X11 error from home grown application

[Geoffrey]

Aaron Plattner wrote:
> On Wed, May 19, 2010 at 01:02:35PM -0700, Keith Packard wrote:
>> On Wed, 19 May 2010 14:58:16 -0400, Geoffrey <lists at serioustechnology.com> wrote:
>>
>>> Can you define 'viewable'?
>> From the X protocol glossary:
>>
>> .LP
>> \fBViewable\fP
>> .IN "Viewable" "" "@DEF@"
>> .IP
>> A window is viewable if it and all of its ancestors are mapped.
>> This does not imply that any portion of the window is actually visible.
>> Graphics requests can be performed on a window when it is not viewable,
>> but output will not be retained unless the server is maintaining
>> backing store.
> 
> That seems misleading... the server makes a distinction between 'realized'
> and 'viewable':
> 
> 1. The root window is always realized.
> 2. A window is realized if it's mapped and its parent is realized.
> 3. A window is viewable if it's realized and its class is InputOutput.
> 
> SetInputFocus only checks that the window is realized, so it should work
> with InputOnly windows.  The comment is pretty fantastic:
> 
>         /* It is a match error to try to set the input focus to an
>         unviewable window. */
>         if(!focusWin->realized)
>             return(BadMatch);

So something like this could well be producing this error?

if (ctrl->MODE == Browse) ClickButton (ctrl->b_create);

As the ClickButton would try and set focus on this window.


-- 
Until later, Geoffrey

"I predict future happiness for America if they can prevent
the government from wasting the labors of the people under
the pretense of taking care of them."
- Thomas Jefferson