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Diffstat (limited to 'src/quickcontrols2impl/qquickitemgroup.cpp')
-rw-r--r-- | src/quickcontrols2impl/qquickitemgroup.cpp | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/quickcontrols2impl/qquickitemgroup.cpp b/src/quickcontrols2impl/qquickitemgroup.cpp new file mode 100644 index 00000000..c4307001 --- /dev/null +++ b/src/quickcontrols2impl/qquickitemgroup.cpp @@ -0,0 +1,122 @@ +/**************************************************************************** +** +** 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::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 |