de.walware.ecommons.ui.util.PostSelectionProviderProxy.java Source code

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Here is the source code for de.walware.ecommons.ui.util.PostSelectionProviderProxy.java

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/*=============================================================================#
 # Copyright (c) 2012-2015 Stephan Wahlbrink (WalWare.de) 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:
 #     Stephan Wahlbrink - initial API and implementation
 #=============================================================================*/

package de.walware.ecommons.ui.util;

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;

public class PostSelectionProviderProxy extends AbstractPostSelectionProvider {

    private final ISelectionChangedListener fSelectionChangedListener = new ISelectionChangedListener() {
        @Override
        public void selectionChanged(final SelectionChangedEvent event) {
            fireSelectionChanged(
                    new SelectionChangedEvent(PostSelectionProviderProxy.this, getSelection(event.getSelection())));
        }
    };
    private final ISelectionChangedListener fPostSelectionChangedListener = new ISelectionChangedListener() {
        @Override
        public void selectionChanged(final SelectionChangedEvent event) {
            firePostSelectionChanged(
                    new SelectionChangedEvent(PostSelectionProviderProxy.this, getSelection(event.getSelection())));
        }
    };

    protected ISelectionProvider fSelectionProvider;

    public PostSelectionProviderProxy(final ISelectionProvider selectionProvider) {
        setSelectionProvider(selectionProvider);
    }

    public PostSelectionProviderProxy() {
    }

    protected void setSelectionProvider(final ISelectionProvider selectionProvider) {
        if (fSelectionProvider == selectionProvider) {
            return;
        }
        if (fSelectionProvider != null) {
            fSelectionProvider.removeSelectionChangedListener(fSelectionChangedListener);
            if (fSelectionProvider instanceof IPostSelectionProvider) {
                ((IPostSelectionProvider) fSelectionProvider)
                        .removePostSelectionChangedListener(fPostSelectionChangedListener);
            } else {
                fSelectionProvider.removeSelectionChangedListener(fPostSelectionChangedListener);
            }
        }
        fSelectionProvider = selectionProvider;
        if (fSelectionProvider != null) {
            fSelectionProvider.addSelectionChangedListener(fSelectionChangedListener);
            if (fSelectionProvider instanceof IPostSelectionProvider) {
                ((IPostSelectionProvider) fSelectionProvider)
                        .addPostSelectionChangedListener(fPostSelectionChangedListener);
            } else {
                fSelectionProvider.addSelectionChangedListener(fPostSelectionChangedListener);
            }
        }

        {
            final SelectionChangedEvent event = new SelectionChangedEvent(this, getSelection(getSelection()));

            fireSelectionChanged(event);
            firePostSelectionChanged(event);
        }
    }

    protected ISelectionProvider getSelectionProvider() {
        return fSelectionProvider;
    }

    @Override
    public void setSelection(final ISelection selection) {
        if (fSelectionProvider != null) {
            fSelectionProvider.setSelection(selection);
        }
    }

    @Override
    public ISelection getSelection() {
        return getSelection((fSelectionProvider != null) ? fSelectionProvider.getSelection() : null);
    }

    protected ISelection getSelection(final ISelection originalSelection) {
        return (originalSelection != null) ? originalSelection : StructuredSelection.EMPTY;
    }

}