canvas::Layout: support for contents margins.

[simgear.git] / simgear / props / PropertyBasedElement.cxx

diff --git a/simgear/props/PropertyBasedElement.cxx b/simgear/props/PropertyBasedElement.cxx
index 88a0ad2ce52c7bec7a980e1a06a3f44457f54b74..f9f7fb278042a726dedf7dd390c664f0f5759a2a 100644 (file)
--- a/simgear/props/PropertyBasedElement.cxx
+++ b/simgear/props/PropertyBasedElement.cxx
@@ -12,38 +12,141 @@
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 // Library General Public License for more details.
 //
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
 
 #include "PropertyBasedElement.hxx"
+#include <boost/algorithm/string/predicate.hpp>
 
 namespace simgear
 {
 
-  //------------------------------------------------------------------------------
+  //----------------------------------------------------------------------------
   PropertyBasedElement::PropertyBasedElement(SGPropertyNode* node):
     _node(node)
   {
     _node->addChangeListener(this);
   }
 
-  //------------------------------------------------------------------------------
+  //----------------------------------------------------------------------------
   PropertyBasedElement::~PropertyBasedElement()
   {
-    _node->removeChangeListener(this);
+    onDestroy();
+    removeListener();
   }
 
-  //------------------------------------------------------------------------------
+  //----------------------------------------------------------------------------
+  void PropertyBasedElement::removeListener()
+  {
+    if( _node )
+      _node->removeChangeListener(this);
+  }
+
+  //----------------------------------------------------------------------------
+  void PropertyBasedElement::destroy()
+  {
+    if( !_node )
+      return;
+
+    // TODO check if really not in use anymore
+    if( _node->getParent() )
+      _node->getParent()
+           ->removeChild(_node->getName(), _node->getIndex());
+  }
+
+  //----------------------------------------------------------------------------
   SGConstPropertyNode_ptr PropertyBasedElement::getProps() const
   {
     return _node;
   }
 
-  //------------------------------------------------------------------------------
+  //----------------------------------------------------------------------------
   SGPropertyNode_ptr PropertyBasedElement::getProps()
   {
     return _node;
   }
 
+  //----------------------------------------------------------------------------
+  bool PropertyBasedElement::hasDataProp(const std::string& name) const
+  {
+    return getDataProp<SGPropertyNode*>(name) != NULL;
+  }
+
+  //----------------------------------------------------------------------------
+  void PropertyBasedElement::removeDataProp(const std::string& name)
+  {
+    SGPropertyNode* node = getDataProp<SGPropertyNode*>(name);
+    if( node )
+      _node->removeChild(node);
+  }
+
+  //----------------------------------------------------------------------------
+  static const std::string DATA_PREFIX("data-");
+
+  //----------------------------------------------------------------------------
+  std::string PropertyBasedElement::dataPropToAttrName(const std::string& name)
+  {
+    // http://www.w3.org/TR/html5/dom.html#attr-data-*
+    //
+    // 3. Insert the string data- at the front of name.
+
+    std::string attr_name;
+    for( std::string::const_iterator cur = name.begin();
+                                     cur != name.end();
+                                   ++cur )
+    {
+      // If name contains a "-" (U+002D) character followed by a lowercase ASCII
+      // letter, throw a SyntaxError exception and abort these steps.
+      if( *cur == '-' )
+      {
+        std::string::const_iterator next = cur + 1;
+        if( next != name.end() && islower(*next) )
+          return std::string();
+      }
+
+      // For each uppercase ASCII letter in name, insert a "-" (U+002D)
+      // character before the character and replace the character with the same
+      // character converted to ASCII lowercase.
+      if( isupper(*cur) )
+      {
+        attr_name.push_back('-');
+        attr_name.push_back( tolower(*cur) );
+      }
+      else
+        attr_name.push_back( *cur );
+    }
+    return DATA_PREFIX + attr_name;
+  }
+
+  //----------------------------------------------------------------------------
+  std::string PropertyBasedElement::attrToDataPropName(const std::string& name)
+  {
+    // http://www.w3.org/TR/html5/dom.html#attr-data-*
+    //
+    // For each "-" (U+002D) character in the name that is followed by a
+    // lowercase ASCII letter, remove the "-" (U+002D) character and replace the
+    // character that followed it by the same character converted to ASCII
+    // uppercase.
+
+    if( !boost::starts_with(name, DATA_PREFIX) )
+      return std::string();
+
+    std::string data_name;
+    for( std::string::const_iterator cur = name.begin() + DATA_PREFIX.length();
+                                     cur != name.end();
+                                   ++cur )
+    {
+      std::string::const_iterator next = cur + 1;
+      if( *cur == '-' && next != name.end() && islower(*next) )
+      {
+        data_name.push_back( toupper(*next) );
+        cur = next;
+      }
+      else
+        data_name.push_back(*cur);
+    }
+    return data_name;
+  }
+
 } // namespace simgear