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/*******************************************************************************
* Copyright (c) 2010 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.e4.core.internal.contexts.debug.ui;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import javax.annotation.PreDestroy;
import javax.inject.Inject;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.core.di.extensions.EventUtils;
import org.eclipse.e4.core.internal.contexts.EclipseContext;
import org.eclipse.e4.ui.model.application.ui.MContext;
import org.eclipse.e4.ui.model.application.ui.basic.MWindow;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.osgi.service.event.EventAdmin;
public class FindTargetAction {
// TBD this is from internal AbstractPartRenderer.OWNING_ME
// make that API
private static final String OWNING_ME = "modelElement"; //$NON-NLS-1$
@Inject
public EventAdmin eventAdmin;
private Cursor targetCursor;
private Cursor displayCursor;
@Inject
public FindTargetAction(Display display) {
targetCursor = new Cursor(display, SWT.CURSOR_CROSS);
}
@PreDestroy
public void dispose() {
if (targetCursor != null) {
targetCursor.dispose();
targetCursor = null;
}
}
@Execute
public void doFindTarget(MWindow win) {
final Control windowWidget = (Control) win.getWidget();
final Display display = windowWidget.getDisplay();
displayCursor = windowWidget.getCursor();
windowWidget.setCursor(targetCursor);
windowWidget.setCapture(true);
// This filter list is necessary to avoid not-initialized-errors within the
// actual listener. The filter approach is required as some platforms (e.g.,
// MacOS X) don't support setCapture().
// FIXME: should possible set this up for MouseUp, not MouseDown?
final LinkedList<Listener> filters = new LinkedList<Listener>();
filters.add(new Listener() {
public void handleEvent(Event event) {
Control control = display.getCursorControl();
IEclipseContext targetContext = null;
while (control != null) {
Object data = control.getData(OWNING_ME);
if (data instanceof MContext) {
targetContext = ((MContext) data).getContext();
if (targetContext != null)
break;
}
control = control.getParent();
}
if (targetContext != null) {
List<WeakContextRef> contexts = new ArrayList<WeakContextRef>();
while (targetContext != null) {
contexts.add(new WeakContextRef((EclipseContext) targetContext));
targetContext = targetContext.getParent();
}
Collections.reverse(contexts);
TreePath path = new TreePath(contexts.toArray());
EventUtils.send(eventAdmin, ContextsView.SELECT_EVENT, path);
}
windowWidget.setCapture(false);
windowWidget.setCursor(displayCursor);
for (Listener f : filters) {
display.removeFilter(SWT.MouseDown, f);
}
filters.clear();
}
});
for (Listener f : filters) {
display.addFilter(SWT.MouseDown, f);
}
}
}
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