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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