1 files changed, 77 insertions, 0 deletions
diff --git a/dw/stackingcontextmgr.hh b/dw/stackingcontextmgr.hh
new file mode 100644
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--- /dev/null
+++ b/dw/stackingcontextmgr.hh
@@ -0,0 +1,77 @@
+#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,
+              StackingIteratorStack *iteratorStack, Widget **interruptedWidget,
+              int *zIndexIndex, int startZIndex, int endZIndex, int *index);
+   Widget *getWidgetAtPoint (int x, int y, StackingIteratorStack *iteratorStack,
+                             Widget **interruptedWidget, int *zIndexIndex,
+                             int startZIndex, int endZIndex, int *index);
+
+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 (); }
+
+   void drawBottom (View *view, Rectangle *area,
+                    StackingIteratorStack *iteratorStack,
+                    Widget **interruptedWidget, int *zIndexIndex, int *index);
+   void drawTop (View *view, Rectangle *area,
+                 StackingIteratorStack *iteratorStack,
+                 Widget **interruptedWidget, int *zIndexIndex, int *index);
+
+   Widget *getTopWidgetAtPoint (int x, int y,
+                                core::StackingIteratorStack *iteratorStack,
+                                Widget **interruptedWidget,
+                                int *zIndexIndex, int *index);
+   Widget *getBottomWidgetAtPoint (int x, int y,
+                                   core::StackingIteratorStack *iteratorStack,
+                                   Widget **interruptedWidget,
+                                   int *zIndexIndex, int *index);
+};
+
+} // namespace core
+
+} // namespace dw
+
+#endif // __DW_STACKINGCONTEXTMGR_HH__