XIQueryPointer.man   [plain text]

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.\"     Title: xiquerypointer
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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.\"      Date: 03/18/2011
.\"    Manual: \ \&
.\"    Source: \ \&
.\"  Language: English
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.TH "XIQUERYPOINTER" "libmansuffix" "03/18/2011" "\ \&" "\ \&"
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.SH "NAME"
XIQueryPointer \- get device pointer coordinates\&.
.SH "SYNOPSIS"
.sp
.nf
#include <X11/extensions/XInput2\&.h>
.fi
.sp
.nf
Bool XIQueryPointer( Display *display,
                     int deviceid,
                     Window win,
                     Window *root_return,
                     Window *child_return,
                     double *root_x_return,
                     double *root_y_return,
                     double *win_x_return,
                     double *win_y_return,
                     XIButtonState *buttons_return,
                     XIModifierState *modifiers_return,
                     XIGroupState *group_return);
.fi
.sp
.nf
buttons_return
       Returns the current button state\&.
.fi
.sp
.nf
child_return
       Returns the child window that the pointer is located in,
       if any\&.
.fi
.sp
.nf
deviceid
       Specifies the device to query\&.
.fi
.sp
.nf
display
       Specifies the connection to the X server\&.
.fi
.sp
.nf
group_return
       Returns the current group state\&.
.fi
.sp
.nf
modifiers_return
       Returns the current state of the modifier keys\&.
.fi
.sp
.nf
root_return
       Returns the root window that the pointer is in\&.
.fi
.sp
.nf
root_x_return, root_y_return
       Return the pointer coordinates relative to the root
       window\*(Aqs origin\&.
.fi
.sp
.nf
win
       Specifies the window\&.
.fi
.sp
.nf
win_x_return, win_y_return
       Return the pointer coordinates relative to the specified
       window\&.
.fi
.SH "DESCRIPTION"
.sp
.if n \{\
.RS 4
.\}
.nf
The XIQueryPointer function returns the root window the
device\*(Aqs pointer is logically on and the pointer coordinates
relative to the root window\*(Aqs origin\&. If XIQueryPointer returns
False, the pointer is not on the same screen as the specified
window, and XIQueryPointer returns None to child_return and
zero to win_x_return and win_y_return\&. If XIQueryPointer
returns True, the pointer coordinates returned to win_x_return
and win_y_return are relative to the origin of the specified
window\&. In this case, XIQueryPointer returns the child that
contains the pointer, if any, or else None to child_return\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
XIQueryPointer returns the current logical state of the buttons
buttons_return\&. The keyboard paired with the master pointer is
selected to obtain the data for modifiers_return and
group_return\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
The mask field in buttons_return is dynamically allocated and
must be freed by the caller\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
XIQueryPointer is identical to XQueryPointer but specifies the
device explicitly\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
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.nf
XIQueryPointer can generate a BadDevice and a BadWindow error\&.
.fi
.if n \{\
.RE
.\}
.SH "DIAGNOSTICS"
.sp
.if n \{\
.RS 4
.\}
.nf
BadDevice
       An invalid device was specified\&. The device does not
       exist or is not a pointer device\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
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.nf
BadWindow
       A value for a Window argument does not name a defined
       window\&.
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.sp
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.RS 4
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.nf
XQueryPointer(libmansuffix)
.fi
.if n \{\
.RE
.\}