private void createTreeViewer(Composite treeComp) {
    treeViewer = new ContainerCheckedTreeViewer(treeComp);
    treeViewer.addCheckStateListener(new ICheckStateListener() {
        @Override
        public void checkStateChanged(CheckStateChangedEvent event) {
            processSelectionChange();
        }
    });

    treeViewer.setContentProvider(classProvider);
    treeViewer.setLabelProvider(labelProvider);
    treeViewer.setAutoExpandLevel(2);
    // treeViewer.addFilter(new MethodViewerFilter());
    treeViewer.setUseHashlookup(true);
    treeViewer.setInput("");
    treeViewer.setSelection(new StructuredSelection(treeViewer.getExpandedElements()[0]));
}
 

private void createTreeViewer(Composite treeComp) {
    treeViewer = new ContainerCheckedTreeViewer(treeComp);
    treeViewer.addCheckStateListener(new ICheckStateListener() {
        @Override
        public void checkStateChanged(CheckStateChangedEvent event) {
            getRequestProcsseor().setCheckedElements(treeViewer.getCheckedElements());
            GeneratePropertiesPage.this.getWizard().getContainer().updateButtons();
        }
    });

    treeViewer.setContentProvider(classProvider);
    treeViewer.setLabelProvider(labelProvider);
    treeViewer.setAutoExpandLevel(2);
    treeViewer.setInput("");
    treeViewer.setSelection(new StructuredSelection(treeViewer.getExpandedElements()[0]));
}
 

private void createTreeViewer(Composite treeComp) {
    treeViewer = new ContainerCheckedTreeViewer(treeComp);
    treeViewer.addCheckStateListener(new ICheckStateListener() {
        @Override
        public void checkStateChanged(CheckStateChangedEvent event) {
            getRequestProcessor().setCheckedElements(treeViewer.getCheckedElements());
            ConstructorFieldPage.this.getWizard().getContainer().updateButtons();
        }
    });

    treeViewer.setContentProvider(classProvider);
    treeViewer.setLabelProvider(labelProvider);
    treeViewer.setAutoExpandLevel(2);
    treeViewer.setInput("");
    treeViewer.setSelection(new StructuredSelection(treeViewer.getExpandedElements()[0]));
}
 

public static ContainerCheckedTreeViewer createCheckedTreeViewer(final AbstractDialog dialog, final Composite parent, final int height, final int span) {
    final GridData gridData = new GridData();
    gridData.heightHint = height;
    gridData.horizontalAlignment = GridData.FILL;
    gridData.grabExcessHorizontalSpace = true;
    gridData.horizontalSpan = span;

    final ContainerCheckedTreeViewer viewer = new ContainerCheckedTreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
    final Tree tree = viewer.getTree();
    tree.setLayoutData(gridData);

    viewer.setContentProvider(new TreeNodeContentProvider());
    viewer.setLabelProvider(new ViewLabelProvider());

    if (dialog != null) {
        viewer.addCheckStateListener(new ICheckStateListener() {

            @Override
            public void checkStateChanged(final CheckStateChangedEvent event) {
                dialog.validate();
            }

        });
    }

    return viewer;
}
 

private ContainerCheckedTreeViewer createTree(Composite parent, int style) {
    final ContainerCheckedTreeViewer viewer = new ContainerCheckedTreeViewer(parent, style | SWT.SINGLE | SWT.BORDER
            | SWT.V_SCROLL | SWT.H_SCROLL | SWT.RESIZE) {
        /**
         * Overriden to re-set checked state of elements after filter change
         */
        @Override
        public void refresh(boolean updateLabels) {
            super.refresh(updateLabels);
            setCheckedElements(checkedElements);
        }
    };

    viewer.setContentProvider(contentProvider);
    viewer.setLabelProvider(labelProvider);
    viewer.setInput(allowedTypes);
    Object[] preselected = getPreselected();
    viewer.setCheckedElements(preselected);
    viewer.addPostSelectionChangedListener(new TreeSelectionChangedListener());
    viewer.getTree().addControlListener(new ControlAdapter() {
        @Override
        public void controlResized(ControlEvent e) {
            updateDescription((IStructuredSelection) viewer.getSelection());
        }
    });
    viewer.addCheckStateListener(new TreeCheckStateListener());
    return viewer;
}
 

/**
 * Returns this field editor's list control.
 * 
 * @param parent
 *            the parent control
 * @return the list control
 */
public Tree createListControl(Composite parent) {
	Tree table = (Tree) getTreeControl();
	if (table == null) {
		listParent = parent;
		treeViewer = new ContainerCheckedTreeViewer(parent, SWT.BORDER | SWT.MULTI
				| SWT.V_SCROLL | SWT.H_SCROLL | SWT.FULL_SELECTION);
		table = treeViewer.getTree();
		table.setFont(parent.getFont());
		treeViewer.addCheckStateListener(this);
	} else {
		checkParent(table, parent);
	}
	return table;
}
 

private void createAllObjectGroup(Composite composite) {
    final GridData gridData = new GridData();
    gridData.heightHint = 300;
    gridData.horizontalAlignment = GridData.FILL;
    gridData.grabExcessHorizontalSpace = true;

