|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# flowlayout.cpp Example File
layouts/flowlayout/flowlayout.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2004-2007 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 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 GNU
     ** General Public Licensing requirements will be met:
     ** http://trolltech.com/products/qt/licenses/licensing/opensource/
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
     ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
     ** or contact the sales department at sales@trolltech.com.
     **
     ** In addition, as a special exception, Trolltech gives you certain
     ** additional rights. These rights are described in the Trolltech GPL
     ** Exception version 1.0, which can be found at
     ** http://www.trolltech.com/products/qt/gplexception/ and in the file
     ** GPL_EXCEPTION.txt in this package.
     **
     ** In addition, as a special exception, Trolltech, as the sole copyright
     ** holder for Qt Designer, grants users of the Qt/Eclipse Integration
     ** plug-in the right for the Qt/Eclipse Integration to link to
     ** functionality provided by Qt Designer and its related libraries.
     **
     ** Trolltech reserves all rights not expressly granted herein.
     **
     ** Trolltech ASA (c) 2007
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #include <QtGui>

     #include "flowlayout.h"

     FlowLayout::FlowLayout(QWidget *parent, int margin, int spacing)
         : QLayout(parent)
     {
         setMargin(margin);
         setSpacing(spacing);
     }

     FlowLayout::FlowLayout(int spacing)
     {
         setSpacing(spacing);
     }

     FlowLayout::~FlowLayout()
     {
         QLayoutItem *item;
         while ((item = takeAt(0)))
             delete item;
     }

     void FlowLayout::addItem(QLayoutItem *item)
     {
         itemList.append(item);
     }

     int FlowLayout::count() const
     {
         return itemList.size();
     }

     QLayoutItem *FlowLayout::itemAt(int index) const
     {
         return itemList.value(index);
     }

     QLayoutItem *FlowLayout::takeAt(int index)
     {
         if (index >= 0 && index < itemList.size())
             return itemList.takeAt(index);
         else
             return 0;
     }

     Qt::Orientations FlowLayout::expandingDirections() const
     {
         return 0;
     }

     bool FlowLayout::hasHeightForWidth() const
     {
         return true;
     }

     int FlowLayout::heightForWidth(int width) const
     {
         int height = doLayout(QRect(0, 0, width, 0), true);
         return height;
     }

     void FlowLayout::setGeometry(const QRect &rect)
     {
         QLayout::setGeometry(rect);
         doLayout(rect, false);
     }

     QSize FlowLayout::sizeHint() const
     {
         return minimumSize();
     }

     QSize FlowLayout::minimumSize() const
     {
         QSize size;
         QLayoutItem *item;
         foreach (item, itemList)
             size = size.expandedTo(item->minimumSize());

         size += QSize(2*margin(), 2*margin());
         return size;
     }

     int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
     {
         int x = rect.x();
         int y = rect.y();
         int lineHeight = 0;

         QLayoutItem *item;
         foreach (item, itemList) {
             int nextX = x + item->sizeHint().width() + spacing();
             if (nextX - spacing() > rect.right() && lineHeight > 0) {
                 x = rect.x();
                 y = y + lineHeight + spacing();
                 nextX = x + item->sizeHint().width() + spacing();
                 lineHeight = 0;
             }

             if (!testOnly)
                 item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));

             x = nextX;
             lineHeight = qMax(lineHeight, item->sizeHint().height());
         }
         return y + lineHeight - rect.y();
     }