qquickpage.cpp

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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qquickpage_p.h"
#include "qquickpage_p_p.h"
#include "qquicktabbar_p.h"
#include "qquicktoolbar_p.h"
#include "qquickdialogbuttonbox_p.h"
 
QT_BEGIN_NAMESPACE
 
 
static const QQuickItemPrivate::ChangeTypes LayoutChanges = QQuickItemPrivate::Geometry | QQuickItemPrivate::Visibility | QQuickItemPrivate::Destroyed
                                                          | QQuickItemPrivate::ImplicitWidth | QQuickItemPrivate::ImplicitHeight;
 
namespace {
    enum Position {
        Header,
        Footer
    };
 
    Q_STATIC_ASSERT(int(Header) == int(QQuickTabBar::Header));
    Q_STATIC_ASSERT(int(Footer) == int(QQuickTabBar::Footer));
 
    Q_STATIC_ASSERT(int(Header) == int(QQuickToolBar::Header));
    Q_STATIC_ASSERT(int(Footer) == int(QQuickToolBar::Footer));
 
    Q_STATIC_ASSERT(int(Header) == int(QQuickDialogButtonBox::Header));
    Q_STATIC_ASSERT(int(Footer) == int(QQuickDialogButtonBox::Footer));
 
    static void setPos(QQuickItem *item, Position position)
    {
        if (QQuickToolBar *toolBar = qobject_cast<QQuickToolBar *>(item))
            toolBar->setPosition(static_cast<QQuickToolBar::Position>(position));
        else if (QQuickTabBar *tabBar = qobject_cast<QQuickTabBar *>(item))
            tabBar->setPosition(static_cast<QQuickTabBar::Position>(position));
        else if (QQuickDialogButtonBox *buttonBox = qobject_cast<QQuickDialogButtonBox *>(item))
            buttonBox->setPosition(static_cast<QQuickDialogButtonBox::Position>(position));
    }
}
 
void QQuickPagePrivate::relayout()
{
    Q_Q(QQuickPage);
    const qreal hh = header && header->isVisible() ? header->height() : 0;
    const qreal fh = footer && footer->isVisible() ? footer->height() : 0;
    const qreal hsp = hh > 0 ? spacing : 0;
    const qreal fsp = fh > 0 ? spacing : 0;
 
    if (contentItem) {
        contentItem->setY(q->topPadding() + hh + hsp);
        contentItem->setX(q->leftPadding());
        contentItem->setWidth(q->availableWidth());
        contentItem->setHeight(q->availableHeight() - hh - fh - hsp - fsp);
    }
 
    if (header)
        header->setWidth(q->width());
 
    if (footer) {
        footer->setY(q->height() - footer->height());
        footer->setWidth(q->width());
    }
}
 
void QQuickPagePrivate::resizeContent()
{
    relayout();
}
 
void QQuickPagePrivate::itemVisibilityChanged(QQuickItem *item)
{
    Q_Q(QQuickPage);
    QQuickPanePrivate::itemVisibilityChanged(item);
    if (item == header) {
        QBoolBlocker signalGuard(emittingImplicitSizeChangedSignals);
        emit q->implicitHeaderWidthChanged();
        emit q->implicitHeaderHeightChanged();
        relayout();
    } else if (item == footer) {
        QBoolBlocker signalGuard(emittingImplicitSizeChangedSignals);
        emit q->implicitFooterWidthChanged();
        emit q->implicitFooterHeightChanged();
        relayout();
    }
}
 
void QQuickPagePrivate::itemImplicitWidthChanged(QQuickItem *item)
{
    Q_Q(QQuickPage);
    QQuickPanePrivate::itemImplicitWidthChanged(item);
 
    // Avoid binding loops by skipping signal emission if we're already doing it.
    if (emittingImplicitSizeChangedSignals)
        return;
 
    if (item == header)
        emit q->implicitHeaderWidthChanged();
    else if (item == footer)
        emit q->implicitFooterWidthChanged();
}
 
void QQuickPagePrivate::itemImplicitHeightChanged(QQuickItem *item)
{
    Q_Q(QQuickPage);
    QQuickPanePrivate::itemImplicitHeightChanged(item);
 
    // Avoid binding loops by skipping signal emission if we're already doing it.
    if (emittingImplicitSizeChangedSignals)
        return;
 
    if (item == header)
        emit q->implicitHeaderHeightChanged();
    else if (item == footer)
        emit q->implicitFooterHeightChanged();
}
 
void QQuickPagePrivate::itemGeometryChanged(QQuickItem *item, QQuickGeometryChange change, const QRectF & diff)
{
    QQuickPanePrivate::itemGeometryChanged(item, change, diff);
    if (item == header || item == footer)
        relayout();
}
 
void QQuickPagePrivate::itemDestroyed(QQuickItem *item)
{
    Q_Q(QQuickPage);
    QQuickPanePrivate::itemDestroyed(item);
    if (item == header) {
        header = nullptr;
        relayout();
        emit q->implicitHeaderWidthChanged();
        emit q->implicitHeaderHeightChanged();
        emit q->headerChanged();
    } else if (item == footer) {
        footer = nullptr;
        relayout();
        emit q->implicitFooterWidthChanged();
        emit q->implicitFooterHeightChanged();
        emit q->footerChanged();
    }
}
 
