stackingcontextmgr.hh

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#ifndef __DW_STACKINGCONTEXTMGR_HH__
#define __DW_STACKINGCONTEXTMGR_HH__
 
#ifndef __INCLUDED_FROM_DW_CORE_HH__
#   error Do not include this file directly, use "core.hh" instead.
#endif
 
#include "../lout/container.hh"
 
#include <limits.h>
 
namespace dw {
 
namespace core {
 
class StackingContextMgr
{
private:
   Widget *widget;
   lout::container::typed::Vector<Widget> *childSCWidgets;
   int *zIndices, numZIndices;
 
   int findZIndex (int zIndex, bool mustExist);
   void draw (View *view, Rectangle *area, int startZIndex, int endZIndex,
              DrawingContext *context);
   Widget *getWidgetAtPoint (int x, int y,
                             core::GettingWidgetAtPointContext *context,
                             int startZIndex, int endZIndex);
 
public:
   StackingContextMgr (Widget *widget);
   ~StackingContextMgr ();
 
   inline static bool isEstablishingStackingContext (Widget *widget) {
      return IMPL_POS &&
         widget->getStyle()->position != style::POSITION_STATIC &&
         widget->getStyle()->zIndex != style::Z_INDEX_AUTO;
   }
 
   inline static bool handledByStackingContextMgr  (Widget *widget) {
      // Each widget establishing a stacking context is child of another
      // stacking context, so drawn by StackingContextMgr::drawTop or
      // StackingContextMgr::drawBottom etc.
      return widget->getParent () != NULL
         && isEstablishingStackingContext (widget);
   }
 
   void addChildSCWidget (Widget *widget);
 
   inline int getNumZIndices () { return numZIndices; }
   inline int getNumChildSCWidgets () { return childSCWidgets->size (); }
 
   inline void drawBottom (View *view, Rectangle *area, DrawingContext *context)
   { draw (view, area, INT_MIN, -1, context); }
   void drawTop (View *view, Rectangle *area, DrawingContext *context)
   { draw (view, area, 0, INT_MAX, context); }
 
   inline Widget *getTopWidgetAtPoint (int x, int y,
                                       core::GettingWidgetAtPointContext
                                       *context)
   { return getWidgetAtPoint (x, y, context, 0, INT_MAX); }
 
   inline Widget *getBottomWidgetAtPoint (int x, int y,
                                          core::GettingWidgetAtPointContext
                                          *context)
   { return getWidgetAtPoint (x, y, context, INT_MIN, -1); }
};
 
} // namespace core
 
} // namespace dw
 
#endif // __DW_STACKINGCONTEXTMGR_HH__