Java tutorial
/******************************************************************************* * Copyright (c) 2011, 2013 Wind River Systems, Inc. and others. All rights reserved. * This program and the accompanying materials are made available under the terms * of the Eclipse Public License v1.0 which accompanies this distribution, and is * available at http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Wind River Systems - initial API and implementation *******************************************************************************/ package org.eclipse.tcf.te.ui.trees; import java.util.ArrayList; import java.util.List; import org.eclipse.core.runtime.IAdaptable; import org.eclipse.core.runtime.Platform; import org.eclipse.jface.viewers.DecoratingLabelProvider; import org.eclipse.jface.viewers.ILabelDecorator; import org.eclipse.jface.viewers.ITableColorProvider; import org.eclipse.jface.viewers.ITableFontProvider; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.ITreeContentProvider; import org.eclipse.jface.viewers.LabelDecorator; import org.eclipse.jface.viewers.TreePath; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.Image; import org.eclipse.tcf.te.core.interfaces.IFilterable; import org.eclipse.tcf.te.ui.utils.TreeViewerUtil; /** * A subclass of DecoratingLabelProvider provides an FS Tree Viewer * with a label provider which combines a nested label provider and an optional * decorator. The decorator decorates the label text, image * provided by the nested label provider. * */ public class TreeViewerDecoratingLabelProvider extends DecoratingLabelProvider implements ITableLabelProvider, ITableColorProvider, ITableFontProvider { //The label provider for the execution context viewer. private TreeViewerLabelProvider fProvider; //The label decorator decorating the above label provider. private ILabelDecorator fDecorator; //Tree viewer that this label provider serves. private TreeViewer viewer; // The content provider of this viewer. private ITreeContentProvider contentProvider; /** * Create a decorating label provider instance with an label provider and a label decorator. * * @param provider The label provider to be decorated. * @param decorator The label decorator. */ public TreeViewerDecoratingLabelProvider(TreeViewer viewer, TreeViewerLabelProvider provider, ILabelDecorator decorator) { super(provider, decorator); fProvider = provider; fDecorator = decorator; this.viewer = viewer; } /* (non-Javadoc) * @see org.eclipse.jface.viewers.ITableLabelProvider#getColumnImage(java.lang.Object, int) */ @Override public Image getColumnImage(Object element, int columnIndex) { Image image = fProvider.getColumnImage(element, columnIndex); if (columnIndex == 0) { if (fDecorator != null) { if (fDecorator instanceof LabelDecorator) { LabelDecorator ld2 = (LabelDecorator) fDecorator; Image decorated = ld2.decorateImage(image, element, getDecorationContext()); if (decorated != null) { image = decorated; } } else { Image decorated = fDecorator.decorateImage(image, element); if (decorated != null) { image = decorated; } } } IFilterable decorator = adaptFilterable(element); TreePath path = getTreePath(element); if (image != null && decorator != null && path != null && TreeViewerUtil.isFiltering(viewer, path)) { image = TreeViewerUtil.getDecoratedImage(image, viewer, path); } } return image; } /** * Get the tree path whose leaf is the element. * * @param element The leaf element. * @return The tree path. */ private TreePath getTreePath(Object element) { List<Object> elements = new ArrayList<Object>(); while (element != null) { elements.add(0, element); element = getParent(element); } if (elements.isEmpty()) return TreePath.EMPTY; return new TreePath(elements.toArray()); } /** * get the parent path. * * @param element The element whose parent is being retrieved. * @return The parent element. */ private Object getParent(Object element) { if (this.contentProvider == null) { contentProvider = (ITreeContentProvider) viewer.getContentProvider(); } return contentProvider.getParent(element); } /* (non-Javadoc) * @see org.eclipse.jface.viewers.ITableLabelProvider#getColumnText(java.lang.Object, int) */ @Override public String getColumnText(Object element, int columnIndex) { String text = fProvider.getColumnText(element, columnIndex); if (columnIndex == 0) { if (fDecorator != null) { if (fDecorator instanceof LabelDecorator) { LabelDecorator ld2 = (LabelDecorator) fDecorator; String decorated = ld2.decorateText(text, element, getDecorationContext()); if (decorated != null) { text = decorated; } } else { String decorated = fDecorator.decorateText(text, element); if (decorated != null) { text = decorated; } } } IFilterable decorator = adaptFilterable(element); TreePath path = getTreePath(element); if (decorator != null && path != null && TreeViewerUtil.isFiltering(viewer, path)) { text = TreeViewerUtil.getDecoratedText(text, viewer, path); } } return text; } /* (non-Javadoc) * @see org.eclipse.jface.viewers.DecoratingLabelProvider#getImage(java.lang.Object) */ @Override public Image getImage(Object element) { Image image = super.getImage(element); IFilterable decorator = adaptFilterable(element); TreePath path = getTreePath(element); if (image != null && decorator != null && path != null && TreeViewerUtil.isFiltering(viewer, path)) { image = TreeViewerUtil.getDecoratedImage(image, viewer, path); } return image; } /* (non-Javadoc) * @see org.eclipse.jface.viewers.DecoratingLabelProvider#getText(java.lang.Object) */ @Override public String getText(Object element) { String text = super.getText(element); IFilterable decorator = adaptFilterable(element); TreePath path = getTreePath(element); if (text != null && decorator != null && path != null && TreeViewerUtil.isFiltering(viewer, path)) { text = TreeViewerUtil.getDecoratedText(text, viewer, path); } return text; } /** * Get an adapter of IFilteringLabelProvider from the specified element. * * @param element The element to get the adapter from. * @return The element's adapter or null if does not adapt to IFilteringLabelProvider. */ private IFilterable adaptFilterable(Object element) { IFilterable decorator = null; if (element instanceof IFilterable) { decorator = (IFilterable) element; } if (decorator == null && element instanceof IAdaptable) { decorator = (IFilterable) ((IAdaptable) element).getAdapter(IFilterable.class); } if (decorator == null) { decorator = (IFilterable) Platform.getAdapterManager().getAdapter(element, IFilterable.class); } return decorator; } /* (non-Javadoc) * @see org.eclipse.jface.viewers.ITableFontProvider#getFont(java.lang.Object, int) */ @Override public Font getFont(Object element, int columnIndex) { return fProvider.getFont(element, columnIndex); } /* (non-Javadoc) * @see org.eclipse.jface.viewers.ITableColorProvider#getForeground(java.lang.Object, int) */ @Override public Color getForeground(Object element, int columnIndex) { return fProvider.getForeground(element, columnIndex); } /* (non-Javadoc) * @see org.eclipse.jface.viewers.ITableColorProvider#getBackground(java.lang.Object, int) */ @Override public Color getBackground(Object element, int columnIndex) { return fProvider.getBackground(element, columnIndex); } }