer.stop();
}

bool QAbstractButton::autoRepeat() const
{
    Q_D(const QAbstractButton);
    return d->autoRepeat;
}

void QAbstractButton::setAutoRepeatDelay(int autoRepeatDelay)
{
    Q_D(QAbstractButton);
    d->autoRepeatDelay = autoRepeatDelay;
}

int QAbstractButton::autoRepeatDelay() const
{
    Q_D(const QAbstractButton);
    return d->autoRepeatDelay;
}

void QAbstractButton::setAutoRepeatInterval(int autoRepeatInterval)
{
    Q_D(QAbstractButton);
    d->autoRepeatInterval = autoRepeatInterval;
}

int QAbstractButton::autoRepeatInterval() const
{
    Q_D(const QAbstractButton);
    return d->autoRepeatInterval;
}



void QAbstractButton::setAutoExclusive(bool autoExclusive)
{
    Q_D(QAbstractButton);
    d->autoExclusive = autoExclusive;
}

bool QAbstractButton::autoExclusive() const
{
    Q_D(const QAbstractButton);
    return d->autoExclusive;
}

#ifndef QT_NO_BUTTONGROUP

QButtonGroup *QAbstractButton::group() const
{
    Q_D(const QAbstractButton);
    return d->group;
}
#endif // QT_NO_BUTTONGROUP

void QAbstractButton::animateClick(int msec)
{
    if (!isEnabled())
        return;
    Q_D(QAbstractButton);
    if (d->checkable && focusPolicy() != Qt::NoFocus)
        setFocus();
    setDown(true);
    repaint(); //flush paint event before invoking potentially expensive operation
    QApplication::flush();
    d->emitPressed();
    d->animateTimer.start(msec, this);
}

void QAbstractButton::click()
{
    if (!isEnabled())
        return;
    Q_D(QAbstractButton);
    QPointer<QAbstractButton> guard(this);
    d->down = true;
    d->emitPressed();
    if (guard) {
        d->down = false;
        nextCheckState();
        if (guard)
            d->emitReleased();
        if (guard)
            d->emitClicked();
    }
}

void QAbstractButton::toggle()
{
    Q_D(QAbstractButton);
    setChecked(!d->checked);
}


void QAbstractButton::checkStateSet()
{
}

void QAbstractButton::nextCheckState()
{
    if (isCheckable())
        setChecked(!isChecked());
}

bool QAbstractButton::hitButton(const QPoint &pos) const
{
    return rect().contains(pos);
}

bool QAbstractButton::event(QEvent *e)
{
    // as opposed to other widgets, disabled buttons accept mouse
    // events. This avoids surprising click-through scenarios
    if (!isEnabled()) {
        switch(e->type()) {
        case QEvent::TabletPress:
        case QEvent::TabletRelease:
        case QEvent::TabletMove:
        case QEvent::MouseButtonPress:
        case QEvent::MouseButtonRelease:
        case QEvent::MouseButtonDblClick:
        case QEvent::MouseMove:
        case QEvent::HoverMove:
        case QEvent::HoverEnter:
        case QEvent::HoverLeave:
        case QEvent::ContextMenu:
#ifndef QT_NO_WHEELEVENT
        case QEvent::Wheel:
#endif
            return true;
        default:
            break;
        }
    }

#ifndef QT_NO_SHORTCUT
    if (e->type() == QEvent::Shortcut) {
        Q_D(QAbstractButton);
        QShortcutEvent *se = static_cast<QShortcutEvent *>(e);
        if (d->shortcutId != se->shortcutId())
            return false;
        if (focusPolicy() != Qt::NoFocus)
            setFocus();
        if (!se->isAmbiguous())
            animateClick();
        else
            window()->setAttribute(Qt::WA_KeyboardFocusChange);
        return true;
    }
#endif
    return QWidget::event(e);
}

void QAbstractButton::mousePressEvent(QMouseEvent *e)
{
    Q_D(QAbstractButton);
    if (e->button() != Qt::LeftButton) {
        e->ignore();
        return;
    }
    if (hitButton(e->pos())) {
        setDown(true);
        repaint(); //flush paint event before invoking potentially expensive operation
        QApplication::flush();
        d->emitPressed();
        e->accept();
    } else {
        e->ignore();
    }
}

void QAbstractButton::mouseReleaseEvent(QMouseEvent *e)
{
    Q_D(QAbstractButton);
    if (e->button() != Qt::LeftButton) {
        // clean up apperance if left button has been pressed
        if (d->down)
            setDown(false);
        e->ignore();
        return;
    }

    if (!d->down)
        return;

    if (hitButton(e->pos())) {
        d->click();
        e->accept();
    } else {
        setDown(false);
        e->ignore();
    }
}

