63 #include <QtGui/qwidget.h>

    64 #include <QtGui/qstyleoption.h>

    80 

    81 

    82 class QLayoutStyleInfo

    83 {

    84 public:

    85     inline QLayoutStyleInfo() { invalidate(); }

    86     inline QLayoutStyleInfo(QStyle *style, QWidget *widget)

    87         : m_valid(true), m_style(style), m_widget(widget) 

    88     {

    89         Q_ASSERT(style);

    90         if (widget) //###

    91             m_styleOption.initFrom(widget);

    92         m_defaultSpacing[0] = style->pixelMetric(QStyle::PM_LayoutHorizontalSpacing);

    93         m_defaultSpacing[1] = style->pixelMetric(QStyle::PM_LayoutVerticalSpacing);

    94     }

    95 

    96     inline void invalidate() { m_valid = false; m_style = 0; m_widget = 0; }

    97 

    98     inline QStyle *style() const { return m_style; }

    99     inline QWidget *widget() const { return m_widget; }

   100 

   101     inline bool operator==(const QLayoutStyleInfo &other)

   102         { return m_style == other.m_style && m_widget == other.m_widget; }

   103     inline bool operator!=(const QLayoutStyleInfo &other)

   104         { return !(*this == other); }

   105 

   106     inline void setDefaultSpacing(Qt::Orientation o, qreal spacing){

   107         if (spacing >= 0)

   108             m_defaultSpacing[o - 1] = spacing;

   109     }

   110 

   111     inline qreal defaultSpacing(Qt::Orientation o) const {

   112         return m_defaultSpacing[o - 1];

   113     }

   114 

   115     inline qreal perItemSpacing(QSizePolicy::ControlType control1, 

   116                                   QSizePolicy::ControlType control2,

   117                                   Qt::Orientation orientation) const

   118     {

   119         Q_ASSERT(style());

   120         return style()->layoutSpacing(control1, control2, orientation, &m_styleOption, widget());

   121     }

   122 private:

   123     bool m_valid;

   124     QStyle *m_style;

   125     QWidget *m_widget;

   126     QStyleOption m_styleOption;

   127     qreal m_defaultSpacing[2];

   128 };