I solved this way:
1) i "hard code" a DIV (id="wait_glass1") in my html, and set this
style for it: style="position: absolute; visibility:visible; top: 0px;
left: 0px; width: 100%; height: 100%; background-color:#000000;
filter: Alpha(Opacity=50); opacity: 0.5;".
2) hardcode a second DIV (id="wait_glass2") with
style="position:absolute; left:0px; top:0px; width:100%; height:
100%;", this DIV contents my "loading, please wait" message
I hardcode both DIV's in html because them are showed inmediatly,
before GWT loads
3) surround your delayed code this way (for example):
public void onModuleLoad()
{
// force image preload
Image.prefetch("img/carro.gif");
Image.prefetch("img/centro.gif");
Image.prefetch("img/der.gif");
Image.prefetch("img/izq.gif");
GWT.runAsync(new RunAsyncCallback() {
@Override
public void onSuccess()
{
.... code to be executed
delayed ......
RootPanel.get("wait_glass1").getElement().getStyle().setVisibility(Visibility.HIDDEN);
RootPanel.get("wait_glass2").getElement().getStyle().setVisibility(Visibility.HIDDEN);
}
public void onFailure(Throwable reason)
{
Window.alert("error loading program");
}
});
}
this code shows wait_glass1 and wait_glass2 during download, and hides
them after all delayed code is downloaded and executed, and after all
your images are downloaded
On 1 feb, 01:40, zixzigma <[email protected]> wrote:
> it is a common practice to display a "Loading" message/icon
> when we have an operation that possibly would take some time to complete.
> for example when retrieving data from Datastore, etc.
>
> I was wondering how we can do the same for Activities/Places.
> in GWT MVP, when navigating from one place to another,
> an activity stops and another one gets started,
> however at times there is a slight delay in between.
>
> do you have any suggestions on how we can display a "Loading" message,
> when transitioning between Activity/Places ?
>
> Thank You
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