Where to call an Action when user removes an uploaded image in GWTUpload? - gwt

Question

I am using GWTUpload , the library is in here https://code.google.com/p/gwtupload/
The Example code at client side found on that website has this structure:
// Attach an image to the pictures viewer
private OnLoadPreloadedImageHandler showImage = new OnLoadPreloadedImageHandler() {
public void onLoad(PreloadedImage image) {
//showImageFlowPanel code solution 1
image.setWidth("75px");
showImageFlowPanel.add(image);
}
};
private IUploader.OnFinishUploaderHandler onFinishUploaderHandler = new IUploader.OnFinishUploaderHandler() {
public void onFinish(IUploader uploader) {
if (uploader.getStatus() == Status.SUCCESS) {
new PreloadedImage(uploader.fileUrl(), showImage);
UploadedInfo info = uploader.getServerInfo();
String headShotImageUrl="http://"+Window.Location.getHost()+"/" +"images/uploaded/"+info.message;
//headShotImage code solution 2
if(!"".equals(headShotImageUrl) && UriUtils.isSafeUri(headShotImageUrl)){
headShotImage.setUrl(UriUtils.fromString(headShotImageUrl));
}
}
}
};
The example uses showImageFlowPanel (solution 1) to store the image but I want to store the image inside headShotImage which take the url after user uploaded image successfully, see the headShotImage (solution 2) code above.
Ok, the headShotImage code work fine but I dont know how to remove it when users remove the image. If I use showImageFlowPanel as in the solution 1 then the program remove the image automatically for me and I do not need to do anything.
So my question is "Where to call an Action when user removes an uploaded image in GWTUpload?"

Answer 1

You have to use setOnCancelUploaderHandler. Take a look to this code took from the demo.
// When the user clicks a cancel button we get an event
uploader.addOnCancelUploadHandler (
new IUploader.OnCancelUploaderHandler() {
public void onCancel(IUploader uploader) {
for (String iname : uploader.getServerMessage().getUploadedFieldNames()) {
// loadedImages is an temporary table where we are adding all uploaded files
// indexed by field name
Widget w = loadedImages.get(iname);
if (w != null) {
w.removeFromParent();
loadedImages.remove(uploader.getInputName());
}
}
}
});