/****************************************************************************
**
** 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
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** If you are unsure which license is appropriate for your use, please
** review the following information:
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****************************************************************************/

#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


/*!
    \class QAbstractButton

    \brief The QAbstractButton class is the abstract base class of
    button widgets, providing functionality common to buttons.

    \ingroup abstractwidgets

    This class implements an \e abstract button.
    Subclasses of this class handle user actions, and specify how the button
    is drawn.

    QAbstractButton provides support for both push buttons and checkable
    (toggle) buttons. Checkable buttons are implemented in the QRadioButton
    and QCheckBox classes. Push buttons are implemented in the
    QPushButton and QToolButton classes; these also provide toggle
    behavior if required.

    Any button can display a label containing text and an icon. setText()
    sets the text; setIcon() sets the icon. If a button is disabled, its label
    is changed to give the button a "disabled" appearance.

    If the button is a text button with a string containing an ampersand (\&),
    QAbstractButton creates an automatic shortcut key, called a mnemonic, that may
    change based on the button translation. The following code creates
    a push button labelled "Ro\underline{c}k & Roll" (where the c is underlined):

    \code
        QPushButton *button = new QPushButton(tr("Ro&ck && Roll"), this);
    \endcode

    In this example, the shortcut \key Alt+C is assigned to the button, so that when
    the user presses \key Alt+C the button will call animateClick().

    You can also set a custom shortcut key using the setShortcut()
    function. This is useful mostly for buttons that do not have any
    text, because they have no automatic shortcut.

    \code
        button->setIcon(QIcon(":/images/print.png"));
        button->setShortcut(tr("Alt+F7"));
    \endcode

    All of the buttons provided by Qt (QPushButton, QToolButton,
    QCheckBox, and QRadioButton) can display both \l text and \l{icon}{icons}.

    A button can be made the default button in a dialog are provided by
    QPushButton::setDefault() and QPushButton::setAutoDefault().

    QAbstractButton provides most of the states used for buttons:

    \list

    \o isDown() indicates whether the button is \e pressed down.

    \o isChecked() indicates whether the button is \e checked.  Only
    checkable buttons can be checked and unchecked (see below).

    \o isEnabled() indicates whether the button can be pressed by the
    user.

    \o setAutoRepeat() sets whether the button will auto-repeat if the
    user holds it down. \l autoRepeatDelay and \l autoRepeatInterval
    define how auto-repetition is done.

    \o setCheckable() sets whether the button is a toggle button or not.

    \endlist

    The difference between isDown() and isChecked() is as follows.
    When the user clicks a toggle button to check it, the button is first
    \e pressed then released into the \e checked state. When the user
    clicks it again (to uncheck it), the button moves first to the
    \e pressed state, then to the \e unchecked state (isChecked() and
    isDown() are both false).

    QAbstractButton provides five signals:

    \list 1

    \o pressed() is emitted when the left mouse button is pressed while
    the mouse cursor is inside the button.

    \o released() is emitted when the left mouse button is released.

    \o clicked() is emitted when the button is first pressed and then
    released, when the shortcut key is typed, or when click() or
    animateClick() is called.

    \o toggled(bool) is emitted when the state of a toggle button
    changes.

    \endlist

    To subclass QAbstractButton, you must reimplement at least
    paintEvent() to draw the button's outline and its text or pixmap. It
    is generally advisable to reimplement sizeHint() as well, and
    sometimes hitButton() (to determine whether a button press is within
    the button). For buttons with more than two states (like tri-state
    buttons), you will also have to reimplement checkStateSet() and
    nextCheckState().

    \sa QButtonGroup
*/

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;
}

/*!
    Adds the given \a button to the end of the group's internal list of buttons.

