/*******************************************************************************
* Copyright (c) 2004, 2015 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
* Ericsson - DSF-GDB version
* Nokia - Made generic to DSF
*******************************************************************************/
package org.eclipse.cdt.dsf.debug.internal.ui;
import org.eclipse.cdt.dsf.ui.viewmodel.datamodel.IDMVMContext;
import org.eclipse.debug.ui.DebugUITools;
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.swt.widgets.Display;
import org.eclipse.ui.IWindowListener;
import org.eclipse.ui.IWorkbench;
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", "Resume at Line",
* "Move to Line" and "Add Watch Expression" actions
* visible in editors only if there is a running debug session.
*/
public class EvaluationContextManager implements IWindowListener, IDebugContextListener {
// Avoid referencing the cdt.debug.ui plugin for this constnat so that the
// cdt.debug.ui is not automatically activated
// Bug 343867.
private static final String CDT_DEBUG_UI_PLUGIN_ID = "org.eclipse.cdt.debug.ui"; //$NON-NLS-1$
// Must use the same ID than the base CDT uses since we want to enable actions that are registered by base CDT.
private final static String DEBUGGER_ACTIVE = CDT_DEBUG_UI_PLUGIN_ID + ".debuggerActive"; //$NON-NLS-1$
protected static EvaluationContextManager fgManager;
protected EvaluationContextManager() {
}
public static void startup() {
Runnable r = new Runnable() {
@Override
public void run() {
if ( fgManager == null ) {
// FindBugs reported that it is unsafe to set s_resources
// before we finish to initialize the object, because of
// multi-threading. This is why we use a temporary variable.
EvaluationContextManager manager = new EvaluationContextManager();
IWorkbench workbench = PlatformUI.getWorkbench();
IWorkbenchWindow[] windows = workbench.getWorkbenchWindows();
for( int i = 0; i < windows.length; i++ ) {
manager.windowOpened( windows[i] );
}
workbench.addWindowListener( manager );
fgManager = manager;
}
}
};
Display display = Display.getCurrent();
if ( display == null )
display = Display.getDefault();
display.asyncExec( r );
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWindowListener#windowActivated(org.eclipse.ui.IWorkbenchWindow)
*/
@Override
public void windowActivated( IWorkbenchWindow window ) {
IDebugContextService service = DebugUITools.getDebugContextManager().getContextService(window);
service.addDebugContextListener(this);
selectionChanged( service.getActiveContext() );
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWindowListener#windowDeactivated(org.eclipse.ui.IWorkbenchWindow)
*/
@Override
public void windowDeactivated( IWorkbenchWindow window ) {
DebugUITools.getDebugContextManager().getContextService(window).removeDebugContextListener(this);
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWindowListener#windowClosed(org.eclipse.ui.IWorkbenchWindow)
*/
@Override
public void windowClosed( IWorkbenchWindow window ) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWindowListener#windowOpened(org.eclipse.ui.IWorkbenchWindow)
*/
@Override
public void windowOpened( IWorkbenchWindow window ) {
}
@Override
public void debugContextChanged(DebugContextEvent event) {
selectionChanged(event.getContext());
}
private void selectionChanged(ISelection selection ) {
if ( selection instanceof IStructuredSelection ) {
IStructuredSelection ss = (IStructuredSelection)selection;
if ( ss.size() == 1 ) {
Object element = ss.getFirstElement();
if ( element instanceof IDMVMContext ) {
setContext( (IDMVMContext)element );
return;
}
}
}
// no context in the given view
removeContext();
}
/**
* Sets the evaluation context.
*/
private void setContext( IDMVMContext target ) {
System.setProperty( DEBUGGER_ACTIVE, Boolean.TRUE.toString() );
}
/**
* Removes an evaluation context.
*/
private void removeContext() {
System.setProperty( DEBUGGER_ACTIVE, Boolean.FALSE.toString() );
}
}