/*******************************************************************************
* Copyright (c) 2004, 2005 QNX Software 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:
* QNX Software Systems - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.debug.internal.ui;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.cdt.debug.core.model.ICDebugTarget;
import org.eclipse.cdt.debug.ui.CDebugUIPlugin;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IPageListener;
import org.eclipse.ui.IPartListener2;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.IWindowListener;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchPartReference;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
/**
* Manages the current evaluation context (stack frame) for evaluation actions.
* In each page, the selection is tracked in each debug view (if any). When a debug
* target selection exists, the "debuggerActive" System property is set to true.
* This property is used to make the "Run To Line" and "Resume At Line" actions
* visible in editors only if there is a running debug session.
*/
public class EvaluationContextManager implements IWindowListener, IPageListener, ISelectionListener, IPartListener2 {
private final static String DEBUGGER_ACTIVE = CDebugUIPlugin.getUniqueIdentifier() + ".debuggerActive"; //$NON-NLS-1$
protected static EvaluationContextManager fgManager;
private Map<IWorkbenchPage, ICDebugTarget> fContextsByPage = null;
protected EvaluationContextManager() {
}
public static void startup() {
Runnable r = new Runnable() {
public void run() {
if (fgManager == null) {
fgManager = new EvaluationContextManager();
IWorkbench workbench = PlatformUI.getWorkbench();
IWorkbenchWindow[] windows = workbench.getWorkbenchWindows();
for (int i = 0; i < windows.length; i++) {
fgManager.windowOpened(windows[i]);
}
workbench.addWindowListener(fgManager);
}
}
};
CDebugUIPlugin.getStandardDisplay().asyncExec(r);
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWindowListener#windowActivated(org.eclipse.ui.IWorkbenchWindow)
*/
public void windowActivated(IWorkbenchWindow window) {
windowOpened(window);
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWindowListener#windowDeactivated(org.eclipse.ui.IWorkbenchWindow)
*/
public void windowDeactivated(IWorkbenchWindow window) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWindowListener#windowClosed(org.eclipse.ui.IWorkbenchWindow)
*/
public void windowClosed(IWorkbenchWindow window) {
window.removePageListener(this);
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWindowListener#windowOpened(org.eclipse.ui.IWorkbenchWindow)
*/
public void windowOpened(IWorkbenchWindow window) {
IWorkbenchPage[] pages = window.getPages();
for(int i = 0; i < pages.length; i++) {
window.addPageListener(this);
pageOpened(pages[i]);
}
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPageListener#pageActivated(org.eclipse.ui.IWorkbenchPage)
*/
public void pageActivated(IWorkbenchPage page) {
pageOpened(page);
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPageListener#pageClosed(org.eclipse.ui.IWorkbenchPage)
*/
public void pageClosed(IWorkbenchPage page) {
page.removeSelectionListener(IDebugUIConstants.ID_DEBUG_VIEW, this);
page.removePartListener(this);
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPageListener#pageOpened(org.eclipse.ui.IWorkbenchPage)
*/
public void pageOpened(IWorkbenchPage page) {
page.addSelectionListener(IDebugUIConstants.ID_DEBUG_VIEW, this);
page.addPartListener(this);
IWorkbenchPartReference ref = page.getActivePartReference();
if (ref != null) {
partActivated(ref);
}
}
/* (non-Javadoc)
* @see org.eclipse.ui.ISelectionListener#selectionChanged(org.eclipse.ui.IWorkbenchPart, org.eclipse.jface.viewers.ISelection)
*/
public void selectionChanged(IWorkbenchPart part, ISelection selection) {
IWorkbenchPage page = part.getSite().getPage();
if (selection instanceof IStructuredSelection) {
IStructuredSelection ss = (IStructuredSelection)selection;
if (ss.size() == 1) {
Object element = ss.getFirstElement();
if (element instanceof IAdaptable) {
ICDebugTarget target = (ICDebugTarget)((IAdaptable)element).getAdapter(ICDebugTarget.class);
if (target != null) {
setContext(page, target);
return;
}
}
}
}
// no context in the given view
removeContext(page);
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener2#partActivated(org.eclipse.ui.IWorkbenchPartReference)
*/
public void partActivated(IWorkbenchPartReference partRef) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener2#partBroughtToTop(org.eclipse.ui.IWorkbenchPartReference)
*/
public void partBroughtToTop(IWorkbenchPartReference partRef) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener2#partClosed(org.eclipse.ui.IWorkbenchPartReference)
*/
public void partClosed(IWorkbenchPartReference partRef) {
if (IDebugUIConstants.ID_DEBUG_VIEW.equals(partRef.getId())) {
removeContext(partRef.getPage());
}
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener2#partDeactivated(org.eclipse.ui.IWorkbenchPartReference)
*/
public void partDeactivated(IWorkbenchPartReference partRef) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener2#partOpened(org.eclipse.ui.IWorkbenchPartReference)
*/
public void partOpened(IWorkbenchPartReference partRef) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener2#partHidden(org.eclipse.ui.IWorkbenchPartReference)
*/
public void partHidden(IWorkbenchPartReference partRef) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener2#partVisible(org.eclipse.ui.IWorkbenchPartReference)
*/
public void partVisible(IWorkbenchPartReference partRef) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener2#partInputChanged(org.eclipse.ui.IWorkbenchPartReference)
*/
public void partInputChanged(IWorkbenchPartReference partRef) {
}
/**
* Sets the evaluation context for the given page, and notes that
* a valid execution context exists.
*
* @param page
* @param frame
*/
private void setContext(IWorkbenchPage page, ICDebugTarget target) {
if (fContextsByPage == null) {
fContextsByPage = new HashMap<IWorkbenchPage, ICDebugTarget>();
}
fContextsByPage.put(page, target);
System.setProperty(DEBUGGER_ACTIVE, Boolean.TRUE.toString());
}
/**
* Removes an evaluation context for the given page, and determines if
* any valid execution context remain.
*
* @param page
*/
private void removeContext(IWorkbenchPage page) {
if (fContextsByPage != null) {
fContextsByPage.remove(page);
if (fContextsByPage.isEmpty()) {
System.setProperty(DEBUGGER_ACTIVE, Boolean.FALSE.toString());
}
}
}
}