Hi Julian, I work with GWT 2.3 and i just see in the documentation : (http://google-web-toolkit.googlecode.com/svn/javadoc/2.3/com/google/ gwt/dom/client/CanvasElement.html)
constructor protected CanvasElement() It means that you can derive your own class for CanvasElement. Adding it in a GWT container works for me. I agree with you : I don't understand why there is also a Canvas class, and why the constructor is private ? In my opinion, Google is perfectionnist, and has provided a cross- browser test class to check if <canvas> is supported by client browser, in order to let the developper to test and take a decision if there is no browser support. May be that's why thi class exists. I don't think it's a bug as Thomas says. Regards Karim Duran On 11 août, 22:06, Julian <[email protected]> wrote: > I want to wrap a CanvasElement (<canvas> in HTML) in an Canvas widget. > > Many widgets (e.g. Label) have a static method SomeWidget.wrap(Element) for > wrapping an existing DOM element. > I imagine Canvas does not feature such a method because not all browser > support <canvas> and therefore the user should be forced to go > through createIfSupported(). > > Unfortunately the constructor in Canvas is private, which means that Canvas > can not be subclassed. (There isn't any constructor available in the derived > class.) > > Code snippets of createIfSupported and the constructor in Canvas: > > public static Canvas createIfSupported() { > // check if canvas is supported; if it is not supported: return null > return new Canvas(element); > } > > private Canvas(CanvasElement element) { > setElement(element); > } > > I ended up copying the Canvas class and making the constructor public. > > Is there a better way to do this? > If not, what is the reasoning behind it (besides that it might not be > supported)? > > I am using version 2.4.0.rc1. > > Thanks, > Julian -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
