create/src/Mod/Fem/femguiutils/post_visualization.py

# ***************************************************************************
# *   Copyright (c) 2025 Stefan Tröger <stefantroeger@gmx.net>              *
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# *   This file is part of the FreeCAD CAx development system.              *
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__title__ = "FreeCAD visualization registry"
__author__ = "Stefan Tröger"
__url__ = "https://www.freecad.org"

## @package post_visualization
#  \ingroup FEM
#  \brief A registry to collect visualizations for use in menus

# Note: This file is imported from FreeCAD App files. Do not import any FreeCADGui
#       directly to support cmd line use.

import copy
from dataclasses import dataclass

from PySide import QtCore

import FreeCAD


# Registry to handle visualization commands
# #########################################

_registry = {}

@dataclass
class _Extraction:

    name: str
    icon: str
    dimension: str
    extracttype: str
    module: str
    factory: str

@dataclass
class _Visualization:

    name: str
    icon: str
    module: str
    factory: str
    extractions: list[_Extraction]

# Register a visualization by type, icon and factory function
def register_visualization(visualization_type, icon, module, factory):
    if visualization_type in _registry:
        raise ValueError("Visualization type already registered")

    _registry[visualization_type] = _Visualization(visualization_type, icon, module, factory, [])

def register_extractor(visualization_type, extraction_type, icon, dimension, etype, module, factory):

    if not visualization_type in _registry:
        raise ValueError("visualization not registered yet")

    extraction = _Extraction(extraction_type, icon, dimension, etype, module, factory)
    _registry[visualization_type].extractions.append(extraction)

def get_registered_visualizations():
    return copy.deepcopy(_registry)


def _to_command_name(name):
    return "FEM_PostVisualization" + name

class _VisualizationGroupCommand:

    def GetCommands(self):
        visus = _registry.keys()
        cmds = [_to_command_name(v) for v in visus]
        return cmds

    def GetDefaultCommand(self):
        return 0

    def GetResources(self):
        return { 'MenuText': QtCore.QT_TRANSLATE_NOOP("FEM", 'Data Visualizations'),
                 'ToolTip': QtCore.QT_TRANSLATE_NOOP("FEM", 'Different visualizations to show post processing data in')}

    def IsActive(self):
        if not FreeCAD.ActiveDocument:
            return False

        import FemGui
        return bool(FemGui.getActiveAnalysis())


class _VisualizationCommand:

    def __init__(self, visualization_type):
        self._visualization_type = visualization_type

    def GetResources(self):

        cmd = _to_command_name(self._visualization_type)
        vis = _registry[self._visualization_type]
        tooltip = f"Create a {self._visualization_type} post processing data visualization"

        return {
                "Pixmap": vis.icon,
                "MenuText": QtCore.QT_TRANSLATE_NOOP(cmd, "Create {}".format(self._visualization_type)),
                "Accel": "",
                "ToolTip": QtCore.QT_TRANSLATE_NOOP(cmd, tooltip),
                "CmdType": "AlterDoc"
            }

    def IsActive(self):
        # active analysis available
        if not FreeCAD.ActiveDocument:
            return False

        import FemGui
        return bool(FemGui.getActiveAnalysis())

    def Activated(self):
        import FreeCADGui

        vis = _registry[self._visualization_type]
        FreeCAD.ActiveDocument.openTransaction(f"Create {vis.name}")

        FreeCADGui.addModule(vis.module)
        FreeCADGui.addModule("FemGui")

        FreeCADGui.doCommand(
            f"obj = {vis.module}.{vis.factory}(FreeCAD.ActiveDocument)"
        )
        FreeCADGui.doCommand(
            f"FemGui.getActiveAnalysis().addObject(obj)"
        )

        FreeCADGui.Selection.clearSelection()
        FreeCADGui.doCommand(
            "FreeCADGui.ActiveDocument.setEdit(obj)"
        )

def setup_commands(toplevel_name):
    # creates all visualization commands and registers them. The
    # toplevel group command will have the name provided to this function.

    import FreeCADGui

    # first all visualization and extraction commands
    for vis in _registry:
        FreeCADGui.addCommand(_to_command_name(vis), _VisualizationCommand(vis))

    # build the group command!
    FreeCADGui.addCommand("FEM_PostVisualization", _VisualizationGroupCommand())