Method onKeyDown

Engine/source/gui/controls/guiTreeViewCtrl.cpp:2649–3031

keyboard movement of items is restricted to just one item at a time if more than one item is selected then movement operations are not performed

// keyboard movement of items is restricted to just one item at a time
// if more than one item is selected then movement operations are not performed
bool GuiTreeViewCtrl::onKeyDown( const GuiEvent& event )
{
   if ( !mVisible || !mActive || !mAwake )
      return false;

   // All the keyboard functionality requires a selected item, so if none exists...

   // Deal with enter and delete
   if ( event.modifier == 0 )
   {
      if ( event.keyCode == KEY_RETURN )
      {
         execAltConsoleCallback();
         return true;
      }

      if ( event.keyCode == KEY_DELETE && mDeleteObjectAllowed )
      {
         // Don't delete the root!
         if (mSelectedItems.empty())
            return true;

         //this may be fighting with the world editor delete
         deleteSelection();
         return true;
      }
 
     //call a generic bit of script that will let the subclass know that a key was pressed
     onKeyDown_callback( event.modifier, event.keyCode );
   }

   // only do operations if only one item is selected
   if ( mSelectedItems.empty() || (mSelectedItems.size() > 1))
      return false;

   Item* item = mSelectedItems.first();

   if ( !item )
      return false;

   // The Alt key lets you move items around!
   if ( mFlags.test(IsEditable) && event.modifier & SI_ALT )
   {
      switch ( event.keyCode )
      {
      case KEY_UP:
         // Move us up.
         if ( item->mPrevious )
         {
            moveItemUp( item->mId );
            scrollVisible(item);
         }
         return true;

      case KEY_DOWN:
         // Move the item under us up.
         if ( item->mNext )
         {