Re: Upload an image via Drag and drop (GWT 2.5.1)

Hi Juan

I'm not sure if i understand you right. but i don't receive the event. It's clear in the sample i wrote only a message to the console, so i see if i receive the event. but the problem is: i'm not called. When you write "..you never register the handlers...", can you tell me where and how i can do this? i'm really sorry for my questions, but i searched the internet and i did not find an answer. 

And i'm sure, it must be a missing piece there.. (When it is possible to make a label-object drop-sensitive, then it must be possible to make this with an image object too..

Lorenzo

Am Freitag, 11. April 2014 15:38:18 UTC+2 schrieb Juan Pablo Gardella:

Hi,

It seems that you never register the handlers. All the implementations are empty.

Juan  

2014-04-11 10:30 GMT-03:00 lmedici <med...@pm-medici.ch>:

Hi

try to implement an upload of an image via drag and drop. i created a dialog with a preview image and a dropping zone. this is a label. with type of widget it works fine. i can drop the image form the desktop to my dialog and i receive the dropevent. i attached the required handlers to the label and this works perfect.

To make it better i shoudl attach the required dnd-handlers to the iimage object, so i can drop a new image over the old image. But here i have big problems. when i attach the handlers i don't receive the events. i tried to create a image-wrapperclass, but i don't get a desired result.. i can not see the difference between the label-widget and the image-widget. 

I'm very gratefull for every help...

Thanks for every hint

Here what i made:

this was the warapperimage...

package ch.pmm.coolartsclient.client.widgets.uploadmanager;

import com.google.gwt.event.dom.client.DragEndHandler;

import com.google.gwt.event.dom.client.DragEnterHandler;

import com.google.gwt.event.dom.client.DragHandler;

import com.google.gwt.event.dom.client.DragLeaveHandler;

import com.google.gwt.event.dom.client.DragOverHandler;

import com.google.gwt.event.dom.client.DragStartHandler;

import com.google.gwt.event.dom.client.DropHandler;

import com.google.gwt.event.dom.client.HasAllDragAndDropHandlers;

import com.google.gwt.event.shared.HandlerRegistration;

import com.smartgwt.client.widgets.Img;

import com.smartgwt.client.widgets.events.DropCompleteHandler;

public class DroppableImage extends Img implements HasAllDragAndDropHandlers, 

                                                  com.smartgwt.client.widgets.events.HasDropCompleteHandlers, 

                                                  com.smartgwt.client.widgets.events.HasDropHandlers, 

                                                  com.smartgwt.client.widgets.events.HasDropOverHandlers

{

  

  public DroppableImage()

  {

    super();   

  }

  

  public DroppableImage(String sSrc)

  {

    super(sSrc);

  }

  @Override

  public HandlerRegistration addDragEndHandler(DragEndHandler handler)

  {

    System.out.println("Image: addDragEndHandler");

    return null;

  }

  @Override

  public HandlerRegistration addDragEnterHandler(DragEnterHandler handler)

  {

    System.out.println("Image: addDragEnterHandler");

    return null;

  }

  @Override

  public HandlerRegistration addDragLeaveHandler(DragLeaveHandler handler)

  {

    System.out.println("Image: addDragLeaveHandler");

    return null;

  }

  @Override

  public HandlerRegistration addDragHandler(DragHandler handler)

  {

    System.out.println("Image: addDragHandler");

    return null;

  }

  @Override

  public HandlerRegistration addDragOverHandler(DragOverHandler handler)

  {

    System.out.println("Image: addDragOverHandler");

    return null;

  }

  @Override

  public HandlerRegistration addDragStartHandler(DragStartHandler handler)

  {

    System.out.println("Image: addDragStartHandler");

    return null;

  }

  @Override

  public HandlerRegistration addDropHandler(DropHandler handler)

  {

    System.out.println("Image: addDropHandler");

    return null;

  }

  @Override

  public HandlerRegistration addDropCompleteHandler(DropCompleteHandler handler)

  {

    System.out.println("Image: addDropCompleteHandler");

    return null;

  }

}

//------------------------------------------------------------------------------------------------------------------------------------------------------

and when i create the image in the DialogClass then i go to over this method...

  private void create_oImage(String sSrc) {

    if(sSrc.equals("")) m_oImage = new DroppableImage();

    else m_oImage = new DroppableImage(sSrc);

    

    m_oImage.addDropOverHandler(new DropOverHandler() {      

      @Override

      public void onDropOver(DropOverEvent event)

      {

        System.out.println("Image: Hello DropOverHandler is calling!!!");        

      }

    });            

    

    m_oImage.addDropHandler(new DropHandler() {

      

      @Override

      public void onDrop(DropEvent event)

      {

        System.out.println("Image: Hello DropHandler is calling!!!");        

      }

    });    

    

    m_oImage.addDropOutHandler(new DropOutHandler() {

      

      @Override

      public void onDropOut(DropOutEvent event)

      {

        System.out.println("image: dropOutHandler");

        

      }

    });

  }

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