XI_Leave missing

[Artem Ananiev]

Hi, Peter,

following your suggestion, I have verified `xinput --test-xi2` works 
correctly and reports all the XI_Leave events. After another half an 
hour I have finally found the problem: the eventmask.mask was too small, 
so XI_Leave (which corresponds to 1 << 8) was skipped, while XI_Enter (1 
<< 7) was handled fine.

Thanks,

Artem

On 3/2/2010 7:26 AM, Peter Hutterer wrote:
> On Sat, Feb 27, 2010 at 04:00:08PM +0300, Artem Ananiev wrote:
>> Hello,
>>
>> with a simple test - see the code snippet below - I successfully
>> receive XI_Enter notifications for my window, but XI_Leave are
>> missed. Are there any problems with the test, or something else is
>> wrong?
>>
>> ----
>>
>>    display = XOpenDisplay(NULL);
>>
>>    root = RootWindow(display, 0);
>>    window = XCreateSimpleWindow(display, root,
>>                                 100, 100, 320, 240,
>>                                 BlackPixel(display, 0),
>>                                 WhitePixel(display, 0));
>>
>>    eventmask.deviceid = XIAllMasterDevices;
>>    eventmask.mask_len = sizeof(mask);
>>    eventmask.mask = mask;
>>
>>    XISetMask(mask, XI_Enter);
>>    XISetMask(mask, XI_Leave);
>>    XISelectEvents(display, window,&eventmask, 1);
>>
>>    XMapWindow(display, window);
>>    XSync(display, True);
>>
>>    while (1) {
>>      XNextEvent(display,&xev);
>>      if ((xev.xcookie.type == GenericEvent)&&
>>          (xev.xcookie.extension == xinput_opcode)&&
>>          XGetEventData(display,&xev.xcookie)) {
>>        switch (xev.xcookie.evtype) {
>>          case XI_Enter:
>>            fprintf(stderr, "XI_Enter\n");
>>            break;
>>          case XI_Leave:
>>            fprintf(stderr, "XI_Leave\n");
>>            break;
>>        }
>>        XFreeEventData(display,&xev.xcookie);
>>      }
>>    }
>>
>> ----
>>
>> The problem is reproducible both with a single master device and
>> with multiple ones. If I modify the test to listen for regular
>> EnterNotify and LeaveNotify, these are received correctly (but
>> XI_Leave is still missed).
>
> weird. I copy/pasted your code (no changes, just added the missing
> declarations and one missing param to XCreateSimpleWindow) I'm getting
> events just as required.
>
> do you see enter/leave events with "xinput --test-xi2"?
> is the value of xinput_opcode off by any chance? try to hardcode it, you can
> get the value from "xdpyinfo -ext XInputExtension | grep opcode"
>
> Cheers,
>    Peter
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