1 files changed, 122 insertions, 0 deletions
diff --git a/src/quickcontrols2/qquickitemgroup.cpp b/src/quickcontrols2/qquickitemgroup.cpp
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+++ b/src/quickcontrols2/qquickitemgroup.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
+{
+    QQuickImplicitSizeItem::geometryChanged(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