--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/python/libs/widgets/astviewer.py	Sun Oct 07 17:13:47 2012 +0200
@@ -0,0 +1,36 @@
+from PyQt4.QtCore import *
+from PyQt4.QtGui import *
+
+def astToNamedElement(astNode, parentNode):
+   """ Helper to convert and AST tree to NamedElement tree: """
+   item = QStandardItem(str(astNode))
+   item.setData(astNode)
+   parentNode.appendRow(item)
+   for c in astNode.getChildren():
+      astToNamedElement(c, item)
+
+# The actual widget:
+class AstViewer(QTreeView):
+   sigNodeSelected = pyqtSignal(object)
+   def __init__(self, parent=None):
+      super(AstViewer, self).__init__(parent)
+      self.setHeaderHidden(True)
+      self.clicked.connect(self.selectHandler)
+
+   def setAst(self, ast):
+      """ Create a new model and add all ast elements to it """
+      model = QStandardItemModel()
+      if ast:
+         astToNamedElement(ast, model.invisibleRootItem())
+      self.setModel( model )
+      self.expandAll()
+
+   def selectHandler(self, index):
+      if not index.isValid():
+         return
+      model = self.model()
+      item = model.itemFromIndex(index)
+      node = item.data()
+      self.sigNodeSelected.emit(node)
+
+