Had JavaFX also done that, MouseEvent.MOUSE_CLICKED (AWT import) and MouseEvent.MOUSE_CLICKED (JavaFX import) would be pretty hard to spot. That’s not perfect type-safety, but they were defined as static member variables like MOUSE_CLICKED = 500 so you could at least refer to them easily. Type safety for events in this toolkit was achieved by specifying events as integers. Java’s other windowing solution is the abstract windowing toolkit (AWT). JavaFX has 90 pre-defined event types which can be accessed as static member variables of the Event and sub- Event classes. When defining an EventType, you must specify the Event for which you are defining the type, and a name for the event. As far as I know, JavaFX defines event types using the EventType class for two reasons: Type safety I’ll attempt to do that justice by going through:Įvent types are a JavaFX-specific parameter defined by the EventType class. How to use this resourceĮvents are such a fundamental part of JavaFX, I thought they deserved an attempt to summarise everything in one place. There are 90 separate types of event supported by JavaFX, with the capability to extend the Event class and define additional custom functionality. JavaFX then provides significant support to run executable code, defined separately through the EventHandler class, on any changes of state. ![]() It’s a flag to the system that something has changed. It doesn’t hold any executable code, nor does it run any code. Events can also be fired as a result of scroll or edit events on complex nodes such as TableView and ListView.Īt a very basic level, the Event object is a class with a surprisingly small number of parameters. Events are a versatile, stable way to drive changes on the JavaFX Application thread by setting executable code ahead of time.Īn Event is any change of state in an input device (such as mouse or touch screen), a user action (ActionEvent), or a background task. If you’ve ever sorted a column in a TableView, changed a TreeView, or edited a cell, you’ve already used events to update the interface in the background. Events can be used to drive almost all interface updatesĪs a general rule, if you need to accomplish a simple value-based change, this can be done with Property binding.
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