Example usage for org.eclipse.jface.viewers ViewerCell setStyleRanges

List of usage examples for org.eclipse.jface.viewers ViewerCell setStyleRanges

  1. HOME
  2. Java
  3. org.eclipse.jface
  4. org.eclipse.jface.viewers.*
  5. ViewerCell
  6. setStyleRanges

Introduction

In this page you can find the example usage for org.eclipse.jface.viewers ViewerCell setStyleRanges.

Prototype

public void setStyleRanges(StyleRange[] styleRanges)

Source Link

Document

Set the style ranges to be applied on the text label Note: Requires StyledCellLabelProvider with owner draw enabled.

Usage

From source file:eu.esdihumboldt.hale.ui.util.groovy.ast.viewer.ASTViewer.java

License:Open Source License

/**
 * Constructor.//  w w  w .  j av  a2 s.c  om
 * 
 * @param parent the parent composite
 * @param textViewer a text viewer where the code for an AST node should be
 *            selected on double click, or <code>null</code>
 */
public ASTViewer(Composite parent, ITextViewer textViewer) {
    this.textViewer = textViewer;

    page = new Composite(parent, SWT.NONE);
    TreeColumnLayout layout = new TreeColumnLayout();
    page.setLayout(layout);

    treeViewer = new TreeViewer(page, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
    //      new DrillDownAdapter(viewer);
    treeViewer.setContentProvider(new ViewContentProvider());
    treeViewer.setLabelProvider(new ViewLabelProvider());

    treeViewer.getTree().setHeaderVisible(true);

    TreeViewerColumn mainColumn = new TreeViewerColumn(treeViewer, SWT.NONE);
    mainColumn.setLabelProvider(new StyledCellLabelProvider() {

        @Override
        public void update(ViewerCell cell) {
            Object element = cell.getElement();

            StyledString text = new StyledString();
            text.append(element.getClass().getSimpleName());

            cell.setText(text.getString());
            cell.setStyleRanges(text.getStyleRanges());

            super.update(cell);
        }
    });
    mainColumn.getColumn().setText("Node");
    layout.setColumnData(mainColumn.getColumn(), new ColumnPixelData(200));

    TreeViewerColumn infoColumn = new TreeViewerColumn(treeViewer, SWT.NONE);
    infoColumn.setLabelProvider(new StyledCellLabelProvider() {

        @Override
        public void update(ViewerCell cell) {
            Object element = cell.getElement();

            StyledString text = new StyledString();
            if (element instanceof Parameter) {
                // getText not implemented for Parameter
                Parameter param = (Parameter) element;
                text.append(param.getName());
            } else if (element instanceof ExpressionStatement) {
                // getText not properly implemented for ExpressionStatement
                text.append(((ExpressionStatement) element).getExpression().getText());
            } else if (element instanceof ASTNode) {
                ASTNode node = (ASTNode) element;
                text.append(node.getText());
            } else if (element instanceof Variable) {
                Variable var = (Variable) element;
                text.append(var.getName());
            } else {
                text.append(element.toString());
            }

            cell.setText(text.getString());
            cell.setStyleRanges(text.getStyleRanges());

            super.update(cell);
        }
    });
    infoColumn.getColumn().setText("Text");
    layout.setColumnData(infoColumn.getColumn(), new ColumnPixelData(300));

    TreeViewerColumn propertiesColumn = new TreeViewerColumn(treeViewer, SWT.NONE);
    propertiesColumn.setLabelProvider(new StyledCellLabelProvider() {

        @Override
        public void update(ViewerCell cell) {
            Object element = cell.getElement();

            StyledString text = new StyledString();
            if (element instanceof Variable || element instanceof ASTNode || element instanceof VariableScope) {
                ASTNodeUtil.addProperties(element, text);
            }

            cell.setText(text.getString());
            cell.setStyleRanges(text.getStyleRanges());

            super.update(cell);
        }
    });
    propertiesColumn.getColumn().setText("Properties");
    layout.setColumnData(propertiesColumn.getColumn(), new ColumnPixelData(1600));

    makeActions();
    if (textViewer != null) {
        addDoubleClickAction();
    }
}

From source file:eu.esdihumboldt.hale.ui.views.data.internal.compare.DefinitionInstanceLabelProvider.java

