No GUI roots detected after changing parent class

[nopalot]

Hello,

after changing the parent of a custom widget from Composite to SimplePanel or FlexTable, GWT designer (Build 14.03.2008) complains that it was unable to find any GUI elements in my source. If it happens, then theres no entry in eclipse error log view. Is this an intended behavior?

[Eric Clayberg]

after changing the parent of a custom widget from Composite to SimplePanel or FlexTable, GWT designer (Build 14.03.2008) complains that it was unable to find any GUI elements in my source. If it happens, then theres no entry in eclipse error log view. Is this an intended behavior?

Custom widgets should be subclassed from Composite; not from one of the Panel types. See...

http://code.google.com/webtoolkit/docum ... tomWidgets

GWT Designer can visually edit Composites, EntryPoints, DialogBoxes and PopupPanels. The tool does not allow visual editing of widget or panel classes (those can be used within editable GUI classes).

[nopalot]

Hi Eric,

thanks for the info.
Nop.

[peterblazejewicz]

Hello,

after changing the parent of a custom widget from Composite to SimplePanel or FlexTable, GWT designer (Build 14.03.2008) complains that it was unable to find any GUI elements in my source. If it happens, then theres no entry in eclipse error log view. Is this an intended behavior?

hi,
changing parent its not enough, construction of object is different in composite and in direct subclassing. You have to implement default constructor for GWTD which at least builds all required functionality of super class if not calling super() in it. Also subclassing GWT ui widget can be tricky becuase some fields and constructors are not directly avialable for subclassing ;(.

regads,
Peter

[Eric Clayberg]

For most user, subclassing Composite is the best way to go as suggested by Google.

Using GWT Designer's Composite wizard is an easy way to get started with this.

[eivenchan]

But use the Composite subclass, i can't use any method to find it's instance which like Panel's "findByID()" method.
Any advice?

[Eric Clayberg]

But use the Composite subclass, i can't use any method to find it's instance which like Panel's "findByID()" method.
Any advice?

I honestly have no idea what you are trying to do or what the problem might be.

I don't even see a "findByID()" method in Panel.