diff options
Diffstat (limited to 'apps/xwininfo/clientwin.c')
| -rw-r--r-- | apps/xwininfo/clientwin.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/apps/xwininfo/clientwin.c b/apps/xwininfo/clientwin.c new file mode 100644 index 000000000..cce35ad24 --- /dev/null +++ b/apps/xwininfo/clientwin.c @@ -0,0 +1,216 @@ +/* + * 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> + +#include "clientwin.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. + */ +static 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) + */ +static 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; +} |