?? ?public void dndBuilder() {
?? ??? ?Transfer[] type = new Transfer[] { TextTransfer.getInstance() };
?? ??? ?int operations = DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK
?? ??? ??? ??? ?| DND.DROP_NONE;
?? ??? ?final DragSource source = new DragSource(tree, operations);
?? ??? ?source.setTransfer(type);
?? ??? ?final TreeItem[] dragSourceItem = new TreeItem[1];
?? ??? ?source.addDragListener(new DragSourceListener() {
?? ??? ??? ?public void dragStart(DragSourceEvent event) {
?? ??? ??? ??? ?TreeItem[] selection = tree.getSelection();
?? ??? ??? ??? ?if (selection.length > 0) {
?? ??? ??? ??? ??? ?event.doit = true;
?? ??? ??? ??? ??? ?dragSourceItem[0] = selection[0];
?? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ?event.doit = false;
?? ??? ??? ??? ?}
?? ??? ??? ?};
?? ??? ??? ?public void dragSetData(DragSourceEvent event) {
?? ??? ??? ??? ?event.data = dragSourceItem[0].getText();
?? ??? ??? ?}
?? ??? ??? ?public void dragFinished(DragSourceEvent event) {
?? ??? ??? ??? ?if (event.detail == DND.DROP_MOVE) {
?? ??? ??? ??? ??? ?dragSourceItem[0].dispose();
?? ??? ??? ??? ??? ?dragSourceItem[0] = null;
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ?});
?? ??? ?DropTarget target = new DropTarget(tree, operations);
?? ??? ?target.setTransfer(type);
?? ??? ?target.addDropListener(new DropTargetAdapter() {
?? ??? ??? ?private TreeItem initTreeItem(TreeItem sitem, TreeItem ditem) {
?? ??? ??? ??? ?ditem.setText(sitem.getText());
?? ??? ??? ??? ?ditem.setData(sitem.getData());
?? ??? ??? ??? ?for (int i = 0; i < sitem.getItemCount(); i++) {
?? ??? ??? ??? ??? ?TreeItem subitem = new TreeItem(ditem, SWT.NONE);
?? ??? ??? ??? ??? ?try {
?? ??? ??? ??? ??? ??? ?subitem = initTreeItem(sitem.getItem(i), subitem);
?? ??? ??? ??? ??? ?} catch (Exception e) {
?? ??? ??? ??? ??? ??? ?// e.printStackTrace();
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ??? ?return ditem;
?? ??? ??? ?}
?? ??? ??? ?private boolean checkValidate(TreeItem sitem, TreeItem ditem) {
?? ??? ??? ??? ?if (ditem.equals(sitem))
?? ??? ??? ??? ??? ?return false;
?? ??? ??? ??? ?TreeItem titem = ditem.getParentItem();
?? ??? ??? ??? ?while (titem != null) {
?? ??? ??? ??? ??? ?if (sitem.equals(titem))
?? ??? ??? ??? ??? ??? ?return false;
?? ??? ??? ??? ??? ?titem = titem.getParentItem();
?? ??? ??? ??? ?}
?? ??? ??? ??? ?return true;
?? ??? ??? ?}
?? ??? ??? ?public void dragOver(DropTargetEvent event) {
?? ??? ??? ??? ?event.feedback = DND.FEEDBACK_NONE | DND.FEEDBACK_SCROLL;
?? ??? ??? ??? ?if (event.item != null) {
?? ??? ??? ??? ??? ?TreeItem item = (TreeItem) event.item;
?? ??? ??? ??? ??? ?if (!checkValidate(dragSourceItem[0], item)) {
?? ??? ??? ??? ??? ??? ?event.detail = DND.DROP_NONE;
?? ??? ??? ??? ??? ??? ?return;
?? ??? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ??? ?event.detail = DND.DROP_MOVE;
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?Point pt = shell.getDisplay().map(null, tree, event.x,
?? ??? ??? ??? ??? ??? ??? ?event.y);
?? ??? ??? ??? ??? ?Rectangle bounds = item.getBounds();
?? ??? ??? ??? ??? ?if (pt.y < bounds.y + bounds.height / 3) {
?? ??? ??? ??? ??? ??? ?event.feedback |= DND.FEEDBACK_INSERT_BEFORE;
?? ??? ??? ??? ??? ?} else if (pt.y > bounds.y + 2 * bounds.height / 3) {
