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/*******************************************************************************
* Copyright (c) 2000, 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.ui.examples.javaeditor;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.text.*;
import org.eclipse.jface.viewers.*;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.views.contentoutline.ContentOutlinePage;
/**
* A content outline page which always represents the content of the
* connected editor in 10 segments.
*/
public class JavaContentOutlinePage extends ContentOutlinePage {
/**
* A segment element.
*/
protected static class Segment {
public String name;
public Position position;
public Segment(String name, Position position) {
this.name= name;
this.position= position;
}
public String toString() {
return name;
}
}
/**
* Divides the editor's document into ten segments and provides elements for them.
*/
protected class ContentProvider implements ITreeContentProvider {
protected final static String SEGMENTS= "__java_segments"; //$NON-NLS-1$
protected IPositionUpdater fPositionUpdater= new DefaultPositionUpdater(SEGMENTS);
protected List fContent= new ArrayList(10);
protected void parse(IDocument document) {
int lines= document.getNumberOfLines();
int increment= Math.max(Math.round(lines / 10), 10);
for (int line= 0; line < lines; line += increment) {
int length= increment;
if (line + increment > lines)
length= lines - line;
try {
int offset= document.getLineOffset(line);
int end= document.getLineOffset(line + length);
length= end - offset;
Position p= new Position(offset, length);
document.addPosition(SEGMENTS, p);
fContent.add(new Segment(MessageFormat.format(JavaEditorMessages.getString("OutlinePage.segment.title_pattern"), new Object[] { new Integer(offset) }), p)); //$NON-NLS-1$
} catch (BadPositionCategoryException x) {
} catch (BadLocationException x) {
}
}
}
/*
* @see IContentProvider#inputChanged(Viewer, Object, Object)
*/
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
if (oldInput != null) {
IDocument document= fDocumentProvider.getDocument(oldInput);
if (document != null) {
try {
document.removePositionCategory(SEGMENTS);
} catch (BadPositionCategoryException x) {
}
document.removePositionUpdater(fPositionUpdater);
}
}
fContent.clear();
if (newInput != null) {
IDocument document= fDocumentProvider.getDocument(newInput);
if (document != null) {
document.addPositionCategory(SEGMENTS);
document.addPositionUpdater(fPositionUpdater);
parse(document);
}
}
}
/*
* @see IContentProvider#dispose
*/
public void dispose() {
if (fContent != null) {
fContent.clear();
fContent= null;
}
}
/*
* @see IContentProvider#isDeleted(Object)
*/
public boolean isDeleted(Object element) {
return false;
}
/*
* @see IStructuredContentProvider#getElements(Object)
*/
public Object[] getElements(Object element) {
return fContent.toArray();
}
/*
* @see ITreeContentProvider#hasChildren(Object)
*/
public boolean hasChildren(Object element) {
return element == fInput;
}
/*
* @see ITreeContentProvider#getParent(Object)
*/
public Object getParent(Object element) {
if (element instanceof Segment)
return fInput;
return null;
}
/*
* @see ITreeContentProvider#getChildren(Object)
*/
public Object[] getChildren(Object element) {
if (element == fInput)
return fContent.toArray();
return new Object[0];
}
}
protected Object fInput;
protected IDocumentProvider fDocumentProvider;
protected ITextEditor fTextEditor;
/**
* Creates a content outline page using the given provider and the given editor.
*
* @param provider the document provider
* @param editor the editor
*/
public JavaContentOutlinePage(IDocumentProvider provider, ITextEditor editor) {
super();
fDocumentProvider= provider;
fTextEditor= editor;
}
/* (non-Javadoc)
* Method declared on ContentOutlinePage
*/
public void createControl(Composite parent) {
super.createControl(parent);
TreeViewer viewer= getTreeViewer();
viewer.setContentProvider(new ContentProvider());
viewer.setLabelProvider(new LabelProvider());
viewer.addSelectionChangedListener(this);
if (fInput != null)
viewer.setInput(fInput);
}
/* (non-Javadoc)
* Method declared on ContentOutlinePage
*/
public void selectionChanged(SelectionChangedEvent event) {
super.selectionChanged(event);
ISelection selection= event.getSelection();
if (selection.isEmpty())
fTextEditor.resetHighlightRange();
else {
Segment segment= (Segment) ((IStructuredSelection) selection).getFirstElement();
int start= segment.position.getOffset();
int length= segment.position.getLength();
try {
fTextEditor.setHighlightRange(start, length, true);
} catch (IllegalArgumentException x) {
fTextEditor.resetHighlightRange();
}
}
}
/**
* Sets the input of the outline page
*
* @param input the input of this outline page
*/
public void setInput(Object input) {
fInput= input;
update();
}
/**
* Updates the outline page.
*/
public void update() {
TreeViewer viewer= getTreeViewer();
if (viewer != null) {
Control control= viewer.getControl();
if (control != null && !control.isDisposed()) {
control.setRedraw(false);
viewer.setInput(fInput);
viewer.expandAll();
control.setRedraw(true);
}
}
}
}
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