xlib and keyboard events Post: 302721459

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Top Forums UNIX for Advanced & Expert Users xlib and keyboard events Post 302721459 by N7DR on Thursday 25th of October 2012 12:15:56 PM

10-25-2012

Registered User

After a lot more experimentation, I discovered that the trick is to use:

Code:

XGrabKey(<Display*>, AnyKey, AnyModifier, <window>, false, GrabModeAsync, GrabModeAsync);

So far, that seems to do exactly what I needed.

I do wish, though, that I had been able to find an xlib reflector or some similar resource. I felt like I was spending an awful of time flailing around just trying stuff, and a few words from an xlib expert could have pointed me in the right direction without my having to go through all that pain. The xlib documentation is pretty good, but even so there are plenty of ambiguities in the language, so much of the time I had to resort to trying combinations of plausible functions until I hit the one that worked.

DGPickett: I think you misunderstand my issue, although I tried to make it as clear as I could. If I understand you correctly, you seem to be saying that I shouldn't be involved in X at all, and in particular not an xterm. But the entire context of the problem is within an xterm, so I think that X has to be involved in the solution.

N7DR

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tk_grab

Tk_Grab(3)						       Tk Library Procedures							Tk_Grab(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_Grab, Tk_Ungrab - manipulate grab state in an application

SYNOPSIS

       #include <tk.h>

       int
       Tk_Grab(interp, tkwin, grabGlobal)

       void
       Tk_Ungrab(tkwin)

ARGUMENTS

       Tcl_Interp *interp (in)			 Interpreter to use for error reporting

       Tk_Window tkwin (in)			 Window on whose behalf the pointer is to be grabbed or released

       int grabGlobal (in)			 Boolean indicating whether the grab is global or application local
_________________________________________________________________

DESCRIPTION

       These  functions are used to set or release a global or application local grab.	When a grab is set on a particular window in a Tk applica-
       tion, mouse and keyboard events can only be received by that window and its descendants.  Mouse and keyboard events for windows outside the
       tree  rooted  at tkwin will be redirected to tkwin.  If the grab is global, then all mouse and keyboard events for windows outside the tree
       rooted at tkwin (even those intended for windows in other applications) will be redirected to tkwin.  If the  grab  is  application  local,
       only  mouse  and  keyboard  events  intended for a windows within the same application (but outside the tree rooted at tkwin) will be redi-
       rected.

       Tk_Grab sets a grab on a particular window.  Tkwin specifies the window on whose behalf the pointer is to be grabbed.  GrabGlobal indicates
       whether	the  grab should be global or application local; if it is non-zero, it means the grab should be global.  Normally, Tk_Grab returns
       TCL_OK; if an error occurs and the grab cannot be set, TCL_ERROR is returned and an error message is left if interp's  result.	Once  this
       call  completes	successfully,  no  window outside the tree rooted at tkwin will receive pointer- or keyboard-related events until the next
       call to Tk_Ungrab.  If a previous grab was in effect within the application, then it is replaced with a new one.

       Tcl_Ungrab releases a grab on the mouse pointer and keyboard, if there is one set on the window given by tkwin.	Once a grab  is  released,
       pointer and keyboard events will start being delivered to other windows again.

KEYWORDS

       grab, window

Tk																	Tk_Grab(3)