Install eclipse-gef-doc by entering the following commands in the terminal:
sudo apt update sudo apt install eclipse-gef-doc
Eclipse Graphical Editing Framework (documentation)
The Graphical Editing Framework (GEF) provides technology to create rich graphical editors and views for the Eclipse Workbench UI. It bundles three components: . * Draw2d (org.eclipse.draw2d) - A layout and rendering toolkit for displaying graphics on an SWT Canvas. * GEF (MVC) (org.eclipse.gef) - An interactive model-view-controler (MVC) framework, which fosters the implementation of SWT-based tree and Draw2d-based graphical editors for the Eclipse Workbench UI. * Zest (org.eclipse.zest) - A visualization toolkit based on Draw2d, which enables implementation of graphical views for the Eclipse Workbench UI. . Plugin documentation that can be viewed within Eclipse.