all events are dispatched

[dana/openbox.git] / openbox / client.c

#include "client.h"
#include "screen.h"
#include "prop.h"
#include "extensions.h"
#include "frame.h"
#include "engine.h"
#include "event.h"
#include "focus.h"
#include "stacking.h"
#include "dispatch.h"

#include <glib.h>
#include <X11/Xutil.h>

/*! The event mask to grab on client windows */
#define CLIENT_EVENTMASK (PropertyChangeMask | FocusChangeMask | \
                          StructureNotifyMask)

#define CLIENT_NOPROPAGATEMASK (ButtonPressMask | ButtonReleaseMask | \
                                ButtonMotionMask)

GSList     *client_list      = NULL;
GHashTable *client_map       = NULL;

static void client_get_all(Client *self);
static void client_toggle_border(Client *self, gboolean show);
static void client_get_area(Client *self);
static void client_get_desktop(Client *self);
static void client_get_state(Client *self);
static void client_get_shaped(Client *self);
static void client_get_mwm_hints(Client *self);
static void client_get_gravity(Client *self);
static void client_showhide(Client *self);
static void client_change_allowed_actions(Client *self);
static void client_change_state(Client *self);
static Client *search_focus_tree(Client *node, Client *skip);
static void client_apply_startup_state(Client *self);
static Client *search_modal_tree(Client *node, Client *skip);

static guint map_hash(Window w) { return w; }
static gboolean map_key_comp(Window w1, Window w2) { return w1 == w2; }

void client_startup()
{
    client_map = g_hash_table_new((GHashFunc)map_hash,
                                  (GEqualFunc)map_key_comp);
    client_set_list();
}

void client_shutdown()
{
    g_hash_table_destroy(client_map);
}

void client_set_list()
{
    Window *windows, *win_it;
    GSList *it;
    guint size = g_slist_length(client_list);

    /* create an array of the window ids */
    if (size > 0) {
        windows = g_new(Window, size);
        win_it = windows;
        for (it = client_list; it != NULL; it = it->next, ++win_it)
            *win_it = ((Client*)it->data)->window;
    } else
        windows = NULL;

    PROP_SET32A(ob_root, net_client_list, window, windows, size);

    if (windows)
        g_free(windows);

    stacking_set_list();
}

void client_manage_all()
{
    unsigned int i, j, nchild;
    Window w, *children;
    XWMHints *wmhints;
    XWindowAttributes attrib;

    XQueryTree(ob_display, ob_root, &w, &w, &children, &nchild);

    /* remove all icon windows from the list */
    for (i = 0; i < nchild; i++) {
        if (children[i] == None) continue;
        wmhints = XGetWMHints(ob_display, children[i]);
        if (wmhints) {
            if ((wmhints->flags & IconWindowHint) &&
                (wmhints->icon_window != children[i]))
                for (j = 0; j < nchild; j++)
                    if (children[j] == wmhints->icon_window) {
                        children[j] = None;
                        break;
                    }
            XFree(wmhints);
        }
    }

    for (i = 0; i < nchild; ++i) {
        if (children[i] == None)
            continue;
        if (XGetWindowAttributes(ob_display, children[i], &attrib)) {
            if (attrib.override_redirect) continue;

            if (attrib.map_state != IsUnmapped)
                client_manage(children[i]);
        }
    }
    XFree(children);
}

void client_manage(Window window)
{
    Client *client;
    XEvent e;
    XWindowAttributes attrib;
    XSetWindowAttributes attrib_set;
/*    XWMHints *wmhint; */
     
    XGrabServer(ob_display);
    XSync(ob_display, FALSE);

    /* check if it has already been unmapped by the time we started mapping
       the grab does a sync so we don't have to here */
    if (XCheckTypedWindowEvent(ob_display, window, DestroyNotify, &e) ||
        XCheckTypedWindowEvent(ob_display, window, UnmapNotify, &e)) {
        XPutBackEvent(ob_display, &e);
    
        XUngrabServer(ob_display);
        XFlush(ob_display);
        return; /* don't manage it */
    }

    /* make sure it isn't an override-redirect window */
    if (!XGetWindowAttributes(ob_display, window, &attrib) ||
        attrib.override_redirect) {
        XUngrabServer(ob_display);
        XFlush(ob_display);
        return; /* don't manage it */
    }
  
/*    /\* is the window a docking app *\/
    if ((wmhint = XGetWMHints(ob_display, window))) {
        if ((wmhint->flags & StateHint) &&
            wmhint->initial_state == WithdrawnState) {
            /\* XXX: make dock apps work! *\/
            XUngrabServer(ob_display);
            XFlush(ob_display);
            XFree(wmhint);
            return;
        }
        XFree(wmhint);
    }
*/

    /* choose the events we want to receive on the CLIENT window */
    attrib_set.event_mask = CLIENT_EVENTMASK;
    attrib_set.do_not_propagate_mask = CLIENT_NOPROPAGATEMASK;
    XChangeWindowAttributes(ob_display, window,
                            CWEventMask|CWDontPropagate, &attrib_set);


