e5ac5678dc
Unfortunately (sigh), the KDE Wayland compositor does not seem to support correctly, that is, as described by the Wayland protocol, popup windows that are taller than the display : there is no means to make it draw such popup so that part of it is above the screen top, whereas the 3 other tested compositors (Mutter, Weston, Sway) don't have this problem. This commit implements a new approach to draw tall menu windows, and uses it only with the KDE compositor : instead of asking the compositor to slide the menu window up, the menu window remains at a fixed position and the graphics inside the window is slided up. This requires to add a member variable, int offset_y, to class menuwindow, that gets used only for the Wayland platform and that contains the vertical offset by which graphics to the menu window is moved, expressed in FLTK units. An accessor to the address of this member variable is added to class Fl_Window_Driver.
README - Fast Light Tool Kit (FLTK) Version 1.4.0
WHAT IS FLTK?
The Fast Light Tool Kit is a cross-platform C++ GUI toolkit for
UNIX®/Linux® (X11 or Wayland), Microsoft® Windows®, and macOS®.
FLTK provides modern GUI functionality without the bloat and
supports 3D graphics via OpenGL® and its built-in GLUT
emulation. It was originally developed by Mr. Bill Spitzak
and is currently maintained by a small group of developers
across the world with a central repository on GitHub.
For more information see README.txt:
https://github.com/fltk/fltk/blob/master/README.txt
