https://github.com/dtonhofer/javafx_button_exercise

A simple exercise in trying to understand the events generated by a JavaFX button
https://github.com/dtonhofer/javafx_button_exercise

educational example-code javafx javafx-maven-plugin

Last synced: about 1 month ago
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A simple exercise in trying to understand the events generated by a JavaFX button

• Host: GitHub
• URL: https://github.com/dtonhofer/javafx_button_exercise
• Owner: dtonhofer
• License: unlicense
• Created: 2024-10-08T06:42:47.000Z (3 months ago)
• Default Branch: main
• Last Pushed: 2024-10-10T16:26:26.000Z (3 months ago)
• Last Synced: 2024-11-30T08:43:42.972Z (about 1 month ago)
• Topics: educational, example-code, javafx, javafx-maven-plugin
• Language: Java
• Homepage:
• Size: 439 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# javafx_button_exercise

A simple exercise in trying to understand the sequence of events generated by a JavaFX button.

I posted the question

[JavaFX events sent to a button control: why two MOUSE_ENTERED / MOUSE_EXITED events?](https://stackoverflow.com/questions/79059318/javafx-events-sent-to-a-button-control-why-two-mouse-entered-mouse-exited-eve/)

to Stack Overflow, and after clarification, we get the code and diagrams in this project.

The program creates a [Button Control](https://openjfx.io/javadoc/23/javafx.controls/javafx/scene/control/Button.html) which you can prod. 

![Button Control statechart](doc/button.png)

Information about events generated by the Button Control (aka. "received at the Button Control's event handlers) is then printed out.

See the [`MouseEvent` JavaDoc](https://openjfx.io/javadoc/23/javafx.graphics/javafx/scene/input/MouseEvent.html) for a description of events.

After testing a bit, we obtain the following (not quite formally correct) [statechart](https://en.wikipedia.org/wiki/UML_state_machine)

that describes what events are generated. The statechart is large-ish because the sequence of event generated depends on where exactly

the mouse button was pressed - outside the Button Control, inside the Button Control or inside the Button Control's label. 

(But there may well be a simpler statechart.)

![Button Control statechart](doc/Button%20state%20machine.png)

The above has been edited in yEd, which has no notion about statechart semantics. The result is a [graphml file](doc/Button%20state%20machine.graphml).