Examples with CubridDnDNodeHandler com.cubrid.common.ui.common.navigator.dnd.CubridDnDNodeHandler used on opensource projects

Example 1 with CubridDnDNodeHandler

use of com.cubrid.common.ui.common.navigator.dnd.CubridDnDNodeHandler in project cubrid-manager by CUBRID.

the class CubridNavigatorView method addTreeDropTarget.

/**
	 * Add drop target
	 *
	 * @param tree Tree
	 */
private void addTreeDropTarget(final Tree tree) {
    // DropTarget for tree
    Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
    int operations = DND.DROP_MOVE | DND.DROP_COPY;
    DropTarget target = new DropTarget(tree, operations);
    target.setTransfer(types);
    target.addDropListener(new DropTargetAdapter() {

        /**
			 * Drag item enter the tree items
			 */
        public void dragEnter(DropTargetEvent event) {
            TreeItem[] selectedItems = tree.getSelection();
            //do not support multi DROP_COPY
            if (event.detail == DND.DROP_COPY && selectedItems.length > 1) {
                event.detail = DND.DROP_NONE;
                event.feedback = DND.FEEDBACK_NONE;
            }
        }

        /**
			 * When drag operation change, check whether to support this operation
			 */
        public void dragOperationChanged(DropTargetEvent event) {
            dragEnter(event);
        }

        /**
			 * Drag item over the tree items.
			 */
        public void dragOver(DropTargetEvent event) {
            event.feedback = DND.FEEDBACK_EXPAND | DND.FEEDBACK_SCROLL;
            if (event.item == null) {
                event.feedback = DND.FEEDBACK_NONE;
                return;
            }
            //do not support multi DROP_COPY
            TreeItem[] selectedItems = tree.getSelection();
            if (event.detail == DND.DROP_COPY && selectedItems.length > 1) {
                event.feedback = DND.FEEDBACK_NONE;
                return;
            }
            //Target TreeItem
            TreeItem targetTreeItem = (TreeItem) event.item;
            ICubridNode data = (ICubridNode) targetTreeItem.getData();
            if (dataSupportDragOver(data)) {
                if (data instanceof CubridGroupNode) {
                    event.feedback |= DND.FEEDBACK_SELECT;
                    return;
                }
                //Convert drop coordinate from Display to Tree
                Point pt = Display.getCurrent().map(null, tree, event.x, event.y);
                Rectangle bounds = targetTreeItem.getBounds();
                if (pt.y < (bounds.y + bounds.height / 2)) {
                    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_NONE;
            }
        }

        public void drop(DropTargetEvent event) {
            if (event.data == null) {
                event.detail = DND.DROP_NONE;
                return;
            }
            TreeItem[] selectedItems = tree.getSelection();
            if (event.detail == DND.DROP_COPY && selectedItems.length > 1) {
                event.detail = DND.DROP_NONE;
                return;
            }
            final int dropOperation = event.detail;
            ICubridNode dropNode = null;
            boolean insertBefore = false;
            if (event.item == null) {
                List<CubridGroupNode> allGroup = getGroupNodeManager().getAllGroupNodes();
                dropNode = allGroup.get(allGroup.size() - 1);
            } else {
                //Move under a TreeItem node
                TreeItem dropItem = (TreeItem) event.item;
                dropNode = (ICubridNode) dropItem.getData();
                Point pt = Display.getCurrent().map(null, tree, event.x, event.y);
                Rectangle bounds = dropItem.getBounds();
                if (pt.y < bounds.y + bounds.height / 2) {
                    insertBefore = true;
                }
            }
            CubridDnDNodeHandler handler = getCubridDnDNodeHandler();
            boolean isSuccess = false;
            if (insertBefore) {
                for (TreeItem si : selectedItems) {
                    ICubridNode dragNode = (ICubridNode) si.getData();
                    isSuccess = handler.handle(dragNode, dropNode, insertBefore, dropOperation) || isSuccess;
                }
            } else {
                for (int i = selectedItems.length - 1; i >= 0; i--) {
                    TreeItem si = selectedItems[i];
                    ICubridNode dragNode = (ICubridNode) si.getData();
                    isSuccess = handler.handle(dragNode, dropNode, insertBefore, dropOperation) || isSuccess;
                }
            }
            if (isSuccess) {
                Object[] objs = tv.getExpandedElements();
                setTreeInput();
                tv.setExpandedElements(objs);
            }
        }
    });
}