* Extend ValueNode to be able to indicate that a node needs child creation

requests delayed until its location/value have been resolved. Update
  VariablesView to make use of that flag.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42333 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/debugger/user_interface/gui/team_window/VariablesView.cpp

@@ -853,6 +853,13 @@ VariablesView::VariableTableModel::ValueNodeValueChanged(ValueNode* valueNode)
 	if (modelNode == NULL)
 		return;
 
+	if (valueNode->ChildCreationNeedsValue()
+		&& !valueNode->ChildrenCreated()) {
+		status_t error = valueNode->CreateChildren();
+		if (error != B_OK)
+			return;
+	}
+
 	// check whether the value actually changed
 	Value* value = valueNode->GetValue();
 	if (value == modelNode->GetValue())
@@ -1115,6 +1122,11 @@ VariablesView::VariableTableModel::_AddChildNodes(ValueNodeChild* nodeChild)
 		valueNode = nodeChild->Node();
 	}
 
+	// check if this node requires child creation
+	// to be deferred until after its location/value have been resolved
+	if (valueNode->ChildCreationNeedsValue())
+		return B_OK;
+
 	// create the children, if not done yet
 	if (valueNode->ChildrenCreated())
 		return B_OK;

src/apps/debugger/value/ValueNode.h

@@ -47,6 +47,8 @@ public:
 									{ return fContainer; }
 			void				SetContainer(ValueNodeContainer* container);
 
+			virtual bool		ChildCreationNeedsValue() const
+									{ return false; }
 			bool				ChildrenCreated() const
 									{ return fChildrenCreated; }
 	virtual	status_t			CreateChildren() = 0;