Call operator with tweak popup window

Question

I'm making a panel with buttons to do different actions for modeling. One one of my button I want to merge vertex by distance when I click on it, but merge to center when I CTRL + Click.

I got this working just fine except that I would like my regular click to show the context panel that shows up when you call with from Vertex -> Merge Vertices -> By Distance where you can adjust the threshold and what not.

I mean this window:

I noticed that when I call the function with

row.operator("mesh.remove_doubles")

the context panel does show up, but when I call it inside invoke to get the event.CTRL it does not show up.

def invoke(self, context, event):
    if event.ctrl:
        bpy.ops.mesh.merge(type='CENTER')
    else:
        bpy.ops.mesh.remove_doubles()

    return {'FINISHED'}

Any way to run the same method in the invoke ? Thanks!

Answer 1

Ok so that's what ended up having that works the way I wanted

import bpy

class Weld(bpy.types.Operator):
    bl_idname = "edit.weld"
    bl_label = "Weld"
    bl_description = "Weld vertices by distance\nHold CTRL to weld at center"
    bl_options = {'REGISTER', 'UNDO'}

    merge_dist: bpy.props.FloatProperty(
        name="Merge Distance",
        description="Merge Distance",
        min=0.0,
        step=0.1,
        default=0.02
    )

    @classmethod
    def poll(cls, context):

        if context.active_object.mode != 'EDIT':
            return False        
        if len(context.selected_objects) < 1:
            return False

        return True

    def invoke(self, context, event):
        if event.ctrl:
            bpy.ops.mesh.merge(type='CENTER')
            return{'PASS_THROUGH'}
        else:
            return{'FINISHED'}

    def execute(self, context):
        bpy.ops.mesh.remove_doubles(threshold=self.merge_dist)
        return {'FINISHED'}