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Diffstat (limited to 'src/qquicklayout.cpp')
| -rw-r--r-- | src/qquicklayout.cpp | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/src/qquicklayout.cpp b/src/qquicklayout.cpp new file mode 100644 index 00000000..918b307c --- /dev/null +++ b/src/qquicklayout.cpp @@ -0,0 +1,195 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** 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 Nokia Corporation 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 "qquicklayout.h" +#include <QEvent> +#include <QApplication> +#include <QtCore/qnumeric.h> + + +static const qreal q_declarativeLayoutMaxSize = 10e8; + + +QQuickComponentsLayoutAttached::QQuickComponentsLayoutAttached(QObject *parent) + : QObject(parent), + m_minimumWidth(0), + m_minimumHeight(0), + m_maximumWidth(q_declarativeLayoutMaxSize), + m_maximumHeight(q_declarativeLayoutMaxSize), + m_verticalSizePolicy(QQuickComponentsLayout::Fixed), + m_horizontalSizePolicy(QQuickComponentsLayout::Fixed) +{ + +} + +void QQuickComponentsLayoutAttached::setMinimumWidth(qreal width) +{ + if (qIsNaN(width) || m_minimumWidth == width) + return; + + m_minimumWidth = width; + updateLayout(); +} + +void QQuickComponentsLayoutAttached::setMinimumHeight(qreal height) +{ + if (qIsNaN(height) || m_minimumHeight == height) + return; + + m_minimumHeight = height; + updateLayout(); +} + +void QQuickComponentsLayoutAttached::setMaximumWidth(qreal width) +{ + if (qIsNaN(width) || m_maximumWidth == width) + return; + + m_maximumWidth = width; + updateLayout(); +} + +void QQuickComponentsLayoutAttached::setMaximumHeight(qreal height) +{ + if (qIsNaN(height) || m_maximumHeight == height) + return; + + m_maximumHeight = height; + updateLayout(); +} + +void QQuickComponentsLayoutAttached::setVerticalSizePolicy(QQuickComponentsLayout::SizePolicy policy) +{ + if (m_verticalSizePolicy != policy) { + m_verticalSizePolicy = policy; + updateLayout(); + } +} + +void QQuickComponentsLayoutAttached::setHorizontalSizePolicy(QQuickComponentsLayout::SizePolicy policy) +{ + if (m_horizontalSizePolicy != policy) { + m_horizontalSizePolicy = policy; + updateLayout(); + } +} + +void QQuickComponentsLayoutAttached::updateLayout() +{ + if (m_layout) + m_layout->invalidate(); +} + + + +QQuickComponentsLayout::QQuickComponentsLayout(QQuickItem *parent) + : QQuickItem(parent), + m_dirty(false) +{ + +} + +QQuickComponentsLayout::~QQuickComponentsLayout() +{ + +} + +void QQuickComponentsLayout::setupItemLayout(QQuickItem *item) +{ + QObject *attached = qmlAttachedPropertiesObject<QQuickComponentsLayout>(item); + QQuickComponentsLayoutAttached *info = static_cast<QQuickComponentsLayoutAttached *>(attached); + info->m_layout = this; +} + +QQuickComponentsLayoutAttached *QQuickComponentsLayout::qmlAttachedProperties(QObject *object) +{ + return new QQuickComponentsLayoutAttached(object); +} + +bool QQuickComponentsLayout::event(QEvent *e) +{ + if (e->type() == QEvent::LayoutRequest) + reconfigureTopDown(); + + return QQuickItem::event(e); +} + +void QQuickComponentsLayout::invalidate() +{ + if (m_dirty) + return; + + QQuickComponentsLayout *layout = this; + QQuickComponentsLayout *parentLayout = 0; + + while (!layout->m_dirty) { + layout->m_dirty = true; + parentLayout = qobject_cast<QQuickComponentsLayout *>(layout->parentItem()); + + if (!parentLayout) + break; + else + layout = parentLayout; + } + + // just post events for top level layouts + if (!parentLayout) + QApplication::postEvent(layout, new QEvent(QEvent::LayoutRequest)); +} + +void QQuickComponentsLayout::reconfigureTopDown() +{ + const QList<QQuickItem *> &children = childItems(); + + reconfigureLayout(); + + foreach (QQuickItem *child, children) { + QQuickComponentsLayout *layout = qobject_cast<QQuickComponentsLayout *>(child); + + if (layout && layout->m_dirty) + layout->reconfigureTopDown(); + } + + m_dirty = false; +} + +void QQuickComponentsLayout::reconfigureLayout() +{ + +} |