source: trunk/doc/src/snippets/code/doc_src_layout.qdoc@ 5

//! [0]
#ifndef CARD_H
#define CARD_H

#include <QLayout>
#include <QList>

class CardLayout : public QLayout
{
public:
    CardLayout(QWidget *parent, int dist)
        : QLayout(parent, 0, dist) {}
    CardLayout(QLayout *parent, int dist)
        : QLayout(parent, dist) {}
    CardLayout(int dist)
        : QLayout(dist) {}
    ~CardLayout();

    void addItem(QLayoutItem *item);
    QSize sizeHint() const;
    QSize minimumSize() const;
    QLayoutItem *itemAt(int) const;
    QLayoutItem *takeAt(int);
    void setGeometry(const QRect &rect);

private:
    QList<QLayoutItem*> list;
};
#endif
//! [0]


//! [1]
#include "card.h"
//! [1]


//! [2]
QLayoutItem *CardLayout::itemAt(int idx) const
{
    // QList::value() performs index checking, and returns 0 if we are
    // outside the valid range
    return list.value(idx);
}

QLayoutItem *CardLayout::takeAt(int idx)
{
    // QList::take does not do index checking
    return idx >= 0 && idx < list.size() ? list.takeAt(idx) : 0;
}
//! [2]


//! [3]
void CardLayout::addItem(QLayoutItem *item)
{
    list.append(item);
}
//! [3]


//! [4]
CardLayout::~CardLayout()
{
    deleteAllItems();
}
//! [4]


//! [5]
void CardLayout::setGeometry(const QRect &r)
{
    QLayout::setGeometry(r);

    if (list.size() == 0)
        return;

    int w = r.width() - (list.count() - 1) * spacing();
    int h = r.height() - (list.count() - 1) * spacing();
    int i = 0;
    while (i < list.size()) {
        QLayoutItem *o = list.at(i);
        QRect geom(r.x() + i * spacing(), r.y() + i * spacing(), w, h);
        o->setGeometry(geom);
        ++i;
    }
}
//! [5]


//! [6]
QSize CardLayout::sizeHint() const
{
    QSize s(0,0);
    int n = list.count();
    if (n > 0)
        s = QSize(100,70); //start with a nice default size
    int i = 0;
    while (i < n) {
        QLayoutItem *o = list.at(i);
        s = s.expandedTo(o->sizeHint());
        ++i;
    }
    return s + n*QSize(spacing(), spacing());
}

QSize CardLayout::minimumSize() const
{
    QSize s(0,0);
    int n = list.count();
    int i = 0;
    while (i < n) {
        QLayoutItem *o = list.at(i);
        s = s.expandedTo(o->minimumSize());
        ++i;
    }
    return s + n*QSize(spacing(), spacing());
}
//! [6]