261 lines
10 KiB
Python
261 lines
10 KiB
Python
# SPDX-License-Identifier: LGPL-2.1-or-later
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# ***************************************************************************
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# * Copyright (c) 2019 Zheng, Lei (realthunder)<realthunder.dev@gmail.com>*
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# * *
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# * This program is free software; you can redistribute it and/or modify *
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# * it under the terms of the GNU Lesser General Public License (LGPL) *
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# * as published by the Free Software Foundation; either version 2 of *
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# * the License, or (at your option) any later version. *
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# * for detail see the LICENCE text file. *
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# * *
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# * This program is distributed in the hope that it will be useful, *
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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# * GNU Library General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Library General Public *
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# * License along with this program; if not, write to the Free Software *
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# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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# * USA *
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# * *
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# ***************************************************************************
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"""Provides the base class for Link objects used by other objects.
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This class was created by realthunder during the `LinkMerge`
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to demonstrate how to use the `App::Link` objects to create
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Link aware arrays.
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It is used by `draftobject.array` (ortho, polar, circular)
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and `draftobject.patharray` to create respective Link arrays.
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NOTE: this class is a bit mysterious. We need more documentation
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on how the properties are being set, and how the code interacts with
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the arrays that use it.
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"""
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## @package draftlink
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# \ingroup draftobjects
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# \brief Provides the base class for Link objects used by other objects.
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import lazy_loader.lazy_loader as lz
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from PySide.QtCore import QT_TRANSLATE_NOOP
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import FreeCAD as App
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from draftutils import gui_utils
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from draftutils.messages import _log
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from draftobjects.base import DraftObject
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# Delay import of module until first use because it is heavy
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Part = lz.LazyLoader("Part", globals(), "Part")
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DraftGeomUtils = lz.LazyLoader("DraftGeomUtils", globals(), "DraftGeomUtils")
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## \addtogroup draftobjects
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# @{
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class DraftLink(DraftObject):
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"""New class to use the App::Link objects in arrays.
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Introduced by realthunder.
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This is subclassed by `draftobjects.array.Array`
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and by `draftobjects.patharray.PathArray`.
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"""
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def __init__(self, obj, tp):
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self.use_link = False if obj else True
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super().__init__(obj, tp)
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if obj:
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self.attach(obj)
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def dumps(self):
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"""Return a tuple of all serializable objects or None."""
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return self.__dict__
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def loads(self, state):
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"""Set some internal properties for all restored objects."""
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if isinstance(state, dict):
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self.__dict__ = state
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else:
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self.use_link = False
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super().loads(state)
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def attach(self, obj):
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"""Set up the properties when the object is attached."""
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if self.use_link:
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obj.addExtension("App::LinkExtensionPython")
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self.linkSetup(obj)
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def canLinkProperties(self, _obj):
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"""Link properties.
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TODO: add more explanation. Overrides a C++ method?
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"""
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return False
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def linkSetup(self, obj):
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"""Set up the link properties on attachment."""
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obj.configLinkProperty("Placement", LinkedObject="Base")
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if not hasattr(obj, "AlwaysSyncPlacement"):
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_tip = QT_TRANSLATE_NOOP(
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"App::Property",
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"Force sync pattern placements even when array elements are expanded",
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)
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obj.addProperty("App::PropertyBool", "AlwaysSyncPlacement", "Draft", _tip, locked=True)
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if hasattr(obj, "ShowElement"):
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# Rename 'ShowElement' property to 'ExpandArray' to avoid conflict
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# with native App::Link
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obj.configLinkProperty("ShowElement")
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showElement = obj.ShowElement
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_tip = QT_TRANSLATE_NOOP("App::Property", "Show the individual array elements")
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obj.addProperty("App::PropertyBool", "ExpandArray", "Draft", _tip, locked=True)
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obj.ExpandArray = showElement
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obj.configLinkProperty(ShowElement="ExpandArray")
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obj.removeProperty("ShowElement")
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else:
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obj.configLinkProperty(ShowElement="ExpandArray")
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if getattr(obj, "ExpandArray", False):
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obj.setPropertyStatus("PlacementList", "Immutable")
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else:
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obj.setPropertyStatus("PlacementList", "-Immutable")
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if not hasattr(obj, "LinkTransform"):
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obj.addProperty("App::PropertyBool", "LinkTransform", " Link", locked=True)
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if not hasattr(obj, "ColoredElements"):
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obj.addProperty("App::PropertyLinkSubHidden", "ColoredElements", " Link", locked=True)
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obj.setPropertyStatus("ColoredElements", "Hidden")
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if not hasattr(obj, "LinkCopyOnChange"):
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obj.addProperty("App::PropertyEnumeration", "LinkCopyOnChange", " Link", locked=True)
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obj.configLinkProperty("LinkCopyOnChange", "LinkTransform", "ColoredElements")
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if not getattr(obj, "Fuse", False):
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obj.setPropertyStatus("Shape", "Transient")
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def getViewProviderName(self, _obj):
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"""Override the view provider name."""
