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x.c
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/*
Interface with foreign windows in raw X11.
Copyright 2017-2018 Alexander Kulak.
This file is part of alttab program.
alttab is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
alttab is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with alttab. If not, see <http://www.gnu.org/licenses/>.
*/
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xft/Xft.h>
#include <X11/Xatom.h>
#include <stdbool.h>
#include <stdio.h>
#include "alttab.h"
#include "util.h"
extern Globals g;
extern Display* dpy;
extern int scr;
extern Window root;
// PRIVATE
//
// get window group leader
// to be used later. rewritten, not tested.
//
Window x_get_leader(Window win)
{
Window *retprop;
XWMHints *h;
Window leader = None;
retprop =
(Window *) get_x_property(win, XA_WINDOW, "WM_CLIENT_LEADER",
NULL);
if (retprop != NULL) {
leader = retprop[0];
XFree(retprop);
} else {
if (!(h = XGetWMHints(dpy, win)))
return None;
if (h->flags & WindowGroupHint)
leader = h->window_group;
}
return leader;
}
// PUBLIC
//
// set winlist,maxNdx,startNdx recursively using raw Xlib
// first call should be (win=root, reclevel=0)
//
int x_initWindowsInfoRecursive(Window win, int reclevel)
{
Window root, parent;
Window *children;
unsigned int nchildren, i;
// Window leader;
XWindowAttributes wa;
char* winname;
// check if window is "leader" or no prop, skip otherwise
// caveat: in rp, gvim leader has no file name and icon
// this doesn't work in raw X: leader may be not viewable.
// doesn't work in twm either: qutebrowser has meaningless leader.
/*
leader = 0;
if (g.option_wm == WM_TWM) {
leader = x_get_leader (win);
if (g.debug>1) {fprintf (stderr, "win: 0x%lx leader: 0x%lx\n", win, leader);}
}
*/
// in non-twm, add viewable only
// caveat: in rp, skips anything except of visible window
// probably add an option for this in WMs too?
wa.map_state = 0;
if (g.option_wm != WM_TWM)
XGetWindowAttributes(dpy, win, &wa);
// in twm-like, add only windows with a name
winname = NULL;
if (g.option_wm == WM_TWM) {
winname = get_x_property(win, XA_STRING, "WM_NAME", NULL);
}
// insert detailed window data in window list
if ( (g.option_wm == WM_TWM || wa.map_state == IsViewable)
&& reclevel != 0
&& (g.option_wm != WM_TWM || winname != NULL)
// && (g.option_wm != WM_TWM || leader == win)
) {
addWindowInfo(win, reclevel, 0, winname);
}
// skip children if max recursion level reached
if (g.option_max_reclevel != -1 && reclevel >= g.option_max_reclevel)
return 1;
// recursion
if (XQueryTree(dpy, win, &root, &parent, &children, &nchildren) == 0) {
if (g.debug > 0) {
fprintf(stderr, "can't get window tree for 0x%lx\n", win);
}
return 0;
}
for (i = 0; i < nchildren; ++i) {
x_initWindowsInfoRecursive(children[i], reclevel + 1);
}
if (nchildren > 0 && children) {
XFree(children);
}
if (reclevel == 0) {
g.startNdx = 0;
}
return 1;
}
//
// set window focus in raw X
//
int x_setFocus(int wndx)
{
Window w = g.winlist[wndx].id;
// 1. XWarpPointer
// If such WMs would be discovered that prevent our focus
// AND set their own focus via the pointer only.
// 2. XRaiseWindow required, but doesn't make window "Viewable"
XRaiseWindow(dpy, w);
// 3. XSetInputFocus
// "The specified focus window must be viewable at the time
// XSetInputFocus is called, or a BadMatch error results."
// This check is redundant: non-viewable windows isn't added to winlist in raw X anyway
XWindowAttributes att;
XGetWindowAttributes(dpy, w, &att);
if (att.map_state == IsViewable)
XSetInputFocus(dpy, w, RevertToParent, CurrentTime);
return 1;
}