qquickgroupbox.cpp

Go to the documentation of this file.

// 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
// Qt-Security score:significant reason:default
 
#include "qquickgroupbox_p.h"
#include "qquickframe_p_p.h"
#include "qquickdeferredexecute_p_p.h"
 
#include <QtGui/qpa/qplatformtheme.h>
 
QT_BEGIN_NAMESPACE
 
/*!
    \qmltype GroupBox
    \inherits Frame
//!     \nativetype QQuickGroupBox
    \inqmlmodule QtQuick.Controls
    \since 5.7
    \ingroup qtquickcontrols-containers
    \brief Visual frame and title for a logical group of controls.
 
    GroupBox is used to layout a logical group of controls together, within
    a \l {title}{titled} visual frame. GroupBox does not provide a layout of its own, but
    requires you to position its contents, for instance by creating a \l RowLayout
    or a \l ColumnLayout.
 
    Items declared as children of a GroupBox are automatically parented to the
    GroupBox's \l {Control::}{contentItem}. Items created dynamically need to be
    explicitly parented to the contentItem.
 
    If only a single item is used within a GroupBox, it will resize to fit the
    implicit size of its contained item. This makes it particularly suitable
    for use together with layouts.
 
    \image qtquickcontrols-groupbox.png
 
    \snippet qtquickcontrols-groupbox.qml 1
 
    \section2 Checkable GroupBox
 
    Even though GroupBox has no built-in check box, it is straightforward
    to create a checkable GroupBox by pairing it with a CheckBox.
 
    \image qtquickcontrols-groupbox-checkable.png
 
    It is a common pattern to enable or disable the groupbox's children when
    its checkbox is toggled on or off, but it is up to the application to decide
    on the behavior of the checkbox.
 
    \snippet qtquickcontrols-groupbox-checkable.qml 1
 
    \sa CheckBox, {Customizing GroupBox}, {Container Controls}
*/
 
class QQuickGroupBoxPrivate : public QQuickFramePrivate
{
    Q_DECLARE_PUBLIC(QQuickGroupBox)
 
public:
    void cancelLabel();
    void executeLabel(bool complete = false);
 
    void itemImplicitWidthChanged(QQuickItem *item) override;
    void itemImplicitHeightChanged(QQuickItem *item) override;
    void itemDestroyed(QQuickItem *item) override;
 
    QPalette defaultPalette() const override { return QQuickTheme::palette(QQuickTheme::GroupBox); }
 
    QString title;
    QQuickDeferredPointer<QQuickItem> label;
};
 
static inline QString labelName() { return QStringLiteral("label"); }
 
void QQuickGroupBoxPrivate::cancelLabel()
{
    Q_Q(QQuickGroupBox);
    quickCancelDeferred(q, labelName());
}
 
void QQuickGroupBoxPrivate::executeLabel(bool complete)
{
    Q_Q(QQuickGroupBox);
    if (label.wasExecuted())
        return;
 
    if (!label || complete)
        quickBeginDeferred(q, labelName(), label);
    if (complete)
        quickCompleteDeferred(q, labelName(), label);
}
 
void QQuickGroupBoxPrivate::itemImplicitWidthChanged(QQuickItem *item)
{
    Q_Q(QQuickGroupBox);
    QQuickFramePrivate::itemImplicitWidthChanged(item);
    if (item == label)
        emit q->implicitLabelWidthChanged();
}
 
void QQuickGroupBoxPrivate::itemImplicitHeightChanged(QQuickItem *item)
{
    Q_Q(QQuickGroupBox);
    QQuickFramePrivate::itemImplicitHeightChanged(item);
    if (item == label)
        emit q->implicitLabelHeightChanged();
}
 
void QQuickGroupBoxPrivate::itemDestroyed(QQuickItem *item)
{
    Q_Q(QQuickGroupBox);
    QQuickFramePrivate::itemDestroyed(item);
    if (item == label) {
        label = nullptr;
        emit q->labelChanged();
    }
}
 
QQuickGroupBox::QQuickGroupBox(QQuickItem *parent)
    : QQuickFrame(*(new QQuickGroupBoxPrivate), parent)
{
}
 
QQuickGroupBox::~QQuickGroupBox()
{
    Q_D(QQuickGroupBox);
    d->removeImplicitSizeListener(d->label);
}
 
/*!
    \qmlproperty string QtQuick.Controls::GroupBox::title
 
    This property holds the title.
 
