/*******************************************************************************
 * Copyright (c) 2006, 2018 Tom Schindl and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Tom Schindl - initial API and implementation
 *     Jeanderson Candido <http://jeandersonbc.github.io> - Bug 414565
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 475361, 489234
 *******************************************************************************/

package org.eclipse.jface.snippets.viewers;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.CheckboxCellEditor;
import org.eclipse.jface.viewers.ColumnLabelProvider;
import org.eclipse.jface.viewers.ColumnViewerEditor;
import org.eclipse.jface.viewers.ColumnViewerEditorActivationEvent;
import org.eclipse.jface.viewers.ColumnViewerEditorActivationStrategy;
import org.eclipse.jface.viewers.EditingSupport;
import org.eclipse.jface.viewers.FocusCellOwnerDrawHighlighter;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.TreeViewerColumn;
import org.eclipse.jface.viewers.TreeViewerEditor;
import org.eclipse.jface.viewers.TreeViewerFocusCellManager;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.jface.viewers.ViewerRow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

/**
 * Demonstrate how to work-around 3.3.1 limitation when it comes to TAB-Traversal and
 * checkbox editors. 3.4 will hopefully provide provide an out-of-the-box fix see bug 198502
 *
 * @author Tom Schindl &lt;tom.schindl@bestsolution.at&gt;
 */
public class Snippet048TreeViewerTabWithCheckboxFor3_3 {
	public Snippet048TreeViewerTabWithCheckboxFor3_3(final Shell shell) {
		final TreeViewer v = new TreeViewer(shell, SWT.BORDER
				| SWT.FULL_SELECTION);
		v.getTree().setLinesVisible(true);
		v.getTree().setHeaderVisible(true);

		final TreeViewerFocusCellManager mgr = new TreeViewerFocusCellManager(v,new FocusCellOwnerDrawHighlighter(v));
		ColumnViewerEditorActivationStrategy actSupport = new ColumnViewerEditorActivationStrategy(v) {
			@Override
			protected boolean isEditorActivationEvent(
					ColumnViewerEditorActivationEvent event) {
				return event.eventType == ColumnViewerEditorActivationEvent.TRAVERSAL
						|| event.eventType == ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION
						|| (event.eventType == ColumnViewerEditorActivationEvent.KEY_PRESSED && ( event.keyCode == SWT.CR || event.character == ' ' ))
						|| event.eventType == ColumnViewerEditorActivationEvent.PROGRAMMATIC;
			}
		};

		TreeViewerEditor.create(v, mgr, actSupport, ColumnViewerEditor.TABBING_HORIZONTAL
				| ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR
				| ColumnViewerEditor.TABBING_VERTICAL | ColumnViewerEditor.KEYBOARD_ACTIVATION);

		final TextCellEditor textCellEditor = new TextCellEditor(v.getTree());
		final CheckboxCellEditor checkboxCellEditor = new CheckboxCellEditor(v.getTree());

		TreeViewerColumn column = new TreeViewerColumn(v, SWT.NONE);
		column.getColumn().setWidth(200);
		column.getColumn().setMoveable(true);
		column.getColumn().setText("Column 1");
		column.setLabelProvider(new ColumnLabelProvider() {

			@Override
			public String getText(Object element) {
				return "Column 1 => " + element;
			}

		});
		column.setEditingSupport(new EditingSupport(v) {
			@Override
			protected boolean canEdit(Object element) {
				return false;
			}

			@Override
			protected CellEditor getCellEditor(Object element) {
				return textCellEditor;
			}

			@Override
			protected Object getValue(Object element) {
				return ((MyModel) element).counter + "";
			}

			@Override
			protected void setValue(Object element, Object value) {
				((MyModel) element).counter = Integer
						.parseInt(value.toString());
				v.update(element, null);
			}
		});

		column = new TreeViewerColumn(v, SWT.NONE);
		column.getColumn().setWidth(200);
		column.getColumn().setMoveable(true);
		column.getColumn().setText("Column 2");
		column.setLabelProvider(new ColumnLabelProvider() {