    /* create the Client struct, and populate it from the hints on the
       window */
    client = g_new(Client, 1);
    client->window = window;
    client_get_all(client);

    /* remove the client's border (and adjust re gravity) */
    client_toggle_border(client, FALSE);
     
    /* specify that if we exit, the window should not be destroyed and should
       be reparented back to root automatically */
    XChangeSaveSet(ob_display, window, SetModeInsert);

    /* create the decoration frame for the client window */
    client->frame = engine_frame_new();

    engine_frame_grab_client(client->frame, client);

    client_apply_startup_state(client);

    XUngrabServer(ob_display);
    XFlush(ob_display);
     
    client_list = g_slist_append(client_list, client);
    stacking_list = g_list_append(stacking_list, client);
    g_hash_table_insert(client_map, (gpointer)window, client);

    stacking_raise(client);

    screen_update_struts();

    dispatch_client(Event_Client_New, client);

    client_showhide(client);

    dispatch_client(Event_Client_Mapped, client);

    /* grab all mouse bindings */
    /*pointer_grab_all(client, TRUE);XXX*/

    /* update the list hints */
    client_set_list();

    g_message("Managed window 0x%lx", window);
}

void client_unmanage_all()
{
    while (client_list != NULL)
        client_unmanage(client_list->data);
}

void client_unmanage(Client *client)
{
    int j;
    GSList *it;

    g_message("Unmanaging window: %lx", client->window);

    dispatch_client(Event_Client_Destroy, client);

    /* remove the window from our save set */
    XChangeSaveSet(ob_display, client->window, SetModeDelete);

    /* we dont want events no more */
    XSelectInput(ob_display, client->window, NoEventMask);

    /* ungrab any mouse bindings */
    /*pointer_grab_all(client, FALSE);XXX*/
     
    engine_frame_hide(client->frame);

    /* give the client its border back */
    client_toggle_border(client, TRUE);

    /* reparent the window out of the frame, and free the frame */
    engine_frame_release_client(client->frame, client);
     
    client_list = g_slist_remove(client_list, client);
    stacking_list = g_list_remove(stacking_list, client);
    g_hash_table_remove(client_map, (gpointer)client->window);

    /* once the client is out of the list, update the struts to remove it's
       influence */
    screen_update_struts();

    /* tell our parent that we're gone */
    if (client->transient_for != NULL)
        client->transient_for->transients =
            g_slist_remove(client->transient_for->transients, client);

    /* tell our transients that we're gone */
    for (it = client->transients; it != NULL; it = it->next) {
        ((Client*)it->data)->transient_for = NULL;
        client_calc_layer(it->data);
    }

    /* unfocus the client (calls the focus callbacks) (we're out of the
     transient lists already, so being modal doesn't matter) */
    if (client->focused)
        client_unfocus(client);
    
    if (ob_state != State_Exiting) {
        /* these values should not be persisted across a window
           unmapping/mapping */
        prop_erase(client->window, prop_atoms.net_wm_desktop);
        prop_erase(client->window, prop_atoms.net_wm_state);
    } else {
        /* if we're left in an iconic state, the client wont be mapped. this is
           bad, since we will no longer be managing the window on restart */
        if (client->iconic)
            XMapWindow(ob_display, client->window);
    }

    /* free all data allocated in the client struct */
    g_slist_free(client->transients);
    for (j = 0; j < client->nicons; ++j)
        g_free(client->icons[j].data);
    if (client->nicons > 0)
        g_free(client->icons);
    g_free(client->title);
    g_free(client->icon_title);
    g_free(client->res_name);
    g_free(client->res_class);
    g_free(client->role);
    g_free(client);
     
    /* update the list hints */
    client_set_list();
}

static void client_toggle_border(Client *self, gboolean show)
{
    /* adjust our idea of where the client is, based on its border. When the
       border is removed, the client should now be considered to be in a
       different position.
       when re-adding the border to the client, the same operation needs to be
       reversed. */
    int oldx = self->area.x, oldy = self->area.y;
    int x = oldx, y = oldy;
    switch(self->gravity) {
    default:
    case NorthWestGravity:
    case WestGravity:
    case SouthWestGravity:
        break;
    case NorthEastGravity:
    case EastGravity:
    case SouthEastGravity:
        if (show) x -= self->border_width * 2;
        else      x += self->border_width * 2;
        break;
    case NorthGravity:
    case SouthGravity:
    case CenterGravity:
    case ForgetGravity:
    case StaticGravity:
        if (show) x -= self->border_width;
        else      x += self->border_width;
        break;
    }
    switch(self->gravity) {
    default:
    case NorthWestGravity:
    case NorthGravity:
    case NorthEastGravity:
        break;
    case SouthWestGravity:
    case SouthGravity:
    case SouthEastGravity:
        if (show) y -= self->border_width * 2;
        else      y += self->border_width * 2;
        break;
    case WestGravity:
    case EastGravity:
    case CenterGravity:
    case ForgetGravity:
    case StaticGravity:
        if (show) y -= self->border_width;
        else      y += self->border_width;
        break;
    }
    self->area.x = x;
    self->area.y = y;

    if (show) {
        XSetWindowBorderWidth(ob_display, self->window, self->border_width);

