@m_magalhaes

This morning: uff more learning and work.
This Afternoon lets try this code ... mind blown ... thank you !

I'll mark this as solved hence I think ist a good way to close a thread with a working prototype for others to learn.

Thank You again, @zipit & @m_magalhaes
mogh

@mikeudin

In my case setting this to true hides them.

customgui.SetBool(c4d.TREEVIEW_HIDE_LINES, True) # True if no lines should be drawn.

kind regards
mogh

Beginner solution:
If you do not need a certain layer you could also implement the call comand "Delete unused layers"
Its not pretty but beats any convulated self written code if it is not called to often.

c4d.CallCommand(100004760) # Remove unused layers

cheers
mogh

... while the Team probalby will ask you to provide more context / detail ... have you looked at the sdk examples ?

https://github.com/PluginCafe/cinema4d_py_sdk_extended/tree/master/scripts/03_application_development/gui/dialog

kind regards

https://developers.maxon.net/docs/Cinema4DPythonSDK/html/modules/c4d/C4DAtom/GeListNode/BaseList2D/BaseObject/index.html#BaseObject.GetEditorMode

drag n drop the (red dot) into the (c4d) comandline would have get you on track

https://developers.maxon.net/docs/Cinema4DPythonSDK/html/classic_resource/base_list/obase.html

kind regards

... while the Team probalby will ask you to provide more context / detail ... have you looked at the sdk examples ?

https://github.com/PluginCafe/cinema4d_py_sdk_extended/tree/master/scripts/03_application_development/gui/dialog

kind regards

@a_block where is the PM system ? I can't find anything here in the forum ...

I did some rudimentary logging of just my slection + callcomand and I cannot see a "slow" execution. So @a_block might have a hunch that its the doc passing / filesize / undo accumulation ...

and what makes the "exponetial" feeling even more is that the engineers put screws (small stuff) at the bottom of the tree

I only import one file at a time ... so my file size shrinks because I "connect" objects ....

Sorted by time logged to console (145 MB , 3.965.783 polys, 547 calls on Callcomand)
<- not all calls

anyway its late fresh mind tomorrow

cheers mogh

Thanks @ferdinand for you explanation. I understand the problems and the unlikelihood of this idea.

On the topic anyway hence your recall my import data problem, Do you have an idea why huge imports are exponentially in behavior?
I have to log some statistics but my suspicion is that even tho the polycount per objects to connect is similar the more objects are in the doc the slower the callcomand is.

Could you take a peak at the code internally of Connect Objects + Delete ? or perhaps its the selection of objects ... anyway the behavior is from slow to fast as less objects to connect in the doc which feels weird ...

def select_children(mother, childrenlist):
    mother.SetBit(c4d.BIT_ACTIVE)
    for child in childrenlist:
        child.SetBit(c4d.BIT_ACTIVE)

c4d.CallCommand(16768, 16768) # Connect Objects + Delete

cheers mogh

Thank You @ferdinand

Access an Enclosing Entity from a Subordinate Entity, was the solution I was searching for hence I needed to alter the GeDialog from inside the TreeViewFunctions. This seems to be the only solution hence these checkboxes belong to the treeview ?!?

Anyway its working and I am very happy

User sets checkbox -> Sum is calculated -> button is activated.

I updated the example code (and removed the now unnecessary button to prevent further confusion) with the desired behavior for future readers.

kind regards
mogh

"""
Adapted from:
    https://plugincafe.maxon.net/topic/10654/14102_using-customgui-listview/2
"""
import c4d
import random
 
# Be sure to use a unique ID obtained from http://www.plugincafe.com/.
PLUGIN_ID = 1000010  # TEST ID ONLY
 
# TreeView Column IDs.
ID_CHECKBOX = 1
ID_NAME = 2
ID_OTHER = 3
ID_LONGFILENAME = 4
MY_BUTON = 5
HOW_MANY = 6
ID_FILESIZE = 7
HOW_MANY_MB = 8
MY_CALC = 9

TREEVIEW = 99

# A tuple of characters to select from (a-z).
CHARACTERS = tuple( chr ( n) for n in range(97, 122))


class TextureObject(object):
    """
    Class which represent a texture, aka an Item in our list
    """
    def __init__(self):
        self.texturePath = TextureObject.RandomString(5, 10)
        self.otherData = TextureObject.RandomString(5, 20)
        self.longfilename = "-"
        self._selected = False
        self.filesize = TextureObject.RandomNumber()

    @staticmethod
    def RandomString(minLength, maxLength):
        """Returns a string of random characters with a length between 
        #minLength and #maxLength.

