The XPLATFORM application is based on EDA(Event-Driven Architecture). Or all the starting point that the developer develops at the XPLATFORM application starts from Event Function.

Overall of Event

Event Handling Target

At the XPLATFORM application, all the Objects are not the Event handling target. Mainly, the Objects whose state is changed dynamically are the Event handling targets. For the Event handling, the part that the developer handles the Script is called as Event Function.

The following is the object that can register Event Function at UX-Studio:

Project Explorer Classification	Object that can Register Event	description
ADL	ADL	- registers the functions that handle Events about loading/starting/finish of the application.
	Frames	- registers the functions that handle the Events which occurs at Frame Object like MainFrame, Frameset, ChildFrame, etc.
	Tray	- registers Events which handle Events that occurs at Tray.
	Application Menu	- registers Event that handles Event which occurs at Application Menu.
Global Variable	Datasets	- registers Event that handles the Event of Dataset registered at Global Variable.
Service	Form	- registers Event that handles Event which occurs when Form is operated.
	Components	- registers Event that handles Event which occurs when the Components in Form are operated.
	Invisible Objects	- registers Events that handles Events which occurs when Invisible Objects in Form are operated.

Transition between Parent-Child Event

The objects that have the relationship between parent-child is based on that the event is transited to the high level parent.

Or when the Event occurs at Component which belongs to any Form, the same Event occurs at the Form where the Component belongs to. But when the parent doesn’t treat the applicable Event, this doesn’t occur.

The followings are Events that transit Event to the parent:

classification	Events	Does the Default occurs to parent?
Keyboard Key	onkeyup()	O
Mouse Moving	onmousemove() onmouseleave() onmouseenter()	O O O
Mouse Button	onmousewheel() onrbuttondown() onrbuttonup() onlbuttondown() onlbuttonup() onmousedown() onmouseup()	O O O O O O O
Mouse drag	ondrag() ondragenter() ondragleave() ondrop()	X O O O

Notation

From “Key event Flow”, the order of the Event occurrence per Component is represented at the flow chart. Here, the notation of the flow chart is described.

Figures used at Event Flow

figure	definition
	User’s input
	Event
	Event without Return value
	Event that the applicable event doesn’t occur at the top Component at true return The value for default return is false.
	Event that the applicable event occurs at the top component at true return The value for default return is true.
	condition/judgement
	Return value
	Default return value
	Condition flow
	No more operation
	Event Module