        /* move the client so it is back it the right spot _with_ its
           border! */
        if (x != oldx || y != oldy)
            XMoveWindow(ob_display, self->window, x, y);
    } else
        XSetWindowBorderWidth(ob_display, self->window, 0);
}


static void client_get_all(Client *self)
{
    /* update EVERYTHING!! */

    self->ignore_unmaps = 0;
  
    /* defaults */
    self->frame = NULL;
    self->title = self->icon_title = NULL;
    self->res_name = self->res_class = self->role = NULL;
    self->wmstate = NormalState;
    self->focused = FALSE;
    self->transient = FALSE;
    self->transients = NULL;
    self->transient_for = NULL;
    self->layer = -1;
    self->urgent = FALSE;
    self->positioned = FALSE;
    self->disabled_decorations = 0;
    self->group = None;
    self->nicons = 0;

    client_get_area(self);
    client_get_desktop(self);
    client_get_state(self);
    client_get_shaped(self);

    client_update_transient_for(self);
    client_get_mwm_hints(self);
    client_get_type(self);/* this can change the mwmhints for special cases */

    client_update_protocols(self);

    client_get_gravity(self); /* get the attribute gravity */
    client_update_normal_hints(self); /* this may override the attribute
                                         gravity */

    /* got the type, the mwmhints, the protocols, and the normal hints
       (min/max sizes), so we're ready to set up the decorations/functions */
    client_setup_decor_and_functions(self);
  
    client_update_wmhints(self);
    client_update_title(self);
    client_update_icon_title(self);
    client_update_class(self);
    client_update_strut(self);
    client_update_icons(self);
    client_update_kwm_icon(self);

    /* this makes sure that these windows appear on all desktops */
    if (self->type == Type_Desktop)
        self->desktop = DESKTOP_ALL;

    /* set the desktop hint, to make sure that it always exists, and to
       reflect any changes we've made here */
    PROP_SET32(self->window, net_wm_desktop, cardinal, self->desktop);

    client_change_state(self);
}

static void client_get_area(Client *self)
{
    XWindowAttributes wattrib;
    Status ret;
  
    ret = XGetWindowAttributes(ob_display, self->window, &wattrib);
    g_assert(ret != BadWindow);

    RECT_SET(self->area, wattrib.x, wattrib.y, wattrib.width, wattrib.height);
    self->border_width = wattrib.border_width;
}

static void client_get_desktop(Client *self)
{
    unsigned int d;

    if (PROP_GET32(self->window, net_wm_desktop, cardinal, d)) {
        if (d >= screen_num_desktops && d != DESKTOP_ALL)
            d = screen_num_desktops - 1;
        self->desktop = d;
    } else {
        /* defaults to the current desktop */
        self->desktop = screen_desktop;
    }
}

static void client_get_state(Client *self)
{
    gulong *state;
    gulong num;
  
    self->modal = self->shaded = self->max_horz = self->max_vert =
        self->fullscreen = self->above = self->below = self->iconic =
        self->skip_taskbar = self->skip_pager = FALSE;

    if (PROP_GET32U(self->window, net_wm_state, atom, state, num)) {
        gulong i;
        for (i = 0; i < num; ++i) {
            if (state[i] == prop_atoms.net_wm_state_modal)
                self->modal = TRUE;
            else if (state[i] == prop_atoms.net_wm_state_shaded)
                self->shaded = TRUE;
            else if (state[i] == prop_atoms.net_wm_state_hidden)
                self->iconic = TRUE;
            else if (state[i] == prop_atoms.net_wm_state_skip_taskbar)
                self->skip_taskbar = TRUE;
            else if (state[i] == prop_atoms.net_wm_state_skip_pager)
                self->skip_pager = TRUE;
            else if (state[i] == prop_atoms.net_wm_state_fullscreen)
                self->fullscreen = TRUE;
            else if (state[i] == prop_atoms.net_wm_state_maximized_vert)
                self->max_vert = TRUE;
            else if (state[i] == prop_atoms.net_wm_state_maximized_horz)
                self->max_horz = TRUE;
            else if (state[i] == prop_atoms.net_wm_state_above)
                self->above = TRUE;
            else if (state[i] == prop_atoms.net_wm_state_below)
                self->below = TRUE;
        }

        g_free(state);
    }
}

static void client_get_shaped(Client *self)
{
    self->shaped = FALSE;
#ifdef   SHAPE
    if (extensions_shape) {
        int foo;
        guint ufoo;
        int s;

