1X11::Protocol::ChooseWiUnsdeorw(C3o)ntributed Perl DocumXe1n1t:a:tPiroontocol::ChooseWindow(3)
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NAME

6       X11::Protocol::ChooseWindow -- user click to choose window
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SYNOPSIS

9        use X11::Protocol::ChooseWindow;
10        my $client_window = X11::Protocol::ChooseWindow->choose (X => $X);
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DESCRIPTION

13       This spot of code lets the user click on a toplevel window to choose
14       it, in a similar style to the "xwininfo" or "xkill" programs.
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16   Implementation
17       The choose is implemented in a similar way to the "xwininfo" etc
18       programs.  It consists of "GrabPointer()" on the root window, wait for
19       a "ButtonPress" and "ButtonRelease" from the user, get the frame window
20       from the "ButtonPress" event, then the client window under there from
21       "frame_window_to_client()" of "X11::Protocol::WM".
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23       "KeyPress" events are not used and they go to the focus window in the
24       usual way.  This can be good in a command line program since it lets
25       the user press "^C" ("SIGINT") in an "xterm" or similar.  Perhaps in
26       the future there could be an option to watch for "Esc" to cancel or
27       some such.
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29       A virtual root per "root_to_virtual_root()" in "X11::Protocol::WM" is
30       used if present.  This helps "ChooseWindow" work with "amiwm" and
31       similar virtual root window managers.
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FUNCTIONS

34       The following "choose()" is in class method style with the intention of
35       perhaps in the future having objects of type
36       "X11::Protocol::ChooseWindow" holding state and advanced by events
37       supplied by an external main loop.
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39   Choosing
40       "$window = X11::Protocol::ChooseWindow->choose (key=>value,...)"
41           Read a user button press to choose a toplevel window.  The
42           key/value options are as follows,
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44               X        => X11::Protocol object
45               display  => string ":0:0" etc
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47               screen   => integer, eg. 0
48               root     => XID of root window
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50               time     => integer server timestamp
51               event    => hashref of event initiating the choose
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53               cursor       => XID of cursor
54               cursor_glyph => integer glyph for cursor font
55               cursor_name  => string name from cursor font
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57           "X" or "display" gives the server, or the default is to open the
58           "DISPLAY" environment variable.  "X" for an "X11::Protocol" object
59           is usual, but sometimes it can make sense to open a new connection
60           just to choose.
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62           "root" or "screen" gives the root window to choose on, or the
63           default is the current screen of $X, which in turn defaults to the
64           screen part of the display name.  If there's a window manager
65           virtual root then that's automatically used as necessary.
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67           "time" or the time field in "event" is a server timestamp for the
68           "GrabPointer()".  This guards against stealing a grab from another
69           client if badly lagged.  Omitted or "undef" means "CurrentTime".
70           In a command line program there might be no initiating event,
71           making "CurrentTime" all that's possible.
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73           "cursor" etc is the mouse pointer cursor to show during the choose,
74           as a visual indication to the user.  The default is a "crosshair".
75           "cursor_name" or "cursor_glyph" are from the usual cursor font.
76           See X11::CursorFont for available names.  For example perhaps the
77           "exchange" cursor to choose a window for some sort of swap or flip,
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79               $window = X11::Protocol::ChooseWindow->choose
80                           (X => $X,
81                            cursor_name => "exchange");
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83           A "cursor" XID can be created by any client as usual.  Don't forget
84           to flush if creating a cursor from one connection, so it's ready
85           for use from another.
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SEE ALSO

88       X11::Protocol, X11::Protocol::WM, X11::CursorFont
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90       xwininfo(1), xkill(1), and their dsimple.c "Select_Window()" code
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92       "Inter-Client Communication Conventions Manual" section "WM_STATE
93       Property" for notes on using "WM_STATE" to identify client windows.
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HOME PAGE

96       <http://user42.tuxfamily.org/x11-protocol-other/index.html>
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LICENSE

99       Copyright 2010, 2011, 2012, 2013, 2014, 2016, 2017, 2019 Kevin Ryde
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101       X11-Protocol-Other is free software; you can redistribute it and/or
102       modify it under the terms of the GNU General Public License as
103       published by the Free Software Foundation; either version 3, or (at
104       your option) any later version.
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106       X11-Protocol-Other is distributed in the hope that it will be useful,
107       but WITHOUT ANY WARRANTY; without even the implied warranty of
108       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
109       General Public License for more details.
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111       You should have received a copy of the GNU General Public License along
112       with X11-Protocol-Other.  If not, see <http://www.gnu.org/licenses/>.
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116perl v5.34.0                      2022-01-21    X11::Protocol::ChooseWindow(3)
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