289 lines
6.7 KiB
Groff
289 lines
6.7 KiB
Groff
'\" t
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.\" Title: xsetdevicefocus
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.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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.\" Generator: DocBook XSL Stylesheets v1.74.3 <http://docbook.sf.net/>
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.\" Date: 10/02/2009
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.\" Manual: [FIXME: manual]
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.\" Source: [FIXME: source]
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.\" Language: English
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.\"
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.TH "XSETDEVICEFOCUS" "libmansuffix" "10/02/2009" "[FIXME: source]" "[FIXME: manual]"
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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XSetDeviceFocus, XGetDeviceFocus \- control extension input device focus
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.SH "SYNOPSIS"
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.sp
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.nf
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#include <X11/extensions/XInput\&.h>
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.fi
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.sp
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.nf
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XSetDeviceFocus( Display *display,
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XDevice *device,
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Window focus,
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int revert_to,
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Time time);
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.fi
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.sp
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.nf
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XGetDeviceFocus( Display *display,
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XDevice *device,
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Window *focus_return,
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int *revert_to_return,
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int * time_return);
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.fi
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.sp
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Arguments
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.sp
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.nf
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display
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Specifies the connection to the X server\&.
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.fi
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.sp
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.nf
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device
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Specifies the device whose focus is to be queried or
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changed\&.
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.fi
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.sp
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.nf
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focus
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Specifies the window, PointerRoot, FollowKeyboard,or
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None\&.
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.fi
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.sp
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.nf
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focus_return
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Returns the focus window, PointerRoot, FollowKeyboard,or
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None\&.
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.fi
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.sp
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.nf
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revert_to
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Specifies where the input focus reverts to if the window
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becomes notviewable\&.You can pass RevertToParent,
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RevertToPointerRoot, RevertToFollowKeyboard,or
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RevertToNone\&.
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.fi
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.sp
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.nf
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revert_to_return
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Returns the current focus state RevertToParent,
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RevertToPointerRoot, RevertToFollowKeyboard,or
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RevertToNone\&.
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.fi
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.sp
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.nf
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time_return
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Returns the last_focus_time for the device\&.
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.fi
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.sp
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.nf
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time
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Specifies the time\&.You can pass either a timestamp or
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CurrentTime\&.
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.fi
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.SH "DESCRIPTION"
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XSetDeviceFocus request changes the focus of the specified
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device and its last\-focus\-change time\&. It has no effect if the
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specified time is earlier than the current last\-focus\-change
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time or is later than the current X server time\&. Otherwise, the
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last\-focus\-change time is set to the specified time CurrentTime
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is replaced by the current X server time)\&. XSetDeviceFocus
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causes the X server to generate DeviceFocusIn and
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DeviceFocusOut events\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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Depending on the focus argument, the following occurs:
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* If focus is None , all device events are discarded until a
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new focus window is set, and the revert_to argument is
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ignored\&.
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* If focus is a window, it becomes the device\'s focus window\&.
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If a generated device event would normally be reported to
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this window or one of its inferiors, the event is reported
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as usual\&. Otherwise, the event is reported relative to the
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focus window\&.
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* If focus is PointerRoot, the focus window is dynamically
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taken to be the root window of whatever screen the pointer
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is on at each event from the specified device\&. In this
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case, the revert_to argument is ignored\&.
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* If focus is FollowKeyboard, the focus window is dynamically
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taken to be the window to which the X keyboard focus is set
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at each input event\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The specified focus window must be viewable at the time
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XSetDeviceFocus is called, or a BadMatch error results\&. If the
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focus window later becomes not viewable, the X server evaluates
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the revert_to argument to determine the new focus window as
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follows:
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* If revert_to is RevertToParent, the focus reverts to the
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parent (or the closest viewable ancestor), and the new
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revert_to value is taken to be RevertToNone\&.
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* If revert_to is RevertToPointerRoot,
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RevertToFollowKeyboard, or RevertToNone, the focus reverts
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to PointerRoot, FollowKeyboard, or None, respectively\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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When the focus reverts, the X server generates DeviceFocusIn
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and DeviceFocusOut events, but the last\-focus\-change time is
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not affected\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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Input extension devices are not required to support the ability
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to be focused\&. Attempting to set the focus of a device that
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does not support this request will result in a BadMatch error\&.
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Whether or not given device can support this request can be
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determined by the information returned by XOpenDevice\&. For
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those devices that support focus, XOpenDevice will return an
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XInputClassInfo structure with the input_class field equal to
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the constant FocusClass (defined in the file XI\&.h)\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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XSetDeviceFocus can generate BadDevice, BadMatch, BadValue, and
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BadWindow errors\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XGetDeviceFocus request returns the focus window and the
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current focus state\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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Not all input extension devices can be focused\&. Attempting to
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query the focus state of a device that can\'t be focused results
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in a BadMatch error\&. A device that can be focused returns
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information for input Class Focus when an XOpenDevice request
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is made\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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XGetDeviceFocus can generate BadDevice, and BadMatch errors\&.
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.fi
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.if n \{\
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.RE
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.\}
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.SH "DIAGNOSTICS"
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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BadDevice
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An invalid device was specified\&. The specified device
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does not exist or has not been opened by this client via
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XOpenInputDevice\&. This error may also occur if the
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specified device is the X keyboard or X pointer device\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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BadValue
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Some numeric value falls outside the range of values
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accepted by the request\&. Unless a specific range is
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specified for an argument, the full range defined by the
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argument\'s type is accepted\&. Any argument defined as a
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set of alternatives can generate this error\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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BadWindow
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A value for a Window argument does not name a defined
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Window\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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BadMatch
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This error may occur if an XGetDeviceFocus or
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XSetDeviceFocus request was made specifying a device
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that the server implementation does not allow to be
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focused\&.
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.fi
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.if n \{\
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.RE
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.\}
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