        XShapeSelectInput(ob_display, self->window, ShapeNotifyMask);

        XShapeQueryExtents(ob_display, self->window, &s, &foo,
                           &foo, &ufoo, &ufoo, &foo, &foo, &foo, &ufoo,
                           &ufoo);
        self->shaped = (s != 0);
    }
#endif
}

void client_update_transient_for(Client *self)
{
    Window t = None;
    Client *c = NULL;

    if (XGetTransientForHint(ob_display, self->window, &t) &&
        t != self->window) { /* cant be transient to itself! */
        self->transient = TRUE;
        c = g_hash_table_lookup(client_map, (gpointer)t);
        g_assert(c != self);/* if this happens then we need to check for it*/

        if (!c /*XXX: && _group*/) {
            /* not transient to a client, see if it is transient for a
               group */
            if (/*t == _group->leader() || */
                t == None ||
                t == ob_root) {
                /* window is a transient for its group! */
                /* XXX: for now this is treated as non-transient.
                   this needs to be fixed! */
            }
        }
    } else
        self->transient = FALSE;

    /* if anything has changed... */
    if (c != self->transient_for) {
        if (self->transient_for)
            /* remove from old parent */
            g_slist_remove(self->transient_for->transients, self);
        self->transient_for = c;
        if (self->transient_for)
            /* add to new parent */
            g_slist_append(self->transient_for->transients, self);
    }
}

static void client_get_mwm_hints(Client *self)
{
    unsigned long num;
    unsigned long *hints;

    self->mwmhints.flags = 0; /* default to none */

    if (PROP_GET32U(self->window, motif_wm_hints, motif_wm_hints, hints, num)) {
        if (num >= MWM_ELEMENTS) {
            self->mwmhints.flags = hints[0];
            self->mwmhints.functions = hints[1];
            self->mwmhints.decorations = hints[2];
        }
        g_free(hints);
    }
}

void client_get_type(Client *self)
{
    gulong *val, num, i;

    self->type = -1;
  
    if (PROP_GET32U(self->window, net_wm_window_type, atom, val, num)) {
        /* use the first value that we know about in the array */
        for (i = 0; i < num; ++i) {
            if (val[i] == prop_atoms.net_wm_window_type_desktop)
                self->type = Type_Desktop;
            else if (val[i] == prop_atoms.net_wm_window_type_dock)
                self->type = Type_Dock;
            else if (val[i] == prop_atoms.net_wm_window_type_toolbar)
                self->type = Type_Toolbar;
            else if (val[i] == prop_atoms.net_wm_window_type_menu)
                self->type = Type_Menu;
            else if (val[i] == prop_atoms.net_wm_window_type_utility)
                self->type = Type_Utility;
            else if (val[i] == prop_atoms.net_wm_window_type_splash)
                self->type = Type_Splash;
            else if (val[i] == prop_atoms.net_wm_window_type_dialog)
                self->type = Type_Dialog;
            else if (val[i] == prop_atoms.net_wm_window_type_normal)
                self->type = Type_Normal;
            else if (val[i] == prop_atoms.kde_net_wm_window_type_override) {
                /* prevent this window from getting any decor or
                   functionality */
                self->mwmhints.flags &= (MwmFlag_Functions |
                                         MwmFlag_Decorations);
                self->mwmhints.decorations = 0;
                self->mwmhints.functions = 0;
            }
            if (self->type != (WindowType) -1)
                break; /* grab the first legit type */
        }
        g_free(val);
    }
    
    if (self->type == (WindowType) -1) {
        /*the window type hint was not set, which means we either classify
          ourself as a normal window or a dialog, depending on if we are a
          transient. */
        if (self->transient)
            self->type = Type_Dialog;
        else
            self->type = Type_Normal;
    }
}

void client_update_protocols(Client *self)
{
    Atom *proto;
    gulong num_return, i;

    self->focus_notify = FALSE;
    self->delete_window = FALSE;

    if (PROP_GET32U(self->window, wm_protocols, atom, proto, num_return)) {
        for (i = 0; i < num_return; ++i) {
            if (proto[i] == prop_atoms.wm_delete_window) {
                /* this means we can request the window to close */
                self->delete_window = TRUE;
            } else if (proto[i] == prop_atoms.wm_take_focus)
                /* if this protocol is requested, then the window will be
                   notified whenever we want it to receive focus */
                self->focus_notify = TRUE;
        }
        g_free(proto);
    }
}

static void client_get_gravity(Client *self)
{
    XWindowAttributes wattrib;
    Status ret;

    ret = XGetWindowAttributes(ob_display, self->window, &wattrib);
    g_assert(ret != BadWindow);
    self->gravity = wattrib.win_gravity;
}

void client_update_normal_hints(Client *self)
{
    XSizeHints size;
    long ret;
    int oldgravity = self->gravity;

