public class NavigationView extends ViewPart {
	
	public static final String ID = "fast.navigationview";
	
	protected TreeViewer treeViewer;
	protected Text text;
	protected ModuleLabelProvider labelProvider;
	protected Module root;
	
	/** Action pour collapse l'arbre*/
	private Action collapseItemAction;
	
	/** Action pour expand l'arbre*/
	private Action expandItemAction;

	public NavigationView() {
		
	}

	public void createPartControl(Composite parent){
		
		// pour avoir le même style d'onglets que comme dans eclipse
		PlatformUI.getPreferenceStore().setValue(IWorkbenchPreferenceConstants.SHOW_TRADITIONAL_STYLE_TABS, false);	
				
		GridLayout layout = new GridLayout();
		layout.numColumns = 1;
		layout.verticalSpacing = 2;
		layout.marginWidth = 0;
		layout.marginHeight = 2;
		parent.setLayout(layout);
				
		GridData layoutData = new GridData();
		layoutData.grabExcessHorizontalSpace = true;
		layoutData.horizontalAlignment = GridData.FILL;
		
		treeViewer = new TreeViewer(parent);				
		
		treeViewer.setContentProvider(new ModuleContentProvider());
		labelProvider = new ModuleLabelProvider();
		treeViewer.setLabelProvider(labelProvider);
		
		treeViewer.setUseHashlookup(true);
		
		layoutData = new GridData();
		layoutData.grabExcessHorizontalSpace = true;
		layoutData.grabExcessVerticalSpace = true;
		layoutData.horizontalAlignment = GridData.FILL;
		layoutData.verticalAlignment = GridData.FILL;
		treeViewer.getControl().setLayoutData(layoutData);		
		
		treeViewer.setInput(ModuleProvider.getInstance().getModules());
		
		
		treeViewer.addSelectionChangedListener(new ISelectionChangedListener(){
			public void selectionChanged(SelectionChangedEvent event) {
				IActionBars bars = getViewSite().getActionBars();												
				TreeSelection ts = (TreeSelection)event.getSelection();				
				if (ts.getFirstElement() != null){ //if the selection is != of null
					if (ts.getFirstElement().getClass() == Module.class) {
						Module modNode = (Module)ts.getFirstElement();
						bars.getStatusLineManager().setMessage("Selected : " + modNode.getName());						
					}else{						
						SubModule subModNode = (SubModule)ts.getFirstElement();						
						bars.getStatusLineManager().setMessage("Selected : " + subModNode.getName());						
						Activator.getLogger().info("Le status en cas de sous module : " + subModNode.getName());
					}
				}								
			}
		});
		
		// ajout du selectionProvider(treeViewer) au service de selection
		getSite().setSelectionProvider(treeViewer);
		
		createActions();
		createToolbar();
											
	}
	
	public void createActions (){
		
		Activator.getDefault();
		ImageDescriptor plus = Activator.getImageDescriptor("/icons/plus.gif");				
		ImageDescriptor minus = Activator.getImageDescriptor("/icons/minus.gif");
				
		collapseItemAction = new Action ("Collapse", Action.AS_PUSH_BUTTON){
			public void run(){
				for(int i=0; i<treeViewer.getTree().getItemCount(); i++){
					if (!treeViewer.getTree().getItem(i).getExpanded())
						treeViewer.getTree().getItem(i).setExpanded(true);
				}
				treeViewer.refresh();
			}			
		};
		collapseItemAction.setToolTipText("Collapse all the tree");
		collapseItemAction.setImageDescriptor(minus);
		
		expandItemAction = new Action("Expand", Action.AS_PUSH_BUTTON) {
			public void run(){
				for(int i=0; i<treeViewer.getTree().getItemCount(); i++){
					if (treeViewer.getTree().getItem(i).getExpanded())
						treeViewer.getTree().getItem(i).setExpanded(false);
				}
				treeViewer.refresh();
			}				
		};
		expandItemAction.setToolTipText("Expand all the tree");
		expandItemAction.setImageDescriptor(plus);
	}
	
	/**
	 * Création de la barre d'outils de la fenêtre de navigation
	 */
	private void createToolbar() {
		IToolBarManager toolbarManager = getViewSite().getActionBars().getToolBarManager();
		toolbarManager.add(collapseItemAction);
		toolbarManager.add(expandItemAction);
	}
		
	/**
	 * la méthode setFocus() définit la transmission à la vue
	 */
	public void setFocus() {
		treeViewer.getControl().setFocus();
	}		
}