TreeListDialogField.java

/*******************************************************************************
 * Copyright (c) 2008 Pierre-Antoine Grégoire.
 * 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:
 *    Pierre-Antoine Grégoire - initial API and implementation
 *******************************************************************************/
package org.org.eclipse.core.utils.platform.fields;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Tree;
import org.org.eclipse.core.utils.platform.tools.PixelConverter;


/**
 * A list with a button bar. Typical buttons are 'Add', 'Remove', 'Up' and 'Down'. List model is independend of widget creation. DialogFields controls are: Label, List and Composite containing buttons.
 */
@SuppressWarnings({"unchecked","rawtypes"})
public class TreeListDialogField extends DialogField {

	protected TreeViewer fTree;

	protected ILabelProvider fLabelProvider;

	protected TreeViewerAdapter fTreeViewerAdapter;


	protected List fElements;

	protected ViewerSorter fViewerSorter;

	protected String[] fButtonLabels;

	private Button[] fButtonControls;

	private boolean[] fButtonsEnabled;

	private int fRemoveButtonIndex;

	private int fUpButtonIndex;

	private int fDownButtonIndex;

	private Label fLastSeparator;

	private Tree fTreeControl;

	private Composite fButtonsControl;

	private ISelection fSelectionWhenEnabled;

	private ITreeListAdapter fTreeAdapter;

	private Object fParentElement;

	private int fTreeExpandLevel;

	protected int treeStyle;

	/**
	 * @param adapter
	 *            Can be <code>null</code>.
	 */

	public TreeListDialogField(ITreeListAdapter adapter, String[] buttonLabels, ILabelProvider lprovider) {
		super();
		fTreeAdapter = adapter;

		fLabelProvider = lprovider;
		fTreeViewerAdapter = new TreeViewerAdapter();
		fParentElement = this;

		fElements = new ArrayList(10);

		fButtonLabels = buttonLabels;
		if (fButtonLabels != null) {
			int nButtons = fButtonLabels.length;
			fButtonsEnabled = new boolean[nButtons];
			for (int i = 0; i < nButtons; i++) {
				fButtonsEnabled[i] = true;
			}
		}

		fTree = null;
		fTreeControl = null;
		fButtonsControl = null;

		fRemoveButtonIndex = -1;
		fUpButtonIndex = -1;
		fDownButtonIndex = -1;

		fTreeExpandLevel = 0;

		treeStyle = SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FLAT|SWT.BORDER;
	}

	/**
	 * Sets the index of the 'remove' button in the button label array passed in the constructor. The behaviour of the button marked as the 'remove' button will then behandled internally. (enable state, button invocation behaviour)
	 */
	public void setRemoveButtonIndex(int removeButtonIndex) {
		Assert.isTrue(removeButtonIndex < fButtonLabels.length);
		fRemoveButtonIndex = removeButtonIndex;
	}

	/**
	 * Sets the index of the 'up' button in the button label array passed in the constructor. The behaviour of the button marked as the 'up' button will then behandled internally. (enable state, button invocation behaviour)
	 */
	public void setUpButtonIndex(int upButtonIndex) {
		Assert.isTrue(upButtonIndex < fButtonLabels.length);
		fUpButtonIndex = upButtonIndex;
	}

	/**
	 * Sets the index of the 'down' button in the button label array passed in the constructor. The behaviour of the button marked as the 'down' button will then be handled internally. (enable state, button invocation behaviour)
	 */
	public void setDownButtonIndex(int downButtonIndex) {
		Assert.isTrue(downButtonIndex < fButtonLabels.length);
		fDownButtonIndex = downButtonIndex;
	}

	/**
	 * Sets the viewerSorter.
	 * 
	 * @param viewerSorter
	 *            The viewerSorter to set
	 */
	public void setViewerSorter(ViewerSorter viewerSorter) {
		fViewerSorter = viewerSorter;
	}

	public void setTreeExpansionLevel(int level) {
		fTreeExpandLevel = level;
		if (isOkToUse(fTreeControl) && fTreeExpandLevel > 0) {
			fTree.expandToLevel(level);
		}
	}

