Xwindow stack level

[Thomas Lübking]

On Mittwoch, 16. April 2014 11:39:51 CEST, LIDE wrote:
> I decode video and show it.I create a Independent window to 
> show my video.The window I create cover the parent window's 
> contents.For example, the Right-click menu in parent window is 
> covered by the video window.I'm confused with that.Do you have 
> any suggests for that?


In general, please keep asking xorg at freedesktop.org


There're four possible causes:
1) the window is tagged "override_redirect" (not managed by the WM, thus not put into a managed stack, but simply on top of everything)
2) the rightclick menu is NOT tagged "override_redirect" and considered below by the WindowManager
3) There is no WM (thus all windows are considered "override_redirect" and new one will simply open on top of everything unless the client restacks them itself, ie. plays WM)
4) there's no compositor, the video uses an overlay technique (xv/vdpau) and th popups color matches the color key of the overlay (the GPU will replace the matching color in the matching region with the video content, bypassing X11)

A window manager would be sth. like fvwm, kwin, compiz, metacity, lwm, e16, openbox, mutter and a dozen other variants - desktop environments like gnome, kde, xfce, lxde usually run a WM, but if you just start an X11 display server, there won't be one - and "something else" (your client, i assume) has to control the stacking order of all relevant client windows.

Cheers,
Thomas