> > Below, a version of what I was proposing deriving from Fl_Group as a > container widget to hold all the other widgets to be rendered into > the offscreen context. > > With this approach, the only derived widget is the "offscreen_group" > class, derived simply from Fl_Group. > All other widgets operate totally conventionally. > > Note that the buttons are actually rendered into the offscreen, > although they appear on screen and are fully functional (if you doubt > that, comment out the call to fl_copy_offscreen(0, 0, wo, ho, offscr, > 0, 0); and see what happens!) > > I think this was the effect that Fabio was aiming for? > > I haven't actually checked the offscreen to see that all the widgets > (even the non-visible ones) are fully rendered, I assume they are, > but if not then presumably judicious use of fl_no_clip() would > resolve that. > > --------------- (program left out)
Hi Ian, in the meanwhile I figured out what was wrong with my program, I was making mistakes with absolute/relative coordinates with fl_rectf and with fl_copy_offscreen, I already posted my solution. Indeed what I am aiming for is to print/screen capture/etc a whole widgets hierarchy contained in a Fl_Scroll (so a Fl_Group); I already was thinking about providing a draw() function to a derived class and enclose the Fl_Scroll::draw() with the offscreen operations, thanx for the example! The problem I am facing now is that I have generated with fluid a window with a scroll with a group; the group is the one holding the complex widget structure. In my case I should wrap the group's draw() call with the offscreen code ... but I can't! /usr/include/FL/Fl_Group.H:56: error: âvirtual void Fl_Group::draw()â is protected Is there a way to trigger the draw() method of a group from the outside? The alternative would be again deriving Fl_Group to customize draw(), but fluid doesn't know anything about my custom widgets, so I will not be able to use a Group with offscreen code from fluid. In short: how is it possible to trigger the protected draw() of the inner Group without dismantling the complex widget (built with fluid)? Fabio
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