Added the sample code from wxPython In Action to the samples dir

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42925 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/samples/wxPIA_book/Chapter-15/tree_simple.py

@@ -0,0 +1,62 @@
+import wx
+import data
+
+class TestFrame(wx.Frame):
+    def __init__(self):
+        wx.Frame.__init__(self, None, title="simple tree", size=(400,500))
+
+        # Create the tree
+        self.tree = wx.TreeCtrl(self)
+
+        # Add a root node
+        root = self.tree.AddRoot("wx.Object")
+
+        # Add nodes from our data set
+        self.AddTreeNodes(root, data.tree)
+
+        # Bind some interesting events
+        self.Bind(wx.EVT_TREE_ITEM_EXPANDED, self.OnItemExpanded, self.tree)
+        self.Bind(wx.EVT_TREE_ITEM_COLLAPSED, self.OnItemCollapsed, self.tree)
+        self.Bind(wx.EVT_TREE_SEL_CHANGED, self.OnSelChanged, self.tree)
+        self.Bind(wx.EVT_TREE_ITEM_ACTIVATED, self.OnActivated, self.tree)
+
+        # Expand the first level
+        self.tree.Expand(root)
+
+
+    def AddTreeNodes(self, parentItem, items):
+        """
+        Recursively traverses the data structure, adding tree nodes to
+        match it.
+        """
+        for item in items:
+            if type(item) == str:
+                self.tree.AppendItem(parentItem, item)
+            else:
+                newItem = self.tree.AppendItem(parentItem, item[0])
+                self.AddTreeNodes(newItem, item[1])
+                
+    def GetItemText(self, item):
+        if item:
+            return self.tree.GetItemText(item)
+        else:
+            return ""
+        
+    def OnItemExpanded(self, evt):
+        print "OnItemExpanded: ", self.GetItemText(evt.GetItem())
+        
+    def OnItemCollapsed(self, evt):
+        print "OnItemCollapsed:", self.GetItemText(evt.GetItem())
+
+    def OnSelChanged(self, evt):
+        print "OnSelChanged:   ", self.GetItemText(evt.GetItem())
+
+    def OnActivated(self, evt):
+        print "OnActivated:    ", self.GetItemText(evt.GetItem())
+
+
+app = wx.PySimpleApp(redirect=True)
+frame = TestFrame()
+frame.Show()
+app.MainLoop()
+