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/****************************************************************************
**
** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** 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 qt-sales@nokia.com.
**
****************************************************************************/
/** extended by Martin Witte for kradio4 **/
#include "buttonflowlayout4.h"
#include <math.h>
ButtonFlowLayout4::ButtonFlowLayout4(QWidget *parent, int margin, int spacing)
: QLayout(parent)
{
setMargin(margin);
setSpacing(spacing);
}
ButtonFlowLayout4::ButtonFlowLayout4(int spacing)
{
setSpacing(spacing);
}
ButtonFlowLayout4::~ButtonFlowLayout4()
{
QLayoutItem *item;
while ((item = takeAt(0)))
delete item;
}
void ButtonFlowLayout4::addItem(QLayoutItem *item)
{
m_itemList.append(item);
}
int ButtonFlowLayout4::count() const
{
return m_itemList.size();
}
QLayoutItem *ButtonFlowLayout4::itemAt(int index) const
{
return (index >= 0 && index < count()) ? m_itemList.value(index) : NULL;
}
QLayoutItem *ButtonFlowLayout4::takeAt(int index)
{
if (index >= 0 && index < m_itemList.size())
return m_itemList.takeAt(index);
else
return 0;
}
Qt::Orientations ButtonFlowLayout4::expandingDirections() const
{
return 0;
}
bool ButtonFlowLayout4::hasHeightForWidth() const
{
return true;
}
int ButtonFlowLayout4::heightForWidth(int width) const
{
if ( m_cached_width != width ) {
int height = doLayout(QRect(0, 0, width, 0), true);
//Not all C++ compilers support "mutable" yet:
ButtonFlowLayout4 * mthis = const_cast<ButtonFlowLayout4*>(this);
mthis->m_cached_hfw = height;
mthis->m_cached_width = width;
}
return m_cached_hfw;
}
void ButtonFlowLayout4::setGeometry(const QRect &rect)
{
QLayout::setGeometry(rect);
doLayout(rect, false);
}
QSize ButtonFlowLayout4::sizeHint() const
{
return minimumSize();
}
QSize ButtonFlowLayout4::minimumSize() const
{
return minimumSize(geometry().size());
}
QSize ButtonFlowLayout4::minimumSize(const QSize &s) const
{
QSize size;
QLayoutItem *item;
foreach (item, m_itemList) {
size = size.expandedTo(item->sizeHint());
}
size.setHeight(heightForWidth(s.width()));;
return size;
}
int ButtonFlowLayout4::doLayout(const QRect &r, bool testonly) const
{
float x = r.x();
float y = r.y();
int h = 0; //height of this line so far.
float buttonWidth = 0;
int buttonHeight = 0;
int linecount = 0;
int totalWidth = r.width();
int totalHeight = r.height();
// QList<QLayoutItem*>::const_iterator it = m_itemList.begin();
// get the width of the biggest Button
QLayoutItem *item;
foreach(item, m_itemList) {
buttonWidth = qMax(buttonWidth, (float)item->sizeHint().width());
buttonHeight = qMax(buttonHeight, item->sizeHint().height());
}
// calculate the optimal width
int bw_plus_sp = (int)buttonWidth + spacing();
int columns = bw_plus_sp ? (totalWidth + spacing()) / bw_plus_sp : 1;
if (columns > m_itemList.size()) {
columns = m_itemList.size();
}
if (columns <= 0) {
columns = 1; // avoid division by zero
}
int rows = (m_itemList.size() - 1) / columns + 1;
float deltaH = (float)(totalHeight - rows * buttonHeight - (rows - 1) * spacing())
/ (float)(rows + 1) ;
if (deltaH < 0) {
deltaH = 0;
}
y += deltaH;
buttonWidth = (float)(totalWidth - spacing() * (columns-1)) / (float)columns;
// calculate the positions and sizes
foreach(item, m_itemList) {
int btnRight = (int)rint(x + buttonWidth) - 1,
btnLeft = (int)rint(x);
if (btnRight > r.right() && h > 0) {
x = r.x();
btnRight = (int)rint(x + buttonWidth) - 1;
btnLeft = (int)rint(x);
y += h + spacing() + deltaH;
h = 0;
linecount++;
}
if (!testonly) {
item->setGeometry( QRect( QPoint( btnLeft, (int)rint(y) ),
QSize ( btnRight - btnLeft + 1, buttonHeight)));
}
x += buttonWidth + spacing();
h = qMax(h, buttonHeight);
}
int ret = (int)rint(y + h + deltaH) - r.y();
return ret;
}
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