    /* defaults */
    self->min_ratio = 0.0f;
    self->max_ratio = 0.0f;
    SIZE_SET(self->size_inc, 1, 1);
    SIZE_SET(self->base_size, 0, 0);
    SIZE_SET(self->min_size, 0, 0);
    SIZE_SET(self->max_size, G_MAXINT, G_MAXINT);

    /* get the hints from the window */
    if (XGetWMNormalHints(ob_display, self->window, &size, &ret)) {
        self->positioned = (size.flags & (PPosition|USPosition));

        if (size.flags & PWinGravity) {
            self->gravity = size.win_gravity;
      
            /* if the client has a frame, i.e. has already been mapped and
               is changing its gravity */
            if (self->frame && self->gravity != oldgravity) {
                /* move our idea of the client's position based on its new
                   gravity */
                self->area.x = self->frame->area.x;
                self->area.y = self->frame->area.y;
                frame_frame_gravity(self->frame, &self->area.x, &self->area.y);
            }
        }

        if (size.flags & PAspect) {
            if (size.min_aspect.y)
                self->min_ratio = (float)size.min_aspect.x / size.min_aspect.y;
            if (size.max_aspect.y)
                self->max_ratio = (float)size.max_aspect.x / size.max_aspect.y;
        }

        if (size.flags & PMinSize)
            SIZE_SET(self->min_size, size.min_width, size.min_height);
    
        if (size.flags & PMaxSize)
            SIZE_SET(self->max_size, size.max_width, size.max_height);
    
        if (size.flags & PBaseSize)
            SIZE_SET(self->base_size, size.base_width, size.base_height);
    
        if (size.flags & PResizeInc)
            SIZE_SET(self->size_inc, size.width_inc, size.height_inc);
    }
}

void client_setup_decor_and_functions(Client *self)
{
    /* start with everything (cept fullscreen) */
    self->decorations = Decor_Titlebar | Decor_Handle | Decor_Border |
        Decor_Icon | Decor_AllDesktops | Decor_Iconify | Decor_Maximize;
    self->functions = Func_Resize | Func_Move | Func_Iconify | Func_Maximize |
        Func_Shade;
    if (self->delete_window) {
        self->decorations |= Decor_Close;
        self->functions |= Func_Close;
    }

    if (!(self->min_size.width < self->max_size.width ||
          self->min_size.height < self->max_size.height)) {
        self->decorations &= ~(Decor_Maximize | Decor_Handle);
        self->functions &= ~(Func_Resize | Func_Maximize);
    }

    switch (self->type) {
    case Type_Normal:
        /* normal windows retain all of the possible decorations and
           functionality, and are the only windows that you can fullscreen */
        self->functions |= Func_Fullscreen;
        break;

    case Type_Dialog:
        /* dialogs cannot be maximized */
        self->decorations &= ~Decor_Maximize;
        self->functions &= ~Func_Maximize;
        break;

    case Type_Menu:
    case Type_Toolbar:
    case Type_Utility:
        /* these windows get less functionality */
        self->decorations &= ~(Decor_Iconify | Decor_Handle);
        self->functions &= ~(Func_Iconify | Func_Resize);
        break;

    case Type_Desktop:
    case Type_Dock:
    case Type_Splash:
        /* none of these windows are manipulated by the window manager */
        self->decorations = 0;
        self->functions = 0;
        break;
    }

    /* Mwm Hints are applied subtractively to what has already been chosen for
       decor and functionality */
    if (self->mwmhints.flags & MwmFlag_Decorations) {
        if (! (self->mwmhints.decorations & MwmDecor_All)) {
            if (! (self->mwmhints.decorations & MwmDecor_Border))
                self->decorations &= ~Decor_Border;
            if (! (self->mwmhints.decorations & MwmDecor_Handle))
                self->decorations &= ~Decor_Handle;
            if (! (self->mwmhints.decorations & MwmDecor_Title))
                self->decorations &= ~Decor_Titlebar;
            if (! (self->mwmhints.decorations & MwmDecor_Iconify))
                self->decorations &= ~Decor_Iconify;
            if (! (self->mwmhints.decorations & MwmDecor_Maximize))
                self->decorations &= ~Decor_Maximize;
        }
    }

    if (self->mwmhints.flags & MwmFlag_Functions) {
        if (! (self->mwmhints.functions & MwmFunc_All)) {
            if (! (self->mwmhints.functions & MwmFunc_Resize))
                self->functions &= ~Func_Resize;
            if (! (self->mwmhints.functions & MwmFunc_Move))
                self->functions &= ~Func_Move;
            if (! (self->mwmhints.functions & MwmFunc_Iconify))
                self->functions &= ~Func_Iconify;
            if (! (self->mwmhints.functions & MwmFunc_Maximize))
                self->functions &= ~Func_Maximize;
            /* dont let mwm hints kill the close button
               if (! (self->mwmhints.functions & MwmFunc_Close))
               self->functions &= ~Func_Close; */
        }
    }