        The characters are taken from the 97 (a) to 122 (z) ASCII range.
        """
        return "".join(
            (random.choice(CHARACTERS) for _ in range(minLength, maxLength)))

    @staticmethod
    def RandomNumber():
        return random.randrange(1, 99)

    @property
    def IsSelected(self):
        return self._selected
 
    def Select(self):
        self._selected = True
 
    def Deselect(self):
        self._selected = False

    def __repr__(self):
        return str(self)
 
    def __str__(self):
        return self.texturePath
 
 
class ListView(c4d.gui.TreeViewFunctions):
 
    def __init__(self, host):
        """Initializes a ListView with a host.

        Args:
            host (c4d.gui.GeDialog): The hosting dialog.
        """
        # Add ten mock data texture objects.
        self.listOfTexture = [TextureObject() for _ in range(10)]
        if not isinstance(host, c4d.gui.GeDialog):
            raise TypeError("Expected {} for argument 'host'. Received: {}".format(c4d.gui.GeDialog, host))
        else:
            self._host = host

    def DoSomethingWithDialog(self):
        """Calls the dialog over the stored reference.
        """
        self._host.calc_selected()

    def IsResizeColAllowed(self, root, userdata, lColID):
        return True
 
    def IsTristate(self, root, userdata):
        return False
 
    def GetColumnWidth(self, root, userdata, obj, col, area):
        """Measures the width of cells.

        Although this function is called #GetColumnWidth and has a #col, it is
        not only executed by column but by cell. So, when there is a column
        with items requiring the width 5, 10, and 15, then there is no need
        for evaluating all items. Each item can return its ideal width and
        Cinema 4D will then pick the largest value.

        Args:
            root (any): The root node of the tree view.
            userdata (any): The user data of the tree view.
            obj (any): The item for the current cell.
            col (int): The index of the column #obj is contained in.
            area (GeUserArea): An already initialized GeUserArea to measure
             the width of strings.
        
        Returns:
            TYPE: Description
        """
        # The default width of a column is 80 units.
        width = 80
        # Replace the width with the text width. area is a prepopulated
        # user area which has already setup all the font stuff, we can
        # measure right away.

        if col == ID_NAME:
            return area.DrawGetTextWidth(obj.texturePath) + 5
        if col == ID_OTHER:
            return area.DrawGetTextWidth(obj.otherData) + 5
        if col == ID_LONGFILENAME:
            return area.DrawGetTextWidth(obj.longfilename) + 5
            
        return width

    def IsMoveColAllowed(self, root, userdata, lColID):
        # The user is allowed to move all columns.
        # TREEVIEW_MOVE_COLUMN must be set in the container of AddCustomGui.
        return True
 
    def GetFirst(self, root, userdata):
        """
        Return the first element in the hierarchy, or None if there is no element.
        """
        rValue = None if not self.listOfTexture else self.listOfTexture[0]
        return rValue
 
    def GetDown(self, root, userdata, obj):
        """
        Return a child of a node, since we only want a list, we return None everytime
        """
        return None
 
    def GetNext(self, root, userdata, obj):
        """
        Returns the next Object to display after arg:'obj'
        """
        rValue = None
        currentObjIndex = self.listOfTexture.index(obj)
        nextIndex = currentObjIndex + 1
        if nextIndex < len(self.listOfTexture):
            rValue = self.listOfTexture[nextIndex]
 
        return rValue
 
    def GetPred(self, root, userdata, obj):
        """
        Returns the previous Object to display before arg:'obj'
        """
        rValue = None
        currentObjIndex = self.listOfTexture.index(obj)
        predIndex = currentObjIndex - 1
        if 0 <= predIndex < len(self.listOfTexture):
            rValue = self.listOfTexture[predIndex]
 
        return rValue
 
    def GetId(self, root, userdata, obj):
        """
        Return a unique ID for the element in the TreeView.
        """
        return hash(obj)
 
    def Select(self, root, userdata, obj, mode):
        """
        Called when the user selects an element.
        """
        # I only use the checkbox to select list elemenmts
        """
        if mode == c4d.SELECTION_NEW:
            for tex in self.listOfTexture:
                tex.Deselect()
            obj.Select()
        elif mode == c4d.SELECTION_ADD:
            obj.Select()
        elif mode == c4d.SELECTION_SUB:
            obj.Deselect()
        """