    The title is typically displayed above the groupbox to
    summarize its contents.
*/
QString QQuickGroupBox::title() const
{
    Q_D(const QQuickGroupBox);
    return d->title;
}
 
void QQuickGroupBox::setTitle(const QString &title)
{
    Q_D(QQuickGroupBox);
    if (d->title == title)
        return;
 
    d->title = title;
    maybeSetAccessibleName(title);
    emit titleChanged();
}
 
/*!
    \qmlproperty Item QtQuick.Controls::GroupBox::label
 
    This property holds the label item that visualizes \l title.
 
    \sa {Customizing GroupBox}
*/
QQuickItem *QQuickGroupBox::label() const
{
    QQuickGroupBoxPrivate *d = const_cast<QQuickGroupBoxPrivate *>(d_func());
    if (!d->label)
        d->executeLabel();
    return d->label;
}
 
void QQuickGroupBox::setLabel(QQuickItem *label)
{
    Q_D(QQuickGroupBox);
    if (d->label == label)
        return;
 
    QQuickControlPrivate::warnIfCustomizationNotSupported(this, label, QStringLiteral("label"));
 
    if (!d->label.isExecuting())
        d->cancelLabel();
 
    const qreal oldImplicitLabelWidth = implicitLabelWidth();
    const qreal oldImplicitLabelHeight = implicitLabelHeight();
 
    d->removeImplicitSizeListener(d->label);
    QQuickControlPrivate::hideOldItem(d->label);
    d->label = label;
 
    if (label) {
        if (!label->parentItem())
            label->setParentItem(this);
        d->addImplicitSizeListener(label);
    }
 
    if (!qFuzzyCompare(oldImplicitLabelWidth, implicitLabelWidth()))
        emit implicitLabelWidthChanged();
    if (!qFuzzyCompare(oldImplicitLabelHeight, implicitLabelHeight()))
        emit implicitLabelHeightChanged();
    if (!d->label.isExecuting())
        emit labelChanged();
}
 
/*!
    \since QtQuick.Controls 2.5 (Qt 5.12)
    \qmlproperty real QtQuick.Controls::GroupBox::implicitLabelWidth
    \readonly
 
    This property holds the implicit label width.
 
    The value is equal to \c {label ? label.implicitWidth : 0}.
 
    \sa implicitLabelHeight
*/
qreal QQuickGroupBox::implicitLabelWidth() const
{
    Q_D(const QQuickGroupBox);
    if (!d->label)
        return 0;
    return d->label->implicitWidth();
}
 
/*!
    \since QtQuick.Controls 2.5 (Qt 5.12)
    \qmlproperty real QtQuick.Controls::GroupBox::implicitLabelHeight
    \readonly
 
    This property holds the implicit label height.
 
    The value is equal to \c {label ? label.implicitHeight : 0}.
 
    \sa implicitLabelWidth
*/
qreal QQuickGroupBox::implicitLabelHeight() const
{
    Q_D(const QQuickGroupBox);
    if (!d->label)
        return 0;
    return d->label->implicitHeight();
}
 
void QQuickGroupBox::componentComplete()
{
    Q_D(QQuickGroupBox);
    d->executeLabel(true);
    QQuickFrame::componentComplete();
}
 
QFont QQuickGroupBox::defaultFont() const
{
    return QQuickTheme::font(QQuickTheme::GroupBox);
}
 
#if QT_CONFIG(accessibility)
QAccessible::Role QQuickGroupBox::accessibleRole() const
{
    return QAccessible::Grouping;
}
 
void QQuickGroupBox::accessibilityActiveChanged(bool active)
{
    Q_D(QQuickGroupBox);
    QQuickFrame::accessibilityActiveChanged(active);
 
    if (active)
        maybeSetAccessibleName(d->title);
}
#endif
 
QT_END_NAMESPACE
 
#include "moc_qquickgroupbox_p.cpp"