Python Treeview Example

Shows how to make a generic layer item and use that to create the tree structure, maintain selection and item state. It also shows some state flags for color, folding and setting the child type to an attribute.

Place this into the lxserv folder in your scripts directory or your Kit and open the WhiskyTree view from the top right Viewport Widget menu.

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Tree (C++ Headers)

Treeview

# !/usr/bin/env python
 
import lx
import lxifc
 
SERVERNAME = 'WhiskyTreeView'
 
# --------------------------------------------------------------------------------------------------
# Node styles
# --------------------------------------------------------------------------------------------------
 
fTREE_VIEW_ITEM_ATTR =               0x00000001
fTREE_VIEW_ITEM_EXPAND =             0x00000002
fTREE_VIEW_ATTR_EXPAND =             0x00000004
fTREE_VIEW_ROWCOLOR_ORANGE =	     0x00050000
fTREE_VIEW_ROWCOLOR_RED =		     0x00010000
 
# --------------------------------------------------------------------------------------------------
# Generic layer node object that represents each entry in the tree
# --------------------------------------------------------------------------------------------------
 
class TreeNode(object):
 
    _Primary = None
 
    def __init__(self, name, price=-1.0, parent=None):
        self.m_name = name
        self.m_price = price
        self.m_parent = parent
        self.m_children = []
        self.state = 0
        self.selected = False
 
        self.columns = (("Whisky", -1),
                        ("Price", 90))
 
        self.toolTips = {}
 
    def AddNode(self, name, price=-1.0):
        self.m_children.append( TreeNode(name, price, self) )
        return self.m_children[-1]
 
    def ClearSelection(self):
 
        if self._Primary:
            self.setPrimary()
 
        self.SetSelected(False)
 
        for child in self.m_children:
            child.ClearSelection()
 
    def SetSelected(self,val=True):
 
        if val:
            self.setPrimary(self)        
        self.selected = val
 
    def isSelected(self):
        return self.selected
 
    @classmethod
    def setPrimary(cls,primary=None):
        cls._Primary = primary
 
    @classmethod
    def getPrimary(cls):
        return cls._Primary
 
    def setState(self,flag):
        self.state = self.state | flag
 
    def setToolTip(self,idx,tip):
        self.toolTips[idx] = tip
 
    def getToolTip(self,idx):
        if self.toolTips.has_key(idx):
            return self.toolTips[idx]
 
 
# --------------------------------------------------------------------------------------------------
# Build the structure
# --------------------------------------------------------------------------------------------------
 
_theTree = TreeNode('Whisky')
 
spey = _theTree.AddNode('Speyside')
spey.AddNode("Aberlour", 33.0)
spey.AddNode("Balvenie", 47.0)
spey.AddNode("Glenfiddich", 42.0)
spey.AddNode("Singleton", 48.0)
tom = spey.AddNode("Tomintoul 27yr", 115.99)
tom.setToolTip(0,"yummmmmmmm!")
 
# expand the first node
spey.setState(fTREE_VIEW_ITEM_EXPAND)
 
isle = _theTree.AddNode("Islands")
Talisker = isle.AddNode("Talisker", 37.0)
 
# make Talisker an attribute of isle
Talisker.setState(fTREE_VIEW_ITEM_ATTR | fTREE_VIEW_ROWCOLOR_RED)
 
jura = isle.AddNode("Jura")
jura.AddNode("Origin", 34.0)
jura.AddNode("Superstition", 31.0)
 
islay = _theTree.AddNode("Islay")
islay.AddNode("Lagavulin", 80.0)
Coal = islay.AddNode("Coal Ila Managers Choice", 465.0)
Coal.setToolTip(1,"How much!?!?!")
 
eng = _theTree.AddNode("English")
eng.AddNode("Nothing Worth Drinking")
eng.setState(fTREE_VIEW_ROWCOLOR_ORANGE)
 