License:Open Source License

/**
 * @see CellLabelProvider#update(ViewerCell)
 *///from  w  w w .  j a va  2  s  .c o  m
@Override
public void update(ViewerCell cell) {
    TreePath treePath = cell.getViewerRow().getTreePath();

    InstanceEntry entry = findInstanceEntry(treePath);
    Object value = entry.value;

    InstanceValidationReport report = null;
    // If childDef is null we are at the top element.
    if (entry.definition && entry.childDef == null) {
        report = InstanceValidator.validate(instance);
    }

    boolean hasValue = false;
    if (entry.definition && value instanceof Instance) {
        hasValue = ((Instance) value).getValue() != null;
    } else if (!entry.definition && treePath.getSegmentCount() == 1) {
        // metadata root
        if (instance.getMetaDataNames().isEmpty()) {
            hasValue = true;
            value = null;
        }
    }

    StyledString styledString;
    if (value == null) {
        styledString = new StyledString("no value", StyledString.DECORATIONS_STYLER);
    } else if (value instanceof Group && !hasValue) {
        styledString = new StyledString("+", StyledString.QUALIFIER_STYLER);
    } else {
        if (value instanceof Instance) {
            value = ((Instance) value).getValue();
        }
        // TODO some kind of conversion?
        String stringValue = value.toString();
        /*
         * Values that are very large, e.g. string representations of very
         * complex geometries lead to
         * StyledCellLabelProvider.updateTextLayout taking a very long time,
         * rendering the application unresponsive when the data views are
         * displayed. As such, we reduce the string to a maximum size.
         */
        if (stringValue.length() > MAX_STRING_LENGTH) {
            stringValue = stringValue.substring(0, MAX_STRING_LENGTH) + "...";
        }

        styledString = new StyledString(stringValue, null);
    }

    // mark cell if there are other values
    if (entry.valueCount > 1) {
        String decoration = " "
                + MessageFormat.format(MULTIPLE_VALUE_FORMAT, entry.choice + 1, entry.valueCount);
        styledString.append(decoration, StyledString.COUNTER_STYLER);
    }

    cell.setText(styledString.toString());
    cell.setStyleRanges(styledString.getStyleRanges());

    if (report != null && !report.getWarnings().isEmpty())
        cell.setImage(PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJS_WARN_TSK));

    super.update(cell);
}

From source file:eu.esdihumboldt.hale.ui.views.data.internal.explore.InstanceValueLabelProvider.java

License:Open Source License

/**
 * @see CellLabelProvider#update(ViewerCell)
 *//*from   w  w  w  .  j a v a2s.c  o  m*/
@Override
public void update(ViewerCell cell) {
    TreePath treePath = cell.getViewerRow().getTreePath();
    Object element = treePath.getLastSegment();
    Definition<?> definition = null;

    Object value = ((Pair<?, ?>) element).getSecond();
    if (((Pair<?, ?>) element).getFirst() instanceof Definition)
        definition = (Definition<?>) ((Pair<?, ?>) element).getFirst();

    InstanceValidationReport report = null;
    if (definition instanceof ChildDefinition<?>)
        report = InstanceValidator.validate(value, (ChildDefinition<?>) ((Pair<?, ?>) element).getFirst());
    else if (definition instanceof TypeDefinition)
        report = InstanceValidator.validate((Instance) value);

    boolean hasValue = false;
    if (value instanceof Instance) {
        hasValue = ((Instance) value).getValue() != null;
    }

    StyledString styledString;
    if (value == null) {
        styledString = new StyledString("no value", StyledString.DECORATIONS_STYLER);
    } else if (value instanceof Group && !hasValue) {
        styledString = new StyledString("+", StyledString.QUALIFIER_STYLER);
    } else {
        if (value instanceof Instance) {
            value = ((Instance) value).getValue();
        }
        // TODO some kind of conversion?
        String stringValue = value.toString();
        /*
         * Values that are very large, e.g. string representations of very
         * complex geometries lead to
         * StyledCellLabelProvider.updateTextLayout taking a very long time,
         * rendering the application unresponsive when the data views are
         * displayed. As such, we reduce the string to a maximum size.
         */
        if (stringValue.length() > MAX_STRING_LENGTH) {
            stringValue = stringValue.substring(0, MAX_STRING_LENGTH) + "...";
        }

        styledString = new StyledString(stringValue, null);
    }

    cell.setText(styledString.toString());
    cell.setStyleRanges(styledString.getStyleRanges());

    if (report != null && !report.getWarnings().isEmpty())
        cell.setImage(PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJS_WARN_TSK));

    super.update(cell);
}

From source file:eu.esdihumboldt.hale.ui.views.resources.internal.ResourcesLabelProvider.java

