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/*******************************************************************************
* Copyright (c) 2006, 2007 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.ui.internal.selection;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.IPostSelectionProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jpt.core.internal.IJpaFile;
import org.eclipse.jpt.core.internal.ITextRange;
import org.eclipse.jpt.core.internal.JptCorePlugin;
import org.eclipse.jpt.core.internal.context.base.IJpaStructureNode;
import org.eclipse.jpt.ui.internal.views.AbstractJpaView;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IPropertyListener;
import org.eclipse.ui.texteditor.ITextEditor;
public class TextEditorSelectionParticipant
implements IJpaSelectionParticipant
{
private final IJpaSelectionManager selectionManager;
final ITextEditor textEditor;
private final IPropertyListener editorInputListener;
private final ISelectionChangedListener editorSelectionListener;
private IJpaSelection currentSelection;
private boolean forwardSelection = true; // TODO this just smells wrong ~bjv
public TextEditorSelectionParticipant(IJpaSelectionManager selectionManager, ITextEditor textEditor) {
super();
this.selectionManager = selectionManager;
this.textEditor = textEditor;
this.editorInputListener = new EditorInputListener();
this.textEditor.addPropertyListener(this.editorInputListener);
this.editorSelectionListener = new EditorSelectionListener();
this.postSelectionProvider().addPostSelectionChangedListener(this.editorSelectionListener);
this.currentSelection = this.calculateSelection();
}
// ********** IJpaSelectionParticipant implementation **********
public IJpaSelection getSelection() {
return this.currentSelection;
}
public void selectionChanged(JpaSelectionEvent evt) {
IJpaSelection newSelection = evt.getSelection();
if ((newSelection == IJpaSelection.NULL_SELECTION)
|| newSelection.equals(this.currentSelection)) {
return;
}
this.forwardSelection = false;
ITextRange textRange = newSelection.getSelectedNode().selectionTextRange();
if (textRange != null) {
this.textEditor.selectAndReveal(textRange.getOffset(), textRange.getLength());
}
this.forwardSelection = true;
}
public boolean disposeOnHide() {
return true;
}
public void dispose() {
this.textEditor.removePropertyListener(this.editorInputListener);
this.postSelectionProvider().removePostSelectionChangedListener(this.editorSelectionListener);
}
// ********** internal methods **********
private IJpaSelection calculateSelection() {
ISelection selection = this.textEditor.getSelectionProvider().getSelection();
if (! (selection instanceof ITextSelection)) {
return IJpaSelection.NULL_SELECTION;
}
IJpaFile jpaFile = this.jpaFile();
if (jpaFile == null) {
return IJpaSelection.NULL_SELECTION;
}
IJpaStructureNode selectedNode = jpaFile.structureNode(((ITextSelection) selection).getOffset());
if (selectedNode == null) {
return IJpaSelection.NULL_SELECTION;
}
return new JpaSelection(selectedNode);
}
private IJpaFile jpaFile() {
IEditorInput input = this.textEditor.getEditorInput();
if ( ! (input instanceof IFileEditorInput)) {
return null;
}
return JptCorePlugin.jpaFile(((IFileEditorInput) input).getFile());
}
private IPostSelectionProvider postSelectionProvider() {
return (IPostSelectionProvider) this.textEditor.getSelectionProvider();
}
// ********** listener callbacks **********
void editorInputChanged() {
IJpaSelection newSelection = this.calculateSelection();
if (newSelection.equals(this.currentSelection)) {
return;
}
this.currentSelection = newSelection;
if (this.forwardSelection) {
this.selectionManager.select(newSelection);
}
}
void editorSelectionChanged(SelectionChangedEvent event) {
IJpaSelection newSelection = this.calculateSelection();
if (newSelection.equals(this.currentSelection)) {
return;
}
this.currentSelection = newSelection;
// bug 188344 - won't actively change selection manager selection if
// a "JPA" view is the active (and presumably selecting) view
if (this.textEditor.getEditorSite().getPage().getActivePart() instanceof AbstractJpaView) {
return;
}
if (this.forwardSelection) {
this.selectionManager.select(newSelection);
}
}
// ********** listeners **********
private class EditorInputListener implements IPropertyListener {
EditorInputListener() {
super();
}
public void propertyChanged(Object source, int propId) {
if ((source == TextEditorSelectionParticipant.this.textEditor)
&& (propId == IEditorPart.PROP_INPUT)) {
TextEditorSelectionParticipant.this.editorInputChanged();
}
}
}
private class EditorSelectionListener implements ISelectionChangedListener {
EditorSelectionListener() {
super();
}
public void selectionChanged(SelectionChangedEvent event) {
TextEditorSelectionParticipant.this.editorSelectionChanged(event);
}
}
}
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