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Diffstat (limited to 'src/imports/layouts/qquickgridlayoutengine_p.h')
| -rw-r--r-- | src/imports/layouts/qquickgridlayoutengine_p.h | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/imports/layouts/qquickgridlayoutengine_p.h b/src/imports/layouts/qquickgridlayoutengine_p.h new file mode 100644 index 0000000000..86f56a5af4 --- /dev/null +++ b/src/imports/layouts/qquickgridlayoutengine_p.h @@ -0,0 +1,164 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the Qt Quick Layouts module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 https://www.qt.io/terms-conditions. For further +** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QQUICKGRIDLAYOUTENGINE_P_H +#define QQUICKGRIDLAYOUTENGINE_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists for the convenience +// of the graphics view layout classes. This header +// file may change from version to version without notice, or even be removed. +// +// We mean it. +// + +#include <QtGui/private/qgridlayoutengine_p.h> +#include <QtGui/private/qlayoutpolicy_p.h> +#include <QtCore/qmath.h> + +#include "qquickitem.h" +#include "qquicklayout_p.h" +#include "qdebug.h" +QT_BEGIN_NAMESPACE + +class QQuickGridLayoutItem : public QGridLayoutItem { +public: + QQuickGridLayoutItem(QQuickItem *item, int row, int column, + int rowSpan = 1, int columnSpan = 1, Qt::Alignment alignment = 0) + : QGridLayoutItem(row, column, rowSpan, columnSpan, alignment), m_item(item), sizeHintCacheDirty(true), useFallbackToWidthOrHeight(true) {} + + + QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint) const + { + Q_UNUSED(constraint); // Quick Layouts does not support constraint atm + return effectiveSizeHints()[which]; + } + + QSizeF *effectiveSizeHints() const + { + if (!sizeHintCacheDirty) + return cachedSizeHints; + + QQuickLayout::effectiveSizeHints_helper(m_item, cachedSizeHints, 0, useFallbackToWidthOrHeight); + useFallbackToWidthOrHeight = false; + + sizeHintCacheDirty = false; + return cachedSizeHints; + } + + void setCachedSizeHints(QSizeF *sizeHints) + { + for (int i = 0; i < Qt::NSizeHints; ++i) { + cachedSizeHints[i] = sizeHints[i]; + } + sizeHintCacheDirty = false; + } + + void invalidate() + { + quickLayoutDebug() << "engine::invalidate()"; + sizeHintCacheDirty = true; + } + + QLayoutPolicy::Policy sizePolicy(Qt::Orientation orientation) const + { + return QQuickLayout::effectiveSizePolicy_helper(m_item, orientation, attachedLayoutObject(m_item, false)); + } + + void setGeometry(const QRectF &rect) + { + QQuickLayoutAttached *info = attachedLayoutObject(m_item, false); + const QRectF r = info ? rect.marginsRemoved(info->qMargins()) : rect; + const QSizeF oldSize(m_item->width(), m_item->height()); + const QSizeF newSize = r.size(); + m_item->setPosition(r.topLeft()); + if (newSize == oldSize) { + if (QQuickLayout *lay = qobject_cast<QQuickLayout *>(m_item)) { + if (lay->arrangementIsDirty()) + lay->rearrange(newSize); + } + } else { + m_item->setSize(newSize); + } + } + + QQuickItem *layoutItem() const { return m_item; } + + QQuickItem *m_item; +private: + mutable QSizeF cachedSizeHints[Qt::NSizeHints]; + mutable unsigned sizeHintCacheDirty : 1; + mutable unsigned useFallbackToWidthOrHeight : 1; +}; + +class QQuickGridLayoutEngine : public QGridLayoutEngine { +public: + QQuickGridLayoutEngine() : QGridLayoutEngine(Qt::AlignVCenter, true /*snapToPixelGrid*/) { } + + int indexOf(QQuickItem *item) const { + for (int i = 0; i < q_items.size(); ++i) { + if (item == static_cast<QQuickGridLayoutItem*>(q_items.at(i))->layoutItem()) + return i; + } + return -1; + } + + QQuickGridLayoutItem *findLayoutItem(QQuickItem *layoutItem) const + { + for (int i = q_items.count() - 1; i >= 0; --i) { + QQuickGridLayoutItem *item = static_cast<QQuickGridLayoutItem*>(q_items.at(i)); + if (item->layoutItem() == layoutItem) + return item; + } + return 0; + } + + void setAlignment(QQuickItem *quickItem, Qt::Alignment alignment); + Qt::Alignment alignment(QQuickItem *quickItem) const; + +}; + + + +QT_END_NAMESPACE + +#endif // QQUICKGRIDLAYOUTENGINE_P_H |