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/*******************************************************************************
* Copyright (c) 2000, 2011 IBM 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:
* IBM Corporation - initial API and implementation
* Patrick Chuong (Texas Instruments) - Improve usability of the breakpoint view (Bug 238956)
*******************************************************************************/
package org.eclipse.debug.internal.ui.views.breakpoints;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.util.TransferDragSourceListener;
import org.eclipse.jface.viewers.AbstractTreeViewer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ITreeSelection;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSourceAdapter;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.widgets.Item;
/**
* A drag adapter for the breakpoints viewer
*/
public class BreakpointsDragAdapter extends DragSourceAdapter implements TransferDragSourceListener {
/**
* the associated viewer for the adapter
*/
private AbstractTreeViewer fViewer;
private Item[] fItems = null;
private BreakpointsView fView;
private TreePath[] fTreePaths = null;
/**
* Constructor
* @param viewer the associated viewer, which acts as the selection provider and therefore <b>must</b> implement <code>ISelectionProvider</code>
*/
public BreakpointsDragAdapter(BreakpointsViewer viewer) {
Assert.isNotNull(viewer);
fViewer = viewer;
}
public BreakpointsDragAdapter(AbstractTreeViewer viewer, BreakpointsView view) {
Assert.isNotNull(view);
fViewer = viewer;
fView = view;
}
/* (non-Javadoc)
* @see org.eclipse.jface.util.TransferDragSourceListener#getTransfer()
*/
@Override
public Transfer getTransfer() {
return LocalSelectionTransfer.getTransfer();
}
/* non Java-doc
* @see org.eclipse.swt.dnd.DragSourceListener#dragStart
*/
@Override
public void dragStart(DragSourceEvent event) {
ISelection selection = fViewer.getSelection();
LocalSelectionTransfer.getTransfer().setSelection(selection);
LocalSelectionTransfer.getTransfer().setSelectionSetTime(event.time & 0xFFFFFFFFL);
if (fViewer instanceof BreakpointsViewer) {
BreakpointsViewer viewer = (BreakpointsViewer)fViewer;
fItems = viewer.getSelectedItems();
event.doit = viewer.canDrag(fItems);
} else {
if (selection instanceof ITreeSelection) {
fTreePaths = ((ITreeSelection) selection).getPaths();
} else {
fTreePaths = new TreePath[0];
}
event.doit = fView.canDrag(fTreePaths);
}
}
/* non Java-doc
* @see org.eclipse.swt.dnd.DragSourceListener#dragSetData
*/
@Override
public void dragSetData(DragSourceEvent event) {
// For consistency set the data to the selection even though
// the selection is provided by the LocalSelectionTransfer
// to the drop target adapter.
event.data = LocalSelectionTransfer.getTransfer().getSelection();
}
/* non Java-doc
* @see org.eclipse.swt.dnd.DragSourceListener#dragFinished
*/
@Override
public void dragFinished(DragSourceEvent event) {
if (event.detail == DND.DROP_MOVE) {
// remove from source on move operation
if (fViewer instanceof BreakpointsViewer) {
BreakpointsViewer viewer = (BreakpointsViewer)fViewer;
viewer.performDrag(fItems);
} else {
fView.performDrag(fTreePaths);
}
}
fItems = null;
LocalSelectionTransfer.getTransfer().setSelection(null);
LocalSelectionTransfer.getTransfer().setSelectionSetTime(0);
}
}
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