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/*******************************************************************************
* Copyright (c) 2010, 2011 Ericsson 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:
* Ericsson - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.debug.internal.ui.commands;
import java.util.Map;
import org.eclipse.cdt.debug.core.model.IReverseToggleHandler;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IAdapterManager;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.core.IRequest;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.actions.DebugCommandHandler;
import org.eclipse.debug.ui.contexts.DebugContextEvent;
import org.eclipse.debug.ui.contexts.IDebugContextListener;
import org.eclipse.debug.ui.contexts.IDebugContextService;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.commands.ICommandService;
import org.eclipse.ui.commands.IElementUpdater;
import org.eclipse.ui.menus.UIElement;
import org.eclipse.ui.progress.WorkbenchJob;
import org.eclipse.ui.services.IEvaluationService;
/**
* Command handler to toggle reverse debugging mode
*
* @since 7.0
*/
public class ReverseToggleCommandHandler extends DebugCommandHandler implements IDebugContextListener, IElementUpdater {
@Override
protected Class<?> getCommandType() {
return IReverseToggleHandler.class;
}
//
// The below logic allows us to keep the checked state of the toggle button
// properly set. This is because in some case, the checked state may change
// without the user actually pressing the button. For instance, if we restart
// the inferior, the toggle may automatically turn off.
// To figure this out, whenever a debug context changes, we make sure we are
// showing the proper checked state.
//
// We must hard-code the command id so as to know it from the very start (bug 290699)
private static final String REVERSE_TOGGLE_COMMAND_ID = "org.eclipse.cdt.debug.ui.command.reverseToggle"; //$NON-NLS-1$
private Object fActiveContext = null;
private IReverseToggleHandler fTargetAdapter = null;
private IDebugContextService fContextService = null;
public ReverseToggleCommandHandler() {
IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
if (window != null) {
fContextService = DebugUITools.getDebugContextManager().getContextService(window);
if (fContextService != null) {
fContextService.addPostDebugContextListener(this);
// This constructor might be called after the launch, so we must refresh here too.
// This can happen if we activate the action set after the launch.
refresh(fContextService.getActiveContext());
}
}
}
@Override
public void dispose() {
// Must use the stored context service. If we try to fetch the service
// again with the workbenchWindow, it may fail if the window is
// already closed.
if (fContextService != null) {
fContextService.removePostDebugContextListener(this);
}
fTargetAdapter = null;
fActiveContext = null;
super.dispose();
}
@Override
public void debugContextChanged(DebugContextEvent event) {
refresh(event.getContext());
}
private void refresh(ISelection selection) {
fTargetAdapter = null;
fActiveContext = null;
if (selection instanceof IStructuredSelection) {
IStructuredSelection ss = (IStructuredSelection) selection;
if (!ss.isEmpty()) {
fActiveContext = ss.getFirstElement();
if (fActiveContext instanceof IAdaptable) {
fTargetAdapter = getAdapter((IAdaptable) fActiveContext);
}
}
}
ICommandService commandService = (ICommandService) PlatformUI.getWorkbench().getService(ICommandService.class);
if (commandService != null) {
commandService.refreshElements(REVERSE_TOGGLE_COMMAND_ID, null);
}
}
private IReverseToggleHandler getAdapter(IAdaptable adaptable) {
IReverseToggleHandler adapter = (IReverseToggleHandler)adaptable.getAdapter(IReverseToggleHandler.class);
if (adapter == null) {
IAdapterManager adapterManager = Platform.getAdapterManager();
if (adapterManager.hasAdapter(adaptable, getCommandType().getName())) {
adapter = (IReverseToggleHandler)adapterManager.loadAdapter(adaptable, IReverseToggleHandler.class.getName());
}
}
return adapter;
}
/*
* (non-Javadoc)
* @see org.eclipse.debug.ui.actions.DebugCommandHandler#postExecute(org.eclipse.debug.core.IRequest, java.lang.Object[])
*
* We keep this logic for users that may not do the refresh themselves.
*/
@Override
protected void postExecute(IRequest request, Object[] targets) {
super.postExecute(request, targets);
new WorkbenchJob("") { //$NON-NLS-1$
@Override
public IStatus runInUIThread(IProgressMonitor monitor) {
// Request re-evaluation of property "org.eclipse.cdt.debug.ui.isReverseDebuggingEnabled" to update
// visibility of reverse stepping commands.
IEvaluationService exprService = (IEvaluationService) PlatformUI.getWorkbench().getService(IEvaluationService.class);
if (exprService != null) {
exprService.requestEvaluation("org.eclipse.cdt.debug.ui.isReverseDebuggingEnabled"); //$NON-NLS-1$
}
// Refresh reverse toggle commands with the new state of reverse enabled.
// This is in order to keep multiple toggle actions in UI in sync.
ICommandService commandService = (ICommandService) PlatformUI.getWorkbench().getService(ICommandService.class);
if (commandService != null) {
commandService.refreshElements(REVERSE_TOGGLE_COMMAND_ID, null);
}
return Status.OK_STATUS;
}
}.schedule();
}
@Override
public void updateElement(UIElement element,
@SuppressWarnings("rawtypes") Map parameters) {
// Make sure the toggle state reflects the actual state
// We must check this, in case we have multiple launches
// or if we re-launch (restart)
if (fTargetAdapter != null && fTargetAdapter.toggleNeedsUpdating()){
boolean toggled = fTargetAdapter.isReverseToggled(fActiveContext);
element.setChecked(toggled);
}
}
}
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