    /* can't maximize without moving/resizing */
    if (!((self->functions & Func_Move) && (self->functions & Func_Resize)))
        self->functions &= ~Func_Maximize;

    /* finally, user specified disabled decorations are applied to subtract
       decorations */
    if (self->disabled_decorations & Decor_Titlebar)
        self->decorations &= ~Decor_Titlebar;
    if (self->disabled_decorations & Decor_Handle)
        self->decorations &= ~Decor_Handle;
    if (self->disabled_decorations & Decor_Border)
        self->decorations &= ~Decor_Border;
    if (self->disabled_decorations & Decor_Iconify)
        self->decorations &= ~Decor_Iconify;
    if (self->disabled_decorations & Decor_Maximize)
        self->decorations &= ~Decor_Maximize;
    if (self->disabled_decorations & Decor_AllDesktops)
        self->decorations &= ~Decor_AllDesktops;
    if (self->disabled_decorations & Decor_Close)
        self->decorations &= ~Decor_Close;

    /* if we don't have a titlebar, then we cannot shade! */
    if (!(self->decorations & Decor_Titlebar))
        self->functions &= ~Func_Shade;

    client_change_allowed_actions(self);

    if (self->frame) {
        /* change the decors on the frame */
        engine_frame_adjust_size(self->frame);
        /* with more/less decorations, we may need to be repositioned */
        engine_frame_adjust_position(self->frame);
        /* with new decor, the window's maximized size may change */
        client_remaximize(self);
    }
}

static void client_change_allowed_actions(Client *self)
{
    Atom actions[9];
    int num = 0;

    actions[num++] = prop_atoms.net_wm_action_change_desktop;

    if (self->functions & Func_Shade)
        actions[num++] = prop_atoms.net_wm_action_shade;
    if (self->functions & Func_Close)
        actions[num++] = prop_atoms.net_wm_action_close;
    if (self->functions & Func_Move)
        actions[num++] = prop_atoms.net_wm_action_move;
    if (self->functions & Func_Iconify)
        actions[num++] = prop_atoms.net_wm_action_minimize;
    if (self->functions & Func_Resize)
        actions[num++] = prop_atoms.net_wm_action_resize;
    if (self->functions & Func_Fullscreen)
        actions[num++] = prop_atoms.net_wm_action_fullscreen;
    if (self->functions & Func_Maximize) {
        actions[num++] = prop_atoms.net_wm_action_maximize_horz;
        actions[num++] = prop_atoms.net_wm_action_maximize_vert;
    }

    PROP_SET32A(self->window, net_wm_allowed_actions, atom, actions, num);

    /* make sure the window isn't breaking any rules now */

    if (!(self->functions & Func_Shade) && self->shaded) {
        if (self->frame) client_shade(self, FALSE);
        else self->shaded = FALSE;
    }
    if (!(self->functions & Func_Iconify) && self->iconic) {
        if (self->frame) client_iconify(self, FALSE, TRUE);
        else self->iconic = FALSE;
    }
    if (!(self->functions & Func_Fullscreen) && self->fullscreen) {
        if (self->frame) client_fullscreen(self, FALSE, TRUE);
        else self->fullscreen = FALSE;
    }
    if (!(self->functions & Func_Maximize) && (self->max_horz ||
                                               self->max_vert)) {
        if (self->frame) client_maximize(self, FALSE, 0, TRUE);
        else self->max_vert = self->max_horz = FALSE;
    }
}

void client_remaximize(Client *self)
{
    int dir;
    if (self->max_horz && self->max_vert)
        dir = 0;
    else if (self->max_horz)
        dir = 1;
    else if (self->max_vert)
        dir = 2;
    else
        return; /* not maximized */
    self->max_horz = self->max_vert = FALSE;
    client_maximize(self, TRUE, dir, FALSE);
}

void client_update_wmhints(Client *self)
{
    XWMHints *hints;
    gboolean ur = FALSE;

    /* assume a window takes input if it doesnt specify */
    self->can_focus = TRUE;
  
    if ((hints = XGetWMHints(ob_display, self->window)) != NULL) {
        if (hints->flags & InputHint)
            self->can_focus = hints->input;

        /* only do this when starting! */
        if (ob_state == State_Starting && (hints->flags & StateHint))
            self->iconic = hints->initial_state == IconicState;

        if (hints->flags & XUrgencyHint)
            ur = TRUE;

        if (hints->flags & WindowGroupHint) {
            if (hints->window_group != self->group) {
                /* XXX: remove from the old group if there was one */
                self->group = hints->window_group;
                /* XXX: do stuff with the group */
            }
        } else /* no group! */
            self->group = None;

        if (hints->flags & IconPixmapHint) {
            client_update_kwm_icon(self);
            /* try get the kwm icon first, this is a fallback only */
            if (self->pixmap_icon == None) {
                self->pixmap_icon = hints->icon_pixmap;
                if (hints->flags & IconMaskHint)
                    self->pixmap_icon_mask = hints->icon_mask;
                else
                    self->pixmap_icon_mask = None;

                if (self->frame)
                    engine_frame_adjust_icon(self->frame);
            }
        }