	// ------ adapter communication

	private void buttonPressed(int index) {
		if (!managedButtonPressed(index) && fTreeAdapter != null) {
			fTreeAdapter.customButtonPressed(this, index);
		}
	}

	/**
	 * Checks if the button pressed is handled internally
	 * 
	 * @return Returns true if button has been handled.
	 */
	protected boolean managedButtonPressed(int index) {
		if (index == fRemoveButtonIndex) {
			remove();
		} else if (index == fUpButtonIndex) {
			up();
		} else if (index == fDownButtonIndex) {
			down();
		} else {
			return false;
		}
		return true;
	}

	// ------ layout helpers

	/*
	 * @see DialogField#doFillIntoGrid
	 */
	public Control[] doFillIntoTable(Composite parent, int nColumns) {
		PixelConverter converter = new PixelConverter(parent);
		Control[] result = null;
		boolean anyButtons = true;
		if (fButtonLabels == null || fButtonLabels.length == 0) {
			anyButtons = false;
		}

		Label label = getLabelControl(parent);
		GridData gd = gridDataForLabel(1);
		gd.verticalAlignment=SWT.TOP;
		label.setLayoutData(gd);

		Control list = getTreeControl(parent);
		gd = new GridData(GridData.FILL_BOTH);
		gd.horizontalSpan = nColumns - (anyButtons?1:2);
		gd.heightHint = converter.convertHeightInCharsToPixels(6);

		list.setLayoutData(gd);

		if (anyButtons) {
			Composite buttons = getButtonBox(parent);
			gd = new GridData(GridData.FILL);
			gd.horizontalSpan = 1;
			buttons.setLayoutData(gd);
			result = new Control[] { label, list, buttons };
		} else {
			result = new Control[] { label, list };
		}
		return result;
	}

	/*
	 * @see DialogField#getNumberOfControls
	 */
	public int getNumberOfControls() {
		return 3;
	}

	/**
	 * Sets the minimal width of the buttons. Must be called after widget creation.
	 */
	public void setButtonsMinWidth(int minWidth) {
		if (fLastSeparator != null) {
			((GridData) fLastSeparator.getLayoutData()).widthHint = minWidth;
		}
	}

	// ------ ui creation

	/**
	 * Returns the tree control. When called the first time, the control will be created.
	 * 
	 * @param parent
	 *            The parent composite when called the first time, or <code>null</code> after.
	 */
	public Control getTreeControl(Composite parent) {
		if (fTreeControl == null) {
			assertCompositeNotNull(parent);

			fTree = createTreeViewer(parent);

			fTreeControl = (Tree) fTree.getControl();
			fTreeControl.addKeyListener(new KeyAdapter() {
				public void keyPressed(KeyEvent e) {
					handleKeyPressed(e);
				}
			});
			fTree.setContentProvider(fTreeViewerAdapter);
			fTree.setLabelProvider(fLabelProvider);
			fTree.addSelectionChangedListener(fTreeViewerAdapter);
			fTree.addDoubleClickListener(fTreeViewerAdapter);

			fTree.setInput(fParentElement);
			fTree.expandToLevel(fTreeExpandLevel);

			if (fViewerSorter != null) {
				fTree.setSorter(fViewerSorter);
			}

			fTreeControl.setEnabled(isEnabled());
			if (fSelectionWhenEnabled != null) {
				postSetSelection(fSelectionWhenEnabled);
			}
		}
		return fTreeControl;
	}

	/**
	 * Returns the internally used table viewer.
	 */
	public TreeViewer getTreeViewer() {
		return fTree;
	}