    \sa removeButton()
*/
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
}

/*!
    Constructs an abstract button with a \a parent.
*/
QAbstractButton::QAbstractButton(QWidget *parent)
    :QWidget(*new QAbstractButtonPrivate, parent, 0)
{
    Q_D(QAbstractButton);
    d->init();
}

/*!
    Destroys the button.
 */
 QAbstractButton::~QAbstractButton()
{
#ifndef QT_NO_BUTTONGROUP
    Q_D(QAbstractButton);
    if (d->group)
        d->group->removeButton(this);
#endif
}


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

/*!
\property QAbstractButton::text
\brief the text shown on the button

This property will return a an empty string if the button has no text.
If the text contains an ampersand character (\&), a mnemonic is
automatically created for it. The character that follows the '\&' will be
used as the shortcut key. Any previous mnemonic will be overwritten,
or cleared if no mnemonic is defined by the text.

There is no default text.
*/

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;
}


/*!
  \property QAbstractButton::icon
  \brief the icon shown on the button

  The icon's default size is defined by the GUI style, but can be
  adjusted by setting the \l iconSize property.
*/
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
/*!
\property QAbstractButton::shortcut
\brief the mnemonic associated with the button
*/

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

/*!
\property QAbstractButton::checkable
\brief whether the button is checkable

By default, the button is not checkable.

\sa checked
*/
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;
}

/*!
\property QAbstractButton::checked
\brief whether the button is checked

Only checkable buttons can be checked. By default, the button is unchecked.

\sa 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;
}

/*!
  \property QAbstractButton::down
  \brief whether the button is pressed down

  If this property is true, the button is pressed down. The signals
  pressed() and clicked() are not emitted if you set this property
  to true. The default is false.
*/

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;
}

/*!
\property QAbstractButton::autoRepeat
\brief whether autoRepeat is enabled

If autoRepeat is enabled then the clicked() signal is emitted at
regular intervals when the button is down. This property has no effect
on toggle buttons. autoRepeat is off by default. The initial delay and
the repetition interval are defined in milliseconds by \l
autoRepeatDelay and \l autoRepeatInterval.
*/

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;
}

/*!
    \property QAbstractButton::autoRepeatDelay
    \brief the initial delay of auto-repetition
    \since 4.2

    If \l autoRepeat is enabled, then autoRepeatDelay defines the initial
    delay in milliseconds before auto-repetition kicks in.

    \sa autoRepeat, autoRepeatInterval
*/

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

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

/*!
    \property QAbstractButton::autoRepeatInterval
    \brief the interval of auto-repetition
    \since 4.2

    If \l autoRepeat is enabled, then autoRepeatInterval defines the
    length of the auto-repetition interval in millisecons.

    \sa autoRepeat, autoRepeatDelay
*/

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

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



/*!
\property QAbstractButton::autoExclusive
\brief whether auto-exclusivity is enabled

If auto-exclusivity is enabled, checkable buttons that belong to the
same parent widget behave as if they were part of the same
exclusive button group. In an exclusive button group, only one button
can be checked at any time; checking another button automatically
unchecks the previously checked one.

The property has no effect on buttons that belong to a button
group.

autoExclusive is off by default, except for radio buttons.

\sa QRadioButton
*/
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
/*!
  Returns the group that this button belongs to.

  If the button is not a member of any QButtonGroup, this function
  returns 0.

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

/*!
Performs an animated click: the button is pressed and released
\a msec milliseconds later (the default is 100 ms).

All signals associated with a click are emitted as appropriate.

This function does nothing if the button is \link setEnabled()
disabled. \endlink

\sa click()
*/
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);
}

/*!
Performs a click.

All the usual signals associated with a click are emitted as
appropriate. If the button is checkable, the state of the button is
toggled.

This function does nothing if the button is \link setEnabled()
disabled. \endlink

\sa animateClick()
 */
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();
    }
}

/*! \fn void QAbstractButton::toggle()

    Toggles the state of a checkable button.

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


/*! This virtual handler is called when setChecked() was called,
unless it was called from within nextCheckState(). It allows
subclasses to reset their intermediate button states.

\sa nextCheckState()
 */
void QAbstractButton::checkStateSet()
{
}

/*! This virtual handler is called when a button is clicked. The
default implementation calls setChecked(!isChecked()) if the button
isCheckable().  It allows subclasses to implement intermediate button
states.