QQuickPage::QQuickPage(QQuickItem *parent)
    : QQuickPane(*(new QQuickPagePrivate), parent)
{
}
 
QQuickPage::QQuickPage(QQuickPagePrivate &dd, QQuickItem *parent)
    : QQuickPane(dd, parent)
{
}
 
QQuickPage::~QQuickPage()
{
    Q_D(QQuickPage);
    if (d->header)
        QQuickItemPrivate::get(d->header)->removeItemChangeListener(d, LayoutChanges);
    if (d->footer)
        QQuickItemPrivate::get(d->footer)->removeItemChangeListener(d, LayoutChanges);
}
 
QString QQuickPage::title() const
{
    return d_func()->title;
}
 
void QQuickPage::setTitle(const QString &title)
{
    Q_D(QQuickPage);
    if (d->title == title)
        return;
 
    d->title = title;
    maybeSetAccessibleName(title);
    emit titleChanged();
}
 
QQuickItem *QQuickPage::header() const
{
    Q_D(const QQuickPage);
    return d->header;
}
 
void QQuickPage::setHeader(QQuickItem *header)
{
    Q_D(QQuickPage);
    if (d->header == header)
        return;
 
    if (d->header) {
        QQuickItemPrivate::get(d->header)->removeItemChangeListener(d, LayoutChanges);
        d->header->setParentItem(nullptr);
    }
    d->header = header;
    if (header) {
        header->setParentItem(this);
        QQuickItemPrivate::get(header)->addItemChangeListener(d, LayoutChanges);
        if (qFuzzyIsNull(header->z()))
            header->setZ(1);
        setPos(header, Header);
    }
    if (isComponentComplete())
        d->relayout();
    emit headerChanged();
}
 
QQuickItem *QQuickPage::footer() const
{
    Q_D(const QQuickPage);
    return d->footer;
}
 
void QQuickPage::setFooter(QQuickItem *footer)
{
    Q_D(QQuickPage);
    if (d->footer == footer)
        return;
 
    if (d->footer) {
        QQuickItemPrivate::get(d->footer)->removeItemChangeListener(d, LayoutChanges);
        d->footer->setParentItem(nullptr);
    }
    d->footer = footer;
    if (footer) {
        footer->setParentItem(this);
        QQuickItemPrivate::get(footer)->addItemChangeListener(d, LayoutChanges);
        if (qFuzzyIsNull(footer->z()))
            footer->setZ(1);
        setPos(footer, Footer);
    }
    if (isComponentComplete())
        d->relayout();
    emit footerChanged();
}
 
qreal QQuickPage::implicitHeaderWidth() const
{
    Q_D(const QQuickPage);
    if (!d->header || !d->header->isVisible())
        return 0;
    return d->header->implicitWidth();
}
 
qreal QQuickPage::implicitHeaderHeight() const
{
    Q_D(const QQuickPage);
    if (!d->header || !d->header->isVisible())
        return 0;
    return d->header->implicitHeight();
}
 
qreal QQuickPage::implicitFooterWidth() const
{
    Q_D(const QQuickPage);
    if (!d->footer || !d->footer->isVisible())
        return 0;
    return d->footer->implicitWidth();
}
 
qreal QQuickPage::implicitFooterHeight() const
{
    Q_D(const QQuickPage);
    if (!d->footer || !d->footer->isVisible())
        return 0;
    return d->footer->implicitHeight();
}
 
void QQuickPage::componentComplete()
{
    Q_D(QQuickPage);
    QQuickPane::componentComplete();
    d->relayout();
}
 
void QQuickPage::spacingChange(qreal newSpacing, qreal oldSpacing)
{
    Q_D(QQuickPage);
    QQuickPane::spacingChange(newSpacing, oldSpacing);
    d->relayout();
}
 
#if QT_CONFIG(accessibility)
QAccessible::Role QQuickPage::accessibleRole() const
{
    return QAccessible::PageTab;
}
 
void QQuickPage::accessibilityActiveChanged(bool active)
{
    Q_D(QQuickPage);
    QQuickPane::accessibilityActiveChanged(active);
 
    if (active)
        maybeSetAccessibleName(d->title);
}
#endif
 
QT_END_NAMESPACE
 
#include "moc_qquickpage_p.cpp"