XGrabButton(3)

1XGrabButton(3)                  XLIB FUNCTIONS                  XGrabButton(3)
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NAME

6       XGrabButton, XUngrabButton - grab pointer buttons
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SYNTAX

9       int  XGrabButton(Display  *display,  unsigned  int button, unsigned int
10              modifiers, Window grab_window, Bool owner_events,  unsigned  int
11              event_mask,  int pointer_mode, keyboard_mode, Window confine_to,
12              Cursor cursor);
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14       int XUngrabButton(Display *display, unsigned int button,  unsigned  int
15              modifiers, Window grab_window);
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ARGUMENTS

18       button    Specifies  the  pointer  button  that is to be grabbed or re‐
19                 leased or AnyButton.
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21       confine_to
22                 Specifies the window to confine the pointer in or None.
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24       cursor    Specifies the cursor that is to be displayed or None.
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26       display   Specifies the connection to the X server.
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28       event_mask
29                 Specifies which pointer events are reported  to  the  client.
30                 The  mask  is  the  bitwise inclusive OR of the valid pointer
31                 event mask bits.
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33       grab_window
34                 Specifies the grab window.
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36       keyboard_mode
37                 Specifies further processing of  keyboard  events.   You  can
38                 pass GrabModeSync or GrabModeAsync.
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40       modifiers Specifies  the  set  of keymasks or AnyModifier.  The mask is
41                 the bitwise inclusive OR of the valid keymask bits.
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43       owner_events
44                 Specifies a Boolean value that indicates whether the  pointer
45                 events  are  to be reported as usual or reported with respect
46                 to the grab window if selected by the event mask.
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48       pointer_mode
49                 Specifies further processing of pointer events.  You can pass
50                 GrabModeSync or GrabModeAsync.
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DESCRIPTION

53       The  XGrabButton  function  establishes a passive grab.  In the future,
54       the pointer is  actively  grabbed  (as  for  XGrabPointer),  the  last-
55       pointer-grab  time  is  set to the time at which the button was pressed
56       (as transmitted in the ButtonPress event), and the ButtonPress event is
57       reported if all of the following conditions are true:
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59       •    The  pointer is not grabbed, and the specified button is logically
60            pressed when the specified modifier keys are logically  down,  and
61            no other buttons or modifier keys are logically down.
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63       •    The grab_window contains the pointer.
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65       •    The confine_to window (if any) is viewable.
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67       •    A  passive  grab on the same button/key combination does not exist
68            on any ancestor of grab_window.
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70       The interpretation of the remaining arguments is as  for  XGrabPointer.
71       The  active  grab is terminated automatically when the logical state of
72       the pointer has all buttons released (independent of the state  of  the
73       logical  modifier  keys),  at  which point a ButtonRelease event is re‐
74       ported to the grabbing window.
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76       Note that the logical state of a device (as  seen  by  client  applica‐
77       tions) may lag the physical state if device event processing is frozen.
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79       This  request  overrides  all  previous grabs by the same client on the
80       same button/key combinations on the same window.  A modifiers  of  Any‐
81       Modifier  is  equivalent  to  issuing the grab request for all possible
82       modifier combinations (including the combination of no modifiers).   It
83       is  not  required  that all modifiers specified have currently assigned
84       KeyCodes.  A button of AnyButton is equivalent to issuing  the  request
85       for all possible buttons.  Otherwise, it is not required that the spec‐
86       ified button currently be assigned to a physical button.
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88       If some other client has already issued a  XGrabButton  with  the  same
89       button/key  combination  on the same window, a BadAccess error results.
90       When using AnyModifier or AnyButton, the request fails completely,  and
91       a BadAccess error results (no grabs are established) if there is a con‐
92       flicting grab for any combination.  XGrabButton has no effect on an ac‐
93       tive grab.
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95       XGrabButton can generate BadCursor, BadValue, and BadWindow errors.
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97       The  XUngrabButton function releases the passive button/key combination
98       on the specified window if it was grabbed by this client.  A  modifiers
99       of AnyModifier is equivalent to issuing the ungrab request for all pos‐
100       sible modifier combinations, including the combination of no modifiers.
101       A button of AnyButton is equivalent to issuing the request for all pos‐
102       sible buttons.  XUngrabButton has no effect on an active grab.
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104       XUngrabButton can generate BadValue and BadWindow errors.
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DIAGNOSTICS

107       BadCursor A value for a Cursor argument does not name a defined Cursor.
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109       BadValue  Some numeric value falls outside the range of values accepted
110                 by  the request.  Unless a specific range is specified for an
111                 argument, the full range defined by the  argument's  type  is
112                 accepted.   Any argument defined as a set of alternatives can
113                 generate this error.
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115       BadWindow A value for a Window argument does not name a defined Window.
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NAME

SYNTAX

ARGUMENTS

DESCRIPTION

DIAGNOSTICS

SEE ALSO