\sa checkStateSet()
*/
void QAbstractButton::nextCheckState()
{
    if (isCheckable())
        setChecked(!isChecked());
}

/*!
Returns true if \a pos is inside the clickable button rectangle;
otherwise returns false.

By default, the clickable area is the entire widget. Subclasses
may reimplement this function to provide support for clickable
areas of different shapes and sizes.
*/
bool QAbstractButton::hitButton(const QPoint &pos) const
{
    return rect().contains(pos);
}

/*! \reimp */
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);
}

/*! \reimp */
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();
    }
}

/*! \reimp */
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();
    }
}

/*! \reimp */
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();
    }
}

/*! \reimp */
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();
    }
}

/*! \reimp */
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();
    }
}

/*!\reimp
 */
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();
    }
}

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

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

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

/*!
    \fn void QAbstractButton::paintEvent(QPaintEvent *e)
    \reimp
*/

/*!
    \fn void QAbstractButton::pressed()

    This signal is emitted when the button is pressed down.

    \sa released(), clicked()
*/

/*!
    \fn void QAbstractButton::released()

    This signal is emitted when the button is released.

    \sa pressed(), clicked(), toggled()
*/

/*!
\fn void QAbstractButton::clicked(bool checked)

This signal is emitted when the button is activated (i.e. pressed down
then released while the mouse cursor is inside the button), when the
shortcut key is typed, or when click() or animateClick() is called.
Notably, this signal is \e not emitted if you call setDown(),
setChecked() or toggle().

If the button is checkable, \a checked is true if the button is
checked, or false if the button is unchecked.

\sa pressed(), released(), toggled()
*/

/*!
\fn void QAbstractButton::toggled(bool checked)

This signal is emitted whenever a checkable button changes its state.
\a checked is true if the button is checked, or false if the button is
unchecked.

This may be the result of a user action, click() slot activation,
or because setChecked() was called.

The states of buttons in exclusive button groups are updated before this
signal is emitted. This means that slots can act on either the "off"
signal or the "on" signal emitted by the buttons in the group whose
states have changed.

For example, a slot that reacts to signals emitted by newly checked
buttons but which ignores signals from buttons that have been unchecked
can be implemented using the following pattern:

\code
void MyWidget::reactToToggle(bool checked)
{
   if (checked) {
      // Examine the new button states.
      ...
   }
}
\endcode

Button groups can be created using the QButtonGroup class, and
updates to the button states monitored with the
\l{QButtonGroup::buttonClicked()} signal.

\sa checked, clicked()
*/

/*!
    \property QAbstractButton::iconSize
    \brief the icon size used for this button.

    The default size is defined by the GUI style.
*/

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

/*!
    Use QAbstractButton(QWidget *) instead.

    Call setObjectName() if you want to specify an object name, and
    setParent() if you want to set the window flags.
*/
QAbstractButton::QAbstractButton(QWidget *parent, const char *name, Qt::WindowFlags f)
    : QWidget(*new QAbstractButtonPrivate, parent, f)
{
    Q_D(QAbstractButton);
    setObjectName(QString::fromAscii(name));
    d->init();
}

/*! \fn bool QAbstractButton::isOn() const

    Use isChecked() instead.
*/

/*!
    \fn QPixmap *QAbstractButton::pixmap() const

    This compatibility function always returns 0.

    Use icon() instead.
*/

/*! \fn void QAbstractButton::setPixmap(const QPixmap &p)

    Use setIcon() instead.
*/

/*! \fn void QAbstractButton::setIconSet(const QIcon &icon)

    Use setIcon() instead.
*/

/*! \fn void QAbstractButton::setOn(bool b)

    Use setChecked() instead.
*/

/*! \fn bool QAbstractButton::isToggleButton() const

    Use isCheckable() instead.
*/

/*!
    \fn void QAbstractButton::setToggleButton(bool b)

    Use setCheckable() instead.
*/

/*! \fn void QAbstractButton::setAccel(const QKeySequence &key)

    Use setShortcut() instead.
*/

/*! \fn QKeySequence QAbstractButton::accel() const

    Use shortcut() instead.
*/

#endif