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Diffstat (limited to 'src/qtdesktop/qquicklinearlayout.cpp')
| -rw-r--r-- | src/qtdesktop/qquicklinearlayout.cpp | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/src/qtdesktop/qquicklinearlayout.cpp b/src/qtdesktop/qquicklinearlayout.cpp new file mode 100644 index 00000000..995551d1 --- /dev/null +++ b/src/qtdesktop/qquicklinearlayout.cpp @@ -0,0 +1,233 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qquicklinearlayout.h" +#include "qquicklayoutengine_p.h" +#include <QtCore/qnumeric.h> + +static const qreal q_declarativeLayoutDefaultSpacing = 4.0; + + +QQuickComponentsLinearLayout::QQuickComponentsLinearLayout(Orientation orientation, + QQuickItem *parent) + : QQuickComponentsLayout(parent), + m_spacing(q_declarativeLayoutDefaultSpacing), + m_orientation(orientation) +{ + +} + +qreal QQuickComponentsLinearLayout::spacing() const +{ + return m_spacing; +} + +void QQuickComponentsLinearLayout::setSpacing(qreal spacing) +{ + if (qIsNaN(spacing) || m_spacing == spacing) + return; + + m_spacing = spacing; + invalidate(); +} + +QQuickComponentsLinearLayout::Orientation QQuickComponentsLinearLayout::orientation() const +{ + return m_orientation; +} + +void QQuickComponentsLinearLayout::setOrientation(Orientation orientation) +{ + if (m_orientation == orientation) + return; + + m_orientation = orientation; + invalidate(); + + emit orientationChanged(); +} + +void QQuickComponentsLinearLayout::componentComplete() +{ + QQuickComponentsLayout::componentComplete(); + updateLayoutItems(); + invalidate(); +} + +void QQuickComponentsLinearLayout::updateLayoutItems() +{ + const QList<QQuickItem *> &children = childItems(); + + foreach (QQuickItem *child, children) + insertLayoutItem(child); +} + +void QQuickComponentsLinearLayout::itemChange(ItemChange change, const ItemChangeData &value) +{ + if (isComponentComplete()) { + if (change == ItemChildAddedChange) + insertLayoutItem(value.item); + else if (change == ItemChildRemovedChange) + removeLayoutItem(value.item); + } + + QQuickComponentsLayout::itemChange(change, value); +} + +void QQuickComponentsLinearLayout::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) +{ + QQuickComponentsLayout::geometryChanged(newGeometry, oldGeometry); + invalidate(); +} + +void QQuickComponentsLinearLayout::insertLayoutItem(QQuickItem *item) +{ + m_items.append(item); + setupItemLayout(item); + + invalidate(); + QObject::connect(item, SIGNAL(destroyed()), this, SLOT(onItemDestroyed())); +} + +void QQuickComponentsLinearLayout::removeLayoutItem(QQuickItem *item) +{ + if (!m_items.removeOne(item)) + return; + + invalidate(); + QObject::disconnect(item, SIGNAL(destroyed()), this, SLOT(onItemDestroyed())); +} + +void QQuickComponentsLinearLayout::onItemDestroyed() +{ + if (!m_items.removeOne(static_cast<QQuickItem *>(sender()))) + return; + + invalidate(); +} + +void QQuickComponentsLinearLayout::reconfigureLayout() +{ + if (!isComponentComplete()) + return; + + const int count = m_items.count(); + + if (count == 0) + return; + + qreal totalSpacing = 0; + qreal totalSizeHint = 0; + qreal totalMinimumSize = 0; + qreal totalMaximumSize = 0; + + QVector<QQuickComponentsLayoutInfo> itemData; + + for (int i = 0; i < count; i++) { + QQuickItem *item = m_items.at(i); + QObject *attached = qmlAttachedPropertiesObject<QQuickComponentsLayout>(item); + QQuickComponentsLayoutAttached *info = static_cast<QQuickComponentsLayoutAttached *>(attached); + + QQuickComponentsLayoutInfo data; + + if (m_orientation == Horizontal) { + data.sizeHint = item->implicitWidth(); + data.minimumSize = info->minimumWidth(); + data.maximumSize = info->maximumWidth(); + data.expansive = (info->horizontalSizePolicy() == QQuickComponentsLayout::Expanding); + data.stretch = info->horizontalSizePolicy() == Expanding ? 1.0 : 0; + } else { + data.sizeHint = item->implicitHeight(); + data.minimumSize = info->minimumHeight(); + data.maximumSize = info->maximumHeight(); + data.expansive = (info->verticalSizePolicy() == QQuickComponentsLayout::Expanding); + data.stretch = info->verticalSizePolicy() == Expanding ? 1.0 : 0; + } + + itemData.append(data); + + // sum + totalSizeHint += data.sizeHint; + totalMinimumSize += data.minimumSize; + totalMaximumSize += data.maximumSize; + + // don't count last spacing + if (i < count - 1) + totalSpacing += data.spacing + m_spacing; + } + + if (m_orientation == Horizontal) { + qDeclarativeLayoutCalculate(itemData, 0, count, 0, width(), m_spacing); + + for (int i = 0; i < count; i++) { + QQuickItem *item = m_items.at(i); + const QQuickComponentsLayoutInfo &data = itemData.at(i); + + item->setX(data.pos); + item->setY(height()/2 - item->height()/2); + item->setWidth(data.size); + } + } else { + qDeclarativeLayoutCalculate(itemData, 0, count, 0, height(), m_spacing); + + for (int i = 0; i < count; i++) { + QQuickItem *item = m_items.at(i); + const QQuickComponentsLayoutInfo &data = itemData.at(i); + + item->setY(data.pos); + item->setX(width()/2 - item->width()/2); + item->setHeight(data.size); + } + } + + // propagate hints to upper levels + QObject *attached = qmlAttachedPropertiesObject<QQuickComponentsLayout>(this); + QQuickComponentsLayoutAttached *info = static_cast<QQuickComponentsLayoutAttached *>(attached); + + if (m_orientation == Horizontal) { + setImplicitWidth(totalSizeHint); + info->setMinimumWidth(totalMinimumSize + totalSpacing); + info->setMaximumWidth(totalMaximumSize + totalSpacing); + } else { + setImplicitHeight(totalSizeHint); + info->setMinimumHeight(totalMinimumSize + totalSpacing); + info->setMaximumHeight(totalMaximumSize + totalSpacing); + } +} |