    def IsSelected(self, root, userdata, obj):
        """
        Returns: True if *obj* is selected, False if not.
        """
        return obj.IsSelected
 
    def SetCheck(self, root, userdata, obj, column, checked, msg):
        """
        Called when the user clicks on a checkbox for an object in a
        `c4d.LV_CHECKBOX` column.
        """
        if checked:
            obj.Select()
        else:
            obj.Deselect()

        self.DoSomethingWithDialog()

 
    def IsChecked(self, root, userdata, obj, column):
        """
        Returns: (int): Status of the checkbox in the specified *column* for *obj*.
        """
        if obj.IsSelected:
            return c4d.LV_CHECKBOX_CHECKED | c4d.LV_CHECKBOX_ENABLED
        else:
            return c4d.LV_CHECKBOX_ENABLED
 
    def GetName(self, root, userdata, obj):
        """
        Returns the name to display for arg:'obj', only called for column of type LV_TREE
        """
        return str(obj)  # Or obj.texturePath
 
    def DrawCell(self, root, userdata, obj, col, drawinfo, bgColor):
        """
        Draw into a Cell, only called for column of type LV_USER
        """
        if col in (ID_OTHER, ID_LONGFILENAME):
            text = obj.otherData if col == ID_OTHER else obj.longfilename
            canvas = drawinfo["frame"]
            textWidth = canvas.DrawGetTextWidth(text)
            textHeight = canvas.DrawGetFontHeight()
            xpos = drawinfo["xpos"]
            ypos = drawinfo["ypos"] + drawinfo["height"]

            if (drawinfo["width"] < textWidth):
                while (drawinfo["width"] < textWidth):
                    if len(text) <= 4:
                        text = "..."
                        break
                    text = text[:-4] + "..."
                    textWidth = canvas.DrawGetTextWidth(text)

            textWidth = canvas.DrawGetTextWidth(text)
            drawinfo["frame"].DrawText(text, xpos, ypos - int(textHeight * 1.1))

        if col == ID_FILESIZE:
            text = obj.filesize
            canvas = drawinfo["frame"]
            # w = geUserArea.DrawGetTextWidth(name)
            h = canvas.DrawGetFontHeight()
            # xpos = drawinfo["xpos"] + 10
            xpos = drawinfo["xpos"] + drawinfo["width"] - canvas.DrawGetTextWidth(text)
            ypos = drawinfo["ypos"] + drawinfo["height"]
            drawinfo["frame"].DrawText(text, xpos, ypos - int(h * 1.1))

    def DoubleClick(self, root, userdata, obj, col, mouseinfo):
        """
        Called when the user double-clicks on an entry in the TreeView.
 
        Returns:
          (bool): True if the double-click was handled, False if the
            default action should kick in. The default action will invoke
            the rename procedure for the object, causing `SetName()` to be
            called.
        """
        c4d.gui.MessageDialog("You clicked on " + str(obj))
        return True
 
    def DeletePressed(self, root, userdata):
        "Called when a delete event is received."
        for tex in reversed(self.listOfTexture):
            if tex.IsSelected:
                self.listOfTexture.remove(tex)


class TestDialog(c4d.gui.GeDialog):
    _treegui = None  # Our CustomGui TreeView
    # _listView = ListView()  # Our Instance of c4d.gui.TreeViewFunctions

    def __init__(self):
        """
        """
        # Create an instance of ListView and give it access to the dialog
        # which carries it.
        self._listView = ListView(host=self)
        self.overall = len(self._listView.listOfTexture)

    def CreateLayout(self):
        # Create the TreeView GUI.
        customgui = c4d.BaseContainer()
        customgui.SetBool(c4d.TREEVIEW_BORDER, c4d.BORDER_THIN_IN)
        customgui.SetBool(c4d.TREEVIEW_HAS_HEADER, True)  # True if the tree view may have a header line.
        customgui.SetBool(c4d.TREEVIEW_HIDE_LINES, True)  # True if no lines should be drawn.
        customgui.SetBool(c4d.TREEVIEW_MOVE_COLUMN, True)  # True if the user can move the columns.
        customgui.SetBool(c4d.TREEVIEW_RESIZE_HEADER, True)  # True if the column width can be changed by the user.
        customgui.SetBool(c4d.TREEVIEW_FIXED_LAYOUT, True)  # True if all lines have the same height.
        customgui.SetBool(c4d.TREEVIEW_ALTERNATE_BG, True)  # Alternate background per line.
        customgui.SetBool(c4d.TREEVIEW_CURSORKEYS, True)  # True if cursor keys should be processed.
        customgui.SetBool(c4d.TREEVIEW_NOENTERRENAME, False)  # Suppresses the rename popup when the user presses enter.

