Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

/* CVS MESSAGES:

*

* $Id: JDnDTable.java 13655 2007-09-12 16:28:55Z bsanchez $

* $Log$

* Revision 1.3  2007-09-12 16:28:23  bsanchez

* *** empty log message ***

*

* Revision 1.2  2007/08/21 09:56:44  bsanchez

* - Variable no usada

*

* Revision 1.1  2007/08/20 08:34:46  evercher

* He fusionado LibUI con LibUIComponents

*

* Revision 1.1  2006/09/21 16:35:12  jaume

* *** empty log message ***

*

*

*/

package org.gvsig.gui.beans.controls.dnd;

import java.awt.Component;

import java.awt.Point;

import java.awt.datatransfer.DataFlavor;

import java.awt.datatransfer.StringSelection;

import java.awt.datatransfer.Transferable;

import java.awt.datatransfer.UnsupportedFlavorException;

import java.awt.dnd.DnDConstants;

import java.awt.dnd.DragGestureEvent;

import java.awt.dnd.DragGestureListener;

import java.awt.dnd.DragSource;

import java.awt.dnd.DragSourceDragEvent;

import java.awt.dnd.DragSourceDropEvent;

import java.awt.dnd.DragSourceEvent;

import java.awt.dnd.DragSourceListener;

import java.awt.dnd.DropTarget;

import java.awt.dnd.DropTargetDragEvent;

import java.awt.dnd.DropTargetDropEvent;

import java.awt.dnd.DropTargetEvent;

import java.awt.dnd.DropTargetListener;

import java.awt.geom.Point2D;

import java.io.IOException;

import java.util.ArrayList;

import java.util.StringTokenizer;

import javax.swing.JTable;

import javax.swing.table.TableCellRenderer;

/**

 * Preten ser una taula que accepte arrossegar i soltar. Ja mou coses i aix?

 * per? encara est? en proves.

 *

 * La intenci? ?s que pugues moure columnes, per? una volta posats, que moga

 * l?nies i cel?les lliurement.

 * @author jaume dominguez faus - jaume.dominguez@iver.es

 *

 */

public class JDnDTable extends JTable implements DragSourceListener,

                                                                DragGestureListener, DropTargetListener{

  private static final long serialVersionUID = -5479369256188567414L;

        private CellCoordinates        overCellCoordinates = null;

        private DragSource        dragSource;

        private CellCoordinates[]        selectedCells;

        private boolean        dragging;

        private CellCoordinates currSelectedCell;

        static final short FREE_CELL_MOVING = -4;

        public static final short ONLY_ALLOW_MOVING_ROWS = -2;

        public static final short ONLY_ALLOW_MOVING_COLUMNS = -1;

        public JDnDTable() {

                // Configure ourselves to be a drag source

                dragSource = new DragSource();

                dragSource.createDefaultDragGestureRecognizer(this, DnDConstants.ACTION_MOVE, this);

                // Configure ourselves to be a drop target

                new DropTarget(this, this);

        }

        public JDnDTable( JDnDTableModel model ) {

        super( model );

        // Configure ourselves to be a drag source

        dragSource = new DragSource();

        dragSource.createDefaultDragGestureRecognizer( this, DnDConstants.ACTION_MOVE, this);

        // Configure ourselves to be a drop target

        new DropTarget( this, this );

    }

        public void dragEnter(DragSourceDragEvent dsde) {

                Point thisLocation = this.getLocationOnScreen();

                Point clickLocation = dsde.getLocation();

                Point2D relativeLocation = new Point2D.Double(

                                (clickLocation.getX() - thisLocation.getX()),

                                (clickLocation.getY() - thisLocation.getY()));

                this.overCellCoordinates = locationToCellCoord(relativeLocation);

        }

        public void setSelectionMode(short mode) {

                if (mode == ONLY_ALLOW_MOVING_COLUMNS) {

                        setColumnSelectionAllowed(true);

                        setRowSelectionAllowed(false);

                } else if ( mode == ONLY_ALLOW_MOVING_ROWS) {

                        setColumnSelectionAllowed(false);

                        setRowSelectionAllowed(true);

                }

                ((JDnDTableModel) this.getModel()).setSelectionMode(mode);

        }

        private CellCoordinates locationToCellCoord(Point2D location) {

                int[] ij = new int[2];

                int width = (int) location.getX();

                int height = (int) location.getY();

                for (int i = 0; i < this.getColumnCount(); i++) {

                        int iColumnWidth = this.getColumnModel().getColumn(i).getWidth();

                        // it seems to be right, but just in case consideer to use:

                        // ? int iColumnWidth = this.getColumnModel().getColumn(i).getPreferredWidth();

                        if ((width - iColumnWidth) <= 0) {

                                ij[1] = i;

                                break;

                        }

                        width = width - iColumnWidth;

                }

                // Get the current default height for all rows

        int jRowHeight = this.getRowHeight();

                for (int j = 0; j < this.getRowCount(); j++) {

                // Determine highest cell in the row

                for (int c=0; c<this.getColumnCount(); c++) {

                    TableCellRenderer renderer = this.getCellRenderer(j, c);

                    Component comp = this.prepareRenderer(renderer, j, c);

                    int h = comp.getPreferredSize().height - 2*rowMargin;

                    jRowHeight = Math.max(jRowHeight, h);

                }

                if ((height - jRowHeight) <= 0) {

                        ij[0] = j;

                        break;