License:Open Source License

@Override
public void update(ViewerCell cell) {
    Object element = cell.getElement();
    cell.setImage(getImage(element));/*from  w  w w  .ja  v a 2 s .  co m*/

    StyledString text = new StyledString(getText(element));

    if (element instanceof Resource) {
        Resource resource = (Resource) element;
        if (resource.getContentType() != null) {
            text.append(" (" + resource.getContentType().getName() + ")", StyledString.DECORATIONS_STYLER);
        }
    }

    cell.setText(text.getString());
    cell.setStyleRanges(text.getStyleRanges());

    super.update(cell);
}

From source file:fr.esrf.icat.manager.core.icatserver.IcatServerLabelProvider.java

License:Apache License

@Override
public void update(ViewerCell cell) {
    Object element = cell.getElement();
    StyledString text = new StyledString();
    if (element instanceof ICATServer) {
        ICATServer icatServer = (ICATServer) element;
        text.append(icatServer.getServerURL());
        if (icatServer.isConnected()) {
            cell.setImage(null);/*from w ww  .j  av  a  2 s. co  m*/
            text.append(" (" + icatServer.getVersion() + ") ", StyledString.QUALIFIER_STYLER);
        }
        switch (icatServer.getStatus()) {
        case CONNECTED:
            cell.setImage(connected_server_image);
            break;
        case FAILED:
            cell.setImage(failed_server_image);
            break;
        default:
            cell.setImage(unknown_server_image);
            break;
        }

    } else if (element instanceof ICATEntity) {
        ICATEntity entity = (ICATEntity) element;
        text.append(entity.getEntityName());
        Long count = entitiesCount.get(entity);
        if (null != count) {
            text.append(" (" + count.toString() + ") ", StyledString.COUNTER_STYLER);
        }
    } else {
        text.append(element.toString());
    }
    cell.setText(text.toString());
    cell.setStyleRanges(text.getStyleRanges());
    super.update(cell);
}

From source file:hydrograph.ui.help.aboutDialog.HydrographInstallationDialog.java

License:Apache License

protected void createFolderItems(CTabFolder folder) {
    IConfigurationElement[] elements = ConfigurationInfo.getSortedExtensions(loadElements());
    for (int i = 0; i < elements.length; i++) {
        IConfigurationElement element = elements[i];
        if (!element.getAttribute(IWorkbenchRegistryConstants.ATT_NAME).equalsIgnoreCase("Features")) {
            CTabItem item = new CTabItem(folder, SWT.NONE);

            item.setText(element.getAttribute(IWorkbenchRegistryConstants.ATT_NAME));
            item.setData(element);//from   ww  w .j  a  v  a 2 s  .  c  o m
            item.setData(ID, element.getAttribute(IWorkbenchRegistryConstants.ATT_ID));

            Composite control = new Composite(folder, SWT.NONE);
            control.setLayout(new GridLayout());
            item.setControl(control);
        }
    }

    CTabItem tbtmLibraries = new CTabItem(folder, SWT.NONE);
    tbtmLibraries.setText("Libraries");

    composite_1 = new Composite(folder, SWT.NONE);
    composite_1.setLayout(new GridLayout(1, false));
    tbtmLibraries.setControl(composite_1);

    URL url = FileLocator.find(bundle, path, null);
    try {
        fileUrl = FileLocator.toFileURL(url);
    } catch (IOException e2) {
        logger.error(e2.getMessage());
    }
    tableViewer = new TableViewer(composite_1, SWT.BORDER | SWT.FULL_SELECTION | SWT.H_SCROLL | SWT.V_SCROLL);
    Table table = tableViewer.getTable();
    table.setLinesVisible(true);
    table.setHeaderVisible(true);
    table.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
    readFromXMLFile(fileUrl);
    createTableViewerColumns(tableViewer, "Name");
    createTableViewerColumns(tableViewer, "Version No");
    createTableViewerColumns(tableViewer, "Group Id");
    createTableViewerColumns(tableViewer, "Artifact Id");
    TableViewerColumn tableLicense = createTableViewerColumns(tableViewer, "License Info");