        if self.GroupBegin(id=1000, flags=c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT, rows=2, cols=1, groupflags=c4d.BORDER_OUT):
            self.GroupBorderSpace(left=5, top=5, right=5, bottom=5)
            self.GroupBorderNoTitle(borderstyle=c4d.BORDER_NONE)

            if self.GroupBegin(id=1001, flags=c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT, rows=2, cols=3, groupflags=c4d.BORDER_OUT):
                self.GroupBorderNoTitle(borderstyle=c4d.BORDER_NONE)
                self._treegui = self.AddCustomGui(TREEVIEW, c4d.CUSTOMGUI_TREEVIEW, "", c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT, minw=430, minh=160, customdata=customgui)
                if not self._treegui:
                    print("[ERROR]: Could not create TreeView")
                    return False
                self.GroupEnd()

            if self.GroupBegin(id=1002, flags=c4d.BFH_FIT | c4d.BFV_FIT, rows=2, cols=3, groupflags=c4d.BORDER_OUT):
                self.GroupBorderNoTitle(borderstyle=c4d.BORDER_NONE)

                self.AddStaticText(HOW_MANY, flags=c4d.BFV_CENTER | c4d.BFV_SCALE | c4d.BFH_LEFT | c4d.BFH_SCALE, name="Selected: 0 / " + str(self.overall))
                self.AddStaticText(HOW_MANY_MB, flags=c4d.BFV_CENTER | c4d.BFV_SCALE | c4d.BFH_LEFT | c4d.BFH_SCALE, name="Filesize Sum: __________")
                self.AddButton(MY_BUTON, c4d.BFH_CENTER, name="Enable me by check-boxing")
                self.Enable(MY_BUTON, False)
                self.GroupEnd()

            self.GroupEnd()

        return True

    def calc_selected(self):
        """this is a helper to calculate the selected elements and to enable the button

        :return: # slected and sum of the selecteed filsize
        """
        selected = 0
        filsizesum = 0
        self.overall = len(self._listView.listOfTexture)  # update our count

        for fileitem in self._listView.listOfTexture:
            if fileitem.IsSelected is True:
                filsizesum += fileitem.filesize
                selected += 1

        if selected > 0:
            self.Enable(MY_BUTON, True)
        else:
            self.Enable(MY_BUTON, False)

        sel_string = "Selected: " + str(selected) + " / " + str(self.overall)
        self.SetString(HOW_MANY, sel_string)

        mb_string = "Filesize Sum: " + str(filsizesum)
        self.SetString(HOW_MANY_MB, mb_string)

        return selected, filsizesum

    def InitValues(self):
        # Initialize the column layout for the TreeView.
        layout = c4d.BaseContainer()
        layout.SetLong(ID_CHECKBOX, c4d.LV_CHECKBOX)
        layout.SetLong(ID_NAME, c4d.LV_TREE)
        layout.SetLong(ID_LONGFILENAME, c4d.LV_USER)
        layout.SetLong(ID_OTHER, c4d.LV_USER)
        layout.SetLong(ID_FILESIZE, c4d.LV_USER)
        self._layout = layout
        self._treegui.SetLayout(5, layout)
 
        # Set the header titles.
        self._treegui.SetHeaderText(ID_CHECKBOX, "Check")
        self._treegui.SetHeaderText(ID_NAME, "Name")
        self._treegui.SetHeaderText(ID_LONGFILENAME, "Long Filename")
        self._treegui.SetHeaderText(ID_OTHER, "Other")
        self._treegui.SetHeaderText(ID_FILESIZE, "Filesize")

        self._treegui.Refresh()
 
        # Set TreeViewFunctions instance used by our CUSTOMGUI_TREEVIEW
        self._treegui.SetRoot(self._treegui, self._listView, None)

        return True
 
    def Command(self, id, msg):
        # Click on button
        if id == MY_BUTON:
            newID = int(len(self._listView.listOfTexture) + 1)
            tex = TextureObject()
            tex.texturePath = "Some new data " + str(newID)
            tex.longfilename = TextureObject.RandomString(20, 40)
            self._listView.listOfTexture.append(tex)
            self.calc_selected()
            self._treegui.Refresh()

        return True

 
class MenuCommand(c4d.plugins.CommandData):
    dialog = None
 
    def Execute(self, doc):
        if self.dialog is None:
            self.dialog = TestDialog()
        return self.dialog.Open(c4d.DLG_TYPE_ASYNC, PLUGIN_ID, defaulth=300, defaultw=430)
 
    def RestoreLayout(self, sec_ref):
        if self.dialog is None:
            self.dialog = TestDialog()
        return self.dialog.Restore(PLUGIN_ID, secret=sec_ref)
 
 
def main():
    c4d.plugins.RegisterCommandPlugin(
        PLUGIN_ID, "Python TreeView Example", 0, None, "Python TreeView Example", MenuCommand())


if __name__ == "__main__":
    main()

