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Bug 4630

Summary: Missing x11 _NET_WM_WINDOW_TYPEs
Product: SDL Reporter: toqozz
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED WONTFIX QA Contact: Sam Lantinga <slouken>
Severity: enhancement    
Priority: P2 CC: icculus
Version: HG 2.1   
Hardware: x86_64   
OS: Linux   

Description toqozz 2019-05-17 03:24:19 UTC 
SDL2 currently supports the following window flags on x11:

- "_NET_WM_WINDOW_TYPE_UTILITY"
- "_NET_WM_WINDOW_TYPE_TOOLTIP"
- "_NET_WM_WINDOW_TYPE_POPUP_MENU"
- "_NET_WM_WINDOW_TYPE_NORMAL"

The following flags are available in the standard (see: https://standards.freedesktop.org/wm-spec/wm-spec-latest.html#idm140200472629520):

- "_NET_WM_WINDOW_TYPE_DESKTOP"
- "_NET_WM_WINDOW_TYPE_DOCK"
- "_NET_WM_WINDOW_TYPE_TOOLBAR"
- "_NET_WM_WINDOW_TYPE_MENU"
- "_NET_WM_WINDOW_TYPE_UTILITY"
- "_NET_WM_WINDOW_TYPE_SPLASH"
- "_NET_WM_WINDOW_TYPE_DIALOG"
- "_NET_WM_WINDOW_TYPE_DROPDOWN_MENU"
- "_NET_WM_WINDOW_TYPE_POPUP_MENU"
- "_NET_WM_WINDOW_TYPE_TOOLTIP"
- "_NET_WM_WINDOW_TYPE_NOTIFICATION"
- "_NET_WM_WINDOW_TYPE_COMBO"
- "_NET_WM_WINDOW_TYPE_DND"
- "_NET_WM_WINDOW_TYPE_NORMAL"

Supporting the missing flags should be quite trivial; are these out of scope for SDL?

I have a program which requires the "_NET_WM_WINDOW_TYPE_NOTIFICATION" flag, which marks a window as non-resizable, and not able to grab focus from the window manager.  Currently, (I think), it is not possible to make a window with this behavior using solely SDL's windowing.
Comment 1 Ryan C. Gordon 2019-05-18 16:36:07 UTC 
We don't currently have any intention to add more of these; the ones we added were to make it feasible to build a reasonable GUI toolkit on top of SDL (which Epic Games did with their Slate UI in Unreal Engine 4), but we aren't looking to replace something like GTK+ or Qt for any possible desktop app's functionality.

Each of these consists of a non-trivial amount of effort to expose them as cross-platform APIs, and often we end up doing some really ugly tapdancing to make the Windows, Mac, and X11 versions work similarly.

--ryan.