from direct.showbase.PandaObject import *
from direct.showbase.TkGlobal import *
from Tree import *

# changing these strings requires changing DirectSession.py SGE_ strs too!
DEFAULT_MENU_ITEMS = [
    'Update Explorer',
    'Separator',
    'Select', 'Deselect', 
    'Separator',
    'Delete',
    'Separator',
    'Fit', 'Flash', 'Isolate', 'Toggle Vis', 'Show All',
    'Separator',
    'Set Reparent Target', 'Reparent', 'WRT Reparent',
    'Separator',
    'Place', 'Set Name', 'Set Color', 'Explore',
    'Separator']

class SceneGraphExplorer(Pmw.MegaWidget, PandaObject):
    "Graphical display of a scene graph"
    def __init__(self, parent = None, nodePath = render, **kw):
        # Define the megawidget options.
        optiondefs = (
            ('menuItems',   [],   Pmw.INITOPT),
            )
        self.defineoptions(kw, optiondefs)
 
        # Initialise superclass
        Pmw.MegaWidget.__init__(self, parent)
        
        # Initialize some class variables
        self.nodePath = nodePath

        # Create the components.
        
        # Setup up container
        interior = self.interior()
        interior.configure(relief = GROOVE, borderwidth = 2)
        
        # Create a label and an entry
        self._scrolledCanvas = self.createcomponent(
            'scrolledCanvas',
            (), None,
            Pmw.ScrolledCanvas, (interior,),
            hull_width = 200, hull_height = 300,
            usehullsize = 1)
        self._canvas = self._scrolledCanvas.component('canvas')
        self._canvas['scrollregion'] = ('0i', '0i', '2i', '4i')
        self._scrolledCanvas.resizescrollregion()
        self._scrolledCanvas.pack(padx = 3, pady = 3, expand=1, fill = BOTH)
        
        self._canvas.bind('<ButtonPress-2>', self.mouse2Down)
        self._canvas.bind('<B2-Motion>', self.mouse2Motion)
        self._canvas.bind('<Configure>',
                          lambda e, sc = self._scrolledCanvas:
                          sc.resizescrollregion())
        self.interior().bind('<Destroy>', self.onDestroy)
        
        # Create the contents
        self._treeItem = SceneGraphExplorerItem(self.nodePath)

        self._node = TreeNode(self._canvas, None, self._treeItem,
                              DEFAULT_MENU_ITEMS + self['menuItems'])
        self._node.expand()

        self._parentFrame = Frame(interior)
        self._label = self.createcomponent(
            'parentLabel',
            (), None,
            Label, (interior,),
            text = 'Active Reparent Target: ',
            anchor = W, justify = LEFT)
        self._label.pack(fill = X)

        # Add update parent label
        def updateLabel(nodePath = None, s = self):
            s._label['text'] = 'Active Reparent Target: ' + nodePath.getName()
        self.accept('DIRECT_activeParent', updateLabel)

        # Add update hook
        self.accept('SGE_Update Explorer',
                    lambda np, s = self: s.update())

        # Check keywords and initialise options based on input values.
        self.initialiseoptions(SceneGraphExplorer)

    def update(self, fUseCachedChildren = 1):
        """ Refresh scene graph explorer """
        self._node.update(fUseCachedChildren)

    def mouse2Down(self, event):
        self._width = 1.0 * self._canvas.winfo_width()
        self._height = 1.0 * self._canvas.winfo_height()
        xview = self._canvas.xview()
        yview = self._canvas.yview()        
        self._left = xview[0]
        self._top = yview[0]
        self._dxview = xview[1] - xview[0]
        self._dyview = yview[1] - yview[0]
        self._2lx = event.x
        self._2ly = event.y

    def mouse2Motion(self,event):
        newx = self._left - ((event.x - self._2lx)/self._width) * self._dxview
        self._canvas.xview_moveto(newx)
        newy = self._top - ((event.y - self._2ly)/self._height) * self._dyview
        self._canvas.yview_moveto(newy)
        self._2lx = event.x
        self._2ly = event.y
        self._left = self._canvas.xview()[0]
        self._top = self._canvas.yview()[0]

    def onDestroy(self, event):
        # Remove hooks
        self.ignore('DIRECT_activeParent')
        self.ignore('SGE_Update Explorer')

class SceneGraphExplorerItem(TreeItem):

    """Example TreeItem subclass -- browse the file system."""

    def __init__(self, nodePath):
        self.nodePath = nodePath

    def GetText(self):
        type = self.nodePath.node().getType().getName()
        name = self.nodePath.getName()
        return type + "  " + name

    def GetKey(self):
        return self.nodePath.id()

    def IsEditable(self):
        # All nodes' names can be edited nowadays.
        return 1
        #return issubclass(self.nodePath.node().__class__, NamedNode)

    def SetText(self, text):
        try:
            self.nodePath.setName(text)
        except AttributeError:
            pass

    def GetIconName(self):
        return "sphere2" # XXX wish there was a "file" icon

    def IsExpandable(self):
        return self.nodePath.getNumChildren() != 0

    def GetSubList(self):
        sublist = []
        for nodePath in self.nodePath.getChildrenAsList():
            item = SceneGraphExplorerItem(nodePath)
            sublist.append(item)
        return sublist

    def OnSelect(self):
        messenger.send('SGE_Flash', [self.nodePath])

    def MenuCommand(self, command):
        messenger.send('SGE_' + command, [self.nodePath])


def explore(nodePath = render):
    tl = Toplevel()
    tl.title('Explore: ' + nodePath.getName())
    sge = SceneGraphExplorer(parent = tl, nodePath = nodePath)
    sge.pack(expand = 1, fill = 'both')
    return sge