Dear SDK Team,

I would like to propose an idea for the c4d.CallComand()

I often call callcomand in my scripts on vast lists of objects in succession, which is not optimal. Therefore I would like to propose an optional Paramtere to pass a list to the callcomand to execute.

Similar to the utils.SendModelingCommand()

Why: Because the internal Callcomand is faster than any self programed solution in python only the overhead of reapeataly calling it hinders its full potential.

Things to be solved: What happens to a callcomand which already needs more than one object ... perhaps a list of lists ?

Hope I am not talking total nonsense here but I am as of right now already watching a 3 hour callcomand loop ... and it will probably take all day ... losing that overhead would shafe of more than minutes in my case ...

Yes I know I could learn C++ from zero and build a full solution but I think this is unrealistic in the short midterm.

kind regards
mogh

Beginner solution:
If you do not need a certain layer you could also implement the call comand "Delete unused layers"
Its not pretty but beats any convulated self written code if it is not called to often.

c4d.CallCommand(100004760) # Remove unused layers

cheers
mogh

Dear developers,

My topic seems a bit cryptic, but I am lacking the proper chargon to be more precise.

I have my TreeViewFunctions with a list of objects with values.
I want a button to activate and the sum selected and the sum of values of the object calculated outside the Treeview Gui hence I want to display it outside (my thinking might not be correct route to success) , when the user check marks an element.

I've read about the Python "super()" thing but could not implement anything remotely working in my case. I once read in the documentation about passing gui to parents but can't find its any more. Anyway I tried a lot ... I know this is a broad OOP question but hence its tied to the treeview I try my luck here anyway.

The use-case is:
Users selects elements -> display value on the fly -> let user interact (in my case import)

My Helper -> def calc_selected(self):

Thanks in advance.
Mogh

"""
Adapted from:
    https://plugincafe.maxon.net/topic/10654/14102_using-customgui-listview/2
"""
import c4d
import random
 
# Be sure to use a unique ID obtained from http://www.plugincafe.com/.
PLUGIN_ID = 1000010  # TEST ID ONLY
 
# TreeView Column IDs.
ID_CHECKBOX = 1
ID_NAME = 2
ID_OTHER = 3
ID_LONGFILENAME = 4
MY_BUTON = 5
HOW_MANY = 6
ID_FILESIZE = 7
HOW_MANY_MB = 8
MY_CALC = 9

TREEVIEW = 99

# A tuple of characters to select from (a-z).
CHARACTERS = tuple( chr ( n) for n in range(97, 122))


class TextureObject(object):
    """
    Class which represent a texture, aka an Item in our list
    """
    def __init__(self):
        self.texturePath = TextureObject.RandomString(5, 10)
        self.otherData = TextureObject.RandomString(5, 20)
        self.longfilename = "-"
        self._selected = False
        self.filesize = TextureObject.RandomNumber()

    @staticmethod
    def RandomString(minLength, maxLength):
        """Returns a string of random characters with a length between 
        #minLength and #maxLength.

        The characters are taken from the 97 (a) to 122 (z) ASCII range.
        """
        return "".join(
            (random.choice(CHARACTERS) for _ in range(minLength, maxLength)))

    @staticmethod
    def RandomNumber():
        return random.randrange(1, 99)

    @property
    def IsSelected(self):
        return self._selected
 
    def Select(self):
        self._selected = True
 
    def Deselect(self):
        self._selected = False

    def __repr__(self):
        return str(self)
 
    def __str__(self):
        return self.texturePath
 
 
class ListView(c4d.gui.TreeViewFunctions):
 
    def __init__(self):
        """
        """
        # Add ten mock data texture objects.
        self.listOfTexture = [TextureObject() for _ in range(10)]

    def IsResizeColAllowed(self, root, userdata, lColID):
        return True
 
    def IsTristate(self, root, userdata):
        return False
 
    def GetColumnWidth(self, root, userdata, obj, col, area):
        """Measures the width of cells.