        XFree(hints);
    }

    if (ur != self->urgent) {
        self->urgent = ur;
        g_message("Urgent Hint for 0x%lx: %s\n", self->window,
                  ur ? "ON" : "OFF");
        /* fire the urgent callback if we're mapped, otherwise, wait until
           after we're mapped */
        if (self->frame)
            dispatch_client(Event_Client_Urgent, self);
    }
}

void client_update_title(Client *self)
{
    gchar *data = NULL;

    if (self->title != NULL)
        g_free(self->title);
     
    /* try netwm */
    if (!PROP_GETS(self->window, net_wm_name, utf8, data)) {
        /* try old x stuff */
        if (PROP_GETS(self->window, wm_name, string, data)) {
            /* convert it to UTF-8 */
            gsize r, w;
            gchar *u;

            u = g_locale_to_utf8(data, -1, &r, &w, NULL);
            if (u == NULL) {
                g_warning("Unable to convert string to UTF-8");
            } else {
                g_free(data);
                data = u;
            }
        }
        if (data == NULL)
            data = g_strdup("Unnamed Window");

        PROP_SETS(self->window, net_wm_visible_name, utf8, data);
    }

    self->title = data;

    if (self->frame)
        engine_frame_adjust_title(self->frame);
}

void client_update_icon_title(Client *self)
{
    gchar *data = NULL;

    if (self->icon_title != NULL)
        g_free(self->icon_title);
     
    /* try netwm */
    if (!PROP_GETS(self->window, net_wm_icon_name, utf8, data)) {
        /* try old x stuff */
        if (PROP_GETS(self->window, wm_icon_name, string, data)) {
            /* convert it to UTF-8 */
            gsize r, w;
            gchar *u;

            u = g_locale_to_utf8(data, -1, &r, &w, NULL);
            if (u == NULL) {
                g_warning("Unable to convert string to UTF-8");
            } else {
                g_free(data);
                data = u;
            }
        }
        if (data == NULL)
            data = g_strdup("Unnamed Window");

        PROP_SETS(self->window, net_wm_visible_icon_name, utf8, data);
    }

    self->icon_title = data;
}

void client_update_class(Client *self)
{
    GPtrArray *data;
    gchar *s;
    guint i;

    if (self->res_name) g_free(self->res_name);
    if (self->res_class) g_free(self->res_class);
    if (self->role) g_free(self->role);

    self->res_name = self->res_class = self->role = NULL;

    data = g_ptr_array_new();
     
    if (PROP_GETSA(self->window, wm_class, string, data)) {
        if (data->len > 0)
            self->res_name = g_strdup(g_ptr_array_index(data, 0));
        if (data->len > 1)
            self->res_class = g_strdup(g_ptr_array_index(data, 1));
    }
     
    for (i = 0; i < data->len; ++i)
        g_free(g_ptr_array_index(data, i));
    g_ptr_array_free(data, TRUE);

    if (PROP_GETS(self->window, wm_window_role, string, s))
        self->role = g_strdup(s);

    if (self->res_name == NULL) self->res_name = g_strdup("");
    if (self->res_class == NULL) self->res_class = g_strdup("");
    if (self->role == NULL) self->role = g_strdup("");
}

void client_update_strut(Client *self)
{
    gulong *data;

    if (PROP_GET32A(self->window, net_wm_strut, cardinal, data, 4)) {
        STRUT_SET(self->strut, data[0], data[1], data[2], data[3]);
        g_free(data);
    } else
        STRUT_SET(self->strut, 0, 0, 0, 0);

    /* updating here is pointless while we're being mapped cuz we're not in
       the client list yet */
    if (self->frame)
        screen_update_struts();
}

void client_update_icons(Client *self)
{
    unsigned long num;
    unsigned long *data;
    unsigned long w, h, i;
    int j;

    for (j = 0; j < self->nicons; ++j)
        g_free(self->icons[j].data);
    if (self->nicons > 0)
        g_free(self->icons);
    self->nicons = 0;

    if (PROP_GET32U(self->window, net_wm_icon, cardinal, data, num)) {
        /* figure out how many valid icons are in here */
        i = 0;
        while (num - i > 2) {
            w = data[i++];
            h = data[i++];
            i += w * h;
            if (i > num) break;
            ++self->nicons;
        }

        self->icons = g_new(Icon, self->nicons);
    