void QAbstractButton::mouseMoveEvent(QMouseEvent *e)
{
    Q_D(QAbstractButton);
    if (!(e->buttons() & Qt::LeftButton)) {
        e->ignore();
        return;
    }

    if (hitButton(e->pos()) != d->down) {
        setDown(!d->down);
        repaint(); //flush paint event before invoking potentially expensive operation
        QApplication::flush();
        if (d->down)
            d->emitPressed();
        else
            d->emitReleased();
        e->accept();
    } else if (!hitButton(e->pos())) {
        e->ignore();
    }
}

void QAbstractButton::keyPressEvent(QKeyEvent *e)
{
    Q_D(QAbstractButton);
    bool next = true;
    switch (e->key()) {
    case Qt::Key_Enter:
    case Qt::Key_Return:
        e->ignore();
        break;
    case Qt::Key_Select:
    case Qt::Key_Space:
        if (!e->isAutoRepeat()) {
            setDown(true);
            repaint(); //flush paint event before invoking potentially expensive operation
            QApplication::flush();
            d->emitPressed();
        }
        break;
    case Qt::Key_Up:
    case Qt::Key_Left:
        next = false;
        // fall through
    case Qt::Key_Right:
    case Qt::Key_Down:
#ifndef QT_NO_BUTTONGROUP
        if (d->group || d->autoExclusive) {
#else
        if (d->autoExclusive) {
#endif
            d->moveFocus(e->key());
            if (hasFocus()) // nothing happend, propagate
                e->ignore();
        } else {
            focusNextPrevChild(next);
        }
        break;
    case Qt::Key_Escape:
        if (d->down) {
            setDown(false);
            repaint(); //flush paint event before invoking potentially expensive operation
            QApplication::flush();
            d->emitReleased();
            break;
        }
        // fall through
    default:
        e->ignore();
    }
}

void QAbstractButton::keyReleaseEvent(QKeyEvent *e)
{
    Q_D(QAbstractButton);
    switch (e->key()) {
    case Qt::Key_Select:
    case Qt::Key_Space:
        if (!e->isAutoRepeat() && d->down)
            d->click();
        break;
    default:
        e->ignore();
    }
}

void QAbstractButton::timerEvent(QTimerEvent *e)
{
    Q_D(QAbstractButton);
    if (e->timerId() == d->repeatTimer.timerId()) {
        d->repeatTimer.start(d->autoRepeatInterval, this);
        if (d->down) {
            QPointer<QAbstractButton> guard(this);
            d->emitReleased();
            if (guard)
                d->emitClicked();
            if (guard)
                d->emitPressed();
        }
    } else if (e->timerId() == d->animateTimer.timerId()) {
        d->animateTimer.stop();
        d->click();
    }
}

void QAbstractButton::focusInEvent(QFocusEvent *e)
{
    Q_D(QAbstractButton);
#ifdef QT_KEYPAD_NAVIGATION
    if (!QApplication::keypadNavigationEnabled())
#endif
    d->fixFocusPolicy();
    QWidget::focusInEvent(e);
}

void QAbstractButton::focusOutEvent(QFocusEvent *e)
{
    Q_D(QAbstractButton);
    if (e->reason() != Qt::PopupFocusReason)
        d->down = false;
    QWidget::focusOutEvent(e);
}

void QAbstractButton::changeEvent(QEvent *e)
{
//     Q_D(QAbstractButton);
    switch (e->type()) {
    case QEvent::EnabledChange:
        if (!isEnabled())
            setDown(false);
        break;
    default:
        break;
    }
    QWidget::changeEvent(e);
}

QSize QAbstractButton::iconSize() const
{
    Q_D(const QAbstractButton);
    if (d->iconSize.isValid())
        return d->iconSize;
    int e = style()->pixelMetric(QStyle::PM_ButtonIconSize);
    return QSize(e, e);
}

void QAbstractButton::setIconSize(const QSize &size)
{
    Q_D(QAbstractButton);
    if (d->iconSize == size)
        return;

    d->iconSize = size;
    updateGeometry();
    if (isVisible()) {
        update();
    }
}


#ifdef QT3_SUPPORT

QIcon *QAbstractButton::iconSet() const
{
    Q_D(const QAbstractButton);
    if (!d->icon.isNull())
        return const_cast<QIcon *>(&d->icon);
    return 0;
}

QAbstractButton::QAbstractButton(QWidget *parent, const char *name, Qt::WindowFlags f)
    : QWidget(*new QAbstractButtonPrivate, parent, f)
{
    Q_D(QAbstractButton);
    setObjectName(QString::fromAscii(name));
    d->init();
}

#endif

---