| /**************************************************************************** |
| ** |
| ** 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 |
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| ** |
| ** 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. |
| ** |
| ** $QT_END_LICENSE$ |
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| ****************************************************************************/ |
| |
| #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 |