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    41 

    42 #ifndef QGRAPHICSLAYOUT_P_H

    43 #define QGRAPHICSLAYOUT_P_H

    44 

    45 //

    46 //  W A R N I N G

    47 //  -------------

    48 //

    49 // This file is not part of the Qt API.  It exists for the convenience

    50 // of other Qt classes.  This header file may change from version to

    51 // version without notice, or even be removed.

    52 //

    53 // We mean it.

    54 //

    55 

    56 #include <QtCore/qglobal.h>

    57 

    58 #if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW

    59 

    60 #include "qgraphicslayout.h"

    61 #include "qgraphicslayoutitem_p.h"

    62 #include <QtGui/qstyle.h>

    63 #include <QtGui/qwidget.h>

    64 #include <QtGui/qstyleoption.h>

    65 

    66 QT_BEGIN_NAMESPACE

    67 

    68 class QGraphicsLayoutItem;

    69 class QGraphicsWidget;

    70 

    71 #ifdef QT_DEBUG

    72 inline bool qt_graphicsLayoutDebug()

    73 {

    74     static int checked_env = -1;

    75     if(checked_env == -1)

    76         checked_env = !!qgetenv("QT_GRAPHICSLAYOUT_DEBUG").toInt();

    77     return checked_env;

    78 }

    79 #endif

    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 };

   129 

   130 class Q_AUTOTEST_EXPORT QGraphicsLayoutPrivate : public QGraphicsLayoutItemPrivate

   131 {

   132     Q_DECLARE_PUBLIC(QGraphicsLayout)

   133 

   134 public:

   135     QGraphicsLayoutPrivate() : QGraphicsLayoutItemPrivate(0, true), left(-1.0), top(-1.0), right(-1.0), bottom(-1.0), 

   136         activated(true) { }

   137 

   138     void reparentChildItems(QGraphicsItem *newParent);

   139     void getMargin(qreal *result, qreal userMargin, QStyle::PixelMetric pm) const;

   140     Qt::LayoutDirection visualDirection() const;

   141 

   142     void addChildLayoutItem(QGraphicsLayoutItem *item);

   143     void activateRecursive(QGraphicsLayoutItem *item);

   144 

   145     qreal left, top, right, bottom;

   146     bool activated;

   147 };

   148 

   149 

   150 QT_END_NAMESPACE

   151         

   152 #endif //QT_NO_GRAPHICSVIEW

   153 

   154 #endif