annotate widgets/FlowLayout.cpp @ 282:d9319859a4cf tip

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/****************************************************************************
**
** Copyright (C) 2004-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
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** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
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#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)
{
    m_itemList.append(item);
}

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

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

QLayoutItem *FlowLayout::takeAt(int index)
{
    if (index >= 0 && index < m_itemList.size())
        return m_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;
    QLayoutItem *itemXMax = 0;
    QLayoutItem *itemYMax = 0;
    foreach (item, m_itemList)
	{
		//init itemXMax and itemYMax 
		if ((itemXMax == 0) && (itemYMax == 0))
		{
			itemXMax = item;
			itemYMax = item;
		}

		//find XMax
		if ( (itemXMax->geometry().x() < item->geometry().x()) ||
			 ( (itemXMax->geometry().x() == item->geometry().x()) && (itemXMax->geometry().width() < item->geometry().width()) ) )
		{
			itemXMax = item;
		}

        //find YMax
		if ( (itemYMax->geometry().y() < item->geometry().y()) ||
			( (itemYMax->geometry().y() == item->geometry().y()) && (itemYMax->geometry().height() < item->geometry().height()) ) )
		{
			itemYMax = item;
		}
	}

	if ((itemXMax != 0) && (itemYMax != 0))
		size = QSize(itemXMax->geometry().x() + itemXMax->minimumSize().width(), itemYMax->geometry().y() + itemYMax->minimumSize().height());

    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, m_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();
}