flowlayout.h Example File

graphicsview/flowlayout/flowlayout.h
 /****************************************************************************
 **
 ** Copyright (C) 2015 The Qt Company Ltd.
 ** Contact: http://www.qt.io/licensing/
 **
 ** 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 The Qt Company Ltd 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 <QtGui/qgraphicslayout.h>

 class FlowLayout : public QGraphicsLayout
 {
 public:
     FlowLayout();
     inline void addItem(QGraphicsLayoutItem *item);
     void insertItem(int index, QGraphicsLayoutItem *item);
     void setSpacing(Qt::Orientations o, qreal spacing);
     qreal spacing(Qt::Orientation o) const;

     // inherited functions
     void setGeometry(const QRectF &geom);

     int count() const;
     QGraphicsLayoutItem *itemAt(int index) const;
     void removeAt(int index);

 protected:
     QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;

 private:
     qreal doLayout(const QRectF &geom, bool applyNewGeometry) const;
     QSizeF minSize(const QSizeF &constraint) const;
     QSizeF prefSize() const;
     QSizeF maxSize() const;

     QList<QGraphicsLayoutItem*> m_items;
     qreal m_spacing[2];
 };

 inline void FlowLayout::addItem(QGraphicsLayoutItem *item)
 {
     insertItem(-1, item);
 }