/*******************************************************************************
* Copyright (c) 2004, 2008 Tasktop Technologies 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:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.dltk.internal.mylyn;
import java.util.Iterator;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.dltk.core.IMethod;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.core.IPackageDeclaration;
import org.eclipse.dltk.core.IType;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.internal.mylyn.search.DLTKImplementorsProvider;
import org.eclipse.dltk.internal.mylyn.search.DLTKReferencesProvider;
import org.eclipse.dltk.internal.ui.actions.SelectionConverter;
import org.eclipse.jface.text.TextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.mylyn.commons.core.StatusHandler;
import org.eclipse.mylyn.monitor.ui.AbstractUserInteractionMonitor;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPart;
/**
* @author Mik Kersten
*/
public class DLTKEditingMonitor extends AbstractUserInteractionMonitor {
protected IModelElement lastSelectedElement = null;
protected IModelElement lastResolvedElement = null;
protected IEditorPart currentEditor;
protected StructuredSelection currentSelection = null;
public DLTKEditingMonitor() {
super();
}
/**
* Only public for testing. Note: Two sequential selections on the same element are deemed to be an edit of the
* selection as this is the best guess that can be made. See bug 252306.
*/
@Override
public void handleWorkbenchPartSelection(IWorkbenchPart part, ISelection selection, boolean contributeToContext) {
try {
IModelElement selectedElement = null;
if (selection instanceof StructuredSelection) {
StructuredSelection structuredSelection = (StructuredSelection) selection;
if (structuredSelection.equals(currentSelection)) {
return;
}
currentSelection = structuredSelection;
for (Iterator<?> iterator = structuredSelection.iterator(); iterator.hasNext();) {
Object selectedObject = iterator.next();
if (selectedObject instanceof IModelElement) {
IModelElement checkedElement = checkIfAcceptedAndPromoteIfNecessary((IModelElement) selectedObject);
if (checkedElement == null) {
return;
} else {
selectedElement = checkedElement;
}
}
if (selectedElement != null) {
super.handleElementSelection(part, selectedElement, contributeToContext);
}
}
} else {
if (selection instanceof TextSelection && part instanceof IEditorPart) {
currentEditor = (IEditorPart) part;
TextSelection textSelection = (TextSelection) selection;
selectedElement = SelectionConverter.resolveEnclosingElement(currentEditor, textSelection);
if (selectedElement instanceof IPackageDeclaration) {
// HACK: ignoring these selections
return;
}
IModelElement[] resolved = SelectionConverter.codeResolve(currentEditor);
if (resolved != null && resolved.length == 1 && !resolved[0].equals(selectedElement)) {
lastResolvedElement = resolved[0];
}
boolean selectionResolved = false;
if (selectedElement instanceof IMethod && lastSelectedElement instanceof IMethod) {
// navigation between two elements
if (lastResolvedElement != null && lastSelectedElement != null
&& lastResolvedElement.equals(selectedElement)
&& !lastSelectedElement.equals(lastResolvedElement)) {
super.handleNavigation(part, selectedElement, DLTKReferencesProvider.ID,
contributeToContext);
selectionResolved = true;
} else if (lastSelectedElement != null && lastSelectedElement.equals(lastResolvedElement)
&& !lastSelectedElement.equals(selectedElement)) {
super.handleNavigation(part, selectedElement, DLTKReferencesProvider.ID,
contributeToContext);
selectionResolved = true;
}
} else if (selectedElement != null && lastSelectedElement != null
&& !lastSelectedElement.equals(selectedElement)) {
if (lastSelectedElement.getElementName().equals(selectedElement.getElementName())) {
// navigation between two elements
if (selectedElement instanceof IMethod && lastSelectedElement instanceof IMethod) {
super.handleNavigation(part, selectedElement, DLTKImplementorsProvider.ID,
contributeToContext);
selectionResolved = true;
} else if (selectedElement instanceof IType && lastSelectedElement instanceof IType) {
super.handleNavigation(part, selectedElement, DLTKImplementorsProvider.ID,
contributeToContext);
selectionResolved = true;
}
}
}
if (selectedElement != null) {
// selection of an element
if (!selectionResolved && selectedElement.equals(lastSelectedElement)) {
super.handleElementEdit(part, selectedElement, contributeToContext);
} else if (!selectedElement.equals(lastSelectedElement)) {
super.handleElementSelection(part, selectedElement, contributeToContext);
}
}
IModelElement checkedElement = checkIfAcceptedAndPromoteIfNecessary(selectedElement);
if (checkedElement == null) {
return;
} else {
selectedElement = checkedElement;
}
}
}
if (selectedElement != null) {
lastSelectedElement = selectedElement;
}
} catch (ModelException e) {
// ignore, fine to fail to resolve an element if the model is not up-to-date
} catch (Throwable t) {
StatusHandler.log(new Status(IStatus.ERROR, DLTKUiBridgePlugin.ID_PLUGIN,
"Failed to update model based on selection", t)); //$NON-NLS-1$
}
}
/**
* @return null for elements that aren't modeled
*/
protected IModelElement checkIfAcceptedAndPromoteIfNecessary(IModelElement element) {
// if (element instanceof IPackageDeclaration) return null;
// if (element instanceof IImportContainer) {
// return element.getParent();
// } else if (element instanceof IImportDeclaration) {
// return element.getParent().getParent();
// } else {
return element;
// }
}
}