ImageExportWizard.java

/*
 * This file is part of ImageExport.
 *
 * ImageExport is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ImageExport is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ImageExport.  If not, see <http://www.gnu.org/licenses/>.
 */
package nl.utwente.ce.imageexport.core;

import java.io.File;

import nl.utwente.ce.imageexport.ExceptionErrorDialog;
import nl.utwente.ce.imageexport.Utils;
import nl.utwente.ce.imageexport.page.ExportImagePage;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.draw2d.IFigure;
import org.eclipse.gef.GraphicalViewer;
import org.eclipse.gef.LayerConstants;
import org.eclipse.gef.editparts.LayerManager;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IExportWizard;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IWorkbench;

public class ImageExportWizard extends Wizard implements IExportWizard
{
    private static ExportImagePage mainPage;
    private IWorkbench workbench;

    public ImageExportWizard()
    {
    }

    @Override
    public void init(IWorkbench workbench, IStructuredSelection currentSelection)
    {
        this.workbench = workbench;
        setWindowTitle("Export image");
    }

    @Override
    public void addPages()
    {
        super.addPages();
        if (mainPage == null)
        {
            // Keep between multiple exports (ie to keep the settings)
            mainPage = new ExportImagePage(getGraphicalViewer() != null);
        }

        // Update default path
        final IEditorPart activeEditor = getActiveEditor();
        if (activeEditor != null)
        {
            IEditorInput input = activeEditor.getEditorInput();
            if (input instanceof IFileEditorInput)
            {
                String filePath = ((IFileEditorInput) input).getFile().getRawLocation().toString();
                mainPage.setDefaultPath(filePath);
            }
        }
        addPage(mainPage);
    }

    @Override
    public boolean performFinish()
    {
        try
        {
            GraphicalViewer graphicalViewer = getGraphicalViewer();
            if (graphicalViewer == null)
            {
                // Could not find a suitable (GEF based) viewer...
                return false;
            }
            LayerManager layerManager = (LayerManager) graphicalViewer.getEditPartRegistry().get(LayerManager.ID);
            IFigure rootFigure = layerManager.getLayer(LayerConstants.PRINTABLE_LAYERS);

            String filename = Utils.sanitizePath(new File(mainPage.getFilename()));
            ImageFormatProvider imageProvider = mainPage.getImageProvider();

            imageProvider.getProvider().exportImage(imageProvider.getID(), filename, rootFigure);

            // Export went ok, so store preferences
            mainPage.storePreferences();
        } catch (Throwable t)
        {
            IStatus status = new Status(IStatus.ERROR, ImageExportPlugin.PLUGIN_ID,
                    "An error occurred during exporting the image", t);
            ExceptionErrorDialog.openError(getShell(), "Image export error", null, status);
            return false;
        }
        return true;
    }

    /** @return the active graphical viewer, or null is there is not one present */
    private GraphicalViewer getGraphicalViewer()
    {
        IEditorPart editor = getActiveEditor();
        if (editor == null)
        {
            // There is not active/open editor available...
            return null;
        }
        return (GraphicalViewer) editor.getAdapter(GraphicalViewer.class);
    }

    private IEditorPart getActiveEditor()
    {
        return workbench.getActiveWorkbenchWindow().getActivePage().getActiveEditor();
    }
}