    this.viewer = new ContainerCheckedTreeViewer(composite, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
    final Tree tree = viewer.getTree();
    tree.setLayoutData(gridData);

    viewer.setContentProvider(new TreeNodeContentProvider());
    viewer.setLabelProvider(new ViewLabelProvider());
}
 

private void createAllSchemaGroup(Composite composite) {
    final GridData gridData = new GridData();
    gridData.heightHint = 300;
    gridData.horizontalAlignment = GridData.FILL;
    gridData.grabExcessHorizontalSpace = true;

    this.viewer = new ContainerCheckedTreeViewer(composite, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
    final Tree tree = viewer.getTree();
    tree.setLayoutData(gridData);

    viewer.setContentProvider(new TreeNodeContentProvider());
    viewer.setLabelProvider(new ViewLabelProvider());
}
 

/**
 * Creates the tree viewer.
 *
 * @param parent          the parent composite
 * @return TreeViewer that shows uses Workbench Content- and LabelProvider
 */
protected ContainerCheckedTreeViewer createTreeViewer(Composite parent) {
  final ContainerCheckedTreeViewer treeViewer = new ContainerCheckedTreeViewer(parent);

  final GridData gridData = new GridData(SWT.FILL, SWT.FILL, true, true);
  gridData.heightHint = 150;
  treeViewer.getTree().setLayoutData(gridData);

  treeViewer.setContentProvider(new WorkbenchContentProvider());
  treeViewer.setLabelProvider(WorkbenchLabelProvider.getDecoratingWorkbenchLabelProvider());
  treeViewer.setSorter(new WorkbenchViewerSorter());

  return treeViewer;
}
 

private void createAllObjectGroup(Composite composite) {
	GridData gridData = new GridData();
	gridData.heightHint = 300;
	gridData.horizontalAlignment = GridData.FILL;
	gridData.grabExcessHorizontalSpace = true;

	this.viewer = new ContainerCheckedTreeViewer(composite, SWT.MULTI
			| SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
	Tree tree = this.viewer.getTree();
	tree.setLayoutData(gridData);

	this.viewer.setContentProvider(new TreeNodeContentProvider());
	this.viewer.setLabelProvider(new ViewLabelProvider());
}
 

private void createAllSchemaGroup(Composite composite) {
	GridData gridData = new GridData();
	gridData.heightHint = 300;
	gridData.horizontalAlignment = GridData.FILL;
	gridData.grabExcessHorizontalSpace = true;

	this.viewer = new ContainerCheckedTreeViewer(composite, SWT.MULTI
			| SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
	Tree tree = this.viewer.getTree();
	tree.setLayoutData(gridData);

	this.viewer.setContentProvider(new TreeNodeContentProvider());
	this.viewer.setLabelProvider(new ViewLabelProvider());
}
 

/**
 * This is a callback that will allow us to create the viewer and initialize
 * it.
 */
@Override
public void createPartControl(Composite parent) {
	Optional<Model> m = ModelRegistryPlugin.getModelRegistry().getActiveTaxonomy();
	contentProvider = new TermContentProvider(viewer);
	viewer = new ContainerCheckedTreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
	viewer.setContentProvider(contentProvider);
	DecoratingLabelProvider p = new DecoratingLabelProvider(new DefaultEObjectLabelProvider(), new TaxonomyLabelDecorator());
	viewer.setLabelProvider(p);
	viewer.addCheckStateListener(this);
	viewer.setSorter(null);

	cellEditor = new MyTextCellEditor(viewer.getTree());

	TreeViewerEditor.create(
			viewer,
			new ColumnViewerEditorActivationStrategy(viewer){
				protected boolean isEditorActivationEvent(ColumnViewerEditorActivationEvent event) {
					return event.eventType == ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION ||
							(event.eventType == ColumnViewerEditorActivationEvent.KEY_PRESSED && event.keyCode == SWT.F2);
				}
			},
			TreeViewerEditor.DEFAULT
	);
	enableEditing();

	if(m.isPresent()){
		viewer.setInput(m.get());
	}
	viewer.expandAll();

	//Create right-click menu
       MenuManager menuManager = new MenuManager();
       Menu menu = menuManager.createContextMenu(viewer.getTree());
       viewer.getTree().setMenu(menu);
       getSite().registerContextMenu(menuManager, viewer);
	getSite().setSelectionProvider(viewer);
	// Create the help context id for the viewer's control
	PlatformUI.getWorkbench().getHelpSystem().setHelp(viewer.getControl(), "de.tudresden.slr.model.taxonomy.ui.viewer");
	getSite().getWorkbenchWindow().getSelectionService().addPostSelectionListener(this);
}
 

private void precheckElements(final ContainerCheckedTreeViewer treeViewer) {
	final IMember[] members= fProcessor.getMembersToMove();
	for (int i= 0; i < members.length; i++) {
		treeViewer.setChecked(members[i], true);
	}
}
 

public ContainerCheckedTreeViewer getViewer() {
	return fViewer;
}
 

public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
	fViewer= (ContainerCheckedTreeViewer) viewer;
}