Command.executePreview 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_executePreview" is the event handler function.
futil.add_handler(command_var.executePreview, command_executePreview, local_handlers=local_handlers)

# Event handler for the executePreview event.
def command_executePreview(args: adsk.core.CommandEventArgs):
    # Code to react to the event.
    app.log('In command_executePreview event handler.')

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

# "command_var" is a variable referencing a Command object.
# "MyExecutePreviewHandler" is the name of the class that handles the event.
onExecutePreview = MyExecutePreviewHandler()
command_var.executePreview.add(onExecutePreview)
handlers.append(onExecutePreview)

# Event handler for the executePreview event.
class MyExecutePreviewHandler(adsk.core.CommandEventHandler):
    def __init__(self):
        super().__init__()
    def notify(self, args: adsk.core.CommandEventArgs):
        # Code to react to the event.
        app.log('In MyExecutePreviewHandler event handler.')

#include <Core/UserInterface/Command.h>
#include <Core/UserInterface/CommandEvent.h>
#include <Core/UserInterface/CommandEventHandler.h>
#include <Core/UserInterface/CommandEventArgs.h>

// Event handler for the executePreview event.
class MyExecutePreviewEventHandler : public adsk::core::CommandEventHandler
{
public:
    void notify(const Ptr<CommandEventArgs>& eventArgs) override
    {
        // Code to react to the event.
        ui->messageBox("In MyExecutePreviewEventHandler event handler.");
    }
} _executePreview;

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

bool isOk = executePreviewEvent->add(&_executePreview);
if (!isOk)
    return;