[fltk/fltk] Extend FLTK with a cross-platform way to undock and dock widget groups (PR #1603)
ManoloFLTK
02:07 Sep 07
This PR corresponds to discussion #1257 with the same title.
This PR extends FLTK with class Fl_Dockable_Group, derived from Fl_Group, and defined as: a group that can be detached from its parent, dragged with the mouse to some destination in the GUI, and docked there.
Docking widget groups in a Wayland client application poses a difficult problem because Wayland completely hides the position of a window in a display which prevents the detection of whether a window is moved above a given part of the application's GUI. Two major Wayland compositors, Gnome's Mutter and KDE's Kwin, have recently decided to implement a new Wayland protocol, XDG toplevel drag, designed specifically to support widget docking. This PR solves the docking problem under Wayland using this new protocol, and has a backup mechanism based on Wayland's drag-and-drop feature to approximate widget docking in absence of the XDG toplevel drag protocol to support early versions of Wayland.
Class Fl_Dockable_Group hides all differences between how platforms handle undocking and docking.
A test program, dock_undock, is added to provide usage examples. Command make dock_undock
after cmake configuration and generation of the FLTK fork will build this program.
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