xenocara/app/xwininfo/clientwin.c

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/*
* Copyright 2007 Kim woelders
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <xcb/xcb.h>
#include <xcb/xproto.h>
#include <stdlib.h>
#include <string.h>
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#include "clientwin.h"
#include "dsimple.h"
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static xcb_atom_t atom_wm_state = XCB_ATOM_NONE;
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/*
* Check if window has given property
*/
static Bool
Window_Has_Property(xcb_connection_t * dpy, xcb_window_t win, xcb_atom_t atom)
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{
xcb_get_property_cookie_t prop_cookie;
xcb_get_property_reply_t *prop_reply;
prop_cookie = xcb_get_property (dpy, False, win, atom,
XCB_GET_PROPERTY_TYPE_ANY, 0, 0);
prop_reply = xcb_get_property_reply (dpy, prop_cookie, NULL);
if (prop_reply) {
xcb_atom_t reply_type = prop_reply->type;
free (prop_reply);
if (reply_type != XCB_NONE)
return True;
}
return False;
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}
/*
* Check if window is viewable
*/
static Bool
Window_Is_Viewable(xcb_connection_t * dpy, xcb_window_t win)
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{
Bool ok = False;
xcb_get_window_attributes_cookie_t attr_cookie;
xcb_get_window_attributes_reply_t *xwa;
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attr_cookie = xcb_get_window_attributes (dpy, win);
xwa = xcb_get_window_attributes_reply (dpy, attr_cookie, NULL);
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if (xwa) {
ok = (xwa->_class == XCB_WINDOW_CLASS_INPUT_OUTPUT) &&
(xwa->map_state == XCB_MAP_STATE_VIEWABLE);
free (xwa);
}
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return ok;
}
/*
* Find a window that has WM_STATE set in the window tree below win.
* Unmapped/unviewable windows are not considered valid matches.
* Children are searched in top-down stacking order.
* The first matching window is returned, None if no match is found.
*/
static xcb_window_t
Find_Client_In_Children(xcb_connection_t * dpy, xcb_window_t win)
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{
xcb_query_tree_cookie_t qt_cookie;
xcb_query_tree_reply_t *tree;
xcb_window_t *children;
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unsigned int n_children;
int i;
qt_cookie = xcb_query_tree (dpy, win);
tree = xcb_query_tree_reply (dpy, qt_cookie, NULL);
if (!tree)
return XCB_WINDOW_NONE;
n_children = xcb_query_tree_children_length (tree);
if (!n_children) {
free (tree);
return XCB_WINDOW_NONE;
}
children = xcb_query_tree_children (tree);
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/* Check each child for WM_STATE and other validity */
win = XCB_WINDOW_NONE;
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for (i = (int) n_children - 1; i >= 0; i--) {
if (!Window_Is_Viewable(dpy, children[i])) {
/* Don't bother descending into this one */
children[i] = XCB_WINDOW_NONE;
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continue;
}
if (!Window_Has_Property(dpy, children[i], atom_wm_state))
continue;
/* Got one */
win = children[i];
goto done;
}
/* No children matched, now descend into each child */
for (i = (int) n_children - 1; i >= 0; i--) {
if (children[i] == XCB_WINDOW_NONE)
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continue;
win = Find_Client_In_Children(dpy, children[i]);
if (win != XCB_WINDOW_NONE)
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break;
}
done:
free (tree); /* includes children */
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return win;
}
/*
* Find virtual roots (_NET_VIRTUAL_ROOTS)
*/
static xcb_window_t *
Find_Roots(xcb_connection_t * dpy, xcb_window_t root, unsigned int *num)
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{
xcb_atom_t atom_virtual_root;
xcb_get_property_cookie_t prop_cookie;
xcb_get_property_reply_t *prop_reply;
xcb_window_t *prop_ret = NULL;
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*num = 0;
atom_virtual_root = Get_Atom (dpy, "_NET_VIRTUAL_ROOTS");
if (atom_virtual_root == XCB_ATOM_NONE)
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return NULL;
prop_cookie = xcb_get_property (dpy, False, root, atom_virtual_root,
XCB_ATOM_WINDOW, 0, 0x7fffffff);
prop_reply = xcb_get_property_reply (dpy, prop_cookie, NULL);
if (!prop_reply)
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return NULL;
if ((prop_reply->value_len > 0) && (prop_reply->type == XCB_ATOM_WINDOW)
&& (prop_reply->format == 32)) {
int length = xcb_get_property_value_length (prop_reply);
prop_ret = malloc(length);
if (prop_ret) {
memcpy (prop_ret, xcb_get_property_value(prop_reply), length);
*num = prop_reply->value_len;
}
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}
free (prop_reply);
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return prop_ret;
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}
/*
* Find child window at pointer location
*/
static xcb_window_t
Find_Child_At_Pointer(xcb_connection_t * dpy, xcb_window_t win)
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{
xcb_window_t child_return = XCB_WINDOW_NONE;
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xcb_query_pointer_cookie_t qp_cookie;
xcb_query_pointer_reply_t *qp_reply;
qp_cookie = xcb_query_pointer (dpy, win);
qp_reply = xcb_query_pointer_reply (dpy, qp_cookie, NULL);
if (qp_reply) {
child_return = qp_reply->child;
free (qp_reply);
}
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return child_return;
}
/*
* Find client window at pointer location
*
* root is the root window.
* subwin is the subwindow reported by a ButtonPress event on root.
*
* If the WM uses virtual roots subwin may be a virtual root.
* If so, we descend the window stack at the pointer location and assume the
* child is the client or one of its WM frame windows.
* This will of course work only if the virtual roots are children of the real
* root.
*/
xcb_window_t
Find_Client(xcb_connection_t * dpy, xcb_window_t root, xcb_window_t subwin)
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{
xcb_window_t *roots;
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unsigned int i, n_roots;
xcb_window_t win;
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/* Check if subwin is a virtual root */
roots = Find_Roots(dpy, root, &n_roots);
for (i = 0; i < n_roots; i++) {
if (subwin != roots[i])
continue;
win = Find_Child_At_Pointer(dpy, subwin);
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if (win == XCB_WINDOW_NONE) {
free (roots);
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return subwin; /* No child - Return virtual root. */
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}
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subwin = win;
break;
}
free (roots);
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if (atom_wm_state == XCB_ATOM_NONE) {
atom_wm_state = Get_Atom(dpy, "WM_STATE");
if (atom_wm_state == XCB_ATOM_NONE)
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return subwin;
}
/* Check if subwin has WM_STATE */
if (Window_Has_Property(dpy, subwin, atom_wm_state))
return subwin;
/* Attempt to find a client window in subwin's children */
win = Find_Client_In_Children(dpy, subwin);
if (win != XCB_WINDOW_NONE)
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return win; /* Found a client */
/* Did not find a client */
return subwin;
}