Assigns a handler to the "Closing" event.
instance.Closing(class handleClass, string signature)
|class||handleClass||An instance with the handler as the member.|
|string||signature||Signature of the handler.|
|switch||An instance to control handler execution.|
Suppose you have the following class definition.
open method void CHandler(dictionary dic)
switch sw = dic.Switch;
Handler assignment is as follows.
window w = new window();
handle h = new handle();
switch sw = w.Closing(h,"CHandler(dictionary)");
The "Closing" event occurs just before the window is closed.
You can cancel the event by assigning true to the 'Cancel' key of the handler argument. If you cancel, the window will not close.
The handler for the "Closing" event must be an open method with one argument of the dictionary class.
In other words, if the method name of the handler is "handlerName", the definition of the handler is as follows.
open method void handlerName(dictionary dic)
In this case, the signature of the handler specify by the second argument is "handlerName(dictionary)".
The dictionary passed to the handler has the following key/value pairs.
|key||value - class||value - description|
|Sender||window||The origin of the event.|
|Switch||switch||The switch returned by the handler assignment.|
|Cancel||bool||Whether to cancel the event.|
The handler runs in the UI thread.
Links for reference