Z-Index and stacking contexts: start.

1 files changed, 77 insertions, 0 deletions

diff --git a/dw/stackingcontextmgr.cc b/dw/stackingcontextmgr.cc
new file mode 100644
index 00000000..aeafc400
--- /dev/null
+++ b/dw/stackingcontextmgr.cc
@@ -0,0 +1,77 @@
+/*
+ * Dillo Widget
+ *
+ * Copyright 2014 Sebastian Geerken <sgeerken@dillo.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "core.hh"
+#include "../lout/debug.hh"
+
+using namespace lout::misc;
+using namespace lout::container::typed;
+
+namespace dw {
+
+namespace core {
+
+StackingContextMgr::StackingContextMgr (Widget *widget)
+{
+   DBG_OBJ_CREATE ("dw::core::StackingContextMgr");
+   scWidgets = new Vector<Widget> (1, false);
+   DBG_OBJ_SET_NUM ("scWidgets.size", scWidgets->size());
+
+   minZIndex = maxZIndex = 0; // Just to have some defined values.
+}
+
+StackingContextMgr::~StackingContextMgr ()
+{
+   delete scWidgets;
+   DBG_OBJ_DELETE ();
+}
+
+void StackingContextMgr::addChildSCWidget (Widget *widget)
+{
+   if (scWidgets->size () == 0)
+      minZIndex = maxZIndex = widget->getStyle()->zIndex;
+   else {
+      minZIndex = min (minZIndex, widget->getStyle()->zIndex);
+      maxZIndex = max (maxZIndex, widget->getStyle()->zIndex);
+   }
+
+   scWidgets->put (widget);
+   DBG_OBJ_SET_NUM ("scWidgets.size", scWidgets->size());
+   DBG_OBJ_ARRSET_PTR ("scWidgets", scWidgets->size() - 1, widget);
+}
+
+void StackingContextMgr::draw (View *view, Rectangle *area, int startZIndex,
+                               int endZIndex)
+{
+   for (int zIndex = max (minZIndex, startZIndex);
+        zIndex <= min (maxZIndex, endZIndex); zIndex++) {
+      for (int i = 0; i < scWidgets->size (); i++) {
+         Widget *child = scWidgets->get (i);
+         Rectangle childArea;
+         if (child->intersects (area, &childArea))
+            child->draw (view, &childArea);
+      }
+   }
+}
+
+
+} // namespace core
+
+} // namespace dw