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/*******************************************************************************
* Copyright (c) 2004, 2009 Tasktop Technologies 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:
* Tasktop Technologies - initial API and implementation
* Jevgeni Holodkov - improvements
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui.util;
import java.io.File;
import java.io.IOException;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.mylyn.commons.core.StatusHandler;
import org.eclipse.mylyn.internal.tasks.core.ITasksCoreConstants;
import org.eclipse.mylyn.internal.tasks.ui.TasksUiPlugin;
import org.eclipse.mylyn.internal.tasks.ui.actions.CopyTaskDetailsAction;
import org.eclipse.swt.dnd.DragSourceAdapter;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.TextTransfer;
/**
* @author Mik Kersten
* @author Leo Dos Santos
* @author Steffen Pingel
*/
public class TaskDragSourceListener extends DragSourceAdapter {
private IStructuredSelection currentSelection;
private final ISelectionProvider selectionProvider;
public TaskDragSourceListener(ISelectionProvider selectionProvider) {
this.selectionProvider = selectionProvider;
}
@Override
public void dragStart(DragSourceEvent event) {
ISelection selection = selectionProvider.getSelection();
if (selection instanceof IStructuredSelection && !selection.isEmpty()) {
this.currentSelection = (IStructuredSelection) selection;
} else {
this.currentSelection = null;
event.doit = false;
}
}
@Override
public void dragSetData(DragSourceEvent event) {
if (currentSelection == null || currentSelection.isEmpty()) {
return;
}
if (LocalSelectionTransfer.getTransfer().isSupportedType(event.dataType)) {
LocalSelectionTransfer.getTransfer().setSelection(currentSelection);
} else if (FileTransfer.getInstance().isSupportedType(event.dataType)) {
try {
File file = File.createTempFile(ITasksCoreConstants.EXPORT_FILE_NAME,
ITasksCoreConstants.FILE_EXTENSION);
file.deleteOnExit();
ImportExportUtil.export(file, currentSelection);
String[] paths = new String[1];
paths[0] = file.getAbsolutePath();
event.data = paths;
} catch (CoreException e) {
StatusHandler.log(new Status(IStatus.ERROR, TasksUiPlugin.ID_PLUGIN,
"Problems encountered dragging task", //$NON-NLS-1$
e));
} catch (IOException e) {
StatusHandler.log(new Status(IStatus.ERROR, TasksUiPlugin.ID_PLUGIN,
"Problems encountered dragging task", //$NON-NLS-1$
e));
}
} else if (TextTransfer.getInstance().isSupportedType(event.dataType)) {
event.data = CopyTaskDetailsAction.getTextForTask(currentSelection.getFirstElement());
}
}
@Override
public void dragFinished(DragSourceEvent event) {
if (LocalSelectionTransfer.getTransfer().isSupportedType(event.dataType)) {
LocalSelectionTransfer.getTransfer().setSelection(null);
}
}
}
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