        Although this function is called #GetColumnWidth and has a #col, it is
        not only executed by column but by cell. So, when there is a column
        with items requiring the width 5, 10, and 15, then there is no need
        for evaluating all items. Each item can return its ideal width and
        Cinema 4D will then pick the largest value.

        Args:
            root (any): The root node of the tree view.
            userdata (any): The user data of the tree view.
            obj (any): The item for the current cell.
            col (int): The index of the column #obj is contained in.
            area (GeUserArea): An already initialized GeUserArea to measure
             the width of strings.
        
        Returns:
            TYPE: Description
        """
        # The default width of a column is 80 units.
        width = 80
        # Replace the width with the text width. area is a prepopulated
        # user area which has already setup all the font stuff, we can
        # measure right away.

        if col == ID_NAME:
            return area.DrawGetTextWidth(obj.texturePath) + 5
        if col == ID_OTHER:
            return area.DrawGetTextWidth(obj.otherData) + 5
        if col == ID_LONGFILENAME:
            return area.DrawGetTextWidth(obj.longfilename) + 5
            
        return width

    def IsMoveColAllowed(self, root, userdata, lColID):
        # The user is allowed to move all columns.
        # TREEVIEW_MOVE_COLUMN must be set in the container of AddCustomGui.
        return True
 
    def GetFirst(self, root, userdata):
        """
        Return the first element in the hierarchy, or None if there is no element.
        """
        rValue = None if not self.listOfTexture else self.listOfTexture[0]
        return rValue
 
    def GetDown(self, root, userdata, obj):
        """
        Return a child of a node, since we only want a list, we return None everytime
        """
        return None
 
    def GetNext(self, root, userdata, obj):
        """
        Returns the next Object to display after arg:'obj'
        """
        rValue = None
        currentObjIndex = self.listOfTexture.index(obj)
        nextIndex = currentObjIndex + 1
        if nextIndex < len(self.listOfTexture):
            rValue = self.listOfTexture[nextIndex]
 
        return rValue
 
    def GetPred(self, root, userdata, obj):
        """
        Returns the previous Object to display before arg:'obj'
        """
        rValue = None
        currentObjIndex = self.listOfTexture.index(obj)
        predIndex = currentObjIndex - 1
        if 0 <= predIndex < len(self.listOfTexture):
            rValue = self.listOfTexture[predIndex]
 
        return rValue
 
    def GetId(self, root, userdata, obj):
        """
        Return a unique ID for the element in the TreeView.
        """
        return hash(obj)
 
    def Select(self, root, userdata, obj, mode):
        """
        Called when the user selects an element.
        """
        # I only use the checkbox to select list elemenmts
        """
        if mode == c4d.SELECTION_NEW:
            for tex in self.listOfTexture:
                tex.Deselect()
            obj.Select()
        elif mode == c4d.SELECTION_ADD:
            obj.Select()
        elif mode == c4d.SELECTION_SUB:
            obj.Deselect()
        """

    def IsSelected(self, root, userdata, obj):
        """
        Returns: True if *obj* is selected, False if not.
        """
        return obj.IsSelected
 
    def SetCheck(self, root, userdata, obj, column, checked, msg):
        """
        Called when the user clicks on a checkbox for an object in a
        `c4d.LV_CHECKBOX` column.
        """
        if checked:
            obj.Select()
        else:
            obj.Deselect()
 
    def IsChecked(self, root, userdata, obj, column):
        """
        Returns: (int): Status of the checkbox in the specified *column* for *obj*.
        """
        if obj.IsSelected:
            return c4d.LV_CHECKBOX_CHECKED | c4d.LV_CHECKBOX_ENABLED
        else:
            return c4d.LV_CHECKBOX_ENABLED
 
    def GetName(self, root, userdata, obj):
        """
        Returns the name to display for arg:'obj', only called for column of type LV_TREE
        """
        return str(obj)  # Or obj.texturePath
 
    def DrawCell(self, root, userdata, obj, col, drawinfo, bgColor):
        """
        Draw into a Cell, only called for column of type LV_USER
        """
        if col in (ID_OTHER, ID_LONGFILENAME):
            text = obj.otherData if col == ID_OTHER else obj.longfilename
            canvas = drawinfo["frame"]
            textWidth = canvas.DrawGetTextWidth(text)
            textHeight = canvas.DrawGetFontHeight()
            xpos = drawinfo["xpos"]
            ypos = drawinfo["ypos"] + drawinfo["height"]

