| /******************************************************************************* |
| * Copyright (c) 2000, 2008 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.jdt.internal.ui.viewsupport; |
| |
| 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.core.runtime.Assert; |
| import org.eclipse.core.runtime.ListenerList; |
| |
| import org.eclipse.jface.viewers.IPostSelectionProvider; |
| import org.eclipse.jface.viewers.ISelection; |
| import org.eclipse.jface.viewers.ISelectionChangedListener; |
| import org.eclipse.jface.viewers.ISelectionProvider; |
| import org.eclipse.jface.viewers.SelectionChangedEvent; |
| import org.eclipse.jface.viewers.StructuredSelection; |
| import org.eclipse.jface.viewers.StructuredViewer; |
| |
| /** |
| * A selection provider for view parts with more that one viewer. |
| * Tracks the focus of the viewers to provide the correct selection. |
| */ |
| public class SelectionProviderMediator implements IPostSelectionProvider { |
| |
| private class InternalListener implements ISelectionChangedListener, FocusListener { |
| /* |
| * @see ISelectionChangedListener#selectionChanged |
| */ |
| @Override |
| public void selectionChanged(SelectionChangedEvent event) { |
| doSelectionChanged(event); |
| } |
| |
| /* |
| * @see FocusListener#focusGained |
| */ |
| @Override |
| public void focusGained(FocusEvent e) { |
| doFocusChanged(e.widget); |
| } |
| |
| /* |
| * @see FocusListener#focusLost |
| */ |
| @Override |
| public void focusLost(FocusEvent e) { |
| // do not reset due to focus behavior on GTK |
| //fViewerInFocus= null; |
| } |
| } |
| |
| private class InternalPostSelectionListener implements ISelectionChangedListener { |
| @Override |
| public void selectionChanged(SelectionChangedEvent event) { |
| doPostSelectionChanged(event); |
| } |
| |
| } |
| |
| private StructuredViewer[] fViewers; |
| |
| private StructuredViewer fViewerInFocus; |
| private ListenerList<ISelectionChangedListener> fSelectionChangedListeners; |
| private ListenerList<ISelectionChangedListener> fPostSelectionChangedListeners; |
| |
| /** |
| * @param viewers All viewers that can provide a selection |
| * @param viewerInFocus the viewer currently in focus or <code>null</code> |
| */ |
| public SelectionProviderMediator(StructuredViewer[] viewers, StructuredViewer viewerInFocus) { |
| Assert.isNotNull(viewers); |
| fViewers= viewers; |
| InternalListener listener= new InternalListener(); |
| fSelectionChangedListeners= new ListenerList<>(); |
| fPostSelectionChangedListeners= new ListenerList<>(); |
| fViewerInFocus= viewerInFocus; |
| |
| for (int i= 0; i < fViewers.length; i++) { |
| StructuredViewer viewer= fViewers[i]; |
| viewer.addSelectionChangedListener(listener); |
| viewer.addPostSelectionChangedListener(new InternalPostSelectionListener()); |
| Control control= viewer.getControl(); |
| control.addFocusListener(listener); |
| } |
| } |
| |
| private void doFocusChanged(Widget control) { |
| for (int i= 0; i < fViewers.length; i++) { |
| if (fViewers[i].getControl() == control) { |
| propagateFocusChanged(fViewers[i]); |
| return; |
| } |
| } |
| } |
| |
| final void doPostSelectionChanged(SelectionChangedEvent event) { |
| ISelectionProvider provider= event.getSelectionProvider(); |
| if (provider == fViewerInFocus) { |
| firePostSelectionChanged(); |
| } |
| } |
| |
| final void doSelectionChanged(SelectionChangedEvent event) { |
| ISelectionProvider provider= event.getSelectionProvider(); |
| if (provider == fViewerInFocus) { |
| fireSelectionChanged(); |
| } |
| } |
| |
| final void propagateFocusChanged(StructuredViewer viewer) { |
| if (viewer != fViewerInFocus) { // OK to compare by identity |
| fViewerInFocus= viewer; |
| fireSelectionChanged(); |
| firePostSelectionChanged(); |
| } |
| } |
| |
| private void fireSelectionChanged() { |
| if (fSelectionChangedListeners != null) { |
| SelectionChangedEvent event= new SelectionChangedEvent(this, getSelection()); |
| |
| for (ISelectionChangedListener listener : fSelectionChangedListeners) { |
| listener.selectionChanged(event); |
| } |
| } |
| } |
| |
| private void firePostSelectionChanged() { |
| if (fPostSelectionChangedListeners != null) { |
| SelectionChangedEvent event= new SelectionChangedEvent(this, getSelection()); |
| |
| for (ISelectionChangedListener listener : fPostSelectionChangedListeners) { |
| listener.selectionChanged(event); |
| } |
| } |
| } |
| |
| /* |
| * @see ISelectionProvider#addSelectionChangedListener |
| */ |
| @Override |
| public void addSelectionChangedListener(ISelectionChangedListener listener) { |
| fSelectionChangedListeners.add(listener); |
| } |
| |
| /* |
| * @see ISelectionProvider#removeSelectionChangedListener |
| */ |
| @Override |
| public void removeSelectionChangedListener(ISelectionChangedListener listener) { |
| fSelectionChangedListeners.remove(listener); |
| } |
| |
| @Override |
| public void addPostSelectionChangedListener(ISelectionChangedListener listener) { |
| fPostSelectionChangedListeners.add(listener); |
| } |
| |
| |
| @Override |
| public void removePostSelectionChangedListener(ISelectionChangedListener listener) { |
| fPostSelectionChangedListeners.remove(listener); |
| } |
| |
| /* |
| * @see ISelectionProvider#getSelection |
| */ |
| @Override |
| public ISelection getSelection() { |
| if (fViewerInFocus != null) { |
| return fViewerInFocus.getSelection(); |
| } |
| return StructuredSelection.EMPTY; |
| } |
| |
| /* |
| * @see ISelectionProvider#setSelection |
| */ |
| @Override |
| public void setSelection(ISelection selection) { |
| if (fViewerInFocus != null) { |
| fViewerInFocus.setSelection(selection); |
| } |
| } |
| |
| public void setSelection(ISelection selection, boolean reveal) { |
| if (fViewerInFocus != null) { |
| fViewerInFocus.setSelection(selection, reveal); |
| } |
| } |
| |
| /** |
| * Returns the viewer in focus or null if no viewer has the focus |
| * @return returns the current viewer in focus |
| */ |
| public StructuredViewer getViewerInFocus() { |
| return fViewerInFocus; |
| } |
| } |