From 4f2032a9c2f896803bca60c9d9a0e9af94316a31 Mon Sep 17 00:00:00 2001
From: Thomas Geymayer <tomgey@gmail.com>
Date: Wed, 30 Jul 2014 17:17:24 +0200
Subject: [PATCH] Canvas: export preventDefault to Nasal and use to stop events
 on DesktopGroup.

---
 src/Canvas/gui_mgr.cxx        | 21 +++++++++++++++------
 src/Scripting/NasalCanvas.cxx |  4 +++-
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/src/Canvas/gui_mgr.cxx b/src/Canvas/gui_mgr.cxx
index a4a47ffa7..b5ac7155e 100644
--- a/src/Canvas/gui_mgr.cxx
+++ b/src/Canvas/gui_mgr.cxx
@@ -132,6 +132,9 @@ class DesktopGroup:
 
     bool handleMouse(const osgGA::GUIEventAdapter& ea);
     bool handleKeyboard(const osgGA::GUIEventAdapter& ea);
+
+    bool handleRootEvent(const sc::EventPtr& event);
+
     void handleResize(int x, int y, int width, int height);
     void handleMouseMode(SGPropertyNode* node);
 
@@ -467,11 +470,7 @@ bool DesktopGroup::handleMouse(const osgGA::GUIEventAdapter& ea)
     return target_window->handleEvent(event);
   }
   else
-  {
-    // TODO somehow return if event has been consumed
-    sc::Element::handleEvent(event);
-    return false;
-  }
+    return handleRootEvent(event);
 }
 
 //------------------------------------------------------------------------------
@@ -512,9 +511,19 @@ bool DesktopGroup::handleKeyboard(const osgGA::GUIEventAdapter& ea)
 
   if( active_window )
     return active_window->handleEvent(event);
+  else
+    return handleRootEvent(event);
+}
 
+//------------------------------------------------------------------------------
+bool DesktopGroup::handleRootEvent(const sc::EventPtr& event)
+{
+  event->default_prevented = false;
   sc::Element::handleEvent(event);
-  return false;
+
+  // preventDefault() on DesktopGroup stops propagation to internal event
+  // handling.
+  return event->default_prevented;
 }
 
 //------------------------------------------------------------------------------
diff --git a/src/Scripting/NasalCanvas.cxx b/src/Scripting/NasalCanvas.cxx
index 637734c1c..a9d6fa265 100644
--- a/src/Scripting/NasalCanvas.cxx
+++ b/src/Scripting/NasalCanvas.cxx
@@ -399,7 +399,9 @@ naRef initNasalCanvas(naRef globals, naContext c)
     .member("type", &sc::Event::getTypeString)
     .member("target", &sc::Event::getTarget)
     .member("currentTarget", &sc::Event::getCurrentTarget)
-    .method("stopPropagation", &sc::Event::stopPropagation);
+    .member("defaultPrevented", &sc::Event::defaultPrevented)
+    .method("stopPropagation", &sc::Event::stopPropagation)
+    .method("preventDefault", &sc::Event::preventDefault);
 
   NasalCustomEvent::init("canvas.CustomEvent")
     .bases<NasalEvent>()
-- 
2.39.5