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/*******************************************************************************
* Copyright (c) 2012 Tilera 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:
* William R. Swanson (Tilera Corporation)
*******************************************************************************/
package org.eclipse.cdt.visualizer.ui.util;
import java.util.List;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchPart;
// ---------------------------------------------------------------------------
// WorkbenchSelectionAdapter
// ---------------------------------------------------------------------------
/**
* Selection change event manager
*/
public class WorkbenchSelectionAdapter implements ISelectionListener, ISelectionProvider {
// --- members ---
/** Workbench part (view) this adapter is associated with. */
protected IViewPart m_view = null;
/** Current selection */
protected ISelection m_selection = null;
/** Listeners for selection changed events. */
protected ListenerList m_selectionListeners = null;
/** Whether selection events are reported */
protected boolean m_trackSelection = true;
// --- constructors/destructors ---
/** Constructor. */
public WorkbenchSelectionAdapter(IViewPart view) {
m_view = view;
m_selection = null;
m_selectionListeners = new ListenerList(view,
"WorkbenchSelectionAdapter for view " + view.getClass().getSimpleName()) {
/** Dispatches event to listeners */
@Override
public void raise(Object listener, Object event) {
if (listener instanceof ISelectionChangedListener && event instanceof SelectionChangedEvent) {
ISelectionChangedListener typedListener = (ISelectionChangedListener) listener;
SelectionChangedEvent typedEvent = (SelectionChangedEvent) event;
typedListener.selectionChanged(typedEvent);
}
}
};
// listen for external selection changed events
m_view.getSite().getPage().addSelectionListener(this);
// set selection provider for this view
m_view.getSite().setSelectionProvider(this);
// initialize selection
setSelection(m_view.getSite().getPage().getSelection());
}
/** Dispose method. */
public void dispose() {
if (m_view != null) {
m_view.getSite().getPage().removeSelectionListener(this);
m_view.getViewSite().setSelectionProvider(null);
m_view = null;
}
m_selection = null;
if (m_selectionListeners != null) {
m_selectionListeners.clear();
m_selectionListeners = null;
}
}
// --- accessors ---
/** Gets whether selection change events are reported. */
public boolean getTrackSelection() {
return m_trackSelection;
}
/** Sets whether selection change events are reported. */
public void setTrackSelection(boolean trackSelection) {
m_trackSelection = trackSelection;
}
// --- ISelectionListener implementation ---
/** Invoked when selection changes externally. */
@Override
public void selectionChanged(IWorkbenchPart part, ISelection selection) {
// ignore selection change events that came from us
if (part == m_view)
return;
if (m_trackSelection) {
workbenchSelectionChanged(part, selection);
}
}
/** Invoked when selection changes.
* Intended to be overloaded by derived implementations.
*/
public void workbenchSelectionChanged(ISelection selection) {
setSelection(selection);
}
/** Invoked when selection changes.
* Intended to be overloaded by derived implementations.
*/
public void workbenchSelectionChanged(ISelectionProvider provider, ISelection selection) {
setSelection(provider, selection);
}
/** Invoked when selection changes.
* Intended to be overloaded by derived implementations.
*/
public void workbenchSelectionChanged(Object provider, ISelection selection) {
setSelection(provider, selection);
}
// --- ISelectionProvider implementation ---
/** Gets current selection. */
@Override
public ISelection getSelection() {
return m_selection;
}
/** Sets current selection, and raises selection changed event. */
@Override
public void setSelection(ISelection selection) {
// for some reason, SelectionChangedEvent can't stand a null selection
if (selection == null)
selection = StructuredSelection.EMPTY;
m_selection = selection;
m_selectionListeners.raise(new SelectionChangedEvent(this, m_selection));
}
/** Sets current selection, and raises selection changed event. */
public void setSelection(ISelectionProvider source, ISelection selection) {
// for some reason, SelectionChangedEvent can't stand a null selection
if (selection == null)
selection = StructuredSelection.EMPTY;
m_selection = selection;
m_selectionListeners.raise(new SelectionChangedEvent(source, m_selection));
}
/** Sets current selection, and raises selection changed event. */
public void setSelection(Object source, ISelection selection) {
// for some reason, SelectionChangedEvent can't stand a null selection
if (selection == null)
selection = StructuredSelection.EMPTY;
m_selection = selection;
m_selectionListeners.raise(new SelectionChangedEvent(new SelectionProviderAdapter(source), m_selection));
}
/** Adds external listener for selection change events. */
@Override
public void addSelectionChangedListener(ISelectionChangedListener listener) {
m_selectionListeners.addListener(listener);
}
/** Removes external listener for selection change events. */
@Override
public void removeSelectionChangedListener(ISelectionChangedListener listener) {
m_selectionListeners.removeListener(listener);
}
// --- utilities ---
/** Converts selection to string, for debug display. */
protected String selectionToString(ISelection selection) {
String result = null;
// convert selection to text string
if (m_selection == null) {
result = "No Selection";
} else if (m_selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection) m_selection;
List<?> elements = structuredSelection.toList();
int size = elements.size();
if (size == 0) {
result = "Empty Selection";
} else {
result = "";
for (int i = 0; i < size; i++) {
if (i > 0)
result += "\n";
Object o = elements.get(i);
String type = o.getClass().getName();
String value = o.toString();
result += "[" + i + "]: type= + " + type + ", value='" + value + "'";
}
}
} else {
String type = m_selection.getClass().getName();
String value = m_selection.toString();
result = "type=" + type + ", value='" + value + "'";
}
return result;
}
}
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