1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/*
* 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 <X11/Xatom.h>
#include <X11/Xlib.h>
static Atom atom_wm_state = None;
/*
* Check if window has given property
*/
static Bool
Window_Has_Property(Display * dpy, Window win, Atom atom)
{
Atom type_ret;
int format_ret;
unsigned char *prop_ret;
unsigned long bytes_after, num_ret;
type_ret = None;
prop_ret = NULL;
XGetWindowProperty(dpy, win, atom, 0, 0, False, AnyPropertyType,
&type_ret, &format_ret, &num_ret,
&bytes_after, &prop_ret);
if (prop_ret)
XFree(prop_ret);
return (type_ret != None) ? True : False;
}
/*
* Check if window is viewable
*/
static Bool
Window_Is_Viewable(Display * dpy, Window win)
{
Bool ok;
XWindowAttributes xwa;
XGetWindowAttributes(dpy, win, &xwa);
ok = (xwa.class == InputOutput) && (xwa.map_state == IsViewable);
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.
*/
Window
Find_Client_In_Children(Display * dpy, Window win)
{
Window root, parent;
Window *children;
unsigned int n_children;
int i;
if (!XQueryTree(dpy, win, &root, &parent, &children, &n_children))
return None;
if (!children)
return None;
/* Check each child for WM_STATE and other validity */
win = None;
for (i = (int) n_children - 1; i >= 0; i--) {
if (!Window_Is_Viewable(dpy, children[i])) {
children[i] = None; /* Don't bother descending into this one */
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] == None)
continue;
win = Find_Client_In_Children(dpy, children[i]);
if (win != None)
break;
}
done:
XFree(children);
return win;
}
/*
* Find virtual roots (_NET_VIRTUAL_ROOTS)
*/
unsigned long *
Find_Roots(Display * dpy, Window root, unsigned int *num)
{
Atom type_ret;
int format_ret;
unsigned char *prop_ret;
unsigned long bytes_after, num_ret;
Atom atom;
*num = 0;
atom = XInternAtom(dpy, "_NET_VIRTUAL_ROOTS", False);
if (!atom)
return NULL;
type_ret = None;
prop_ret = NULL;
if (XGetWindowProperty(dpy, root, atom, 0, 0x7fffffff, False,
XA_WINDOW, &type_ret, &format_ret, &num_ret,
&bytes_after, &prop_ret) != Success)
return NULL;
if (prop_ret && type_ret == XA_WINDOW && format_ret == 32) {
*num = num_ret;
return ((unsigned long *) prop_ret);
}
if (prop_ret)
XFree(prop_ret);
return NULL;
}
/*
* Find child window at pointer location
*/
static Window
Find_Child_At_Pointer(Display * dpy, Window win)
{
Window root_return, child_return;
int dummyi;
unsigned int dummyu;
XQueryPointer(dpy, win, &root_return, &child_return,
&dummyi, &dummyi, &dummyi, &dummyi, &dummyu);
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.
*/
Window
Find_Client(Display * dpy, Window root, Window subwin)
{
unsigned long *roots;
unsigned int i, n_roots;
Window win;
/* 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);
if (win == None)
return subwin; /* No child - Return virtual root. */
subwin = win;
break;
}
if (roots)
XFree(roots);
if (atom_wm_state == None) {
atom_wm_state = XInternAtom(dpy, "WM_STATE", False);
if (!atom_wm_state)
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 != None)
return win; /* Found a client */
/* Did not find a client */
return subwin;
}
|