	/*
	 * Subclasses may override to specify a different treeStyle.
	 */
	protected int getTreeStyle() {
		return treeStyle;
	}

	protected TreeViewer createTreeViewer(Composite parent) {
		Tree tree = new Tree(parent, getTreeStyle());
		tree.setFont(parent.getFont());
		return new TreeViewer(tree);
	}

	protected Button createButton(Composite parent, String label, SelectionListener listener) {
		Button button = new Button(parent, SWT.FLAT);
		button.setFont(parent.getFont());
		button.setText(label);
		button.addSelectionListener(listener);
		GridData gd = new GridData();
		gd.horizontalAlignment = GridData.FILL;
		gd.grabExcessHorizontalSpace = true;
		gd.verticalAlignment = GridData.BEGINNING;
		button.setLayoutData(gd);
		return button;
	}

	private Label createSeparator(Composite parent) {
		Label separator = new Label(parent, SWT.SEPARATOR);
		separator.setFont(parent.getFont());
		separator.setVisible(false);
		GridData gd = new GridData();
		gd.horizontalAlignment = GridData.FILL;
		gd.verticalAlignment = GridData.BEGINNING;
		gd.heightHint = 4;
		separator.setLayoutData(gd);
		return separator;
	}

	/**
	 * Returns the composite containing the buttons. When called the first time, the control will be created.
	 * 
	 * @param parent
	 *            The parent composite when called the first time, or <code>null</code> after.
	 */
	public Composite getButtonBox(Composite parent) {
		if (fButtonsControl == null) {
			assertCompositeNotNull(parent);

			SelectionListener listener = new SelectionListener() {
				public void widgetDefaultSelected(SelectionEvent e) {
					doButtonSelected(e);
				}

				public void widgetSelected(SelectionEvent e) {
					doButtonSelected(e);
				}
			};

			Composite contents = new Composite(parent, SWT.NONE);
			contents.setFont(parent.getFont());

			GridLayout layout = new GridLayout();
			layout.marginWidth = 0;
			layout.marginHeight = 0;
			contents.setLayout(layout);

			if (fButtonLabels != null) {
				fButtonControls = new Button[fButtonLabels.length];
				for (int i = 0; i < fButtonLabels.length; i++) {
					String currLabel = fButtonLabels[i];
					if (currLabel != null) {
						fButtonControls[i] = createButton(contents, currLabel, listener);
						fButtonControls[i].setEnabled(isEnabled() && fButtonsEnabled[i]);
					} else {
						fButtonControls[i] = null;
						createSeparator(contents);
					}
				}
			}

			fLastSeparator = createSeparator(contents);

			updateButtonState();
			fButtonsControl = contents;
		}

		return fButtonsControl;
	}

	private void doButtonSelected(SelectionEvent e) {
		if (fButtonControls != null) {
			for (int i = 0; i < fButtonControls.length; i++) {
				if (e.widget == fButtonControls[i]) {
					buttonPressed(i);
					return;
				}
			}
		}
	}

	/**
	 * Handles key events in the table viewer. Specifically when the delete key is pressed.
	 */
	protected void handleKeyPressed(KeyEvent event) {
		if (event.character == SWT.DEL && event.stateMask == 0) {
			if (fRemoveButtonIndex != -1 && isButtonEnabled(fTree.getSelection(), fRemoveButtonIndex)) {
				managedButtonPressed(fRemoveButtonIndex);
				return;
			}
		}
		fTreeAdapter.keyPressed(this, event);
	}

	// ------ enable / disable management

	/*
	 * @see DialogField#dialogFieldChanged
	 */
	public void dialogFieldChanged() {
		super.dialogFieldChanged();
		updateButtonState();
	}

	/*
	 * Updates the enable state of the all buttons
	 */
	protected void updateButtonState() {
		if (fButtonControls != null) {
			ISelection sel = fTree.getSelection();
			for (int i = 0; i < fButtonControls.length; i++) {
				Button button = fButtonControls[i];
				if (isOkToUse(button)) {
					button.setEnabled(isButtonEnabled(sel, i));
				}
			}
		}
	}

	protected boolean containsAttributes(List<?> selected) {
		for (int i = 0; i < selected.size(); i++) {
			if (!fElements.contains(selected.get(i))) {
				return true;
			}
		}
		return false;
	}

	protected boolean getManagedButtonState(ISelection sel, int index) {
		List<?> selected = getSelectedElements();
		boolean hasAttributes = containsAttributes(selected);
		if (index == fRemoveButtonIndex) {
			return !selected.isEmpty() && !hasAttributes;
		} else if (index == fUpButtonIndex) {
			return !sel.isEmpty() && !hasAttributes && canMoveUp(selected);
		} else if (index == fDownButtonIndex) {
			return !sel.isEmpty() && !hasAttributes && canMoveDown(selected);
		}
		return true;
	}

