Hey people, I''ve been working on a window manager to teach myself the ins & outs of Xlib. (I''m a newbie to this whole X programming) The strange thing is, when I do an XSelectInput on the root window with the SubstructureNotify flag, I somehow get double UnmapNotify messages/events (without matching MapNotify events, that is). They aren''t ''fake'' (send_event is False) so I don''t understand. How can a window be unmapped multiple times? When I don''t specify SubstructureNotify, but in stead I do XSelectInput on windows when they''re created I /don''t/ get double UnmapNotify messages. I hope someone can clarify this. --- Allow me to clear my head for once... Stop polluting the air!

It may not help much, but this is what my book says:

xmap, xunmap

When Generated
--------------
The X server generates MapNotify and UnmapNotify events when a windows changes state from unmapped to mapped or vice versa.

Select With
-----------
To receive these events on a single window, use StructureNotifyMask in the call to XSelectInput for the window. To receive these events for all children of a particular parent, specify the parent window ID and use SubstructureNotifyMask.

(XLib Programming Manual, V1, R4, P549)

So.......why the heck you would be getting UNMAP notify events when you -create- a window, is beyond me, but if you''re using SubstructureNotify, not StructureNotify, you''re probably getting the events off the child windows of your main window.

Incidentally, I''m curious, what''s involved in writing a window manager? I''ve never bothered to look it up. It is just a big hihg level window you have to deal with, or are there complicated things to do with colormaps you have to deal with...?

later.