    TableViewerColumn tableViewerColumn = new TableViewerColumn(tableViewer, SWT.NONE);
    TableColumn tblclmnItem = tableViewerColumn.getColumn();
    tblclmnItem.setWidth(0);
    tblclmnItem.setResizable(false);
    tblclmnItem.setText("Path");

    tableViewer.setLabelProvider(new InstallationDetailsLabelProvider());
    tableViewer.setContentProvider(new InstallationDetailsContentProvider());
    tableViewer.setInput(installationWindowDetails.getJarInfromationDetails());
    tableLicense.setLabelProvider(new StyledCellLabelProvider() {
        @Override
        public void update(ViewerCell cell) {
            Object element = cell.getElement();
            if (element instanceof JarInformationDetails) {
                JarInformationDetails jarInfo = (JarInformationDetails) cell.getElement();

                /* make text look like a link */
                StyledString text = new StyledString();
                StyleRange myStyledRange = new StyleRange(0, jarInfo.getLicenseInfo().length(),
                        Display.getCurrent().getSystemColor(SWT.COLOR_BLUE), null);
                myStyledRange.underline = true;
                text.append(jarInfo.getLicenseInfo(), StyledString.DECORATIONS_STYLER);
                cell.setText(text.toString());

                StyleRange[] range = { myStyledRange };
                cell.setStyleRanges(range);

                super.update(cell);

            }
        }
    });
    tableViewer.refresh();

    tableViewer.getControl().addMouseListener(new MouseAdapter() {

        @Override
        public void mouseUp(MouseEvent e) {
            StructuredSelection selection = (StructuredSelection) tableViewer.getSelection();
            JarInformationDetails details = (JarInformationDetails) selection.getFirstElement();
            if (details != null) {
                IPath iPath = new Path(details.getPath());
                try {
                    URL url = FileLocator.find(bundle, iPath, null);
                    URL fileUrlForPath = FileLocator.toFileURL(url);
                    PlatformUI.getWorkbench().getBrowserSupport().getExternalBrowser().openURL(fileUrlForPath);
                } catch (PartInitException | IOException e1) {
                    logger.error(e1.getMessage());
                    WidgetUtility.errorMessage("Unable to open URL in external browser");
                }
            }

        }
    });
}

From source file:msi.gama.gui.viewers.csv.CSVLabelProvider.java

License:Apache License

/**
 * @see org.eclipse.jface.viewers.StyledCellLabelProvider#update(org.eclipse.jface.viewers.ViewerCell)
 *///from w  w w. j ava 2 s.  c  om
@Override
public void update(final ViewerCell cell) {
    CSVRow element = (CSVRow) cell.getElement();
    int index = cell.getColumnIndex();
    String columnText = getColumnText(element, index);
    cell.setText(columnText);
    cell.setImage(null);
    if (searchText != null && searchText.length() > 0) {
        int intRangesCorrectSize[] = SearchResultStyle.getSearchTermOccurrences(searchText, columnText);
        List<StyleRange> styleRange = new ArrayList<StyleRange>();
        for (int i = 0; i < intRangesCorrectSize.length / 2; i++) {
            StyleRange myStyleRange = new StyleRange(0, 0, null, searchColor);
            myStyleRange.start = intRangesCorrectSize[i];
            myStyleRange.length = intRangesCorrectSize[++i];
            styleRange.add(myStyleRange);
        }
        cell.setStyleRanges(styleRange.toArray(new StyleRange[styleRange.size()]));
    } else {
        cell.setStyleRanges(null);
    }

    super.update(cell);
}

From source file:net.sourceforge.docfetcher.view.ScopeGroup.java

License:Open Source License

private void initViewer() {
    // Remove selection when viewer loses focus
    viewer.getTree().addFocusListener(new FocusAdapter() {
        public void focusLost(FocusEvent e) {
            ((Tree) e.widget).deselectAll();

