/*******************************************************************************
* Copyright (c) 2007 IBM Corporation 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:
* IBM Corporation - initial API and implementation
******************************************************************************/
package org.eclipse.ui.internal.menus;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Widget;
import org.eclipse.ui.AbstractSourceProvider;
import org.eclipse.ui.ISources;
import org.eclipse.ui.swt.IFocusService;
/**
* @since 3.3
*
*/
public class FocusControlSourceProvider extends AbstractSourceProvider
implements IFocusService {
/**
* The names of the sources supported by this source provider.
*/
private static final String[] PROVIDED_SOURCE_NAMES = new String[] {
ISources.ACTIVE_FOCUS_CONTROL_ID_NAME,
ISources.ACTIVE_FOCUS_CONTROL_NAME };
Map controlToId = new HashMap();
private FocusListener focusListener;
private String currentId;
private Control currentControl;
private DisposeListener disposeListener;
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.menus.IFocusService#addTrackerFor(org.eclipse.swt.widgets.Control,
* java.lang.String)
*/
public void addFocusTracker(Control control, String id) {
if (control.isDisposed()) {
return;
}
controlToId.put(control, id);
control.addFocusListener(getFocusListener());
control.addDisposeListener(getDisposeListener());
}
/**
* @return
*/
private DisposeListener getDisposeListener() {
if (disposeListener == null) {
disposeListener = new DisposeListener() {
public void widgetDisposed(DisposeEvent e) {
controlToId.remove(e.widget);
}
};
}
return disposeListener;
}
/**
* @return
*/
private FocusListener getFocusListener() {
if (focusListener == null) {
focusListener = new FocusListener() {
public void focusGained(FocusEvent e) {
focusIn(e.widget);
}
public void focusLost(FocusEvent e) {
focusIn(null);
}
};
}
return focusListener;
}
/**
* @param widget
*/
private void focusIn(Widget widget) {
String id = (String) controlToId.get(widget);
if (currentId != id) {
if (id == null) {
currentId = null;
currentControl = null;
} else {
currentId = id;
currentControl = (Control) widget;
}
Map m = new HashMap();
m.put(ISources.ACTIVE_FOCUS_CONTROL_ID_NAME, currentId);
m.put(ISources.ACTIVE_FOCUS_CONTROL_NAME, currentControl);
fireSourceChanged(ISources.ACTIVE_MENU, m);
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.menus.IFocusService#removeTrackerFor(org.eclipse.swt.widgets.Control)
*/
public void removeFocusTracker(Control control) {
controlToId.remove(control);
if (control.isDisposed()) {
return;
}
control.removeFocusListener(getFocusListener());
control.removeDisposeListener(getDisposeListener());
}
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.ISourceProvider#dispose()
*/
public void dispose() {
Iterator i = controlToId.keySet().iterator();
while (i.hasNext()) {
Control c = (Control) i.next();
if (!c.isDisposed()) {
c.removeFocusListener(getFocusListener());
c.removeDisposeListener(getDisposeListener());
}
}
controlToId.clear();
controlToId = null;
focusListener = null;
disposeListener = null;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.ISourceProvider#getCurrentState()
*/
public Map getCurrentState() {
Map m = new HashMap();
m.put(ISources.ACTIVE_FOCUS_CONTROL_ID_NAME, currentId);
m.put(ISources.ACTIVE_FOCUS_CONTROL_NAME, currentControl);
return m;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.ISourceProvider#getProvidedSourceNames()
*/
public String[] getProvidedSourceNames() {
return PROVIDED_SOURCE_NAMES;
}
}