Simulating a mouse click

[Markus Kramer]

Thanks for the help.
I was able to fix this now by setting the time member correctly. I had 
it set to CurrentTime before, but that didn't fix it.

Cheers, Markus

On 03.11.2011 00:34, Peter Hutterer wrote:
> On Wed, Nov 02, 2011 at 03:27:42PM +0100, Markus Kramer wrote:
>> Hi,
>> I'm attempting to use xlib to simulate a series of mouse clicks in an
>> application (gedit). I found some posts that describe how to do this
>> and it essentially works. I can do left clicks on buttons and so on.
>> But if I generate a click on the menu bar, a menu opens and something
>> breaks and no further ButtonPress/ButtonRelease events that I send
>> will be processed by the application.
>>
>> When debugging it with xtrace I noticed that my events look slightly
>> different than real left click events.
>>
>> Real:
>> ButtonPress(4) [1]button=left button(0x01) [4]time=0x03752355
>> [8]root=0x00000102 [12]event=0x010000a3 [16]child=None(0x00000000)
>> [20]root-x=428 [22]root-y=33 [24]event-x=295 [26]event-y=10 state=0
>> [30]same-screen=true(0x01)
>>
>>
>> My simulated event:
>> SendEvent [1]propagate=true(0x01)
>> [4]destination=PointerWindow(0x00000000) event-mask=ButtonPress
>> ButtonPress(4) [1]button=left button(0x01) [4]time=0x00000000
>> [8]root=0x00000102 [12]event=0x012000a3 [16]child=None(0x00000000)
>> [20]root-x=407 [22]root-y=40 [24]event-x=274 [26]event-y=19 state=0
>> [30]same-screen=true(0x01)
>>
>>
>> The field "event" of the real event says 0x010000a3 mine is
>> 0x012000a3. What is this "event" field about? It is not part of the
>> ButtonPress struct.
>
> "event" is the window the event happens on. once you send a button down on a
> menu, the client usually grabs the device that sent the event and the event
> window from then on is the grab window, not necessarily the window
> underneath the cursor.
>
> If you're tyring to emulate click events, I recommend to use the XTest
> extension instead, it's much simpler to handle.
>
> Cheers,
>    Peter
>
>>
>> This is the code that I use to simulate a left click:
>>
>> ---------------------------------------------------
>> XEvent event;
>> memset(&event, 0, sizeof(XEvent));
>>
>> XWindowAttributes attr;
>> XGetWindowAttributes(dpy, windowId,&attr);
>> event.type = ButtonPress;
>> event.xbutton.same_screen = TRUE;
>> event.xbutton.root = root;
>> event.xbutton.window = windowId;
>> event.xbutton.subwindow = None;
>> event.xbutton.x = x;
>> event.xbutton.y = y;
>> event.xbutton.x_root = attr.x + x;
>> event.xbutton.y_root = attr.y + y;
>> event.xbutton.state = 0;
>> event.xbutton.button = Button1;
>>
>> XSendEvent(dpy, PointerWindow, True, ButtonPressMask,&event);
>> XFlush(dpy);
>>
>> // the same for ButtonRelease, with modified state and mask
>> --------------------------------------------------
>>
>>
>> Thanks in advance.
>> Markus
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