            if (drawinfo["width"] < textWidth):
                while (drawinfo["width"] < textWidth):
                    if len(text) <= 4:
                        text = "..."
                        break
                    text = text[:-4] + "..."
                    textWidth = canvas.DrawGetTextWidth(text)

            textWidth = canvas.DrawGetTextWidth(text)
            drawinfo["frame"].DrawText(text, xpos, ypos - int(textHeight * 1.1))

        if col == ID_FILESIZE:
            text = obj.filesize
            canvas = drawinfo["frame"]
            # w = geUserArea.DrawGetTextWidth(name)
            h = canvas.DrawGetFontHeight()
            # xpos = drawinfo["xpos"] + 10
            xpos = drawinfo["xpos"] + drawinfo["width"] - canvas.DrawGetTextWidth(text)
            ypos = drawinfo["ypos"] + drawinfo["height"]
            drawinfo["frame"].DrawText(text, xpos, ypos - int(h * 1.1))

    def DoubleClick(self, root, userdata, obj, col, mouseinfo):
        """
        Called when the user double-clicks on an entry in the TreeView.
 
        Returns:
          (bool): True if the double-click was handled, False if the
            default action should kick in. The default action will invoke
            the rename procedure for the object, causing `SetName()` to be
            called.
        """
        c4d.gui.MessageDialog("You clicked on " + str(obj))
        return True
 
    def DeletePressed(self, root, userdata):
        "Called when a delete event is received."
        for tex in reversed(self.listOfTexture):
            if tex.IsSelected:
                self.listOfTexture.remove(tex)


class TestDialog(c4d.gui.GeDialog):
    _treegui = None  # Our CustomGui TreeView
    _listView = ListView()  # Our Instance of c4d.gui.TreeViewFunctions

    def __init__(self):
        self.overall = len(self._listView.listOfTexture)

    def CreateLayout(self):
        # Create the TreeView GUI.
        customgui = c4d.BaseContainer()
        customgui.SetBool(c4d.TREEVIEW_BORDER, c4d.BORDER_THIN_IN)
        customgui.SetBool(c4d.TREEVIEW_HAS_HEADER, True)  # True if the tree view may have a header line.
        customgui.SetBool(c4d.TREEVIEW_HIDE_LINES, True)  # True if no lines should be drawn.
        customgui.SetBool(c4d.TREEVIEW_MOVE_COLUMN, True)  # True if the user can move the columns.
        customgui.SetBool(c4d.TREEVIEW_RESIZE_HEADER, True)  # True if the column width can be changed by the user.
        customgui.SetBool(c4d.TREEVIEW_FIXED_LAYOUT, True)  # True if all lines have the same height.
        customgui.SetBool(c4d.TREEVIEW_ALTERNATE_BG, True)  # Alternate background per line.
        customgui.SetBool(c4d.TREEVIEW_CURSORKEYS, True)  # True if cursor keys should be processed.
        customgui.SetBool(c4d.TREEVIEW_NOENTERRENAME, False)  # Suppresses the rename popup when the user presses enter.

        if self.GroupBegin(id=1000, flags=c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT, rows=3, cols=1, groupflags=c4d.BORDER_OUT):
            self.GroupBorderSpace(left=5, top=5, right=5, bottom=5)
            self.GroupBorderNoTitle(borderstyle=c4d.BORDER_NONE)

            if self.GroupBegin(id=1001, flags=c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT, rows=2, cols=3, groupflags=c4d.BORDER_OUT):
                self.GroupBorderNoTitle(borderstyle=c4d.BORDER_NONE)
                self._treegui = self.AddCustomGui(TREEVIEW, c4d.CUSTOMGUI_TREEVIEW, "", c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT, minw=430, minh=160, customdata=customgui)
                if not self._treegui:
                    print("[ERROR]: Could not create TreeView")
                    return False
                self.GroupEnd()

            if self.GroupBegin(id=1002, flags=c4d.BFH_FIT | c4d.BFV_FIT, rows=2, cols=4, groupflags=c4d.BORDER_OUT):
                self.GroupBorderNoTitle(borderstyle=c4d.BORDER_NONE)

