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weigl, 2019

GUI Extensions defines a couple of extension points for the KeY User Interface. It allows to add new functionality into the gui, without digging through the old UI code. It also should make the UI more consistent, decoupling dependencies and easier to implement new functionality.

General extension points

An extension is defined by an interface, which should be implemented by the new functionality. This interface defines the methods needed to be successfully injected into the UI. GUI Extensions are loaded and found via the ServiceLoader facility of Java. Therefore, you should mention your extension in the appropiate serivce file under META-INF/services/<full-interface-name>.

Every gui extension should be marked with KeyGuiExtension and is only loaded once. It does not matter on how many extension points it participate.

Different GUI extension should not depend on each other, as Gui Extension should loaded independent.

Basic Extension Metadata

Additional meta data can plugged to an extension by adding the Java annotation @KeyGuiExtension.Info.

Currently: name, description, disabled, optional, priority.

Annotation because of accessible via the class w/o instantiation.

  • Extension Points are now in KeyGuiExtension

General UI facilities

Icon Management

KeYIconManagement and KeYIcon introduces a way of icon management and configuration via UIManager.

Key-stroke Management

KeyStrokeManager reworked. It is now possible to define KeyStrokes in a properties file.

Color Management

Sharing Services accross UI extensions

Brings Lookup a successor for a flexible mediator replacement based on a service architecture, incl. Dependency Injection







  • A common settings dialog should replace all existing setting dialogs.
  • A component can register a SettingsProvider to the SettingsManager.getInstance() to participate in the default instance.
  • A SettingsProvider offers mainly a description, a panel, and a handler to save the settings.
  • A SettingsProvider can have children (SettingsProvider).
  • An extension can announce a SettingsProvider by declaring to be KeyGuiExtension.Settings.
  • Existing settings were adopted.


Changes to settings: It is now possible to hook into the proof-independent/-dependent settings by calling addSettings(Settings).