import java.util.ArrayList;
import java.util.List;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.PopupPanel;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.Label;
/**
*
* @author ldsjdy
*
*/
public class Loading extends PopupPanel
{
private static Loading me;
private List workingObjects = new ArrayList();
private boolean shown;
private Loading()
{
// super(false, true);
Img img = new Img("loading_smartgwt.gif",30,30);
Grid grid = new Grid(1,2);
grid.setWidget(0, 0, img);
Label label = new Label("Loading........");
label.setHeight(30);
grid.setWidget(0, 1, label);
// grid.setWidget(0, 1, label);
setWidget(grid);
}
public static Loading get()
{
if (me == null)
{
me = new Loading();
}
return me;
}
public AsyncCallback startWorking(AsyncCallback callback)
{
AsyncCallbackWrapper wrapper = new AsyncCallbackWrapper(callback);
this.workingObjects.add(wrapper);
if (!this.shown)
{
this.shown = true;
this.center();
}
return wrapper;
}
private void endWorking(AsyncCallbackWrapper wrapper)
{
this.workingObjects.remove(wrapper);
if (this.shown && (this.workingObjects.size() <= 0))
{
this.shown = false;
this.setModal(false);
this.hide();
}
}
private class AsyncCallbackWrapper implements AsyncCallback
{
private AsyncCallback callback;
private AsyncCallbackWrapper(AsyncCallback callback)
{
this.callback = callback;
}
public void onFailure(Throwable t)
{
Loading.get().endWorking(this);
this.callback.onFailure(t);
}
public void onSuccess(Object obj)
{
this.callback.onSuccess(obj);
Loading.get().endWorking(this);
}
}
}