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

#include "qquickcheckbox_p.h"
#include "qquickabstractbutton_p_p.h"

#include <QtGui/qpa/qplatformtheme.h>

QT_BEGIN_NAMESPACE

/*!
    \qmltype CheckBox
    \inherits AbstractButton
    \instantiates QQuickCheckBox
    \inqmlmodule Qt.labs.controls
    \ingroup qtlabscontrols-buttons
    \brief A check box control.

    CheckBox presents an option button that can be toggled on (checked) or
    off (unchecked). Check boxes are typically used to select one or more
    options from a set of options.

    \table
    \row \li \image qtlabscontrols-checkbox-normal.png
         \li A check box in its normal state.
    \row \li \image qtlabscontrols-checkbox-checked.png
         \li A check box that is checked.
    \row \li \image qtlabscontrols-checkbox-focused.png
         \li A check box that has active focus.
    \row \li \image qtlabscontrols-checkbox-disabled.png
         \li A check box that is disabled.
    \endtable

    \code
    ColumnLayout {
        CheckBox {
            checked: true
            text: qsTr("First")
        }
        CheckBox {
            text: qsTr("Second")
        }
        CheckBox {
            checked: true
            text: qsTr("Third")
        }
    }
    \endcode

    \labs

    \sa {Customizing CheckBox}, {Button Controls}
*/

class QQuickCheckBoxPrivate : public QQuickAbstractButtonPrivate
{
    Q_DECLARE_PUBLIC(QQuickCheckBox)

public:
    QQuickCheckBoxPrivate()
        : tristate(false), checkState(Qt::Unchecked)
    {
    }

    bool tristate;
    Qt::CheckState checkState;
};

QQuickCheckBox::QQuickCheckBox(QQuickItem *parent) :
    QQuickAbstractButton(*(new QQuickCheckBoxPrivate), parent)
{
    setCheckable(true);
}

/*!
    \qmlproperty bool Qt.labs.controls::CheckBox::tristate

    This property holds whether the checkbox is a tri-state checkbox.

    The default is \c false, i.e., the checkbox has only two states.
*/
bool QQuickCheckBox::isTristate() const
{
    Q_D(const QQuickCheckBox);
    return d->tristate;
}

void QQuickCheckBox::setTristate(bool tristate)
{
    Q_D(QQuickCheckBox);
    if (d->tristate != tristate) {
        d->tristate = tristate;
        emit tristateChanged();
    }
}

/*!
    \qmlproperty enumeration Qt.labs.controls::CheckBox::checkState

    This property holds the check state of the checkbox.

    Available states:
    \value Qt.Unchecked The checkbox is unchecked.
    \value Qt.PartiallyChecked The checkbox is partially checked. This state is only used when \l tristate is enabled.
    \value Qt.Checked The checkbox is checked.

    \sa tristate, {AbstractButton::checked}{checked}
*/
Qt::CheckState QQuickCheckBox::checkState() const
{
    Q_D(const QQuickCheckBox);
    return d->checkState;
}

void QQuickCheckBox::setCheckState(Qt::CheckState state)
{
    Q_D(QQuickCheckBox);
    if (!d->tristate && state == Qt::PartiallyChecked)
        setTristate(true);
    if (d->checkState != state) {
        bool wasChecked = isChecked();
        d->checked = state != Qt::Unchecked;
        d->checkState = state;
        emit checkStateChanged();
        if (d->checked != wasChecked)
            emit checkedChanged();
    }
}

QFont QQuickCheckBox::defaultFont() const
{
    return QQuickControlPrivate::themeFont(QPlatformTheme::CheckBoxFont);
}

void QQuickCheckBox::checkStateSet()
{
    setCheckState(isChecked() ? Qt::Checked : Qt::Unchecked);
}

void QQuickCheckBox::nextCheckState()
{
    Q_D(QQuickCheckBox);
    if (d->tristate)
        setCheckState(static_cast<Qt::CheckState>((d->checkState + 1) % 3));
    else
        QQuickAbstractButton::nextCheckState();
}

#ifndef QT_NO_ACCESSIBILITY
QAccessible::Role QQuickCheckBox::accessibleRole() const
{
    return QAccessible::CheckBox;
}
#endif

QT_END_NAMESPACE