Source Code : Drag Tracker Sample (Smart GWT)

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Drag Tracker Sample (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.util.EventHandler;
import com.smartgwt.client.util.SC;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.events.DropEvent;
import com.smartgwt.client.widgets.events.DropHandler;
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() {

    DragPiece blue = new DragPiece("pawn_blue.png") {
    protected boolean setDragTracker() {
      EventHandler.setDragTracker("Blue Piece");
      return false;
    }
    };
      blue.setID("bluePiece");
    blue.setTitle("Blue Piece");
    blue.setLeft(50);
    blue.setTop(50);
          
    DragPiece green = new DragPiece("pawn_green.png"){
    protected boolean setDragTracker() {
              String html = Canvas.imgHTML("pieces/24/pawn_green.png", 24, 24);
      EventHandler.setDragTracker(html);
      return false;
    }
    };
      green.setID("greenPiece");
    green.setTitle("Green Piece");
    green.setLeft(150);
    green.setTop(50);
    

    final Label label = new Label("Drop Here");
    label.setLeft(250);
    label.setTop(50);
    label.setShowEdges(true);
    label.setAlign(Alignment.CENTER);
    label.setCanAcceptDrop(true);
    label.addDropOverHandler(new DropOverHandler() {
    public void onDropOver(DropOverEvent event) {
      label.setBackgroundColor("#ffff80");      
    }
    });
    
    label.addDropOutHandler(new DropOutHandler() {
    public void onDropOut(DropOutEvent event) {
      label.setBackgroundColor("#ffffff");
    }       
    });
    
      label.addDropHandler(new DropHandler() {
    public void onDrop(DropEvent event) {
              Canvas target = EventHandler.getDragTarget();
              SC.say("You dropped the " +  target.getID());       
    }         
      });
      
      Canvas canvas = new Canvas();
      canvas.addChild(blue);
      canvas.addChild(green);
      canvas.addChild(label);
      return canvas;
  }

  
  private class DragPiece extends Img {
    public DragPiece() {
      setWidth(48);
      setHeight(48);
      setCanDrop(true);
      setCanDrag(true);
      setDragAppearance(DragAppearance.TRACKER);
      setAppImgDir("pieces/48/");
    }
    
    public DragPiece(String src) {
      this();
      super.setSrc(src);
    }
  }

}

   
    
    
  

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