1 files changed, 91 insertions, 0 deletions
diff --git a/src/quickcontrolsimpl/qquickitemgroup.cpp b/src/quickcontrolsimpl/qquickitemgroup.cpp
new file mode 100644
index 0000000000..ea847d2da9
--- /dev/null
+++ b/src/quickcontrolsimpl/qquickitemgroup.cpp
@@ -0,0 +1,91 @@
+// 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 "qquickitemgroup_p.h"
+
+#include <QtQuick/private/qquickimplicitsizeitem_p_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QQuickItemGroup::QQuickItemGroup(QQuickItem *parent)
+    : QQuickImplicitSizeItem(*(new QQuickImplicitSizeItemPrivate), parent)
+{
+}
+
+QQuickItemGroup::~QQuickItemGroup()
+{
+    const auto children = childItems();
+    for (QQuickItem *child : children)
+        unwatch(child);
+}
+
+void QQuickItemGroup::watch(QQuickItem *item)
+{
+    QQuickItemPrivate::get(item)->addItemChangeListener(this, QQuickItemPrivate::ImplicitWidth | QQuickItemPrivate::ImplicitHeight);
+}
+
+void QQuickItemGroup::unwatch(QQuickItem *item)
+{
+    QQuickItemPrivate::get(item)->removeItemChangeListener(this, QQuickItemPrivate::ImplicitWidth | QQuickItemPrivate::ImplicitHeight);
+}
+
+QSizeF QQuickItemGroup::calculateImplicitSize() const
+{
+    qreal width = 0;
+    qreal height = 0;
+    const auto children = childItems();
+    for (QQuickItem *child : children) {
+        width = qMax(width, child->implicitWidth());
+        height = qMax(height, child->implicitHeight());
+    }
+    return QSizeF(width, height);
+}
+
+void QQuickItemGroup::updateImplicitSize()
+{
+    QSizeF size = calculateImplicitSize();
+    setImplicitSize(size.width(), size.height());
+}
+
+void QQuickItemGroup::itemChange(ItemChange change, const ItemChangeData &data)
+{
+    QQuickImplicitSizeItem::itemChange(change, data);
+    switch (change) {
+    case ItemChildAddedChange:
+        watch(data.item);
+        data.item->setSize(QSizeF(width(), height()));
+        updateImplicitSize();
+        break;
+    case ItemChildRemovedChange:
+        unwatch(data.item);
+        updateImplicitSize();
+        break;
+    default:
+        break;
+    }
+}
+
+void QQuickItemGroup::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
+{
+    QQuickImplicitSizeItem::geometryChange(newGeometry, oldGeometry);
+
+    if (newGeometry.size() != oldGeometry.size()) {
+        const auto children = childItems();
+        for (QQuickItem *child : children)
+            child->setSize(newGeometry.size());
+    }
+}
+
+void QQuickItemGroup::itemImplicitWidthChanged(QQuickItem *)
+{
+    setImplicitWidth(calculateImplicitSize().width());
+}
+
+void QQuickItemGroup::itemImplicitHeightChanged(QQuickItem *)
+{
+    setImplicitHeight(calculateImplicitSize().height());
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qquickitemgroup_p.cpp"