                }

                height = height - jRowHeight;

                }

                return new CellCoordinates(ij[0], ij[1]);

        }

        public void dragOver(DragSourceDragEvent dsde) {

                // TODO Auto-generated method stub

        }

        public void dropActionChanged(DragSourceDragEvent dsde) {

                // TODO Auto-generated method stub

        }

        public void dragDropEnd(DragSourceDropEvent dsde) {

                System.out.println("dragDropEnd");

                this.dragging = false;

        }

        public void dragExit(DragSourceEvent dse) {

                this.overCellCoordinates = null;

        }

        public void dragGestureRecognized(DragGestureEvent dge) {

                // TODO Auto-generated method stub

                this.selectedCells = this.getSelectedCells();

                Object[] selectedObjects = this.getSelectedValues();

                if (selectedObjects.length>0) {

                        StringBuffer sb = new StringBuffer();

            for( int i=0; i<selectedObjects.length; i++ ) {

                sb.append( selectedObjects[ i ].toString() + "\n" );

            }

            // Build a StringSelection object that the Drag Source

            // can use to transport a string to the Drop Target

            StringSelection text = new StringSelection( sb.toString() );

            // Start dragging the object

            this.dragging = true;

            dragSource.startDrag( dge, DragSource.DefaultMoveDrop, text, this );

            System.err.println("Selected objects\n"+sb.toString());

                }

        }

        private Object[] getSelectedValues() {

                ArrayList values = new ArrayList(selectedCells.length);

                for (int i = 0; i < selectedCells.length; i++) {

                        values.add(this.getValueAt(selectedCells[i].i, selectedCells[i].j));

                }

                return values.toArray();

        }

        private CellCoordinates[] getSelectedCells() {

                ArrayList cells = new ArrayList();

                for (int i = 0; i < this.getColumnCount(); i++) {

                        for (int j = 0; j < this.getRowCount(); j++) {

                                if (this.isCellSelected(i, j))

                                        cells.add( new CellCoordinates(i,j) );

                        }

                }

                return (CellCoordinates[]) cells.toArray(new CellCoordinates[0]);

        }

        public void dragEnter(DropTargetDragEvent dtde) {

                // TODO

                System.out.println("dragEnter");

        }

        public void dragOver(DropTargetDragEvent dtde) {

                 // See who we are over...

                CellCoordinates overCellCoordinates = this.locationToCellCoord( dtde.getLocation());

        if( overCellCoordinates != null && !overCellCoordinates.equals(this.overCellCoordinates) ) {

            // If the value has changed from what we were previously over

            // then change the selected object to the one we are over; this

            // is a visual representation that this is where the drop will occur

            this.overCellCoordinates = overCellCoordinates;

            currSelectedCell = this.overCellCoordinates;

            System.out.println("Current cell  ["+currSelectedCell.i+","+currSelectedCell.j+"]");

        }

        }

        public void dropActionChanged(DropTargetDragEvent dtde) {

                // TODO Auto-generated method stub

        }

        public void drop(DropTargetDropEvent dtde) {

                try {

                        Transferable transferable = dtde.getTransferable();

                        if( transferable.isDataFlavorSupported( DataFlavor.stringFlavor ) ) {

                                dtde.acceptDrop( DnDConstants.ACTION_MOVE );

                                // Find out where the item was dropped

                                CellCoordinates newCellCoord = locationToCellCoord(dtde.getLocation());

                                // Get the items out of the transferable object and build an

                                // array out of them...

                                String s = ( String ) transferable.getTransferData( DataFlavor.stringFlavor );

                                StringTokenizer st = new StringTokenizer( s );

                                ArrayList items = new ArrayList();

                                while( st.hasMoreTokens() ) {

                                        items.add( st.nextToken() );

                                }

                                JDnDTableModel model = (JDnDTableModel) this.getModel();

                // If we are dragging from our this to our list them move the items,

                // otherwise just add them...

                if( this.dragging ) {

                    //model.itemsMoved( newIndex, items );

                    model.itemsMoved( newCellCoord, this.selectedCells );

                } else {

                    model.insertItems( newCellCoord, items );

                }

                // Update the selected cells

                /* TODO

                int[] newIndicies = new int[ items.size() ];

                for( int i=0; i<items.size(); i++ ) {

                    newIndicies[ i ] = newIndex + i;

                }

                this.setSelectedIndices( newIndicies );

                */

                // Reset the over index

                this.overCellCoordinates = null;

                dtde.getDropTargetContext().dropComplete( true );

                        } else {

                                dtde.rejectDrop();

                        }

                } catch( IOException exception ) {

                        exception.printStackTrace();

                        System.err.println( "Exception" + exception.getMessage());

                        dtde.rejectDrop();

                } catch( UnsupportedFlavorException ufException ) {

                        ufException.printStackTrace();

                        System.err.println( "Exception" + ufException.getMessage());

                        dtde.rejectDrop();

                }

        }

        public void dragExit(DropTargetEvent dte) {

                // TODO Auto-generated method stub

                System.out.println("dragExit");

        }

}

class CellCoordinates {

        int i, j;

        public CellCoordinates(int i, int j) {

                this.i = i;

                this.j = j;

        }

        public boolean equals(Object obj) {

                if (!(obj instanceof CellCoordinates))

                        return false;

                CellCoordinates other = (CellCoordinates) obj;

                return (this.i == other.i) && (this.j == other.j);

        }

}