            /*/*from   w w w.j  ava  2 s.co  m*/
             * We have to deactivate the context menu entries manually since
             * the deselectAll call will not cause a SelectionChangedEvent.
             */
            viewerMenu.setManagedActionsEnabled(false);
        }
    });

    viewer.setContentProvider(new ITreeContentProvider() {
        public Object[] getElements(Object inputElement) {
            return (RootScope[]) inputElement;
        }

        public Object[] getChildren(Object parentElement) {
            return ((Scope) parentElement).getChildren();
        }

        public boolean hasChildren(Object element) {
            return getChildren(element).length > 0;
        }

        public Object getParent(Object element) {
            return ((Indexable) element).getParent();
        }

        public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        }

        public void dispose() {
        }
    });

    class MyStyledCellLabelProvider extends StyledCellLabelProvider {
        private Styler styler;

        public MyStyledCellLabelProvider() {
            styler = new Styler() {
                public void applyStyles(TextStyle textStyle) {
                    textStyle.foreground = UtilGUI.getColor(SWT.COLOR_DARK_GRAY);
                }
            };
        }

        public void update(ViewerCell cell) {
            Indexable scope = (Indexable) cell.getElement();
            File file = scope.getFile();
            String label = file.getName();
            if (label.equals("")) // applies to root directories, i.e. "C:\\" //$NON-NLS-1$
                label = file.getAbsolutePath();

            // "temp" prefix for RootScopes that will be deleted on exit
            if (scope instanceof RootScope)
                if (((RootScope) scope).isDeleteOnExit())
                    label = "[X]  " + label; //$NON-NLS-1$

            StyledString styledString = new StyledString(label, null);
            if (scope instanceof RootScope) {
                String path = file.getAbsolutePath();
                styledString.append(" --- " + path, styler); //$NON-NLS-1$
            }
            cell.setText(styledString.toString());
            cell.setStyleRanges(styledString.getStyleRanges());
        }

        protected void measure(org.eclipse.swt.widgets.Event event, Object element) {
            super.measure(event, element);
        }
    }
    viewer.setLabelProvider(new MyStyledCellLabelProvider());

    viewer.setSorter(new ViewerSorter() {
        public int compare(Viewer viewer, Object e1, Object e2) {
            String name1 = ((Scope) e1).getFile().getName();
            String name2 = ((Scope) e2).getFile().getName();
            return name1.compareToIgnoreCase(name2);
        }
    });

    /*
     * Because the check states of the viewer items are maintained manually,
     * they have to be kept in sync with tree expansion events.
     */
    viewer.addTreeListener(new ITreeViewerListener() {
        public void treeExpanded(TreeExpansionEvent event) {
            Indexable[] newScopes = ((Scope) event.getElement()).getChildren();
            updateVisibleCheckStates(newScopes);
        }

        public void treeCollapsed(TreeExpansionEvent event) {
            // Do nothing
        }
    });

    /*
     * Check/uncheck children of checked/unchecked item and propagate
     * checkstate changes in viewer back to the model.
     */
    viewer.addCheckStateListener(new ICheckStateListener() {
        public void checkStateChanged(CheckStateChangedEvent event) {
            Event.hold();
            ((Scope) event.getElement()).setCheckedDeep(event.getChecked());
            Event.flush();
            updateVisibleCheckStates(new Object[] { event.getElement() });
        }

    });

    // Doubleclick on item in viewer results in expand/collapse of its children
    viewer.addDoubleClickListener(new IDoubleClickListener() {
        public void doubleClick(DoubleClickEvent event) {
            Object[] objects = ((StructuredSelection) viewer.getSelection()).toArray();
            if (objects.length != 1)
                return;
            viewer.setExpandedState(objects[0], !viewer.getExpandedState(objects[0]));
            updateVisibleCheckStates(new Scope[0]);
        }
    });
}

From source file:net.tourbook.photo.internal.PicDirFolder.java

License:Open Source License

private void createUI_10_TreeView(final Composite parent) {

    /*//from   ww  w  .ja v a 2 s .c  om
     * create tree layout
     */

    final Composite layoutContainer = new Composite(parent, SWT.NONE);
    GridDataFactory.fillDefaults()//
            .grab(true, true).hint(200, 100).applyTo(layoutContainer);

    final TreeColumnLayout treeLayout = new TreeColumnLayout();
    layoutContainer.setLayout(treeLayout);

