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/**
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* Copyright (C) 2018 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.preference.wizard;
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import org.eclipse.jface.viewers.AbstractTreeViewer;
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import org.eclipse.jface.viewers.CheckboxTreeViewer;
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import org.eclipse.jface.viewers.IBaseLabelProvider;
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import org.eclipse.jface.viewers.ITreeContentProvider;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.layout.GridData;
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import org.eclipse.swt.layout.GridLayout;
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import org.eclipse.swt.widgets.Composite;
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import org.eclipse.swt.widgets.Tree;
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import org.eclipse.swt.widgets.TreeItem;
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/**
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* @author pplitzner
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* @since Oct 26, 2018
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*
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*/
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public class CheckBoxTreeComposite extends Composite {
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private CheckboxTreeViewer viewer;
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private ITreeContentProvider contentProvider;
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public CheckBoxTreeComposite(Composite parent, ITreeContentProvider contentProvider, IBaseLabelProvider labelProvider, int style) {
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super(parent, style);
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this.contentProvider = contentProvider;
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Composite composite = new Composite(parent, SWT.NULL);
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composite.setLayout(new GridLayout());
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Tree tree = new Tree(parent, SWT.BORDER | SWT.CHECK);
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tree.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
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tree.addListener(SWT.Selection, event -> {
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if (event.detail == SWT.CHECK) {
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TreeItem item = (TreeItem) event.item;
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Object data = item.getData();
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boolean checked = item.getChecked();
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if(checked){
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viewer.expandToLevel(data, AbstractTreeViewer.ALL_LEVELS);
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}
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checkItems(item, checked);
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checkPath(item.getParentItem(), checked, false);
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}
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});
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viewer = new CheckboxTreeViewer(tree);
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viewer.setContentProvider(contentProvider);
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viewer.setLabelProvider(labelProvider);
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}
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private void checkPath(TreeItem item, boolean checked, boolean grayed) {
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if (item == null) {
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return;
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}
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if (grayed) {
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checked = true;
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} else {
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int index = 0;
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TreeItem[] items = item.getItems();
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while (index < items.length) {
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TreeItem child = items[index];
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if (child.getGrayed() || checked != child.getChecked()) {
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checked = grayed = true;
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break;
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}
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index++;
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}
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}
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item.setChecked(checked);
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item.setGrayed(grayed);
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checkPath(item.getParentItem(), checked, grayed);
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}
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private void checkItems(TreeItem item, boolean checked) {
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item.setGrayed(false);
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item.setChecked(checked);
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TreeItem[] items = item.getItems();
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for (int i = 0; i < items.length; i++) {
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checkItems(items[i], checked);
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}
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}
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public CheckboxTreeViewer getViewer() {
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return viewer;
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}
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/**
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* Checks the tree items corresponding to the given elements.<br>
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* @param elements
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*/
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public void setCheckedElements(Object[] elements) {
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viewer.setCheckedElements(elements);
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for (Object element : elements) {
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Object parent = contentProvider.getParent(element);
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checkPath(parent);
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}
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}
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private void checkPath(Object object){
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if(object!=null){
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checkPath(contentProvider.getParent(object));
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viewer.expandToLevel(object, 1);
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viewer.setGrayChecked(object, true);
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}
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}
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}
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