Source Code : Drag and drop interaction (Smart GWT)

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Drag and drop interaction (Smart GWT)

   
/*
 * SmartGWT (GWT for SmartClient)
 * Copyright 2008 and beyond, Isomorphic Software, Inc.
 *
 * SmartGWT is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.  SmartGWT is also
 * available under typical commercial license terms - see
 * http://smartclient.com/license
 * This software 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
 * Lesser General Public License for more details.
 */

package com.smartgwt.sample.showcase.client;


import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;
import com.smartgwt.client.types.Alignment;
import com.smartgwt.client.types.DragAppearance;
import com.smartgwt.client.types.Overflow;
import com.smartgwt.client.types.Visibility;
import com.smartgwt.client.util.EventHandler;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.events.DropMoveEvent;
import com.smartgwt.client.widgets.events.DropMoveHandler;
import com.smartgwt.client.widgets.events.DropOutEvent;
import com.smartgwt.client.widgets.events.DropOutHandler;
import com.smartgwt.client.widgets.events.DropOverEvent;
import com.smartgwt.client.widgets.events.DropOverHandler;

public class Showcase implements EntryPoint{

    public void onModuleLoad() {
       RootPanel.get().add(getViewPanel());
    }


    public Canvas getViewPanel() {
        Canvas canvas = new Canvas();

        final Img img = new Img("pieces/48/pawn_green.png", 48, 48) {
            protected boolean setDragTracker() {
                Canvas c = new Canvas();
                String html = Canvas.imgHTML("pieces/24/pawn_green.png", 24, 24, null, null, null);
                EventHandler.setDragTracker(html);
                return false;
            }
        };
        img.setCanDrag(true);
        img.setCanDrop(true);
        img.setDragAppearance(DragAppearance.TRACKER);

        final DropLabel label = new DropLabel();
        label.setLeft(100);
        label.setWidth(300);
        label.setHeight(300);
        label.setBackgroundColor("lightblue");
        label.setAlign(Alignment.CENTER);
        label.setContents("Show Drop Reticle");
        label.setOverflow(Overflow.HIDDEN);
        label.setCanAcceptDrop(true);

        canvas.addChild(img);
        canvas.addChild(label);
        return canvas;
    }



    class DropLabel extends Label {

        private Canvas crossHairX;
        private Canvas crossHairY;

        protected void onInit() {
            crossHairX = createCrossHair();
            crossHairY = createCrossHair();
            addChild(crossHairX);
            addChild(crossHairY);

            this.addDropOverHandler(new DropOverHandler() {
                public void onDropOver(DropOverEvent event) {
                    getCrossHairX().show();
                    getCrossHairY().show();
                    updateCrossHairs();
                }
            });

            this.addDropMoveHandler(new DropMoveHandler() {
                public void onDropMove(DropMoveEvent event) {
                    updateCrossHairs();
                }
            });

            this.addDropOutHandler(new DropOutHandler() {
                public void onDropOut(DropOutEvent event) {
                    getCrossHairX().hide();
                    getCrossHairY().hide();
                }
            });

        }

        private Canvas createCrossHair() {
            Canvas canvas = new Canvas();
            canvas.setWidth(this.getWidth() + 2);
            canvas.setHeight(this.getHeight() + 2);
            canvas.setBorder("1px solid black");
            canvas.setVisibility(Visibility.HIDDEN);
            return canvas;
        }

        public Canvas getCrossHairX() {
            return crossHairX;
        }

        public Canvas getCrossHairY() {
            return crossHairY;
        }

        public void updateCrossHairs() {
            int x = getOffsetX();
            int y = getOffsetY();

            // crossHairX is the -X and +Y axis of the crossHair
            crossHairX.setLeft(x - getWidth() - 1);
            crossHairX.setTop(y - getHeight() - 1);

            // crossHairY is +X, -Y
            crossHairY.setLeft(x);
            crossHairY.setTop(y);
        }
    }

}

   
    
    
  

Thank with us