    /*
     * create viewer
     */
    final Tree tree = new Tree(layoutContainer, SWT.V_SCROLL | SWT.SINGLE | SWT.FULL_SELECTION);

    tree.setHeaderVisible(false);

    tree.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseDown(final MouseEvent e) {
            _doAutoCollapseExpand = true;
            _isMouseContextMenu = e.button == 3;
        }
    });

    _folderViewer = new TreeViewer(tree);

    _folderViewer.setContentProvider(new FolderContentProvider());
    _folderViewer.setComparer(new FolderComparer());
    _folderViewer.setUseHashlookup(true);

    _folderViewer.addDoubleClickListener(new IDoubleClickListener() {
        public void doubleClick(final DoubleClickEvent event) {

            // expand/collapse current item
            final Object selection = ((IStructuredSelection) _folderViewer.getSelection()).getFirstElement();

            final TVIFolderFolder treeItem = (TVIFolderFolder) selection;

            expandCollapseFolder(treeItem);
        }
    });

    _folderViewer.addSelectionChangedListener(new ISelectionChangedListener() {
        public void selectionChanged(final SelectionChangedEvent event) {
            onSelectFolder((ITreeSelection) event.getSelection());
        }
    });

    /*
     * create columns
     */
    TreeViewerColumn tvc;
    TreeColumn tvcColumn;

    // column: os folder
    tvc = new TreeViewerColumn(_folderViewer, SWT.TRAIL);
    tvcColumn = tvc.getColumn();
    tvc.setLabelProvider(new StyledCellLabelProvider() {

        @Override
        public void update(final ViewerCell cell) {

            final Object element = cell.getElement();

            if (element instanceof TVIFolderFolder) {
                final TVIFolderFolder folderItem = (TVIFolderFolder) element;

                final StyledString styledString = new StyledString();

                styledString.append(folderItem._folderName);

                if (_isStateShowFileFolderInFolderItem) {

                    if (folderItem.isFolderLoaded()) {

                        final int folderCounter = folderItem.getFolderCounter();
                        if (folderCounter > 0) {
                            styledString.append(UI.SPACE2);
                            styledString.append(Integer.toString(folderCounter), PhotoUI.PHOTO_FOLDER_STYLER);
                        }

                        final int fileCounter = folderItem.getFileCounter();
                        if (fileCounter > 0) {
                            styledString.append(net.tourbook.common.UI.SPACE2);
                            styledString.append(Integer.toString(fileCounter), PhotoUI.PHOTO_FILE_STYLER);
                        }

                    } else {

                        // force that file list is loaded and number of files is available

                        putFolderInWaitingQueue(folderItem, false);

                        styledString.append(UI.SPACE2 + Messages.Pic_Dir_StatusLable_LoadingFolder_InFolderTree,
                                PhotoUI.PHOTO_FOLDER_STYLER);
                    }
                }

                cell.setText(styledString.getString());
                cell.setStyleRanges(styledString.getStyleRanges());
            }
        }
    });
    treeLayout.setColumnData(tvcColumn, new ColumnWeightData(100, true));
}

From source file:net.tourbook.preferences.PrefPageTags.java

License:Open Source License

private void createUI_20_TagViewer(final Composite parent) {

    /*//w  w  w.java2s  .c  om
     * create tree layout
     */

    final Composite layoutContainer = new Composite(parent, SWT.NONE);
    GridDataFactory.fillDefaults()//
            .grab(true, true).hint(200, 100).applyTo(layoutContainer);

    final TreeColumnLayout treeLayout = new TreeColumnLayout();
    layoutContainer.setLayout(treeLayout);

    /*
     * create viewer
     */
    final Tree tree = new Tree(layoutContainer, SWT.H_SCROLL | SWT.V_SCROLL
    //            | SWT.BORDER
            | SWT.MULTI | SWT.FULL_SELECTION);

    tree.setHeaderVisible(false);
    tree.setLinesVisible(getPreferenceStore().getBoolean(ITourbookPreferences.VIEW_LAYOUT_DISPLAY_LINES));

    _tagViewer = new TreeViewer(tree);

    _tagViewer.setContentProvider(new TagViewerContentProvicer());
    _tagViewer.setComparator(new TagViewerComparator());
    _tagViewer.setUseHashlookup(true);

