I have a peculiar problem (aren't they all?). A new program that uses X11 fails to get any ButtonRelease event reported to it after the XNextEvent call. That is, mouse clicks don't work. The program gets others, such as exposure and keyboard events, but not button press or release. Other programs running on the same hardware obviously do get all mouse clicks. Compounding the problem, this failure occurs under Ubuntu and Mint, but all events are reported under Raspbian -- that is, under Raspbian the failure does not occur.
This is the setup instruction:
Code:
i = XSelectInput(dpy,win, ExposureMask | KeyPressMask |
ButtonReleaseMask | KeyReleaseMask);
After issuance i contains 1.
I've read (seemingly relevant parts of) the X11 manual without gaining a clue. I'm hoping that someone else has experienced this problem and found the cause.
Would this question be more appropriate in another group? Which one?
--rLsj
Moderator's Comments:
Please use CODE tags when displaying sample input, sample output, and code segments.
Last edited by Don Cragun; 01-14-2017 at 06:00 PM..
Reason: Add CODE and ICODE tags.
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LEARN ABOUT HPUX
xselectinput
XSelectInput() XSelectInput()
Name
XSelectInput - select the event types to be sent to a window.
Synopsis
XSelectInput(display, w, event_mask)
Display *display;
Window w;
long event_mask;
Arguments
display Specifies a connection to an X server; returned from XOpenDisplay().
w Specifies the ID of the window interested in the events.
event_mask
Specifies the event mask. This mask is the bitwise OR of one or more of the valid event mask bits (see below).
Description
XSelectInput() defines which input events the window is interested in. If a window is not interested in a device event (button, key,
motion, or border crossing), it propagates up to the closest ancestor unless otherwise specified in the do_not_propagate_mask attribute.
The bits of the mask are defined in <X11/X.h> :
ButtonPressMask NoEventMask
ButtonReleaseMask KeyPressMask
EnterWindowMask KeyReleaseMask
LeaveWindowMask ExposureMask
PointerMotionMask VisibilityChangeMask
PointerMotionHintMask StructureNotifyMask
Button1MotionMask ResizeRedirectMask
Button2MotionMask SubstructureNotifyMask
Button3MotionMask SubstructureRedirectMask
Button4MotionMask FocusChangeMask
Button5MotionMask PropertyChangeMask
ButtonMotionMask ColormapChangeMask
KeymapStateMask OwnerGrabButtonMask
A call on XSelectInput() overrides any previous call on XSelectInput() for the same window from the same client but not for other clients.
Multiple clients can select input on the same window; their event_mask window attributes are disjoint. When an event is generated it will
be reported to all interested clients. However, only one client at a time can select for each of SubstructureRedirectMask, ResizeRedirect-
Mask, and ButtonPress.
If a window has both ButtonPressMask and ButtonReleaseMask selected, then a ButtonPress event in that window will automatically grab the
mouse until all buttons are released, with events sent to windows as described for XGrabPointer(). This ensures that a window will see the
ButtonRelease event corresponding to the ButtonPress event, even though the mouse may have exited the window in the meantime.
If PointerMotionMask is selected, events will be sent independent of the state of the mouse buttons. If instead, one or more of But-
ton1MotionMask, Button2MotionMask, Button3MotionMask, Button4MotionMask, or Button5MotionMask is selected, MotionNotify events will be gen-
erated only when one or more of the specified buttons is depressed.
XCreateWindow() and XChangeWindowAttributes() can also set the event_mask attribute.
For more information, see Volume One, Chapter 8, Events.
Errors
BadValue Specified event mask invalid.
BadWindow
See Also
XQLength(), XAllowEvents(), XCheckIfEvent(), XCheckMaskEvent(), XCheckTypedEvent(), XCheckTypedWindowEvent(), XCheckWindowEvent(),
XEventsQueued(), XGetInputFocus(), XGetMotionEvents(), XIfEvent(), XMaskEvent(), XNextEvent(), XPeekEvent(), XPeekIfEvent(), XPending(),
XPutBackEvent(), XSendEvent(), XSetInputFocus(), XSynchronize(), XWindowEvent().
Xlib - Input Handling XSelectInput()
01-14-2017