			@Override
			public String getText(Object element) {
				return "Column 2 => " + element;
			}

		});
		column.setEditingSupport(new EditingSupport(v) {
			@Override
			protected boolean canEdit(Object element) {
				return true;
			}

			@Override
			protected CellEditor getCellEditor(Object element) {
				return textCellEditor;
			}

			@Override
			protected Object getValue(Object element) {
				return ((MyModel) element).counter + "";
			}

			@Override
			protected void setValue(Object element, Object value) {
				((MyModel) element).counter = Integer
				.parseInt(value.toString());
				v.update(element, null);
			}
		});

		column = new TreeViewerColumn(v, SWT.NONE);
		column.getColumn().setWidth(200);
		column.getColumn().setMoveable(true);
		column.getColumn().setText("Column 3");
		column.setLabelProvider(new ColumnLabelProvider() {

			@Override
			public String getText(Object element) {
				return ((MyModel)element).bool + "";
			}

		});
		column.setEditingSupport(new EditingSupport(v) {
			@Override
			protected boolean canEdit(Object element) {
				return true;
			}

			@Override
			protected CellEditor getCellEditor(Object element) {
				return checkboxCellEditor;
			}

			@Override
			protected Object getValue(Object element) {
				return Boolean.valueOf(((MyModel) element).bool);
			}

			@Override
			protected void setValue(Object element, Object value) {
				((MyModel) element).bool = ((Boolean)value).booleanValue();
				v.update(element, null);
			}
		});

		v.setContentProvider(new MyContentProvider());
		v.setInput(createModel());
		v.getControl().addTraverseListener(e -> {
			if( (e.detail == SWT.TRAVERSE_TAB_NEXT || e.detail == SWT.TRAVERSE_TAB_PREVIOUS) && mgr.getFocusCell().getColumnIndex() == 2 ) {
				ColumnViewerEditor editor = v.getColumnViewerEditor();
				ViewerCell cell = mgr.getFocusCell();

				try {
					Method m = ColumnViewerEditor.class.getDeclaredMethod("processTraverseEvent", new Class[] {int.class,ViewerRow.class,TraverseEvent.class});
					m.setAccessible(true);
					m.invoke(editor, Integer.valueOf(cell.getColumnIndex()), cell.getViewerRow(), e);
				} catch (SecurityException | NoSuchMethodException | IllegalArgumentException | IllegalAccessException | InvocationTargetException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
			}
		});
	}

	private MyModel createModel() {

		MyModel root = new MyModel(0, null);
		root.counter = 0;

		MyModel tmp;
		MyModel subItem;
		for (int i = 1; i < 10; i++) {
			tmp = new MyModel(i, root);
			root.child.add(tmp);
			for (int j = 1; j < i; j++) {
				subItem = new MyModel(j, tmp);
				subItem.child.add(new MyModel(j * 100, subItem));
				tmp.child.add(subItem);
			}
		}

		return root;
	}

	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());
		new Snippet048TreeViewerTabWithCheckboxFor3_3(shell);
		shell.open();

		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}

		display.dispose();
	}

	private static class MyContentProvider implements ITreeContentProvider {

		@Override
		public Object[] getElements(Object inputElement) {
			return ((MyModel) inputElement).child.toArray();
		}

		@Override
		public void dispose() {
		}

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

		@Override
		public Object[] getChildren(Object parentElement) {
			return getElements(parentElement);
		}

		@Override
		public Object getParent(Object element) {
			if (element == null) {
				return null;
			}
			return ((MyModel) element).parent;
		}

		@Override
		public boolean hasChildren(Object element) {
			return ((MyModel) element).child.size() > 0;
		}

	}

	public static class MyModel {

		public MyModel parent;
		public List<MyModel> child = new ArrayList<>();
		public int counter;
		public boolean bool;

		public MyModel(int counter, MyModel parent) {
			this.parent = parent;
			this.counter = counter;
		}

		@Override
		public String toString() {
			String rv = "Item ";
			if (parent != null) {
				rv = parent + ".";
			}
			rv += counter;

			return rv;
		}
	}

}