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On 4/29/24 11:14 Gonzalo Garramulo wrote:
El 28/4/24 a las 19:45, 'Albrecht Schlosser' via fltk.coredev
escribió:
Summary:
(1) You should fix your program (see above) and ...
See this new version of the program that no longer crashes:
https://mega.nz/file/aHYWkabR#EUFPKmDA_87NSLKekWjH8fHb4kmpaKz8kht_KjNsyZc
To avoid the crashes besides your suggestions I cleaned up the
code and added clamping of the thumbnail subwindow to the parent
windows' borders.
Yeah, looks good (much better than before) - but unfortunately it
doesn't work on Wayland (as expected). The problem of Wayland is
that you can't position windows absolutely on the screen and you
don't get real (screen) coordinates of windows and events.
Good news: an even simplified version works fine on all
current FLTK platforms. See attached file 'timeline.diff'.
Note to Gonzalo and others: subwindows don't have borders anyway,
hence 'clear_border();' could be
removed.
Although this particular solution of a user's issue is going OT now
I decided to post my solution here for others seeing this later. The
attached file 'timeline2.cxx' demonstrates how a /subwindow/
(called 'thumbnailWindow') can
be opened (shown) and moved above the main window while moving (or
dragging) the mouse. Thanks to Gonzalo for the working example,
BTW.. The point here is that 'thumbnailWindow'
is a subwindow and not another independent window which can't be
positioned easily on Wayland (we have a working solution for menus
etc. but there's no API for user programs).
The mechanism used in this example is that the subwindow is the last
child of the main window (thus always drawn on top). It overlaps
other widgets of the main window but this is tolerable in this case.
The code in
```
thumbnailWindow->parent()->redraw(); // needed for Wayland
```
is not optimal because it may draw more than needed but I'm leaving
this as an exercise for the reader.
(2) I will fix the potential NULL pointer
dereference.
Yes, do so just in case, as it is still a bug. Thanks!
Welcome, and done in commit
b402b6a8397f9fc13157813d39d505ea9ead00f0.
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