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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 java.util.Arrays;
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import java.util.List;
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import org.eclipse.jface.resource.JFaceResources;
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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.jface.viewers.ITreeSelection;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.events.SelectionEvent;
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import org.eclipse.swt.events.SelectionListener;
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import org.eclipse.swt.graphics.Font;
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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.Button;
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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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import org.eclipse.swt.widgets.Widget;
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import eu.etaxonomy.taxeditor.l10n.Messages;
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import eu.etaxonomy.taxeditor.model.ImageResources;
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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 implements SelectionListener {
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private static final Font FONT_DEFAULT = JFaceResources.getFontRegistry().get(JFaceResources.DEFAULT_FONT);
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private static final Font FONT_ITALIC = JFaceResources.getFontRegistry().getItalic(JFaceResources.DEFAULT_FONT);
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private static final Font FONT_BOLD = JFaceResources.getFontRegistry().getBold(JFaceResources.DEFAULT_FONT);
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private CheckboxTreeViewer viewer;
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private Button btnCollapse;
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private Button btnExpand;
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private Button btnSelectAllChildren;
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private Button btnSelectDirectChildren;
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private boolean allowTopLevelSelection = false;
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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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GridLayout layout = new GridLayout();
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layout.marginHeight = 0;
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setLayout(layout);
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Composite toolbar = new Composite(this, SWT.NONE);
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toolbar.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, true, false, 1, 1));
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GridLayout gl_toolbar = new GridLayout(4, false);
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gl_toolbar.horizontalSpacing = 4;
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gl_toolbar.marginHeight = 0;
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gl_toolbar.verticalSpacing = 0;
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toolbar.setLayout(gl_toolbar);
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btnCollapse = new Button(toolbar, SWT.NONE);
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btnCollapse.addSelectionListener(this);
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btnCollapse.setImage(ImageResources.getImage(ImageResources.COLLAPSE_ALL));
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btnCollapse.setToolTipText(""); //$NON-NLS-1$
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btnExpand = new Button(toolbar, SWT.NONE);
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btnExpand.addSelectionListener(this);
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btnExpand.setImage(ImageResources.getImage(ImageResources.EXPAND));
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btnExpand.setToolTipText(""); //$NON-NLS-1$
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btnSelectDirectChildren = new Button(toolbar, SWT.NONE);
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btnSelectDirectChildren.addSelectionListener(this);
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btnSelectDirectChildren.setImage(ImageResources.getImage(ImageResources.FLAT));
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btnSelectDirectChildren.setToolTipText(Messages.CheckBoxTreeComposite_SELECT_DIRECT_CHILDREN);
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btnSelectAllChildren = new Button(toolbar, SWT.NONE);
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btnSelectAllChildren.addSelectionListener(this);
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btnSelectAllChildren.setImage(ImageResources.getImage(ImageResources.HIERARCHICAL));
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btnSelectAllChildren.setToolTipText(""); //$NON-NLS-1$
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Tree tree = new Tree(this, 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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if(!allowTopLevelSelection && item.getParentItem()==null){
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// top level selection not allowed
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item.setChecked(false);
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return;
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}
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updateItem(item);
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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 updateItem(TreeItem treeItem){
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TreeItem parentItem = treeItem.getParentItem();
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if(parentItem!=null){
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updateItem(parentItem);
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}
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else{
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updateChildItems(treeItem);
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}
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}
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private void updateChildItems(TreeItem treeItem){
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treeItem.setFont(FONT_DEFAULT);
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TreeItem[] children = treeItem.getItems();
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if(children.length==0){
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return;
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}
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int checkedCount = 0;
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for (TreeItem child : children) {
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updateChildItems(child);
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if(child.getChecked()){
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if ((child.getFont().equals(FONT_BOLD)) || (child.getItems().length == 0)) {
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checkedCount++;
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}
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//some children are checked
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treeItem.setFont(FONT_ITALIC);
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}
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else if(child.getFont().equals(FONT_ITALIC)
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|| child.getFont().equals(FONT_BOLD)){
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//some children are checked
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treeItem.setFont(FONT_ITALIC);
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}
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}
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if(checkedCount==children.length){
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//all children are checked
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treeItem.setFont(FONT_BOLD);
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}
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else if(!treeItem.getFont().equals(FONT_ITALIC)){
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if(checkedCount>0){
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//some children are checked
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treeItem.setFont(FONT_ITALIC);
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}
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else{
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//no children are checked
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treeItem.setFont(FONT_DEFAULT);
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}
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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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public void setAllowTopLevelSelection(boolean allowTopLevelSelection) {
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this.allowTopLevelSelection = allowTopLevelSelection;
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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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viewer.reveal(element);
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}
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TreeItem[] rootItems = viewer.getTree().getItems();
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for (TreeItem rootItem : rootItems) {
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updateItem(rootItem);
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}
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}
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@Override
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public void widgetSelected(SelectionEvent e) {
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ITreeSelection structuredSelection = viewer.getStructuredSelection();
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Object firstElement = structuredSelection.getFirstElement();
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if(e.widget == btnCollapse){
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viewer.collapseAll();
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}
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else if(e.widget == btnExpand){
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viewer.expandToLevel(firstElement, AbstractTreeViewer.ALL_LEVELS);
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}
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else if(e.widget == btnSelectDirectChildren){
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Widget item = viewer.testFindItem(firstElement);
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if(item instanceof TreeItem){
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viewer.expandToLevel(firstElement, 1);
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TreeItem treeItem = (TreeItem) item;
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TreeItem[] childItems = treeItem.getItems();
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List<TreeItem> childItemList = Arrays.asList(childItems);
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boolean allChecked = childItemList.stream().allMatch(childItem->childItem.getChecked());
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childItemList.stream().forEach(childItem->childItem.setChecked(!allChecked));
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TreeItem parent = getRoot(treeItem);
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updateItem(parent);
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}
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}
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else if(e.widget == btnSelectAllChildren){
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Widget item = viewer.testFindItem(firstElement);
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if(item instanceof TreeItem){
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viewer.expandToLevel(firstElement, AbstractTreeViewer.ALL_LEVELS);
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viewer.setSubtreeChecked(firstElement, !((TreeItem) item).getFont().equals(FONT_BOLD));
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TreeItem parent = getRoot((TreeItem) item);
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updateItem(parent);
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((TreeItem) item).setChecked(false);
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}
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}
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}
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private TreeItem getRoot(TreeItem treeItem) {
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TreeItem parent = treeItem;
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while(parent.getParentItem()!=null){
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parent = parent.getParentItem();
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}
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return parent;
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}
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@Override
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public void widgetDefaultSelected(SelectionEvent e) {
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}
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}
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