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/*******************************************************************************
* Copyright (c) 2001, 2004 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.xsd.ui.internal.dialogs.types;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class SetTypeTreeView {
private TreeViewer treeViewer;
private TypesDialogTreeObject rootTreeObject;
private HashMap expansionStateMap;
public SetTypeTreeView(Composite base, String stringLabel) {
Label label = new Label(base, SWT.NONE);
label.setText(stringLabel);
treeViewer = new TreeViewer(new Tree(base, SWT.SINGLE | SWT.BORDER));
treeViewer.setContentProvider(new TreeObjectContentProvider());
treeViewer.setLabelProvider(new TreeObjectLabelProvider());
Control treeWidget = treeViewer.getTree();
GridData gd = new GridData(GridData.FILL_BOTH);
treeWidget.setLayoutData(gd);
expansionStateMap = new HashMap();
}
public void setInput(TypesDialogTreeObject input) {
rootTreeObject = input;
treeViewer.setInput(input);
treeViewer.refresh();
}
/*
* Take a snapshot of the current expansion state. We will use this
* snapshot to restore the expanded state of TreeViewer based on the new input.
* Usage: setTypeTreeView.storeExpansionState()
* setTypeTreeView.setInput(input);
* setTypeTreeView.restoreExpansionState()
*/
public void storeExpansionState() {
// Easy to record expansion state since expansion should only
// occur at the 'top' level
if (rootTreeObject != null) {
expansionStateMap = new HashMap(rootTreeObject.getChildren().size());
Iterator childrenIt = rootTreeObject.getChildren().iterator();
while (childrenIt.hasNext()) {
TypesDialogTreeObject item = (TypesDialogTreeObject) childrenIt.next();
expansionStateMap.put(item.getDataObject(), isExpanded(item));
}
}
}
public void restoreExpansionState() {
Iterator childrenIt = rootTreeObject.getChildren().iterator();
while (childrenIt.hasNext()) {
TypesDialogTreeObject item = (TypesDialogTreeObject) childrenIt.next();
Boolean expand = (Boolean) expansionStateMap.get(item.getDataObject());
if (expand == Boolean.TRUE) {
TreeItem treeItem = getTreeItem(item);
if (treeItem != null && treeItem.getItemCount() > 0) {
// Expand the TreeItem by calling showItem() on the first child of TreeItem
treeViewer.getTree().showItem(treeItem.getItems()[0]);
}
}
}
}
private Boolean isExpanded(TypesDialogTreeObject item) {
TreeItem treeItem = getTreeItem(item);
return Boolean.valueOf(treeItem.getExpanded());
}
private TreeItem getTreeItem(TreeItem root, TypesDialogTreeObject item) {
TreeItem treeItem = null;
if (root.getData().equals(item)) {
treeItem = root;
}
else {
// Check it's children
TreeItem items[] = root.getItems();
for (int index = 0; index < items.length; index++) {
if (items[index].getData() != null) {
treeItem = getTreeItem(items[index], item);
if (treeItem != null) {
break;
}
}
}
}
return treeItem;
}
public TreeItem getTreeItem(TypesDialogTreeObject item) {
boolean found = false;
TreeItem treeItem = null;
TreeItem treeItems[] = treeViewer.getTree().getItems();
for (int index = 0; index < treeItems.length; index++) {
if (treeItems[index].getData() != null) {
treeItem = getTreeItem(treeItems[index], item);
if (treeItem != null) {
break;
}
}
}
return treeItem;
}
public TypesDialogTreeObject getSelection() {
return (TypesDialogTreeObject) ((StructuredSelection) treeViewer.getSelection()).getFirstElement();
}
public void selectTreeObject(TypesDialogTreeObject selectionObject) {
if (selectionObject != null) {
StructuredSelection structuredSelection = new StructuredSelection(selectionObject);
treeViewer.setSelection(structuredSelection, true);
}
}
public void expandAll() {
treeViewer.expandAll();
}
public void setRedraw(boolean redraw) {
treeViewer.getTree().setRedraw(redraw);
}
/*
* Select the first TypesDialogTreeObject avaliable (where the TypesDialogTreeObject is not a direct
* child of the input (rootTreeObject). For example, select the first avaliable
* Complex or Simple type. Not the Headings)
*/
public void selectFirstItem() {
Iterator rootChildren = rootTreeObject.getChildren().iterator();
while (rootChildren.hasNext()) {
TypesDialogTreeObject rootChild = (TypesDialogTreeObject) rootChildren.next();
if (rootChild.getChildren().size() > 0) {
selectTreeObject((TypesDialogTreeObject) rootChild.getChildren().get(0));
break;
}
}
}
public void addTreeSelectionChangedListener(ISelectionChangedListener listener) {
treeViewer.addSelectionChangedListener(listener);
}
/////////////////////////////////////////////////////////////////////////
/*
* TreeContentProvider for TypesDialogTreeObject.java
*/
private class TreeObjectContentProvider implements ITreeContentProvider {
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
}
public Object[] getElements(Object inputElement) {
if (inputElement instanceof TypesDialogTreeObject) {
return ((TypesDialogTreeObject) inputElement).getChildren().toArray();
}
return (new ArrayList()).toArray();
}
public void dispose() {
}
public Object[] getChildren(Object parentElement) {
if (parentElement instanceof TypesDialogTreeObject) {
return ((TypesDialogTreeObject) parentElement).getChildren().toArray();
}
return (new ArrayList()).toArray();
}
public Object getParent(Object element) {
if (element instanceof TypesDialogTreeObject) {
return ((TypesDialogTreeObject) element).getParent();
}
return null;
}
public boolean hasChildren(Object element) {
if (element instanceof TypesDialogTreeObject) {
if (((TypesDialogTreeObject) element).getChildren().size() > 0) {
return true;
}
}
return false;
}
}
/*
* TreeLabelProvider for TypesDialogTreeObject.java
*/
private class TreeObjectLabelProvider extends LabelProvider {
public Image getImage(Object element) {
if (element instanceof TypesDialogTreeObject) {
return ((TypesDialogTreeObject) element).getImage();
}
return null;
}
public String getText(Object element) {
if (element instanceof TypesDialogTreeObject) {
return ((TypesDialogTreeObject) element).getEntireLabel();
}
return null;
}
}
}
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