qt-everywhere-src-5.14.1/qtquickcontrols/src/controls/qquickstack.cpp

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#include "qquickstack_p.h"

QT_BEGIN_NAMESPACE

/*!
    \qmltype Stack
    \instantiates QQuickStack1
    \inqmlmodule QtQuick.Controls
    \ingroup controls
    \brief Provides attached properties for items pushed onto a StackView.

    The Stack type provides attached properties for items pushed onto a \l StackView.
    It gives specific information about the item, such as its \l status and
    \l index in the stack \l view the item is in.

    \sa StackView
*/

QQuickStack1::QQuickStack1(QObject *object)
    : QObject(object),
      m_index(-1),
      m_status(Inactive),
      m_view(0)
{
}

QQuickStack1 *QQuickStack1::qmlAttachedProperties(QObject *object)
{
    return new QQuickStack1(object);
}

/*!
    \readonly
    \qmlattachedproperty int Stack::index

    This property holds the index of the item inside \l{view}{StackView},
    so that \l{StackView::get()}{StackView.get(index)} will return the item itself.
    If \l{Stack::view}{view} is \c null, \a index will be \c -1.
*/
int QQuickStack1::index() const
{
    return m_index;
}

void QQuickStack1::setIndex(int index)
{
    if (m_index != index) {
        m_index = index;
        emit indexChanged();
    }
}

/*!
    \readonly
    \qmlattachedproperty enumeration Stack::status

    This property holds the status of the item. It can have one of the following values:
    \list
    \li \c Stack.Inactive: the item is not visible
    \li \c Stack.Activating: the item is transitioning into becoming an active item on the stack
    \li \c Stack.Active: the item is on top of the stack
    \li \c Stack.Deactivating: the item is transitioning into becoming inactive
    \endlist
*/
QQuickStack1::Status QQuickStack1::status() const
{
    return m_status;
}

void QQuickStack1::setStatus(Status status)
{
    if (m_status != status) {
        m_status = status;
        emit statusChanged();
    }
}

/*!
    \readonly
    \qmlattachedproperty StackView Stack::view

    This property holds the StackView the item is in. If the item is not inside
    a StackView, \a view will be \c null.
*/
QQuickItem *QQuickStack1::view() const
{
    return m_view;
}

void QQuickStack1::setView(QQuickItem *view)
{
    if (m_view != view) {
        m_view = view;
        emit viewChanged();
    }
}

QT_END_NAMESPACE