/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.openide.explorer.view;

import java.awt.dnd.*;

import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.tree.*;

import org.openide.nodes.Node;
import org.openide.explorer.ExplorerManager;

/** Support for the drag operations in the TreeView.
*
* @author Dafe Simonek, Jiri Rechtacek
*/
final class TreeViewDragSupport extends ExplorerDragSupport {

    // Attributes

    // Associations

    /** The view that manages viewing the data in a tree. */
    protected TreeView view;

    /** The tree which we are supporting (our client) */
    private JTree tree;

    /** Cell renderer - PENDING - do we need it? */
    //protected DnDTreeViewCellRenderer cellRenderer;

    // Operations
    /** Creates new TreeViewDragSupport, initializes gesture */
    public TreeViewDragSupport(TreeView view, JTree tree) {
        this.view = view;
        this.comp = tree;
        this.tree = tree;
    }

    public void dragGestureRecognized (DragGestureEvent dge) {
        super.dragGestureRecognized (dge);
        // notify tree cell editor that DnD operationm is active
        if (exDnD.isDnDActive ()) {
            TreeCellEditor tce = ((JTree)tree).getCellEditor ();
            if (tce instanceof TreeViewCellEditor)
                ((TreeViewCellEditor)tce).setDnDActive (true);
        }
    }

    public void dragDropEnd (DragSourceDropEvent dsde) {
        // get the droped nodes
        Node[] dropedNodes = exDnD.getDraggedNodes ();
        super.dragDropEnd (dsde);

        // if any original glass pane was stored (the DnD was broken e.g. by Esc)
        if (DropGlassPane.isOriginalPaneStored ()) {
            // give back the orig glass pane
            DropGlassPane.putBackOriginal ();
            // DnD is not active
            exDnD.setDnDActive (false);
        }
        
        // select the droped nodes
        try {
            if (dropedNodes!=null) {
                ExplorerManager.Provider panel = (ExplorerManager.Provider)SwingUtilities
                    .getAncestorOfClass(ExplorerManager.Provider.class, view);
                if (panel!=null) {
                    panel.getExplorerManager ().setSelectedNodes (dropedNodes);
                }
            }
        } catch (Exception e) {
            // don't care
        }
        
        // notify tree cell editor that DnD operationm is active
        // no more
        TreeCellEditor tce = tree.getCellEditor();
        if (tce instanceof TreeViewCellEditor)
            ((TreeViewCellEditor)tce).setDnDActive (false);
    }

    /** Utility method. Returns either selected nodes in tree
    * (if cursor hotspot is above some selected node) or the node
    * the cursor points to.
    * @return Node array or null if position of the cursor points
    * to no node.
    */
    Node[] obtainNodes (DragGestureEvent dge) {
        TreePath[] tps = tree.getSelectionPaths ();
        if (tps == null) return null;
        Node[] result = new Node[tps.length];
        
        
        int cnt = 0;
        for (int i = 0; i < tps.length; i++) {
            if (tree.getPathBounds (tps[i]).contains (
                dge.getDragOrigin ()
            )) {
                cnt++;
            }
            
            result[i] = DragDropUtilities.secureFindNode (tps[i].getLastPathComponent ());
        }
        // #41954:
        // if the drag source is not at all in path location, do not return
        // any nodes
        return cnt == 0 ? null : result;
    }

} /* end class TreeViewDragSupport */