Hi Thomas,
Can an interface have attributes? I thought interfaces can only have
methods?
So if I make it:
@JsType(isNative = true, name = "?", namespace = JsPackage.GLOBAL)
public interface CrazyGamesUser {
}
I can't see how I can add the attributes:
public String username;
public String profilePictureUrl;
?
Thanks again.
On Monday, 13 January 2025 at 7:03:43 pm UTC+11 Thomas Broyer wrote:
> Use an interface rather than a class.
>
> See the note about castability in the javadoc:
> https://javadoc.io/doc/com.google.jsinterop/jsinterop-annotations/latest/jsinterop/annotations/JsType.html
>
> Rule of thumb is: use a class only if it maps to a "constructor" in JS,
> i.e. something you'll either create an instance of, or use in an
> "instanceof" check; for everything else (generally something you get from
> another API or "receive" in a callback), use an interface.
>
> In this case, I think you could also use name="Object".
>
> On Monday, January 13, 2025 at 7:47:28 AM UTC+1 [email protected]
> wrote:
>
>> Overlay types do work, and make it a little better:
>>
>> public class CrazyGamesUser extends JavaScriptObject {
>> protected CrazyGamesUser() {}
>> public final native String getUserName() /*-{ return this.username;
>> }-*/;
>> public final native String getProfilePictureUrl() /*-{ return
>> this.profilePictureUrl; }-*/;
>> }
>>
>> However, it would be great if JsInterop just worked, so I could just do:
>>
>> @JsType(isNative = true, namespace = JsPackage.GLOBAL)
>> public static class CrazyGamesUser {
>> public String username;
>> public String profilePictureUrl;
>> }
>>
>> Maybe I'm missing something?
>> On Monday, 13 January 2025 at 4:02:40 pm UTC+11 Craig Mitchell wrote:
>>
>>> I'm calling some existing JS that returns a JS Object which I've
>>> implemented in JsInterop:
>>>
>>> @JsType(isNative = true, namespace = "window.CrazyGames.SDK")
>>> public static class JsUser {
>>> public native Promise<CrazyGamesUser> getUser();
>>> }
>>>
>>> I can happily call it:
>>> sdk.user.getUser()
>>> .then(user -> {
>>> // Do something with the user
>>> return null;
>>> })
>>> .catch_(error -> {
>>> return null;
>>> });
>>>
>>> This issue is I'm struggling to work out how to define the return object
>>> "CrazyGamesUser". The actual JS object is just this:
>>> {
>>> "username": "SingingCheese.TLNU",
>>> "profilePictureUrl": "
>>> https://images.crazygames.com/userportal/avatars/4.png";
>>> }
>>>
>>> If I define it like this:
>>>
>>> @JsType(isNative = true, namespace = JsPackage.GLOBAL)
>>> public static class CrazyGamesUser {
>>> public String username;
>>> public String profilePictureUrl;
>>> }
>>>
>>> I get a java.lang.ClassCastException.
>>>
>>> So if I set the name to "?":
>>>
>>> @JsType(isNative = true, name = "?", namespace = JsPackage.GLOBAL)
>>> public static class CrazyGamesUser {
>>> public String username;
>>> public String profilePictureUrl;
>>> }
>>>
>>> Then I get a compile error:
>>> '?' can only be used as a name for native interfaces in the global
>>> namespace.
>>>
>>> But if I make it an interface, I can't have the member variables.
>>>
>>> If I do remove the member variables, it does work, and I can access them
>>> via some JSNI:
>>>
>>> public static native String getUsername(CrazyGamesUser instance) /*-{
>>> return instance.username;
>>> }-*/;
>>>
>>> But that's really ugly. What's the correct approach here?
>>>
>>> Thanks.
>>>
>>
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