On Sun, Mar 3, 2019 at 6:26 AM Emmanuele Bassi via gtk-devel-list < email@example.com> wrote:
> On Sun, 3 Mar 2019 at 12:58, John Emmas <j...@creativepost.co.uk> wrote: > >> > For example... let's say the widget is a top-level window. If it's >> currently displayed on screen but there's some other window hiding it >> (maybe from a totally different app) would 'is_visible()' return true or >> false? >> > > That's entirely different, and you should have said so at the very > beginning of the thread. Yes, both "visible" and "mapped" would be set to > true because you called show() on the window, and a window has no parents, > so once it's visible and realized, it'll be mapped as well; there is no way > to know, from a toolkit perspective, if a top level is being partially, or > totally, covered by some other window, either in the same process or from a > different process. That information is only available to the window manager. > John should really know that there's code to do this (to the best extent possible) within the Ardour source code at libs/gtkmm2ext/visibility_tracker.cc :))) It works (to whatever extent it does work) by handling GtkEventVisibility notifications. Hopefully this is still possible in GTK3 ?
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