XTestExtension Problem.

[Robin Watson]

Hello, I was hoping someone might be able to help me out with a 
problem I am having with the XTest Extension. 

What I am trying to do is select on ButtonPress events that occur 
anywhere on the desktop. I am doing this by creating a transparent 
window that covers the entire desktop, and selects on ButtonPressMask. 
In my event loop I am unmapping this window (or moving it, both work). 
and then using XTestFakeMotionEvent to pass the event back to the 
desktop without this window in the way. 

This seems to work well, but only when I have a delay on the 
XTestFakeMotionEvent of more then 100. and sometimes at this value it 
is unreliable. CurrentTime, or 0 do not work atall. 200+, works all of 
the time, however there is a noticeable lag between the actual button 
press event and the time the underlying window recieves it. 

I have tried using XFlush() in various places, but this doesn't seem 
to help. 

Below is a test project that should show my problem. Any assistance 
would be greatly appriciated. 

Thanks

#include <X11/extensions/XTest.h> 
#include <X11/Xutil.h> 
#include <stdio.h> 

int main() 
{ 

        Display* display = XOpenDisplay(NULL); 
        int done; 
        XSetWindowAttributes attr; 
        attr.do_not_propagate_mask = 0; 
        attr.override_redirect     = True; 
        attr.cursor = None; 
        attr.border_pixel = BlackPixel(display, 0); 
        attr.event_mask = PointerMotionMask | 
                                                 ButtonPressMask |
ButtonReleaseMask | 
                                                 KeyPressMask |
KeyReleaseMask | 
                                                 KeymapStateMask |
PropertyChangeMask; 

        Window root,child; 
        int rootx,rooty,winx,winy; 
        unsigned int maskret; 
        XQueryPointer(display,DefaultRootWindow 
(display),&root,&child,&rootx,&rooty,&winx,&winy,&maskret); 
        Window window = XCreateWindow(display, DefaultRootWindow(display), 
rootx, rooty,50, 50, 5, CopyFromParent , 
                                                        InputOutput,
CopyFromParent, 
                                                         CWBorderPixel|
CWDontPropagate | CWEventMask | 
                                                        CWOverrideRedirect |
CWCursor, 
                                                        &attr); 
        XSelectInput(display,window,PointerMotionMask|LeaveWindowMask| 
ButtonPressMask); 
    XMapRaised(display, window); 

        for (done =0;!done;) 
        { 
                XEvent event; 
                XNextEvent(display,&event); 
        if (event.type == ButtonPress) 
                { 

                        XUnmapWindow(display,window); 
                        printf("%s\n","1"); 
                        XButtonEvent buttonEvent = *(XButtonEvent*)&event; 
                        printf("X : %d, Y :
%d\n",buttonEvent.x_root,buttonEvent.y_root); 
 
XTestFakeButtonEvent(display,buttonEvent.button,true,200); 
 
XTestFakeButtonEvent(display,buttonEvent.button,false,200); 
                        XFlush(display); 
                        XMapRaised(display,window); 
                        printf("%s\n","ButtonPress"); 
                } 
        } 
        return 0; 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.x.org/archives/xorg/attachments/20100110/16ac7e5c/attachment.html>