	/*
	 * @see DialogField#updateEnableState
	 */
	protected void updateEnableState() {
		super.updateEnableState();

		boolean enabled = isEnabled();
		if (isOkToUse(fTreeControl)) {
			if (!enabled) {
				fSelectionWhenEnabled = fTree.getSelection();
				selectElements(null);
			} else {
				selectElements(fSelectionWhenEnabled);
				fSelectionWhenEnabled = null;
			}
			fTreeControl.setEnabled(enabled);
		}
		updateButtonState();
	}

	/**
	 * Sets a button enabled or disabled.
	 */
	public void enableButton(int index, boolean enable) {
		if (fButtonsEnabled != null && index < fButtonsEnabled.length) {
			fButtonsEnabled[index] = enable;
			updateButtonState();
		}
	}

	private boolean isButtonEnabled(ISelection sel, int index) {
		boolean extraState = getManagedButtonState(sel, index);
		return isEnabled() && extraState && fButtonsEnabled[index];
	}

	// ------ model access

	/**
	 * Sets the elements shown in the list.
	 */
	public void setElements(List elements) {
		fElements = new ArrayList(elements);
		refresh();
		if (isOkToUse(fTreeControl)) {
			fTree.expandToLevel(fTreeExpandLevel);
		}
		dialogFieldChanged();
	}

	/**
	 * Gets the elements shown in the list. The list returned is a copy, so it can be modified by the user.
	 */
	public List getElements() {
		return new ArrayList(fElements);
	}

	/**
	 * Gets the element shown at the given index.
	 */
	public Object getElement(int index) {
		return fElements.get(index);
	}

	/**
	 * Gets the index of an element in the list or -1 if element is not in list.
	 */
	public int getIndexOfElement(Object elem) {
		return fElements.indexOf(elem);
	}

	/**
	 * Replace an element.
	 */

	public void replaceElement(Object oldElement, Object newElement) throws IllegalArgumentException {
		int idx = fElements.indexOf(oldElement);
		if (idx != -1) {
			fElements.set(idx, newElement);
			if (isOkToUse(fTreeControl)) {
				List selected = getSelectedElements();
				if (selected.remove(oldElement)) {
					selected.add(newElement);
				}
				boolean isExpanded = fTree.getExpandedState(oldElement);
				fTree.remove(oldElement);
				fTree.add(fParentElement, newElement);
				if (isExpanded) {
					fTree.expandToLevel(newElement, fTreeExpandLevel);
				}
				selectElements(new StructuredSelection(selected));
			}
			dialogFieldChanged();
		} else {
			throw new IllegalArgumentException();
		}
	}

	/**
	 * Adds an element at the end of the tree list.
	 */

	public void addElement(Object element) {
		if (fElements.contains(element)) {
			return;
		}
		fElements.add(element);
		if (isOkToUse(fTreeControl)) {
			fTree.add(fParentElement, element);
			fTree.expandToLevel(element, fTreeExpandLevel);
		}
		dialogFieldChanged();
	}

	/**
	 * Adds elements at the end of the tree list.
	 */

	public void addElements(List elements) {
		int nElements = elements.size();

		if (nElements > 0) {
			// filter duplicated
			ArrayList elementsToAdd = new ArrayList(nElements);

			for (int i = 0; i < nElements; i++) {
				Object elem = elements.get(i);
				if (!fElements.contains(elem)) {
					elementsToAdd.add(elem);
				}
			}
			fElements.addAll(elementsToAdd);
			if (isOkToUse(fTreeControl)) {
				fTree.add(fParentElement, elementsToAdd.toArray());
				for (int i = 0; i < elementsToAdd.size(); i++) {
					fTree.expandToLevel(elementsToAdd.get(i), fTreeExpandLevel);
				}
			}
			dialogFieldChanged();
		}
	}

