Here is a list of all documented files with brief descriptions:

apps
libwlclient
client.c
dblbuf.c
dblbuf.h
icon.c
icon.h
libwlclient.h
xdg_toplevel.c
xdg_toplevel.h
wlmclock.c
wlmeyes.c
include
backend
backend.h
output.h
output_config.h
output_manager.h
toolkit
base.h
bordered.h
box.h
buffer.h
button.h
container.h
dock.h
element.h
fsm.h
gfxbuf.h
image.h
input.h
layer.h
menu.h
menu_item.h
panel.h
popup.h
primitives.h
rectangle.h
resizebar.h
resizebar_area.h
root.h
style.h
surface.h
test.h
tile.h
titlebar.h
titlebar_button.h
titlebar_title.h
toolkit.h
util.h
window.h
workspace.h
src
backend
backend.c
output.c
output_config.c
output_manager.c
toolkit
base.c
bordered.c
box.c
buffer.c
button.c
container.c
dock.c
element.c
fsm.c
gfxbuf.c
image.c
input.c
layer.c
menu.c
menu_item.c
panel.c
popup.c
primitives.c
rectangle.c
resizebar.c
resizebar_area.c
root.c
style.c
surface.c
test.c
tile.c
titlebar.c
titlebar_button.c
titlebar_title.c
util.c
window.c
workspace.c
action.c
action.h
action_item.c
action_item.h
background.c
background.h
backtrace.c
backtrace.h
clip.c
clip.h
config.c
config.h
corner.c
corner.h
cursor.c
cursor.h
dock.c
dock.h
files.c
files.h
icon_manager.c
icon_manager.h
idle.c
idle.h
input_observation.c
input_observation.h
keyboard.c
keyboard.h
launcher.c
launcher.h
layer_panel.c
layer_panel.h
layer_shell.c
layer_shell.h
lock_mgr.c
lock_mgr.h
root_menu.c
root_menu.h
server.c
server.h
subprocess_monitor.c
subprocess_monitor.h
task_list.c
task_list.h
tl_menu.c
tl_menu.h
wlmaker.c
xdg_decoration.c
xdg_decoration.h
xdg_popup.c
xdg_popup.h
xdg_shell.c
xdg_shell.h
xdg_toplevel.c
xdg_toplevel.h
xwl.c
xwl.h
xwl_surface.c
xwl_surface.h