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/*******************************************************************************
* Copyright (c) 2006, 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
*******************************************************************************/
package org.eclipse.ui.internal.services;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.AbstractSourceProvider;
import org.eclipse.ui.ISources;
/**
* <p>
* A listener to changes in the showing menus. This is used to activate handlers
* just for the span of a menu being shown. This is needed for full support for
* legacy action-based extension points.
* </p>
* <p>
* This class is only intended for internal use within
* <code>org.eclipse.ui.workbench</code>.
* </p>
*
* @since 3.2
*/
public final class MenuSourceProvider extends AbstractSourceProvider {
/**
* The names of the sources supported by this source provider.
*/
private static final String[] PROVIDED_SOURCE_NAMES = new String[] { ISources.ACTIVE_MENU_NAME,
ISources.ACTIVE_MENU_SELECTION_NAME, ISources.ACTIVE_MENU_EDITOR_INPUT_NAME };
/**
* The menu ids that are currently showing, as known by this source provider.
* This value may be <code>null</code>.
*/
private Set menuIds = new HashSet();
/**
* Adds all of the given menu identifiers as being shown.
*
* @param menuIds The ids of the menu that is now showing; must not be
* <code>null</code>.
*/
public void addShowingMenus(final Set menuIds, final ISelection localSelection, final ISelection localEditorInput) {
this.menuIds.addAll(menuIds);
if (DEBUG) {
logDebuggingInfo("Menu ids changed to " + this.menuIds); //$NON-NLS-1$
}
Map m = new HashMap();
m.put(ISources.ACTIVE_MENU_NAME, this.menuIds);
if (selection != localSelection) {
selection = localSelection;
m.put(ISources.ACTIVE_MENU_SELECTION_NAME,
selection == null ? IEvaluationContext.UNDEFINED_VARIABLE : selection);
}
if (input != localEditorInput) {
input = localEditorInput;
m.put(ISources.ACTIVE_MENU_EDITOR_INPUT_NAME,
input == null ? IEvaluationContext.UNDEFINED_VARIABLE : input);
}
fireSourceChanged(ISources.ACTIVE_MENU, m);
}
@Override
public void dispose() {
menuIds.clear();
selection = null;
input = null;
}
@Override
public Map getCurrentState() {
final Map state = new HashMap();
state.put(ISources.ACTIVE_MENU_NAME, menuIds);
state.put(ISources.ACTIVE_MENU_SELECTION_NAME,
selection == null ? IEvaluationContext.UNDEFINED_VARIABLE : selection);
state.put(ISources.ACTIVE_MENU_EDITOR_INPUT_NAME,
input == null ? IEvaluationContext.UNDEFINED_VARIABLE : input);
return state;
}
@Override
public String[] getProvidedSourceNames() {
return PROVIDED_SOURCE_NAMES;
}
/**
* Removes all of the given menu identifiers as being shown.
*
* @param menuIds The ids of the menu that is no longer shown; must not be
* <code>null</code>.
*/
public void removeShowingMenus(final Set menuIds, final ISelection localSelection,
final ISelection localEditorInput) {
this.menuIds.removeAll(menuIds);
if (DEBUG) {
logDebuggingInfo("Menu ids changed to " + this.menuIds); //$NON-NLS-1$
}
Map m = new HashMap();
m.put(ISources.ACTIVE_MENU_NAME, this.menuIds);
if (selection != localSelection) {
selection = localSelection;
m.put(ISources.ACTIVE_MENU_SELECTION_NAME,
selection == null ? IEvaluationContext.UNDEFINED_VARIABLE : selection);
}
if (input != localEditorInput) {
input = localEditorInput;
m.put(ISources.ACTIVE_MENU_EDITOR_INPUT_NAME,
input == null ? IEvaluationContext.UNDEFINED_VARIABLE : input);
}
fireSourceChanged(ISources.ACTIVE_MENU, m);
}
private ISelection selection = null;
private ISelection input = null;
}
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