hi
i'm developing a small software for neuronal image analysis. I have a problem
using fltk callbacks:
i have a main class containing my GUI, and the callbacks for the GUI as member
functions (through the "static/inline" pair of functions, as described in doc)
here's the deal: when the user hits the "filter" button on my gui, i'd like a
new window to open, presenting some filtering options; then the user hits "run"
on that window, and image filtering is in process.
so far my code is:
[in my main class.cpp]
..
void Filter_callback(){
filterWindow->show(); //filterWindow derives from Fl_Window
image->Filter(filterWindow->GetFilterParameters());
}
..
the problem is that the filterWindow will only show after completing the whole
Filter_callback, so i can't retrieve my filterparameters as the user hasn't had
the chance yet to see those parameters.
i have thought of several solutions:
1. some way to interrupt the current callback (Filter_callback) in order to
actually show my filterWindow and wait for this filterwindow callbacks. The
rest of Filter_callback would then be executed as user hits 'run' on the
filterWindow, which then disappears. Is there a way to do that with fltk ?
2. add some kind of observer so that my Filter_callback would only have to show
my filterwindow, and change some member variable that would be observed by
Fl::run(). That way, filter_callback completes and my filterWindow is shown;
then Fl::run sees my variable has changed, thus calls some function to perform
my filtering. is it possible to do so with fltk ? (i searched on add_fd,
handler() etc in fltk, but i'm not sure how these functions work...)
3. pass a pointer to my main class when creating my filterWindow; i tried this,
but still getting compilation errors (i'll be more specific if that's the
solution i have to choose, but i'd rather avoid that)
4. think of a whole new OO design... something like having a class just for
handling all callbacks coming from any window of my program... but that means i
still have to find a way to make a callback communicate with a function
declared in his parent...
5. any idea ??
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