@Override
public void performDragOver(DropTargetEvent event) {
if (!ArtifactTransfer.getInstance().isSupportedType(event.currentDataType)) {
event.detail = DND.DROP_NONE;
return;
}
final ArtifactData artData = ArtifactTransfer.getInstance().nativeToJava(event.currentDataType);
if (artData == null) {
event.detail = DND.DROP_NONE;
return;
}
for (Artifact art : artData.getArtifacts()) {
if (art.isOfType(CoreArtifactTypes.UniversalGroup)) {
event.detail = DND.DROP_NONE;
return;
}
}
Tree tree = treeViewer.getTree();
TreeItem dragOverTreeItem = tree.getItem(treeViewer.getTree().toControl(event.x, event.y));
event.feedback = DND.FEEDBACK_EXPAND;
event.detail = DND.DROP_NONE;
// Set as COPY if drag item over group (copy versus move will be determined on drop
if (dragOverTreeItem != null
&& ((GroupExplorerItem) dragOverTreeItem.getData()).isUniversalGroup()) {
event.detail = DND.DROP_COPY;
tree.setInsertMark(null, false);
}
// Handle re-ordering within same group
else if (dragOverTreeItem != null
&& !((GroupExplorerItem) dragOverTreeItem.getData()).isUniversalGroup()) {
GroupExplorerItem dragOverGroupItem = (GroupExplorerItem) dragOverTreeItem.getData();
IStructuredSelection selectedItem = (IStructuredSelection) treeViewer.getSelection();
Object obj = selectedItem.getFirstElement();
if (obj instanceof GroupExplorerItem) {
GroupExplorerItem droppingGroupItem = (GroupExplorerItem) obj;
// the group to move must belong to the same group as the member to insert before/after
if (dragOverGroupItem.getParentItem().equals(droppingGroupItem.getParentItem())) {
if (isFeedbackAfter) {
event.feedback = DND.FEEDBACK_INSERT_AFTER;
} else {
event.feedback = DND.FEEDBACK_INSERT_BEFORE;
}
event.detail = DND.DROP_MOVE;
}
} else {
if (isFeedbackAfter) {
event.feedback = DND.FEEDBACK_INSERT_AFTER;
} else {
event.feedback = DND.FEEDBACK_INSERT_BEFORE;
}
event.detail = DND.DROP_COPY;
}
} else {
tree.setInsertMark(null, false);
}
}
/**
* The <code>ArtifactTransfer</code> class is used to transfer an array of <code>Artifact</code>s from one part to
* another in a drag and drop operation or a cut, copy, paste action.
* <p>
* In every drag and drop operation there is a <code>DragSource</code> and a <code>DropTarget</code>. When a drag occurs
* a <code>Transfer</code> is used to marshall the drag data from the source into a byte array. If a drop occurs another
* <code>Transfer</code> is used to marshall the byte array into drop data for the target.
* </p>
* <p>
* When a <code>CutAction</code> or a <code>CopyAction</code> is performed, this transfer is used to place references to
* the selected resources on the <code>Clipboard</code>. When a <code>PasteAction</code> is performed, the references on
* the clipboard are used to move or copy the resources to the selected destination.
* </p>
* <p>
* This class can be used for a <code>Viewer<code> or an SWT component directly.
* A singleton is provided which may be serially reused (see <code>getInstance</code>). It is not intended to be
* subclassed.
* </p>
*
* @see org.eclipse.jface.viewers.StructuredViewer
* @see org.eclipse.swt.dnd.DropTarget
* @see org.eclipse.swt.dnd.DragSource
* @author Robert A. Fisher
*/
public class ArtifactTransfer extends ByteArrayTransfer {
/** Singleton instance. */
private static final ArtifactTransfer instance = new ArtifactTransfer();
// Create a unique ID to make sure that different Eclipse
// applications use different "types" of <code>ResourceTransfer</code>
private static final String TYPE_NAME =
"artifact-transfer-format:"
+ System.currentTimeMillis()
+ ":"
+ instance.hashCode(); // $NON-NLS-2$//$NON-NLS-1$
private static final int TYPEID = registerType(TYPE_NAME);
public static ArtifactTransfer getInstance() {
return instance;
}
@Override
protected int[] getTypeIds() {
return new int[] {TYPEID};
}
@Override
protected String[] getTypeNames() {
return new String[] {TYPE_NAME};
}
@Override
protected void javaToNative(Object data, TransferData transferData) {
if (!(data instanceof ArtifactData)) {
return;
}
ArtifactData artData = (ArtifactData) data;
/**
* The resource serialization format is: (int) number of artifacts Then, the following for each
* resource: (int) artID (int) tagID Then the following (int) urlLength (int) sourceLength
* (chars) url (chars) source
*/
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
DataOutputStream dataOut = new DataOutputStream(out);
// write the number of resources
dataOut.writeInt(artData.getArtifacts().length);
for (Artifact artifact : artData.getArtifacts()) {
writeArtifact(dataOut, artifact);
}
dataOut.writeInt(artData.getUrl().length());
dataOut.writeInt(artData.getSource().length());
dataOut.writeChars(artData.getUrl());
dataOut.writeChars(artData.getSource());
// cleanup
dataOut.close();
out.close();
byte[] bytes = out.toByteArray();
super.javaToNative(bytes, transferData);
} catch (Exception e) {
// it's best to send nothing if there were problems
}
}
@Override
public ArtifactData nativeToJava(TransferData transferData) {
/**
* The resource serialization format is: (int) number of artifacts Then, the following for each
* resource: (int) artID (int) tagID
*/
byte[] bytes = (byte[]) super.nativeToJava(transferData);
if (bytes == null) {
return null;
}
DataInputStream in = new DataInputStream(new ByteArrayInputStream(bytes));
try {
int count = in.readInt();
Artifact[] artifacts = new Artifact[count];
for (int i = 0; i < count; i++) {
artifacts[i] = readArtifact(in);
}
int urlLength = in.readInt();
int sourceLength = in.readInt();
String url = "";
for (int x = 0; x < urlLength; x++) {
url += in.readChar();
}
String source = "";
for (int x = 0; x < sourceLength; x++) {
source += in.readChar();
}
return new ArtifactData(artifacts, url, source);
} catch (Exception ex) {
OseeLog.log(Activator.class, Level.SEVERE, ex);
return null;
}
}
/** Reads a resource from the given stream. */
private Artifact readArtifact(DataInputStream dataIn) throws OseeCoreException, IOException {
int artID = dataIn.readInt();
int branchId = dataIn.readInt();
return ArtifactQuery.getArtifactFromId(artID, BranchManager.getBranch(branchId));
}
/**
* Writes the given resource to the given stream.
*
* @throws OseeCoreException
*/
private void writeArtifact(DataOutputStream dataOut, Artifact artifact)
throws IOException, OseeCoreException {
dataOut.writeInt(artifact.getArtId());
dataOut.writeInt(artifact.getFullBranch().getId());
}
}
