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

borderlayout.cpp Example File
layouts/borderlayout/borderlayout.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License versions 2.0 or 3.0 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://www.fsf.org/licensing/licenses/info/GPLv2.html and
 ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
 ** exception, Nokia gives you certain additional rights. These rights
 ** are described in the Nokia Qt GPL Exception version 1.3, included in
 ** the file GPL_EXCEPTION.txt in this package.
 **
 ** Qt for Windows(R) Licensees
 ** As a special exception, Nokia, 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.
 **
 ** If you are unsure which license is appropriate for your use, please
 ** contact the sales department at [email protected].
 **
 ****************************************************************************/

 #include <QtGui>

 #include "borderlayout.h"

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

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

 BorderLayout::~BorderLayout()
 {
     QLayoutItem *l;
     while ((l = takeAt(0)))
         delete l;
 }

 void BorderLayout::addItem(QLayoutItem *item)
 {
     add(item, West);
 }

 void BorderLayout::addWidget(QWidget *widget, Position position)
 {
     add(new QWidgetItem(widget), position);
 }

 Qt::Orientations BorderLayout::expandingDirections() const
 {
     return Qt::Horizontal | Qt::Vertical;
 }

 bool BorderLayout::hasHeightForWidth() const
 {
     return false;
 }

 int BorderLayout::count() const
 {
     return list.size();
 }

 QLayoutItem *BorderLayout::itemAt(int index) const
 {
     ItemWrapper *wrapper = list.value(index);
     if (wrapper)
         return wrapper->item;
     else
         return 0;
 }

 QSize BorderLayout::minimumSize() const
 {
     return calculateSize(MinimumSize);
 }

 void BorderLayout::setGeometry(const QRect &rect)
 {
     ItemWrapper *center = 0;
     int eastWidth = 0;
     int westWidth = 0;
     int northHeight = 0;
     int southHeight = 0;
     int centerHeight = 0;
     int i;

     QLayout::setGeometry(rect);

     for (i = 0; i < list.size(); ++i) {
         ItemWrapper *wrapper = list.at(i);
         QLayoutItem *item = wrapper->item;
         Position position = wrapper->position;

         if (position == North) {
             item->setGeometry(QRect(rect.x(), northHeight, rect.width(),
                                     item->sizeHint().height()));

             northHeight += item->geometry().height() + spacing();
         } else if (position == South) {
             item->setGeometry(QRect(item->geometry().x(),
                                     item->geometry().y(), rect.width(),
                                     item->sizeHint().height()));

             southHeight += item->geometry().height() + spacing();

             item->setGeometry(QRect(rect.x(),
                               rect.y() + rect.height() - southHeight + spacing(),
                               item->geometry().width(),
                               item->geometry().height()));
         } else if (position == Center) {
             center = wrapper;
         }
     }

     centerHeight = rect.height() - northHeight - southHeight;

     for (i = 0; i < list.size(); ++i) {
         ItemWrapper *wrapper = list.at(i);
         QLayoutItem *item = wrapper->item;
         Position position = wrapper->position;

         if (position == West) {
             item->setGeometry(QRect(rect.x() + westWidth, northHeight,
                                     item->sizeHint().width(), centerHeight));

             westWidth += item->geometry().width() + spacing();
         } else if (position == East) {
             item->setGeometry(QRect(item->geometry().x(), item->geometry().y(),
                                     item->sizeHint().width(), centerHeight));

             eastWidth += item->geometry().width() + spacing();

             item->setGeometry(QRect(
                               rect.x() + rect.width() - eastWidth + spacing(),
                               northHeight, item->geometry().width(),
                               item->geometry().height()));
         }
     }

     if (center)
         center->item->setGeometry(QRect(westWidth, northHeight,
                                         rect.width() - eastWidth - westWidth,
                                         centerHeight));
 }

 QSize BorderLayout::sizeHint() const
 {
     return calculateSize(SizeHint);
 }

 QLayoutItem *BorderLayout::takeAt(int index)
 {
     if (index >= 0 && index < list.size()) {
         ItemWrapper *layoutStruct = list.takeAt(index);
         return layoutStruct->item;
     }
     return 0;
 }

 void BorderLayout::add(QLayoutItem *item, Position position)
 {
     list.append(new ItemWrapper(item, position));
 }

 QSize BorderLayout::calculateSize(SizeType sizeType) const
 {
     QSize totalSize;

     for (int i = 0; i < list.size(); ++i) {
         ItemWrapper *wrapper = list.at(i);
         Position position = wrapper->position;
         QSize itemSize;

         if (sizeType == MinimumSize)
             itemSize = wrapper->item->minimumSize();
         else // (sizeType == SizeHint)
             itemSize = wrapper->item->sizeHint();

         if (position == North || position == South || position == Center)
             totalSize.rheight() += itemSize.height();

         if (position == West || position == East || position == Center)
             totalSize.rwidth() += itemSize.width();
     }
     return totalSize;
 }