1 files changed, 75 insertions, 0 deletions
diff --git a/dw/stackingcontextmgr.hh b/dw/stackingcontextmgr.hh
new file mode 100644
index 00000000..3a877031
--- /dev/null
+++ b/dw/stackingcontextmgr.hh
@@ -0,0 +1,75 @@
+#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 {
+
+/**
+ * \brief See \ref dw-stacking-context.
+ */
+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 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__