Force user to select a special subobject (face, line, vertex)

[mariwan]

Have you ever used 3D Wings? There are some icons that let you easily avoid selecting wrong (face, line or vertex) when you click an object.
Please look at the picture. You can choose if you want to select an object, a face, a line or a vertex when you are clicking to the object.
I would like to have that in my workbench .. either if there is existing functionality or I have to think how I can achieve that.
I tried google I couldn't find an answer. I might be wrong but I need your help thanks.

[davidosterberg]

This is possible. For example, in PartDesign certain commands control what you can select by using a the ReferenceSelection class. Have a look at
src/Mod/PartDesign/Gui/ReferenceSelection.cpp.

[mariwan]

Could this class help me?

Code: Select all

 addSelectionGate(...)
        addSelectionGate(String|Filter|Gate, resolve=1) -- activate the selection gate.
        The selection gate will prohibit all selections which do not match
        the given selection filter string.
         Examples strings are:
        'SELECT Part::Feature SUBELEMENT Edge',
        'SELECT Robot::RobotObject'
        
        You can also set an instance of SelectionFilter:
        filter = Gui.Selection.Filter('SELECT Part::Feature SUBELEMENT Edge')
        Gui.Selection.addSelectionGate(filter)
        
        And the most flexible approach is to write your own selection gate class
        that implements the method 'allow'
        class Gate:
          def allow(self,doc,obj,sub):
            return (sub[0:4] == 'Face')
        Gui.Selection.addSelectionGate(Gate())

[mario52]

hi

see Macro_Select_Hovering this macro select a choice Face, Edge, Vertex hovering by the mouse.



mario

[freedman]

class SelObserver:
def addSelection(self,document, object, element, position):
try:
if element[0] == "E" or element[0] == "F" or element[0] == "V"

[0] is the first letter.Edge, Face, Vertex,

[mariwan]

hi
this macro select a choice Face, Edge, Vertex hovering by the mouse.
mario

HI Mario,
I tried your macro but it doesn't seems to work as it should.
I might be wrong but even with selecting one type, I could select the whole object, or something that wasn't chosen in the form.
Have you checked it using .19?

[jtm2020hyo]

In Blender this is called Selection Filters, this should be implemented in FreeCAD out the box

[freedman]

In my macros I get the selection/element and then do a "clearSelection, this keeps the main program from doing more highlights like it does with multiple selections of the same face, for instance. Once I'm done with the code I re-select the item. It's kind of a pain but you do get clean selections and single item selections. Also, if someone works on this you can get multiple call-backs to addSelection for one mouse click.

[mariwan]

In my macros I get the selection/element and then do a "clearSelection, this keeps the main program from doing more highlights like it does with multiple selections of the same face, for instance. Once I'm done with the code I re-select the item. It's kind of a pain but you do get clean selections and single item selections. Also, if someone works on this you can get multiple call-backs to addSelection for one mouse click.

Thanks for your input. This is the first time someone else confirm that remove-callback is not working well. If you try my workbench you will see that placing some of the Primitive objects causes problem for FreeCAD, or the callback is still functioning while I remove them.

[mario52]

hi

my macro work without click on mouse only fly over (survoler) the arrow on object for select wire, face or vertex (checkBox checked)

mario