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/*******************************************************************************
* Copyright (c) 2000, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Wind River Systems - integration with non-standard debug models (Bug 209883)
*******************************************************************************/
package org.eclipse.debug.internal.ui.actions.expressions;
import java.util.Iterator;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.debug.core.DebugEvent;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.IDebugEventSetListener;
import org.eclipse.debug.core.model.IWatchExpression;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Event;
import org.eclipse.ui.IActionDelegate2;
import org.eclipse.ui.IViewActionDelegate;
import org.eclipse.ui.IViewPart;
/**
*
*/
public class EnableWatchExpressionAction implements IViewActionDelegate, IActionDelegate2, IDebugEventSetListener {
private ISelection fSelection;
private IAction fAction;
protected boolean fEnable= true;
/* (non-Javadoc)
* @see org.eclipse.ui.IViewActionDelegate#init(org.eclipse.ui.IViewPart)
*/
@Override
public void init(IViewPart view) {
DebugPlugin.getDefault().addDebugEventListener(this);
}
/**
* @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
*/
@Override
public void run(IAction action) {
if (fSelection instanceof IStructuredSelection) {
Iterator<?> iter = ((IStructuredSelection) fSelection).iterator();
IWatchExpression expression;
while (iter.hasNext()) {
expression= getWatchExpression(iter.next());
if (expression != null) {
expression.setEnabled(fEnable);
fireWatchExpressionChanged(expression);
}
}
} else if (fSelection instanceof IWatchExpression) {
IWatchExpression expression= ((IWatchExpression) fSelection);
expression.setEnabled(fEnable);
fireWatchExpressionChanged(expression);
}
}
/**
* Fires a {@link DebugEvent} for the given watch expression
* @param expression the expression that has changed
*/
private void fireWatchExpressionChanged(IWatchExpression expression) {
DebugPlugin.getDefault().fireDebugEventSet(new DebugEvent[] {new DebugEvent(expression, DebugEvent.CHANGE)});
}
/**
* @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection)
*/
@Override
public void selectionChanged(IAction action, ISelection selection) {
fSelection= selection;
if (fSelection instanceof IStructuredSelection) {
boolean enabled= false;
Iterator<?> iter = ((IStructuredSelection) selection).iterator();
while (iter.hasNext()) {
IWatchExpression expression = getWatchExpression(iter.next());
if (expression != null && expression.isEnabled() != fEnable) {
enabled= true;
break;
}
}
action.setEnabled(enabled);
} else if (fSelection instanceof IWatchExpression) {
action.setEnabled(((IWatchExpression) fSelection).isEnabled() != fEnable);
} else {
action.setEnabled(false);
}
}
private IWatchExpression getWatchExpression(Object element) {
if (element instanceof IWatchExpression) {
return (IWatchExpression)element;
} else if (element instanceof IAdaptable) {
return ((IAdaptable)element).getAdapter(IWatchExpression.class);
}
return null;
}
/* (non-Javadoc)
* @see org.eclipse.ui.IActionDelegate2#dispose()
*/
@Override
public void dispose() {
DebugPlugin.getDefault().removeDebugEventListener(this);
}
/* (non-Javadoc)
* @see org.eclipse.ui.IActionDelegate2#init(org.eclipse.jface.action.IAction)
*/
@Override
public void init(IAction action) {
fAction = action;
}
/* (non-Javadoc)
* @see org.eclipse.ui.IActionDelegate2#runWithEvent(org.eclipse.jface.action.IAction, org.eclipse.swt.widgets.Event)
*/
@Override
public void runWithEvent(IAction action, Event event) {
run(action);
}
/* (non-Javadoc)
* @see org.eclipse.debug.core.IDebugEventSetListener#handleDebugEvents(org.eclipse.debug.core.DebugEvent[])
*/
@Override
public void handleDebugEvents(DebugEvent[] events) {
for (int i = 0; i < events.length; i++) {
DebugEvent event = events[i];
if (event.getSource() instanceof IWatchExpression) {
if (event.getKind() == DebugEvent.CHANGE) {
selectionChanged(fAction, fSelection);
}
}
}
}
}
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