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Diffstat (limited to 'doc/strut-and-related-updating.txt')
| -rw-r--r-- | doc/strut-and-related-updating.txt | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/doc/strut-and-related-updating.txt b/doc/strut-and-related-updating.txt new file mode 100644 index 00000000..2f4ba128 --- /dev/null +++ b/doc/strut-and-related-updating.txt @@ -0,0 +1,53 @@ +How updates happen for struts, workareas, and screen/xinerama regions/edges + One of three things causes meta_window_update_struts to be called + (a) initial window map (window.c:meta_window_new_with_attrs()) + (b) update of _net_wm_strut* properties (window.c:process_property_notify()) + (c) screen.c (meta_screen_resize_func()) + meta_window_update_struts (MetaWindow *window) + - Gets new list of struts from window properties + - Makes sure window doesn't single-handedly fill the screen + - records new struts if different and calls invalidate_work_areas() + invalidate_work_areas () + - Calls meta_workspace_invalidate_work_area() for each workspace it's on + meta_workspace_invalidate_work_area() + - Cleans out all strut lists + - queues all windows for resizing + - Calls meta_screen_queue_workarea_recalc (workspace->screen); + meta_screen_queue_workarea_recalc () + - Adds set_work_area_idle_func() as an idle handler + + set_work_area_idle_func() + - Calls set_work_area_hint() + set_work_area_hint() + - Calls meta_workspace_get_work_area_all_xineramas() + - Sets _NET_WORKAREA property + meta_workspace_get_work_area_all_xineramas() + - Calls ensure_work_areas_validated() + ensure_work_areas_validated() + - Loops over xineramas + - Loops over windows, then struts: + - Adds struts to list first time through xinerama loop + - Find the amount of the strut on the given xinerama for <dir>_strut + - Just max the amount of the strut with the all_<dir>_strut + - Makes sure there's a non-empty xinerama workarea + - Record the xinerama workarea + - Make sure there's a non-empty screen workarea + - Record the screen workarea + - Cache the spanning rects for the screen and xinerama regions + + Alternatively to all the above, if the idle function for the screen + has not yet fired, constraints.c:setup_constraint_info() can call + either workspace.c:meta_workspace_get_onscreen_region() or + workspace.c:meta_workspace_get_onxinerama_region() which in turn + call workspace.c:ensure_work_areas_validated(). + +Meaning of related functions that might be difficult to tell apart: + screen.c:meta_screen_get_current_xinerama () + - Finds out which xinerama the mouse is on with an XQueryPointer + window.c:meta_window_get_work_area_current_xinerama() + window.c:meta_window_get_work_area_for_xinerama() + window.c:meta_window_get_work_area_all_xineramas () + - All three are for finding the intersection of workareas across + multiple workspaces so that placement of windows can be + determined in such a way that they remain in the workarea for + all workspaces that they are on. |