	/**
	 * Adds an element at a position.
	 */

	public void insertElementAt(Object element, int index) {
		if (fElements.contains(element)) {
			return;
		}
		fElements.add(index, element);
		if (isOkToUse(fTreeControl)) {
			fTree.add(fParentElement, element);
			if (fTreeExpandLevel != -1) {
				fTree.expandToLevel(element, fTreeExpandLevel);
			}
		}

		dialogFieldChanged();
	}

	/**
	 * Adds an element at a position.
	 */
	public void removeAllElements() {
		if (fElements.size() > 0) {
			fElements.clear();
			refresh();
			dialogFieldChanged();
		}
	}

	/**
	 * Removes an element from the list.
	 */
	public void removeElement(Object element) throws IllegalArgumentException {
		if (fElements.remove(element)) {
			if (isOkToUse(fTreeControl)) {
				fTree.remove(element);
			}
			dialogFieldChanged();
		} else {
			throw new IllegalArgumentException();
		}
	}

	/**
	 * Removes elements from the list.
	 */

	public void removeElements(List elements) {
		if (elements.size() > 0) {
			fElements.removeAll(elements);
			if (isOkToUse(fTreeControl)) {
				fTree.remove(elements.toArray());
			}
			dialogFieldChanged();
		}
	}

	/**
	 * Gets the number of elements
	 */
	public int getSize() {
		return fElements.size();
	}

	public void selectElements(ISelection selection) {
		fSelectionWhenEnabled = selection;
		if (isOkToUse(fTreeControl)) {
			fTree.setSelection(selection, true);
		}
	}

	public void selectFirstElement() {
		Object element = null;
		if (fViewerSorter != null) {
			Object[] arr = fElements.toArray();
			fViewerSorter.sort(fTree, arr);
			if (arr.length > 0) {
				element = arr[0];
			}
		} else {
			if (fElements.size() > 0) {
				element = fElements.get(0);
			}
		}
		if (element != null) {
			selectElements(new StructuredSelection(element));
		}
	}

	public void postSetSelection(final ISelection selection) {
		if (isOkToUse(fTreeControl)) {
			Display d = fTreeControl.getDisplay();
			d.asyncExec(new Runnable() {
				public void run() {
					if (isOkToUse(fTreeControl)) {
						selectElements(selection);
					}
				}
			});
		}
	}

	/**
	 * Refreshes the tree.
	 */
	public void refresh() {
		super.refresh();
		if (isOkToUse(fTreeControl)) {
			fTree.refresh();
		}
	}

	/**
	 * Refreshes the tree.
	 */
	public void refresh(Object element) {
		if (isOkToUse(fTreeControl)) {
			fTree.refresh(element);
		}
	}

	/**
	 * Updates the element.
	 */
	public void update(Object element) {
		if (isOkToUse(fTreeControl)) {
			fTree.update(element, null);
		}
	}

	// ------- list maintenance


	private List moveUp(List elements, List move) {
		int nElements = elements.size();
		List res = new ArrayList(nElements);
		Object floating = null;
		for (int i = 0; i < nElements; i++) {
			Object curr = elements.get(i);
			if (move.contains(curr)) {
				res.add(curr);
			} else {
				if (floating != null) {
					res.add(floating);
				}
				floating = curr;
			}
		}
		if (floating != null) {
			res.add(floating);
		}
		return res;
	}

	private void moveUp(List<?> toMoveUp) {
		if (toMoveUp.size() > 0) {
			setElements(moveUp(fElements, toMoveUp));
			fTree.reveal(toMoveUp.get(0));
		}
	}

