Command.selectionEvent Event

# Import fusion360utils folder, which includes event_utils.py.
from ...lib import fusion360utils as futil

# Global variable used to maintain a reference to all event handlers.
local_handlers = []

# "command_var" is a variable referencing a Command object.
# "command_selectionEvent" is the event handler function.
futil.add_handler(command_var.selectionEvent, command_selectionEvent, local_handlers=local_handlers)

# Event handler for the selectionEvent event.
def command_selectionEvent(args: adsk.core.SelectionEventArgs):
    # Code to react to the event.
    app.log('In command_selectionEvent event handler.')

# Global variable used to maintain a reference to all event handlers.
handlers = []

# "command_var" is a variable referencing a Command object.
# "MySelectionEventHandler" is the name of the class that handles the event.
onSelectionEvent = MySelectionEventHandler()
command_var.selectionEvent.add(onSelectionEvent)
handlers.append(onSelectionEvent)

# Event handler for the selectionEvent event.
class MySelectionEventHandler(adsk.core.SelectionEventHandler):
    def __init__(self):
        super().__init__()
    def notify(self, args: adsk.core.SelectionEventArgs):
        # Code to react to the event.
        app.log('In MySelectionEventHandler event handler.')

#include <Core/UserInterface/Command.h>
#include <Core/UserInterface/SelectionEvent.h>
#include <Core/UserInterface/SelectionEventHandler.h>
#include <Core/UserInterface/SelectionEventArgs.h>

// Event handler for the selectionEvent event.
class MySelectionEventEventHandler : public adsk::core::SelectionEventHandler
{
public:
    void notify(const Ptr<SelectionEventArgs>& eventArgs) override
    {
        // Code to react to the event.
        ui->messageBox("In MySelectionEventEventHandler event handler.");
    }
} _selectionEvent;

// "command_var" is a variable referencing a Command object.
// Connect the handler function to the event.
Ptr<SelectionEvent> selectionEventEvent = command_var->selectionEvent();
if (!selectionEventEvent)
    return;

bool isOk = selectionEventEvent->add(&_selectionEvent);
if (!isOk)
    return;