> Many thanks for your suggestion. But the default callback of
> the button widget will be called after the release event. So
> the push event will not call the callback. How to change to
> make the push and release event can both call the callback
> function? Thanks.
Did you even try the demo I posted? If so, you will have found that it
does work, and the main button triggers the callback on both the press
and on the release, as you require.
The key is setting the "when" option for the button to "FL_WHEN_CHANGED"
like this:
bt_1->when(FL_WHEN_CHANGED);
I'm not sure what the exact syntax for fltk-2 is, but it is basically
similar.
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