# --------------------------------------------------------------------------------------------------
# Tree View
# --------------------------------------------------------------------------------------------------
 
class WhiskyTreeView(lxifc.TreeView,
                    lxifc.Tree,
                    lxifc.ListenerPort,
                    lxifc.Attributes):
 
    # Gloabal list of all created tree views.
    # These are used for shape and attribute changes
    _listenerClients = {}
 
    def __init__(self, node = None, curIndex = 0):
 
        if node is None:
            node = _theTree
 
        self.m_currentNode = node
        self.m_currentIndex = curIndex
 
    # --------------------------------------------------------------------------------------------------
    # Listener port
    # --------------------------------------------------------------------------------------------------
 
    @classmethod
    def addListenerClient(cls,listener):
        """
            Whenever a new tree view is created, we will add
            a copy of its listener so that it can be notified
            of attribute or shape changes
        """
        treeListenerObj = lx.object.TreeListener(listener)
        cls._listenerClients[treeListenerObj.__peekobj__()] = treeListenerObj
 
    @classmethod
    def removeListenerClient(cls,listener):
        """
            When a view is destroyed, it will be removed from
            the list of clients that need notification.
        """
        treeListenerObject = lx.object.TreeListener(listener)
        if cls._listenerClients.has_key(treeListenerObject.__peekobj__()):
            del  cls._listenerClients[treeListenerObject.__peekobj__()]
 
    @classmethod
    def notify_NewShape(cls):
        for client in cls._listenerClients.values():
            if client.test():
                client.NewShape()
 
    @classmethod
    def notify_NewAttributes(cls):
        for client in cls._listenerClients.values():
            if client.test():
                client.NewAttributes()
 
    #---  --------------------------------------------------------------------
 
    def lport_AddListener(self,obj):
        """
            Called from core code with the object that wants to
            bind to the listener port
        """
        self.addListenerClient(obj)
 
    def lport_RemoveListener(self,obj):
        """
            Called from core when a listener needs to be removed from
            the port.
        """
        self.removeListenerClient(obj)
 
    # --------------------------------------------------------------------------------------------------
    # Target layer in the tree
    # --------------------------------------------------------------------------------------------------
 
    def targetNode(self):
        """
            Returns the targeted layer node in the current tier
        """
        return self.m_currentNode.m_children[ self.m_currentIndex ]
 
    # --------------------------------------------------------------------------------------------------
    # Each time the tree is spawned, we create a copy of ourselves at current
    # location in the tree and return it
    # --------------------------------------------------------------------------------------------------
 
    def tree_Spawn(self, mode):
        """
            Spawn a new instance of this tier in the tree.
        """
 
        # create an instance of our current location in the tree
        newTree = WhiskyTreeView(self.m_currentNode,self.m_currentIndex)
 
        # Convert to a tree interface
        newTreeObj = lx.object.Tree(newTree)
 
        if mode == lx.symbol.iTREE_PARENT:
            # move the tree to the parent tier
            newTreeObj.ToParent()
 
        elif mode == lx.symbol.iTREE_CHILD:
            # move tree to child tier
            newTreeObj.ToChild()
 
        elif mode == lx.symbol.iTREE_ROOT:
            #move tree to root tier
            newTreeObj.ToRoot()
 
        return newTreeObj
 
    def tree_ToParent(self):
        """
            Step up to the parent tier and set the selection in this
            tier to the current items index
        """
        m_parent = self.m_currentNode.m_parent
 
        if m_parent:
            self.m_currentIndex = m_parent.m_children.index(self.m_currentNode)
            self.m_currentNode = m_parent
 
    def tree_ToChild(self):
        """
            Move to the child tier and set the selected node
        """
        self.m_currentNode = self.m_currentNode.m_children[self.m_currentIndex]
 
    def tree_ToRoot(self):
        """
            Move back to the root tier of the tree
        """
        self.m_currentNode = _theTree
 
    def tree_IsRoot(self):
        """
            Check if the current tier in the tree is the root tier
        """
        if self.m_currentNode == _theTree:
            return True
        else:
            return False
 