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if self.use_link:
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return "Gui::ViewProviderLinkPython"
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return ""
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def migrate_attributes(self, obj):
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"""Migrate old attribute names to new names if they exist.
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This is done to comply with Python guidelines or fix small issues
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in older code.
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"""
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if hasattr(self, "useLink"):
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# This is only needed for some models created in 0.19
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# while it was in development. Afterwards,
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# all models should use 'use_link' by default
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# and this won't be run.
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self.use_link = bool(self.useLink)
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_log("v0.19, {}, 'useLink' will be migrated to 'use_link'".format(obj.Name))
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del self.useLink
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def onDocumentRestored(self, obj):
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"""Execute code when the document in restored."""
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self.migrate_attributes(obj)
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if self.use_link:
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self.linkSetup(obj)
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else:
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obj.setPropertyStatus("Shape", "-Transient")
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if obj.Shape.isNull():
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if getattr(obj, "PlacementList", None):
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self.buildShape(obj, obj.Placement, obj.PlacementList)
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else:
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self.execute(obj)
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super().onDocumentRestored(obj)
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if hasattr(obj, "LinkTransform"):
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gui_utils.restore_view_object(
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obj, vp_module="view_draftlink", vp_class="ViewProviderDraftLink", format=False
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)
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else:
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gui_utils.restore_view_object(
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obj, vp_module="view_array", vp_class="ViewProviderDraftArray"
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)
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def buildShape(self, obj, pl, pls):
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"""Build the shape of the link object."""
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if self.use_link:
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if not getattr(obj, "ExpandArray", False) or obj.Count != len(pls):
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obj.setPropertyStatus("PlacementList", "-Immutable")
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obj.PlacementList = pls
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obj.setPropertyStatus("PlacementList", "Immutable")
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obj.Count = len(pls)
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if getattr(obj, "ExpandArray", False) and getattr(obj, "AlwaysSyncPlacement", False):
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for pla, child in zip(pls, obj.ElementList):
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child.Placement = pla
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else:
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obj.PlacementList = pls
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if obj.Count != len(pls):
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obj.Count = len(pls)
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if obj.Base:
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shape = getattr(obj.Base, "Shape", None)
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if not isinstance(shape, Part.Shape):
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obj.Shape = Part.Shape()
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elif shape.isNull():
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_err_msg = "'{}' cannot build shape " "from '{}'\n".format(
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obj.Label, obj.Base.Label
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)
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raise RuntimeError(_err_msg)
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else:
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# Resetting the Placement of the copied shape does not work for
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# Part_Vertex and Draft_Point objects, we need to transform:
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place = shape.Placement
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shape = shape.copy()
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shape.transformShape(place.Matrix.inverse())
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base = []
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for i, pla in enumerate(pls):
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vis = getattr(obj, "VisibilityList", [])
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if len(vis) > i and not vis[i]:
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continue
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base.append(shape.transformed(pla.toMatrix()))
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if getattr(obj, "Fuse", False) and len(base) > 1:
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obj.Shape = base[0].multiFuse(base[1:]).removeSplitter()
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else:
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obj.Shape = Part.makeCompound(base)
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if not DraftGeomUtils.isNull(pl):
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obj.Placement = pl
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if self.use_link:
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return False # return False to call LinkExtension::execute()
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def onChanged(self, obj, prop):
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"""Execute when a property changes."""
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self.props_changed_store(prop)
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if not getattr(self, "use_link", False):
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return
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if prop == "Fuse":
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if obj.Fuse:
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obj.setPropertyStatus("Shape", "-Transient")
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else:
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obj.setPropertyStatus("Shape", "Transient")
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elif prop == "ExpandArray":
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if hasattr(obj, "PlacementList"):
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if obj.ExpandArray:
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obj.setPropertyStatus("PlacementList", "-Immutable")
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else:
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obj.setPropertyStatus("PlacementList", "Immutable")
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# Alias for compatibility with old versions of v0.19
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_DraftLink = DraftLink
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## @}
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