These features, based on the code for the Pipe class, allow the user
to simply create a helical sweep within PartDesign workbench.
Sample application is threads, springs, coils, augers, etc.
Also, remove needless requirement for positive cone angle on helixes.
Thanks to @bitacovir for helping with the icons
Thanks to @chennes for review
Thanks to @vosk for review
Thanks to @wwmayer for review
Enforce that links stay within scope for ProfileBased features
This also ensures that the Body itself is not used for creating features within
the body, causing a "Graph not a DAG" error.
DocumentObject:
* getSubObject(): the most important API for Link to work with
hierarchies. The function is a inspired from and replaces the
getPySubObjects(). It returns a child object following a dot separated
subname reference, and can optionally return accumulated
transformation, and/or a python object of the refered
sub-object/element. The default implementation here is to look for
link type property, and search for the referenced object. This patch also
include other specialized implementation of this API, such as
(GeoFeature)GroupExtension (through extensionGetSubObject()),
PartDesign::Body, and so on. A link type object is expected to
call the linked object's getSubObject() for resolving.
* getSubObjectList(): helper function to return a list of object
referenced in the given subname.
* getSubObjects(): return a list of subname references of all children
objects. The purpose of this function is similar to
ViewProvider::claimChildren(). Container type object is expected to
implement this function. The reason it returns subname references
instead of just object is to allow the container to skip hierarchies.
For example, the Assembly3 container uses this to skip the constraint
and element group.
* getLinkedObject(), obtain the linked object, and optionally with the
accumulated transformation. It is expected to return a linked object
or the object itself if it is not a link. In case there are multiple
levels of linking involved, this function allows the caller to retrieve
the linked object recursively.
* hasChildElement(), set/isElementVisible(), controls the children
visibility for a group type object. Because the child object may be
claimed by other objects, it is essential to have independent control
of children visibilities. These APIs are designed to abstract how
group manages the child visibility. For performance reason, these
function are meant to control only the immediate child object.
* resolve(), helper function to parse subname reference and resolve the
final object, and optionally the immediate parent of the final object,
the final object reference name (for calling `set/isElementVisible()`),
and the subname reference if there is one.
* touch(), add optional argument 'noRecompute' for better backward
compatibility with the NoRecompute flag. By default, touch() causes
recompute unless noRecompute is true
* signalChanged/signalBeforeChange, two new signal for tracking changes
of a specific object.
* getViewProviderNameOverride(), return a string of the view provider
type of this object. This allows Python class to override the view
provider of an object. This feature will be used by ViewProviderLink
which is designed to work with any object that has LinkBaseExtension.
* canLinkProperties(), will be used by Gui::PropertyView to display
linked object properties together with the object's own properties.
* redirectSubname(), will be used by Gui::Tree to allow an object to
redirect selection to some other object when (pre)selected in the tree
view.
* Visibility, new property serve as the same purpose as view provider
property of the same name. It is added here so that App namespace
code can check for visibility without Gui module. This is useful,
for example, when constructing a compound shape of a container that
respects the children visibility.
* (has)hasHiddenMarker(), return or check for a special sub-element
name used as marker for overriding sub-object visibility. Will be
used by Gui::ViewProvider, it is put here for the same reason as
adding Visibility property.
* getID(), return object internal identifier. Each object is now
assigned an integer identifier that is unique within its containing
document.
Document:
* ShowHidden, new property to tell tree view whether to show hidden
object items.
* signalTouchedObject, new signal triggered when manually touch an
object when calling its touch() function
* getObjectByID(), get object by its identifier
* addObject() is modified to allow overriding view provider
* has/getLinksTo(), helper function to obtain links to a given object.
Application:
* checkLinkDepth(), helper function to check recursive depth for link
traversal. The depth is checked against the total object count of
all opened documents. The count (_objCount) is internally updated
whenever object is added or removed.
* has/getLinksTo(), same as Document::has/getLinksTo() but return links
from all opened documents.
GroupExtension/OriginGroupExtension/DatumFeature/DatumCS/Part::Feature:
implement sepcialized getSubObject/getSubObjects().
