i_layoutitem.h

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#ifndef i_layoutitem_h
#define i_layoutitem_h

/*+
________________________________________________________________________

 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        A.H. Lammertink
 Date:          29/06/2001
 RCS:           $Id$
________________________________________________________________________

-*/

#include "uibasemod.h"
#include "i_layout.h"
#include "uiobjbody.h"

#include <QSize>
#include <QWidget>

mFDQtclass(QLayoutItem)

mExpClass(uiBase) i_LayoutItem : public uiBody, public NamedObject
{   
    friend class                i_LayoutMngr;
    friend class                i_LayoutIterator;
#ifdef __debug__
    friend class                uiGroupParentBody;
#endif

public: 
                                i_LayoutItem(i_LayoutMngr&,
                                             mQtclass(QLayoutItem&));
    virtual                     ~i_LayoutItem();

    virtual int                 horAlign(LayoutMode m ) const
                                    { return curpos(m).left(); }
    virtual int                 centre(LayoutMode m, bool hor=true) const 
                                    { 
                                        if( hor ) return ( curpos(m).left() 
                                             + curpos(m).right() ) / 2; 
                                        return ( curpos(m).top()
                                             + curpos(m).bottom() ) / 2;
                                    }

    virtual uiSize              minimumsize() const 
                                {
                                    mQtclass(QSize) s =qwidget()->minimumSize();

                                        return
                                            uiSize( s.width(), s.height());
                                 }

    uiSize                      prefSize() const
                                { 
                                    if( prefSzDone ) 
                                       { pErrMsg("PrefSize already done.");}
                                    else
                                    {
                                        i_LayoutItem* self =
                                            const_cast<i_LayoutItem*>(this);
                                        self->prefSzDone = true;
                                        mQtclass(QSize) ps( qlayoutItm().sizeHint() );
                                        int width = ps.width();
                                        if ( width==0 ) width = 1;
                                        int height = ps.height();
                                        if ( height==0 ) height = 1;
                                        self->prefSz = 
                                            uiSize(width,height);
                                    }

                                    return prefSz;
                                }

    virtual void                invalidate();
    virtual void                updatedAlignment(LayoutMode)    {}
    virtual void                initChildLayout(LayoutMode)     {}

    uiSize                      actualsize(bool include_border = true) const;

    inline const i_LayoutMngr&  mngr() const            { return mngr_; } 

    inline const uiRect&        curpos(LayoutMode m) const
                                    { return layoutpos[m];}
    inline uiRect&              curpos(LayoutMode m)    { return layoutpos[m];}

    bool                        inited() const 
                                { 
                                    return minimum_pos_inited 
                                        || preferred_pos_inited; 
                                }

protected:

    bool                        preferred_pos_inited;
    bool                        minimum_pos_inited;

    uiRect                      layoutpos[ nLayoutMode ];

    int                         stretch( bool hor ) const;
    virtual void                commitGeometrySet(bool);

    void                        initLayout( LayoutMode m, int mngrTop, 
                                                          int mngrLeft );
    bool                        layout( LayoutMode m, const int, bool );

    void                        attach( constraintType, 
                                        i_LayoutItem *other, int margin,
                                        bool reciprocal=true);

    virtual uiObject*           objLayouted()           { return 0; }
    inline const uiObject*      objLayouted() const
                                { 
                                    return const_cast<i_LayoutItem*>
                                                        (this)->objLayouted(); 
                                }

    virtual uiObjectBody*       bodyLayouted()          { return 0; }
    inline const uiObjectBody*  bodyLayouted() const
                                { 
                                    return const_cast<i_LayoutItem*>
                                                        (this)->bodyLayouted(); 
                                }

    inline mQtclass(QLayoutItem&)       qlayoutItm()    { return *qlayoutitm; }
    inline const mQtclass(QLayoutItem&) qlayoutItm() const
                                        { return *qlayoutitm; }

                                // Immediately delete me if you take my
                                // qlayoutitm !!
    inline mQtclass(QLayoutItem*)  takeQlayoutItm()
                                   {
                                       mQtclass(QLayoutItem*) ret = qlayoutitm;
                                       qlayoutitm = 0;
                                       return ret;
                                   }

    virtual const mQtclass(QWidget*)    qwidget_() const
                                        { return qlayoutitm->widget(); }
    virtual const mQtclass(QWidget*)    managewidg_() const
                                        { return qlayoutitm->widget(); }

    inline i_LayoutMngr&        mngr()                  { return mngr_; } 

    bool                        isAligned() const;

private:

    mQtclass(QLayoutItem*)      qlayoutitm;
    i_LayoutMngr&               mngr_;

    constraintList              constrList;

#ifdef __debug__
    int                         isPosOk( uiConstraint*, int, bool );
#endif
    bool                        prefSzDone;
    uiSize                      prefSz;
    bool                        hsameas;
    bool                        vsameas;
};


mExpClass(uiBase) i_uiLayoutItem : public i_LayoutItem
{
public:
                        i_uiLayoutItem( i_LayoutMngr& mgr, uiObjectBody& obj )
                            : i_LayoutItem(mgr,
                                    *new mQtclass(QWidgetItem)(obj.qwidget()) )
                            , uiObjBody_(obj)           {}

    virtual             ~i_uiLayoutItem();

    virtual uiSize      minimumsize() const
                            { 
                                uiSize s = uiObjBody_.minimumsize();
                                if ( !mIsUdf(s.hNrPics()) )  
                                    return s;

                                return i_LayoutItem::minimumsize();
                            }

    virtual uiObject*     objLayouted() { return &uiObjBody_.uiObjHandle(); }
    virtual uiObjectBody* bodyLayouted(){ return &uiObjBody_; }


protected:

    uiObjectBody&       uiObjBody_;


};

#endif