In GWT, How to use custom widget tag in an .ui.xml file with and without parameters for the tag in the same file
custom-widgets, gwt, uibinder
Solution
UiBinder will only ever use a single constructor for a given widget: either its zero-arg constructor, or a `@UiConstructor` (I'm surprised that you say it works when using either one or the other call but not both: one should fail in every case, and one should succeed in every case; if you haven't annotated a constructor with `@UiConstructor`, then `<my:CustomWid/>` should always work and `<my:CustomWid a="str1" b="str2"/>` should always fail)
There are two solutions here:
- use setters for the `a` and `b` attributes (`void setA(String a)` and `void setB(String b)`)), and possibly check later (say, in `onLoad` or `onAttach`) that you have either none or both of A and B, but not one without the other (if that's your rule).
- use `@UiField(provided = true)` when you need to use the other constructor (if you choose to have UiBinder use the zero-arg constructor –i.e. no `@UiConstructor`–, then that means you'll have to move the `a="str1" b="str2"` from the XML to the Java code: `@UiField(provided = true) CustomWid myCustomWid = new CustomWid("str1", "str2")`).
The first option has my preference.
Problem
I am creating a custom widget, say "CustomWid" in UiBinder. And in CustomWid.java file I am writing two constructors one with zero args like `CustomWid(){....}` ``` another with some args like ``` `CustomWid(String a,String b){......}` So,Now I am using my custom widget in another .ui.xml file,in that .ui.xml file it is working fine when we give `<my:CustomWid/>` alone, and also fine when we give like `<my:CustomWid a="srt1" b="str2"/>` alone But "MY PROBLEM" is whenever I am trying to give both the tags in the one .ui.xml as `<my:CustomWid/> <my:CustomWid a="str1" b="str2"/> ` Now it is throwing error when i am using both types of tags in a single .ui.xml I mean How to use my custom widget tag like a prdefined tag? I am using `@uiConstructor`, but it showing error Please developers... I need answer as early as possible