UserInterface.workspacePreDeactivate 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 = []

# "userInterface_workspacePreDeactivate" is the event handler function.
futil.add_handler(userInterface_var.workspacePreDeactivate, userInterface_workspacePreDeactivate, local_handlers=local_handlers)

# Event handler for the workspacePreDeactivate event.
def userInterface_workspacePreDeactivate(args: adsk.core.WorkspaceEventArgs):

# Code to react to the event.
app.log('In userInterface_workspacePreDeactivate event handler.')

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

# Connect the handler to the event.
onWorkspacePreDeactivate = MyWorkspacePreDeactivateHandler()
userInterface_var.workspacePreDeactivate.add(onWorkspacePreDeactivate)
handlers.append(onWorkspacePreDeactivate)

# Event handler for the workspacePreDeactivate event.
class MyWorkspacePreDeactivateHandler(adsk.core.WorkspaceEventHandler):
    def __init__(self):
        super().__init__()
    def notify(self, args: adsk.core.WorkspaceEventArgs):
        # Code to react to the event.
        app.log('In MyWorkspacePreDeactivateHandler event handler.')

#include <Core/UserInterface/UserInterface.h>
#include <Core/UserInterface/WorkspaceEvent.h>
#include <Core/UserInterface/WorkspaceEventHandler.h>
#include <Core/UserInterface/WorkspaceEventArgs.h>

// Event handler for the workspacePreDeactivate event.
class MyWorkspacePreDeactivateEventHandler : public adsk::core::WorkspaceEventHandler {
public:
    void notify(const Ptr<WorkspaceEventArgs>& eventArgs) override {
        // Code to react to the event.
        ui->messageBox("In MyWorkspacePreDeactivateEventHandler event handler.");
    }
} _workspacePreDeactivate;

// "userInterface_var" is a variable referencing a UserInterface object.
// Connect the handler function to the event.
Ptr<WorkspaceEvent>workspacePreDeactivateEvent = userInterface_var->workspacePreDeactivate();
if (!workspacePreDeactivateEvent)
    return;

bool isOk = workspacePreDeactivateEvent->add(&_workspacePreDeactivate);
if (!isOk)
    return;

// Event handler for the workspacePreDeactivate event.
class MyWorkspacePreDeactivateHandler {
    notify(args: adsk.core.WorkspaceEventHandler): void {
        // Code to react to the event.
        app.log('In MyWorkspacePreDeactivateHandler event handler.')
    }
}

// Connect the handler to the event.
userInterface_var!.workspacePreDeactivate.add(new MyWorkspacePreDeactivateHandler());