5.2.2 Event Handling

To make the testing somewhat easier we will add a way to terminate the application by responding to the ESC key. Add the following private method to our class in `simple.h':

bool OnKeyboard (iEvent&);

The function OnKeyboard() will be called when an event arrives Add the following code to `simple.cpp' just before Simple::OnInitialize():

bool Simple::OnKeyboard(iEvent& ev) { csKeyEventType eventtype = csKeyEventHelper::GetEventType(&ev); if (eventtype == csKeyEventTypeDown) { utf32_char code = csKeyEventHelper::GetCookedCode(&ev); if (code == CSKEY_ESC) { csRef<iEventQueue> q = CS_QUERY_REGISTRY(GetObjectRegistry(), iEventQueue); if (q.IsValid()) q->GetEventOutlet()->Broadcast(cscmdQuit); } } return false; }

OnKeyboard() checks if the ESC key has been pressed. If so it uses the object registry to find the global event queue object. Using Broadcast() it then broadcasts the `cscmdQuit' message to all interested parties. This will cause the application to quit by terminating the run-loop.