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/*******************************************************************************
* Copyright (c) 2009 Wind River Systems 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers.model;
import java.util.Arrays;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelNavigateProxy;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelNavigateUpdate;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelProxy;
import org.eclipse.debug.internal.ui.viewers.model.provisional.TreeModelViewer;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ITreeSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TreePath;
/**
* Action used to navigate the model in the treemodel viewer. This action uses
* the {@link IModelNavigateProxy} to select the next or previous element in the
* model. The model determines which elements should be navigated to (e.g. next
* suspended thread).
*
* @since 3.5
*/
public class NavigateModelAction extends Action implements ISelectionChangedListener {
final private TreeModelViewer fViewer;
final private boolean fReverse;
public NavigateModelAction(TreeModelViewer viewer, boolean reverse) {
fViewer = viewer;
fReverse = reverse;
fViewer.addSelectionChangedListener(this);
update();
}
public void dispose() {
fViewer.removeSelectionChangedListener(this);
}
public void selectionChanged(SelectionChangedEvent event) {
update();
}
private void update() {
// Update the action enablement. Action should be disabled if there
// are no model proxies that support navigation.
boolean enabled = false;
ModelContentProvider contentProvider = (ModelContentProvider)fViewer.getContentProvider();
final IModelProxy[] proxies = contentProvider.getModelProxies();
for (int i = 0; i < proxies.length; i++) {
if (proxies[i] instanceof IModelNavigateProxy) {
enabled = true;
}
}
setEnabled(enabled);
}
/**
* Update class for collecting the model delta to navigate the viewer to.
*/
abstract private class ModelNavigateUpdate extends ViewerUpdateMonitor implements IModelNavigateUpdate {
final IModelNavigateProxy fModelTraversalProxy;
IModelDelta fDelta;
ModelNavigateUpdate(IModelNavigateProxy proxy, TreePath path) {
super((ModelContentProvider)fViewer.getContentProvider(),
fViewer.getInput(),
path,
path.getSegmentCount() == 0 ? fViewer.getInput() : path.getLastSegment(),
null,
fViewer.getPresentationContext());
fModelTraversalProxy = proxy;
}
public void setNextElementDelta(IModelDelta delta) {
fDelta = delta;
}
public boolean isReverse() {
return fReverse;
}
void startRequest() {
fModelTraversalProxy.update(this);
}
boolean coalesce(ViewerUpdateMonitor update) {
return false;
}
int getPriority() {
return 0;
}
TreePath getSchedulingPath() {
return getElementPath();
}
}
public void run() {
// Get the model proxy of the currently selected element.
setEnabled(false);
TreePath path = null;
final ISelection currentContext = fViewer.getSelection();
if (currentContext instanceof ITreeSelection) {
TreePath[] paths = ((ITreeSelection)currentContext).getPaths();
if (paths.length > 0 && paths[0].getSegmentCount() > 0) {
path = paths[0];
}
}
if (path == null) {
path = TreePath.EMPTY;
}
ModelContentProvider contentProvider = (ModelContentProvider)fViewer.getContentProvider();
IModelProxy selectionProxy = contentProvider.getElementProxy(path);
// Calculate the index of the current proxy.
final IModelProxy[] proxies = contentProvider.getModelProxies();
int _idx = Arrays.asList(proxies).indexOf(selectionProxy);
final int selectionProxyIdx = _idx == -1 ? 0 : _idx;
final int nextProxyIdx = getNextProxyIdx(proxies, selectionProxyIdx);
// Try traversing in the current model.
if (selectionProxy instanceof IModelNavigateProxy && !selectionProxy.isDisposed()) {
new ModelNavigateUpdate((IModelNavigateProxy)selectionProxy, path) {
protected void performUpdate() {
if (fDelta != null) {
fViewer.updateViewer(fDelta);
setEnabled(true);
} else if (proxies.length > 0) {
updateNextProxy(proxies, nextProxyIdx, nextProxyIdx, true);
} else {
setEnabled(true);
}
}
}.start();
} else if (proxies.length > 0) {
updateNextProxy(proxies, nextProxyIdx, nextProxyIdx, true);
}
}
private int getNextProxyIdx(final IModelProxy[] proxies, int currentProxyIdx) {
int _nextProxyIdx = currentProxyIdx;
if (fReverse) {
_nextProxyIdx--;
if (_nextProxyIdx < 0) {
_nextProxyIdx = proxies.length - 1;
}
} else {
_nextProxyIdx++;
if (_nextProxyIdx >= proxies.length) {
_nextProxyIdx = 0;
}
}
return _nextProxyIdx;
}
private void updateNextProxy(final IModelProxy[] proxies, final int currentProxyIdx, final int endProxyIdx, boolean start) {
IModelProxy proxy = proxies[currentProxyIdx];
if (!start && currentProxyIdx == endProxyIdx) {
// We're finished trying to find the next context
setEnabled(true);
} else if (proxy instanceof IModelNavigateProxy && !proxy.isDisposed()) {
new ModelNavigateUpdate((IModelNavigateProxy)proxy, TreePath.EMPTY) {
protected void performUpdate() {
if (fDelta != null) {
fViewer.updateViewer(fDelta);
setEnabled(true);
} else {
updateNextProxy(proxies, getNextProxyIdx(proxies, currentProxyIdx), endProxyIdx, false);
}
}
}.start();
} else {
updateNextProxy(proxies, getNextProxyIdx(proxies, currentProxyIdx), endProxyIdx, false);
}
}
}
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