Table Of Contents
User Interface Events
User interface events are events that occur when a user performs a particular action on the panel.
Each time a user interface event occurs, the diagram executes the code you write for the event. Compared with polling the user interface in a loop for interactions, user interface events reduce the CPU requirements of your program, simplify the diagram code, and ensure that the diagram can respond to all user actions.
You can select from two categories of user interface events: notify and filter.
| Event Type | Description | Example | Use Case |
|---|---|---|---|
| Notify | Informs you that a user action occurred. |
Configure an Event structure to execute in order to handle a Value Change event when the user changes the value of a control. |
Use notify events only if you want to know the user performed a specific action. |
| Filter | Allows you to validate or change the event data before the software performs the default action associated with that event. You can also discard the event to prevent the change. |
Configure an Event structure to discard a Key down? event, which prevents a user from clicking the mouse to select or change behavior on the panel. |
Use filter events if you want to influence how the software handles certain user actions. |