    def tree_ChildIsLeaf(self):
        """
            If the current tier has no children then it is
            considered a leaf
        """
        if len( self.m_currentNode.m_children ) > 0:
            return False
        else:
            return True
 
    def tree_Count(self):
        """
            Returns the number of nodes in this tier of
            the tree
        """
        return len( self.m_currentNode.m_children )
 
    def tree_Current(self):
        """
            Returns the index of the currently targeted item in
            this tier
        """
        return self.m_currentIndex
 
    def tree_SetCurrent(self, index):
        """
            Sets the index of the item to target in this tier
        """
        self.m_currentIndex = index
 
    def tree_ItemState(self, guid):
        """
            Returns the item flags that define the state.
 
        """
        return self.targetNode().state
 
    def tree_SetItemState(self, guid, state):
        """
            Set the item flags that define the state.
 
        """
        self.targetNode().state = state
 
 
    # --------------------------------------------------------------------------------------------------
    # Tree view
    # --------------------------------------------------------------------------------------------------
 
    def treeview_StoreState(self, uid):
        lx.notimpl()
 
    def treeview_RestoreState(self, uid):
        lx.notimpl()
 
    def treeview_ColumnCount(self):
        return len(_theTree.columns)
 
    def treeview_ColumnByIndex(self, columnIndex):
        return _theTree.columns[columnIndex]
 
    def treeview_ToPrimary(self):
        """
            Move the tree to the primary selection
        """
        if self.m_currentNode._Primary:
            self.m_currentNode = self.m_currentNode._Primary
            self.tree_ToParent()
            return True
        return False
 
    def treeview_IsSelected(self):
        return self.targetNode().isSelected()
 
    def treeview_Select(self, mode):
 
        if mode == lx.symbol.iTREEVIEW_SELECT_PRIMARY:
            _theTree.ClearSelection()
            self.targetNode().SetSelected()
 
        elif mode == lx.symbol.iTREEVIEW_SELECT_ADD:
            self.targetNode().SetSelected()
 
        elif mode == lx.symbol.iTREEVIEW_SELECT_REMOVE:
            self.targetNode().SetSelected(False)
 
        elif mode == lx.symbol.iTREEVIEW_SELECT_CLEAR:
            _theTree.ClearSelection()
 
    def treeview_CellCommand(self, columnIndex):
        lx.notimpl()
 
    def treeview_BatchCommand(self, columnIndex):
        lx.notimpl()
 
    def treeview_ToolTip(self, columnIndex):
        toolTip = self.targetNode().getToolTip(columnIndex)
        if toolTip:
            return toolTip
        lx.notimpl()
 
    def treeview_BadgeType(self, columnIndex, badgeIndex):
        lx.notimpl()
 
    def treeview_BadgeDetail(self, columnIndex, badgeIndex, badgeDetail):
        lx.notimpl()
 
    def treeview_IsInputRegion(self, columnIndex, regionID):
        lx.notimpl()
 
    def treeview_SupportedDragDropSourceTypes(self, columnIndex):
        lx.notimpl()
 
    def treeview_GetDragDropSourceObject(self, columnIndex, type):
        lx.notimpl()
 
    def treeview_GetDragDropDestinationObject(self, columnIndex, location):
        lx.notimpl()
 
    # --------------------------------------------------------------------------------------------------
    # Attributes
    # --------------------------------------------------------------------------------------------------
 
    def attr_Count(self):
        return len(_theTree.columns)
 
    def attr_GetString(self, index):
        node = self.targetNode()
 
        if index == 0:
            return node.m_name
        elif node.m_price > 0.0:
            return "%.2f" % node.m_price
        else:
            return ""
 
 
tags = {lx.symbol.sSRV_USERNAME:  "whiskytreeview",
        lx.symbol.sTREEVIEW_TYPE: "vpapplication WSTV whiskytreeview WhiskyTree"}
 
lx.bless(WhiskyTreeView, SERVERNAME, tags)