Xlib mouse events and ButtonPressMask Post: 302375193

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Top Forums Programming Xlib mouse events and ButtonPressMask Post 302375193 by abhinav.zoso on Friday 27th of November 2009 01:12:48 AM

11-27-2009

Registered User

Xlib mouse events and ButtonPressMask

I have written a simple program which will report key press and release events for a particular window. In my case, it is mostly the terminal since I invoke the program from the terminal. I am able to get the key press and release events taking place in the terminal window (I have used XSelectInput() with KeyPressMask and KeyReleaseMask on the terminal) but the same is not working with ButtonPress and ButtonRelease. Not just these, but any events related to the mouse are not being reported. Any idea why this is happening?

Code:

#include
#include
#include
#include
#include
#include

int main() {
Display *display = XOpenDisplay(NULL);
KeySym k;
int revert_to;
Window window;
XEvent event;

XGetInputFocus(display, &window, &revert_to);
XSelectInput(display, window, KeyPressMask | KeyReleaseMask | ButtonPressMask | ButtonReleaseMask);

while(1)
{
XNextEvent(display,&event);
switch (event.type) {

case KeyPress : printf("Key Pressed\n"); break;
case KeyRelease : printf("Key Released\n"); break;
case ButtonPress : printf("Button Pressed\n"); break;
case ButtonRelease : printf("Button Released\n"); break;
case EnterNotify : printf("Enter\n"); break;
}
}
XCloseDisplay(display);
return 0;
}

abhinav.zoso

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xselectinput

XSelectInput(3X11) MIT X11R4 XSelectInput(3X11)

Name
XSelectInput - select input events

Syntax
XSelectInput(display, w, event_mask)
Display *display;
Window w;
long event_mask;

Arguments
display Specifies the connection to the X server.

event_mask
Specifies the event mask.

w Specifies the window whose events you are interested in.

Description
The function requests that the X server report the events associated with the specified event mask. Initially, X will not report any of
these events. Events are reported relative to a window. If a window is not interested in a device event, it usually propagates to the
closest ancestor that is interested, unless the do_not_propagate mask prohibits it.

Setting the event-mask attribute of a window overrides any previous call for the same window but not for other clients. Multiple clients
can select for the same events on the same window with the following restrictions:

o Multiple clients can select events on the same window because their event masks are disjoint. When the X server generates an event,
it reports it to all interested clients.

o Only one client at a time can select or events, which are associated with the event mask

o Only one client at a time can select a event, which is associated with the event mask

The server reports the event to all interested clients.

can generate a error.

Diagnostics
A value for a Window argument does not name a defined Window.

See Also
X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys

XSelectInput(3X11)