I've been looking into this same problem and what I've found is a
couple of issues.
First being that you are not loading the image (ie. not pulling the
image from the server), only setting the image properties (eg. url,
width, height, etc), so in order to do what you want you would have to
call the drawImage in a LoadHandler event:
final Image image = new Image(mapResources.map());
image.addLoadHandler(new LoadHandler() {
@Override
public void onLoad(LoadEvent event) {
final ImageElement e = ImageElement.as(image.getElement());
contextMap.drawImage(e, x, y);
}
});
But this now leads to the second problem - what's going to call the
load? The only solution I've come up with thus far is subsequently
adding a RootPanel.get().add(image) which adds the image to the DOM
which in turns loads up the image. From there I simply added an
'image.removeFromParent' line in the onLoad method.
final Image image = new Image(mapResources.map());
image.addLoadHandler(new LoadHandler() {
@Override
public void onLoad(LoadEvent event) {
final ImageElement e = ImageElement.as(image.getElement());
contextMap.drawImage(e, x, y);
image.removeFromParent();
}
});
RootPanel.get().add(image); // triggers the image load
But this solution is hardly ideal. I understand that unless the image
is part of the DOM, the image isn't technically part of the hosting
page, which is why it will not load/show.
The idea of an image preloader is probably the way to go, I'm going to
look into this myself. There was the ImageLoader helper class from
the gwt incubator that I had previously used, but it didn't fit well
with the ClientBundle concept, and I don't think it survived the move
into the 2.2 branch.
On Feb 6, 10:46 am, Jambi <[email protected]> wrote:
> Hej Thomas,
>
> it´s the same with your solution. The Image won´t appear on the
> canvas. Maybe it is a bug since the canvas api is still experimental?
> Maybe I should try a different approach to implement an image
> preloader.
>
> On Feb 6, 11:50 am, Thomas Broyer <[email protected]> wrote:
>
>
>
>
>
>
>
> > Or, without creating an Image widget:
> > AbstractImagePrototype.create(imageResource).createElement()
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