/*******************************************************************************
* Copyright (c) 2007, 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.cdt.dsf.ui.viewmodel.update;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import org.eclipse.cdt.dsf.debug.ui.IDsfDebugUIConstants;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IChildrenCountUpdate;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IChildrenUpdate;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IElementContentProvider;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IElementLabelProvider;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IHasChildrenUpdate;
import org.eclipse.debug.internal.ui.viewers.model.provisional.ILabelUpdate;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.swt.graphics.RGB;
/**
* An "manual" update policy which causes the view model provider cache to be
* flushed only as a result of an explicit user action.
*
* @since 1.0
*/
public class ManualUpdatePolicy implements IVMUpdatePolicy {
public static String MANUAL_UPDATE_POLICY_ID = "org.eclipse.cdt.dsf.ui.viewmodel.update.manualUpdatePolicy"; //$NON-NLS-1$
public static Object REFRESH_EVENT = new Object();
private static class BlankDataElement implements IElementContentProvider, IElementLabelProvider {
public void update(IHasChildrenUpdate[] updates) {
for (IHasChildrenUpdate update : updates) {
update.setHasChilren(false);
update.done();
}
}
public void update(IChildrenCountUpdate[] updates) {
for (IChildrenCountUpdate update : updates) {
update.setChildCount(0);
update.done();
}
}
public void update(IChildrenUpdate[] updates) {
for (IChildrenUpdate update : updates) {
update.done();
}
}
public void update(ILabelUpdate[] updates) {
RGB staleDataForeground = JFaceResources.getColorRegistry().getRGB(
IDsfDebugUIConstants.PREF_COLOR_STALE_DATA_FOREGROUND);
RGB staleDataBackground = JFaceResources.getColorRegistry().getRGB(
IDsfDebugUIConstants.PREF_COLOR_STALE_DATA_BACKGROUND);
for (ILabelUpdate update : updates) {
update.setLabel(ViewModelUpdateMessages.ManualUpdatePolicy_InitialDataElement__label, 0);
// Set the stale data color to the label. Use foreground color if column modes are enabled, and
// background color when there are no columns.
if (update.getColumnIds() != null) {
update.setForeground(staleDataForeground, 0);
} else {
update.setBackground(staleDataBackground, 0);
}
update.done();
}
}
}
private static class UserEditEventUpdateTester implements IElementUpdateTester {
private final Set<Object> fElements;
public UserEditEventUpdateTester(Set<Object> elements) {
fElements = elements;
}
public int getUpdateFlags(Object viewerInput, TreePath path) {
if (fElements.contains(viewerInput)) {
return FLUSH;
}
for (int i = 0; i < path.getSegmentCount(); i++) {
if (fElements.contains(path.getSegment(i))) {
return FLUSH;
}
}
return 0;
}
public boolean includes(IElementUpdateTester tester) {
return
tester instanceof UserEditEventUpdateTester &&
fElements.equals(((UserEditEventUpdateTester)tester).fElements);
}
@Override
public String toString() {
return "Edit (" + fElements + ") update tester"; //$NON-NLS-1$ //$NON-NLS-2$
}
}
private static IElementUpdateTester fgUpdateTester = new IElementUpdateTester() {
public int getUpdateFlags(Object viewerInput, TreePath path) {
return DIRTY;
}
public boolean includes(IElementUpdateTester tester) {
return tester.equals(this);
}
@Override
public String toString() {
return "Manual (refresh = false) update tester"; //$NON-NLS-1$
}
};
private static IElementUpdateTester fgRefreshUpdateTester = new IElementUpdateTester() {
public int getUpdateFlags(Object viewerInput, TreePath path) {
return FLUSH | ARCHIVE;
}
public boolean includes(IElementUpdateTester tester) {
return tester.equals(this) || tester.equals(fgUpdateTester) || tester instanceof UserEditEventUpdateTester;
}
@Override
public String toString() {
return "Manual (refresh = true) update tester"; //$NON-NLS-1$
}
};
public String getID() {
return MANUAL_UPDATE_POLICY_ID;
}
public String getName() {
return ViewModelUpdateMessages.ManualUpdatePolicy_name;
}
public IElementUpdateTester getElementUpdateTester(Object event) {
if (event.equals(REFRESH_EVENT)) {
return fgRefreshUpdateTester;
} else if (event instanceof UserEditEvent) {
return new UserEditEventUpdateTester(((UserEditEvent)event).getElements());
}
return fgUpdateTester;
}
public Object[] getInitialRootElementChildren(Object rootElement) {
// Return an dummy element to show in the view. The user will
// need to refresh the view to retrieve this data from the model.
return new Object[] { new BlankDataElement() };
}
public Map<String, Object> getInitialRootElementProperties(Object rootElement) {
// Return an empty set of properties for the root element. The user will
// need to refresh the view to retrieve this data from the model.
return Collections.emptyMap();
}
}