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    41 

    42 //! [0]

    43 #ifndef CARD_H

    44 #define CARD_H

    45 

    46 #include <QtGui>

    47 #include <QList>

    48 

    49 class CardLayout : public QLayout

    50 {

    51 public:

    52     CardLayout(QWidget *parent, int dist): QLayout(parent, 0, dist) {}

    53     CardLayout(QLayout *parent, int dist): QLayout(parent, dist) {}

    54     CardLayout(int dist): QLayout(dist) {}

    55     ~CardLayout();

    56 

    57     void addItem(QLayoutItem *item);

    58     QSize sizeHint() const;

    59     QSize minimumSize() const;

    60 	QLayoutItem *count() const;

    61     QLayoutItem *itemAt(int) const;

    62     QLayoutItem *takeAt(int);

    63     void setGeometry(const QRect &rect);

    64 

    65 private:

    66     QList<QLayoutItem*> list;

    67 };

    68 #endif

    69 //! [0]

    70 

    71 

    72 //! [1]

    73 //#include "card.h"

    74 //! [1]

    75 

    76 //! [2]

    77 QLayoutItem *CardLayout::count() const

    78 {

    79 	// QList::size() returns the number of QLayoutItems in the list

    80     return list.size();

    81 }

    82 //! [2]

    83 

    84 //! [3]

    85 QLayoutItem *CardLayout::itemAt(int idx) const

    86 {

    87     // QList::value() performs index checking, and returns 0 if we are

    88     // outside the valid range

    89     return list.value(idx);

    90 }

    91 

    92 QLayoutItem *CardLayout::takeAt(int idx)

    93 {

    94     // QList::take does not do index checking

    95     return idx >= 0 && idx < list.size() ? list.takeAt(idx) : 0;

    96 }

    97 //! [3]

    98 

    99 

   100 //! [4]

   101 void CardLayout::addItem(QLayoutItem *item)

   102 {

   103     list.append(item);

   104 }

   105 //! [4]

   106 

   107 

   108 //! [5]

   109 CardLayout::~CardLayout()

   110 {

   111      QLayoutItem *item;

   112      while ((item = takeAt(0)))

   113          delete item;

   114 }

   115 //! [5]

   116 

   117 

   118 //! [6]

   119 void CardLayout::setGeometry(const QRect &r)

   120 {

   121     QLayout::setGeometry(r);

   122 

   123     if (list.size() == 0)

   124         return;

   125 

   126     int w = r.width() - (list.count() - 1) * spacing();

   127     int h = r.height() - (list.count() - 1) * spacing();

   128     int i = 0;

   129     while (i < list.size()) {

   130         QLayoutItem *o = list.at(i);

   131         QRect geom(r.x() + i * spacing(), r.y() + i * spacing(), w, h);

   132         o->setGeometry(geom);

   133         ++i;

   134     }

   135 }

   136 //! [6]

   137 

   138 

   139 //! [7]

   140 QSize CardLayout::sizeHint() const

   141 {

   142     QSize s(0,0);

   143     int n = list.count();

   144     if (n > 0)

   145         s = QSize(100,70); //start with a nice default size

   146     int i = 0;

   147     while (i < n) {

   148         QLayoutItem *o = list.at(i);

   149         s = s.expandedTo(o->sizeHint());

   150         ++i;

   151     }

   152     return s + n*QSize(spacing(), spacing());

   153 }

   154 

   155 QSize CardLayout::minimumSize() const

   156 {

   157     QSize s(0,0);

   158     int n = list.count();

   159     int i = 0;

   160     while (i < n) {

   161         QLayoutItem *o = list.at(i);

   162         s = s.expandedTo(o->minimumSize());

   163         ++i;

   164     }

   165     return s + n*QSize(spacing(), spacing());

   166 }

   167 //! [7]