	private void moveDown(List<?> toMoveDown) {
		if (toMoveDown.size() > 0) {
			setElements(reverse(moveUp(reverse(fElements), toMoveDown)));
			fTree.reveal(toMoveDown.get(toMoveDown.size() - 1));
		}
	}


	private List reverse(List p) {
		List reverse = new ArrayList(p.size());
		for (int i = p.size() - 1; i >= 0; i--) {
			reverse.add(p.get(i));
		}
		return reverse;
	}

	private void remove() {
		removeElements(getSelectedElements());
	}

	private void up() {
		moveUp(getSelectedElements());
	}

	private void down() {
		moveDown(getSelectedElements());
	}

	private boolean canMoveUp(List<?> selectedElements) {
		if (isOkToUse(fTreeControl)) {
			int nSelected = selectedElements.size();
			int nElements = fElements.size();
			for (int i = 0; i < nElements && nSelected > 0; i++) {
				if (!selectedElements.contains(fElements.get(i))) {
					return true;
				}
				nSelected--;
			}
		}
		return false;
	}

	private boolean canMoveDown(List<?> selectedElements) {
		if (isOkToUse(fTreeControl)) {
			int nSelected = selectedElements.size();
			for (int i = fElements.size() - 1; i >= 0 && nSelected > 0; i--) {
				if (!selectedElements.contains(fElements.get(i))) {
					return true;
				}
				nSelected--;
			}
		}
		return false;
	}

	/**
	 * Returns the selected elements.
	 */

	public List getSelectedElements() {
		ArrayList result = new ArrayList();
		if (isOkToUse(fTreeControl)) {
			ISelection selection = fTree.getSelection();
			if (selection instanceof IStructuredSelection) {
				Iterator iter = ((IStructuredSelection) selection).iterator();
				while (iter.hasNext()) {
					result.add(iter.next());
				}
			}
		}
		return result;
	}

	public void expandElement(Object element, int level) {
		if (isOkToUse(fTreeControl)) {
			fTree.expandToLevel(element, level);
		}
	}

	// ------- TreeViewerAdapter

	private class TreeViewerAdapter implements ITreeContentProvider, ISelectionChangedListener, IDoubleClickListener {

		private final Object[] NO_ELEMENTS = new Object[0];

		// ------- ITreeContentProvider Interface ------------

		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
			// will never happen
		}

		@SuppressWarnings("unused")
		public boolean isDeleted(Object element) {
			return false;
		}

		public void dispose() {
		}

		public Object[] getElements(Object obj) {
			return fElements.toArray();
		}

		public Object[] getChildren(Object element) {
			if (fTreeAdapter != null) {
				return fTreeAdapter.getChildren(TreeListDialogField.this, element);
			}
			return NO_ELEMENTS;
		}

		public Object getParent(Object element) {
			if (!fElements.contains(element) && fTreeAdapter != null) {
				return fTreeAdapter.getParent(TreeListDialogField.this, element);
			}
			return fParentElement;
		}

		public boolean hasChildren(Object element) {
			if (fTreeAdapter != null) {
				return fTreeAdapter.hasChildren(TreeListDialogField.this, element);
			}
			return false;
		}

		// ------- ISelectionChangedListener Interface ------------

		public void selectionChanged(SelectionChangedEvent event) {
			doListSelected(event);
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.jface.viewers.IDoubleClickListener#doubleClick(org.eclipse.jface.viewers.DoubleClickEvent)
		 */
		public void doubleClick(DoubleClickEvent event) {
			doDoubleClick(event);
		}

	}

	protected void doListSelected(SelectionChangedEvent event) {
		updateButtonState();
		if (fTreeAdapter != null) {
			fTreeAdapter.selectionChanged(this);
		}
	}

	protected void doDoubleClick(DoubleClickEvent event) {
		if (fTreeAdapter != null) {
			fTreeAdapter.doubleClicked(this);
		}
	}

	public void setTreeStyle(int treeStyle) {
		this.treeStyle = treeStyle;
	}

}