On 03/18/13 08:00, memoryl...@tin.it wrote:
> Hi all,
> forgive me but here is another question, not-so-evident for me.
>
> You have to realize a blinking message, or an object which periodically swaps
> two images :
> think of an alarm icon.
> The alarm is sounding, and the icon keeps alternating red/yellow horn images
> until the user pushes the ack button.
>
> Use a timer to blink... but things are not always "smooth blinking".
> Not a big problem, anyway... just would like to know if there is a clever way
> to assure a smooth blinking
> (usually we are speaking of small objects).
Make sure the window is an Fl_Double_Window, so that it uses
double-buffering.
Beyond that, just have the timer callback:
1) Change the the thing being blinked to "on" or "off"
(hide()/show() can work)
2) Call redraw() on the widget that handles the background of
the widget in question.
If the widget draws its own background, then tell /it/ to
redraw. If the widget
is 'see through' (eg. text label with FL_NO_BOX), then tell
the closest parent
that handles the background to redraw()
or call redraw() on the parent that draws the background
under the widget
3) Call Fl::repeat_timeout() to reset the timer for the next
trigger
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