Local vs Global ghandles

[David Kibble]

Hi Guys.

Could you please give me an official steer on the use of local GHandles. Your examples and Studio always generate global scope vars for all GHandles, but is there actually any problem in taking the approach of using local (within a function) GHandles for graphic entities which are transient and modal such as dialogue boxes? For example you could have a function;

showDialogBox(...)
{
  GHandle container;
  GHandle button1;
  GHandle button2;

etc etc
  gwinShow(container);

  <event loop waiting and processing modal events for button 1 and 2>

  gwinDestroy(container);
}

I prefer this style wise as it contains the variables and logic, reduces the sheer volume of global vars which you end up with on a large UI project and creates a more easily reusable component.

But - are there any negative side effects within uGFX of doing this? I ask because I'm getting some odd behavior now on a large UI where container hierarchies are not redrawn properly and before I start diving into my code, it occurred to me I should check the above pattern with you guys.

Thanks

[inmarket]

There is no problem with that - a ghandle is effectively just a void *. Just be aware that if you exit the function without destroying the window you have lost the pointer to the window. That may however be perfectly acceptable eg a label on a container. After creation there may be no future need to access the label seperately from its container.

[David Kibble]

Many thanks