?? ??? ??? ??? ??? ??? ?event.feedback |= DND.FEEDBACK_INSERT_AFTER;
?? ??? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ??? ?event.feedback |= DND.FEEDBACK_SELECT;
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ??? ?public void drop(DropTargetEvent event) {
?? ??? ??? ??? ?if (event.data == null) {
?? ??? ??? ??? ??? ?event.detail = DND.DROP_NONE;
?? ??? ??? ??? ??? ?return;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?if (event.item == null) {
?? ??? ??? ??? ??? ?TreeItem item = new TreeItem(tree, SWT.NONE);
?? ??? ??? ??? ??? ?item = initTreeItem(dragSourceItem[0], item);
?? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ?TreeItem item = (TreeItem) event.item;
?? ??? ??? ??? ??? ?Point pt = shell.getDisplay().map(null, tree, event.x,
?? ??? ??? ??? ??? ??? ??? ?event.y);
?? ??? ??? ??? ??? ?Rectangle bounds = item.getBounds();
?? ??? ??? ??? ??? ?TreeItem parent = item.getParentItem();
?? ??? ??? ??? ??? ?if (parent != null) {
?? ??? ??? ??? ??? ??? ?TreeItem[] items = parent.getItems();
?? ??? ??? ??? ??? ??? ?int index = 0;
?? ??? ??? ??? ??? ??? ?for (int i = 0; i < items.length; i++) {
?? ??? ??? ??? ??? ??? ??? ?if (items[i] == item) {
?? ??? ??? ??? ??? ??? ??? ??? ?index = i;
?? ??? ??? ??? ??? ??? ??? ??? ?break;
?? ??? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ??? ?if (pt.y < bounds.y + bounds.height / 3) {
?? ??? ??? ??? ??? ??? ??? ?TreeItem newItem = new TreeItem(parent, SWT.NONE,
?? ??? ??? ??? ??? ??? ??? ??? ??? ?index);
?? ??? ??? ??? ??? ??? ??? ?newItem = initTreeItem(dragSourceItem[0], newItem);
?? ??? ??? ??? ??? ??? ?} else if (pt.y > bounds.y + 2 * bounds.height / 3) {
?? ??? ??? ??? ??? ??? ??? ?TreeItem newItem = new TreeItem(parent, SWT.NONE,
?? ??? ??? ??? ??? ??? ??? ??? ??? ?index + 1);
?? ??? ??? ??? ??? ??? ??? ?newItem = initTreeItem(dragSourceItem[0], newItem);
?? ??? ??? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ??? ??? ?TreeItem newItem = new TreeItem(item, SWT.NONE);
?? ??? ??? ??? ??? ??? ??? ?newItem = initTreeItem(dragSourceItem[0], newItem);
?? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ??? ?TreeItem[] items = tree.getItems();
?? ??? ??? ??? ??? ??? ?int index = 0;
?? ??? ??? ??? ??? ??? ?for (int i = 0; i < items.length; i++) {
?? ??? ??? ??? ??? ??? ??? ?if (items[i] == item) {
?? ??? ??? ??? ??? ??? ??? ??? ?index = i;
?? ??? ??? ??? ??? ??? ??? ??? ?break;
?? ??? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ??? ?if (pt.y < bounds.y + bounds.height / 3) {
?? ??? ??? ??? ??? ??? ??? ?TreeItem newItem = new TreeItem(tree, SWT.NONE,
?? ??? ??? ??? ??? ??? ??? ??? ??? ?index);
?? ??? ??? ??? ??? ??? ??? ?newItem = initTreeItem(dragSourceItem[0], newItem);
?? ??? ??? ??? ??? ??? ?} else if (pt.y > bounds.y + 2 * bounds.height / 3) {
?? ??? ??? ??? ??? ??? ??? ?TreeItem newItem = new TreeItem(tree, SWT.NONE,
?? ??? ??? ??? ??? ??? ??? ??? ??? ?index + 1);
?? ??? ??? ??? ??? ??? ??? ?newItem = initTreeItem(dragSourceItem[0], newItem);
?? ??? ??? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ??? ??? ?TreeItem newItem = new TreeItem(item, SWT.NONE);
?? ??? ??? ??? ??? ??? ??? ?newItem = initTreeItem(dragSourceItem[0], newItem);
?? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ??? ?tree.redraw();
?? ??? ??? ?}
?? ??? ?});
?? ?}