    _tagViewer.addDoubleClickListener(new IDoubleClickListener() {
        @Override
        public void doubleClick(final DoubleClickEvent event) {

            final Object selection = ((IStructuredSelection) _tagViewer.getSelection()).getFirstElement();

            if (selection instanceof TVIPrefTag) {

                // tag is selected

                onRenameTourTag();

            } else if (selection instanceof TVIPrefTagCategory) {

                // expand/collapse current item

                final TreeViewerItem tourItem = (TreeViewerItem) selection;

                if (_tagViewer.getExpandedState(tourItem)) {
                    _tagViewer.collapseToLevel(tourItem, 1);
                } else {
                    _tagViewer.expandToLevel(tourItem, 1);
                }
            }
        }
    });

    _tagViewer.addSelectionChangedListener(new ISelectionChangedListener() {
        @Override
        public void selectionChanged(final SelectionChangedEvent event) {
            enableButtons();
        }
    });

    _tagViewer.addDragSupport(DND.DROP_MOVE, new Transfer[] { LocalSelectionTransfer.getTransfer() },
            new DragSourceListener() {

                @Override
                public void dragFinished(final DragSourceEvent event) {

                    final LocalSelectionTransfer transfer = LocalSelectionTransfer.getTransfer();

                    if (event.doit == false) {
                        return;
                    }

                    transfer.setSelection(null);
                    transfer.setSelectionSetTime(0);
                }

                @Override
                public void dragSetData(final DragSourceEvent event) {
                    // data are set in LocalSelectionTransfer
                }

                @Override
                public void dragStart(final DragSourceEvent event) {

                    final LocalSelectionTransfer transfer = LocalSelectionTransfer.getTransfer();
                    final ISelection selection = _tagViewer.getSelection();

                    //                  System.out.println("dragStart");
                    transfer.setSelection(selection);
                    transfer.setSelectionSetTime(_dragStartTime = event.time & 0xFFFFFFFFL);

                    event.doit = !selection.isEmpty();
                }
            });

    _tagViewer.addDropSupport(DND.DROP_MOVE, new Transfer[] { LocalSelectionTransfer.getTransfer() },
            new TagDropAdapter(this, _tagViewer));

    /*
     * create columns
     */
    TreeViewerColumn tvc;
    TreeColumn tvcColumn;

    // column: tags + tag categories
    tvc = new TreeViewerColumn(_tagViewer, SWT.TRAIL);
    tvcColumn = tvc.getColumn();
    tvc.setLabelProvider(new StyledCellLabelProvider() {
        @Override
        public void update(final ViewerCell cell) {

            final StyledString styledString = new StyledString();

            final Object element = cell.getElement();
            if (element instanceof TVIPrefTag) {

                final TourTag tourTag = ((TVIPrefTag) element).getTourTag();

                styledString.append(tourTag.getTagName(), UI.TAG_STYLER);
                cell.setImage(tourTag.isRoot() ? _imgTagRoot : _imgTag);

            } else if (element instanceof TVIPrefTagCategory) {

                final TVIPrefTagCategory tourTagCategoryItem = (TVIPrefTagCategory) element;
                final TourTagCategory tourTagCategory = tourTagCategoryItem.getTourTagCategory();

                cell.setImage(_imgTagCategory);

                styledString.append(tourTagCategory.getCategoryName(), UI.TAG_CATEGORY_STYLER);

                // get number of categories
                final int categoryCounter = tourTagCategory.getCategoryCounter();
                final int tagCounter = tourTagCategory.getTagCounter();
                if (categoryCounter == -1 && tagCounter == -1) {

                    //                  styledString.append("  ...", StyledString.COUNTER_STYLER);

                } else {

                    String categoryString = UI.EMPTY_STRING;
                    if (categoryCounter > 0) {
                        categoryString = "/" + categoryCounter; //$NON-NLS-1$
                    }
                    styledString.append("   " + tagCounter + categoryString, StyledString.QUALIFIER_STYLER); //$NON-NLS-1$
                }

            } else {
                styledString.append(element.toString());
            }

            cell.setText(styledString.getString());
            cell.setStyleRanges(styledString.getStyleRanges());
        }
    });
    treeLayout.setColumnData(tvcColumn, new ColumnWeightData(100, true));
}