                self.AddStaticText(HOW_MANY, flags=c4d.BFV_CENTER | c4d.BFV_SCALE | c4d.BFH_LEFT | c4d.BFH_SCALE, name="Selected: 0 / " + str(self.overall))
                self.AddStaticText(HOW_MANY_MB, flags=c4d.BFV_CENTER | c4d.BFV_SCALE | c4d.BFH_LEFT | c4d.BFH_SCALE, name="Filesize Sum: ____")
                self.AddButton(MY_CALC, c4d.BFH_CENTER, name="Calc Manual")
                self.AddButton(MY_BUTON, c4d.BFH_CENTER, name="Enable me by check-boxing")
                self.Enable(MY_BUTON, False)
                self.GroupEnd()

            if self.GroupBegin(id=1002, flags=c4d.BFH_FIT | c4d.BFV_FIT, rows=2, cols=3, groupflags=c4d.BORDER_OUT):
                self.GroupBorderSpace(left=5, top=5, right=5, bottom=5)
                self.GroupBorderNoTitle(c4d.BORDER_ACTIVE_3)
                self.AddStaticText(1003, flags=c4d.BFV_CENTER | c4d.BFV_SCALE | c4d.BFH_CENTER | c4d.BFH_SCALE, name="How do I invoke action from inside the treegui class?")
                self.GroupEnd()
            self.GroupEnd()

        return True

    def calc_selected(self, autoactivate):
        """
        this is a helper to calculate the selected elements and to enable the button
        I do NOT know how to trigger this everytime a user clicks on a checkbox in the treegui class

        :return: # slected and sum of the selecteed filsize
        """
        selected = 0
        filsizesum = 0
        for fileitem in self._listView.listOfTexture:
            if fileitem.IsSelected is True:
                filsizesum += fileitem.filesize
                selected += 1

        if selected > 0 and autoactivate:
            self.Enable(MY_BUTON, True)

        sel_string = "Selected: " + str(selected) + " / " + str(self.overall)
        self.SetString(HOW_MANY, sel_string)

        mb_string = "Filesize Sum: " + str(filsizesum)
        self.SetString(HOW_MANY_MB, mb_string)

        return selected, filsizesum

    def InitValues(self):
        # Initialize the column layout for the TreeView.
        layout = c4d.BaseContainer()
        layout.SetLong(ID_CHECKBOX, c4d.LV_CHECKBOX)
        layout.SetLong(ID_NAME, c4d.LV_TREE)
        layout.SetLong(ID_LONGFILENAME, c4d.LV_USER)
        layout.SetLong(ID_OTHER, c4d.LV_USER)
        layout.SetLong(ID_FILESIZE, c4d.LV_USER)
        self._layout = layout
        self._treegui.SetLayout(5, layout)
 
        # Set the header titles.
        self._treegui.SetHeaderText(ID_CHECKBOX, "Check")
        self._treegui.SetHeaderText(ID_NAME, "Name")
        self._treegui.SetHeaderText(ID_LONGFILENAME, "Long Filename")
        self._treegui.SetHeaderText(ID_OTHER, "Other")
        self._treegui.SetHeaderText(ID_FILESIZE, "Filesize")

        self._treegui.Refresh()
 
        # Set TreeViewFunctions instance used by our CUSTOMGUI_TREEVIEW
        self._treegui.SetRoot(self._treegui, self._listView, None)

        return True
 
    def Command(self, id, msg):
        # Click on button
        if id == MY_BUTON:
            newID = int(len(self._listView.listOfTexture) + 1)
            tex = TextureObject()
            tex.texturePath = "Some new data " + str(newID)
            tex.longfilename = TextureObject.RandomString(20, 40)
            self._listView.listOfTexture.append(tex)
            self._treegui.Refresh()
 
        if id == MY_CALC:
            self.calc_selected(False)
            # print(self.calc_selected(False))

        return True

 
class MenuCommand(c4d.plugins.CommandData):
    dialog = None
 
    def Execute(self, doc):
        if self.dialog is None:
            self.dialog = TestDialog()
        return self.dialog.Open(c4d.DLG_TYPE_ASYNC, PLUGIN_ID, defaulth=300, defaultw=430)
 
    def RestoreLayout(self, sec_ref):
        if self.dialog is None:
            self.dialog = TestDialog()
        return self.dialog.Restore(PLUGIN_ID, secret=sec_ref)
 
 
def main():
    c4d.plugins.RegisterCommandPlugin(
        PLUGIN_ID, "Python TreeView Example", 0, None, "Python TreeView Example", MenuCommand())


if __name__ == "__main__":
    main()

Thanks ferdinand as allways you are the best.

I call this solved, the problems I encounter in my project are my own ... after cleaning my code - solving sorting ascending / descening will be next ...