        /* store the icons */
        i = 0;
        for (j = 0; j < self->nicons; ++j) {
            w = self->icons[j].w = data[i++];
            h = self->icons[j].h = data[i++];
            self->icons[j].data =
                g_memdup(&data[i], w * h * sizeof(gulong));
            i += w * h;
            g_assert(i <= num);
        }

        g_free(data);
    }

    if (self->nicons <= 0) {
        self->nicons = 1;
        self->icons = g_new0(Icon, 1);
    }

    if (self->frame)
        engine_frame_adjust_icon(self->frame);
}

void client_update_kwm_icon(Client *self)
{
    Pixmap *data;

    if (PROP_GET32A(self->window, kwm_win_icon, kwm_win_icon, data, 2)) {
        self->pixmap_icon = data[0];
        self->pixmap_icon_mask = data[1];
        g_free(data);
    } else {
        self->pixmap_icon = self->pixmap_icon_mask = None;
    }
    if (self->frame)
        engine_frame_adjust_icon(self->frame);
}

static void client_change_state(Client *self)
{
    unsigned long state[2];
    Atom netstate[10];
    int num;

    state[0] = self->wmstate;
    state[1] = None;
    PROP_SET32A(self->window, wm_state, wm_state, state, 2);

    num = 0;
    if (self->modal)
        netstate[num++] = prop_atoms.net_wm_state_modal;
    if (self->shaded)
        netstate[num++] = prop_atoms.net_wm_state_shaded;
    if (self->iconic)
        netstate[num++] = prop_atoms.net_wm_state_hidden;
    if (self->skip_taskbar)
        netstate[num++] = prop_atoms.net_wm_state_skip_taskbar;
    if (self->skip_pager)
        netstate[num++] = prop_atoms.net_wm_state_skip_pager;
    if (self->fullscreen)
        netstate[num++] = prop_atoms.net_wm_state_fullscreen;
    if (self->max_vert)
        netstate[num++] = prop_atoms.net_wm_state_maximized_vert;
    if (self->max_horz)
        netstate[num++] = prop_atoms.net_wm_state_maximized_horz;
    if (self->above)
        netstate[num++] = prop_atoms.net_wm_state_above;
    if (self->below)
        netstate[num++] = prop_atoms.net_wm_state_below;
    PROP_SET32A(self->window, net_wm_state, atom, netstate, num);

    client_calc_layer(self);

    if (self->frame)
        engine_frame_adjust_state(self->frame);
}

static Client *search_focus_tree(Client *node, Client *skip)
{
    GSList *it;
    Client *ret;

    for (it = node->transients; it != NULL; it = g_slist_next(it)) {
        Client *c = it->data;
        if (c == skip) continue; /* circular? */
        if ((ret = search_focus_tree(c, skip))) return ret;
        if (c->focused) return c;
    }
    return NULL;
}

void client_calc_layer(Client *self)
{
    StackLayer l;
    gboolean fs;
    Client *c;

    /* are we fullscreen, or do we have a fullscreen transient parent? */
    c = self;
    fs = FALSE;
    while (c) {
        if (c->fullscreen) {
            fs = TRUE;
            break;
        }
        c = c->transient_for;
    }
    if (!fs && self->fullscreen) {
        /* is one of our transients focused? */
        c = search_focus_tree(self, self);
        if (c != NULL) fs = TRUE;
    }
  
    if (self->iconic) l = Layer_Icon;
    else if (fs) l = Layer_Fullscreen;
    else if (self->type == Type_Desktop) l = Layer_Desktop;
    else if (self->type == Type_Dock) {
        if (!self->below) l = Layer_Top;
        else l = Layer_Normal;
    }
    else if (self->above) l = Layer_Above;
    else if (self->below) l = Layer_Below;
    else l = Layer_Normal;
     
    if (l != self->layer) {
        self->layer = l;
        if (self->frame)
            stacking_raise(self);
    }
}

gboolean client_should_show(Client *self)
{
    if (self->iconic) return FALSE;
    else if (!(self->desktop == screen_desktop ||
               self->desktop == DESKTOP_ALL)) return FALSE;
    else if (client_normal(self) && screen_showing_desktop) return FALSE;
    
    return TRUE;
}

static void client_showhide(Client *self)
{

    if (client_should_show(self))
        engine_frame_show(self->frame);
    else
        engine_frame_hide(self->frame);

    dispatch_client(Event_Client_Visible, self);
}

gboolean client_normal(Client *self) {
    return ! (self->type == Type_Desktop || self->type == Type_Dock ||
              self->type == Type_Splash);
}

static void client_apply_startup_state(Client *self)
{
    /* these are in a carefully crafted order.. */

    if (self->iconic) {
        self->iconic = FALSE;
        client_iconify(self, TRUE, FALSE);
    }
    if (self->fullscreen) {
        self->fullscreen = FALSE;
        client_fullscreen(self, TRUE, FALSE);
    }
    if (self->shaded) {
        self->shaded = FALSE;
        client_shade(self, TRUE);
    }
    if (self->urgent)
        dispatch_client(Event_Client_Urgent, self);
  
    if (self->max_vert && self->max_horz) {
        self->max_vert = self->max_horz = FALSE;
        client_maximize(self, TRUE, 0, FALSE);
    } else if (self->max_vert) {
        self->max_vert = FALSE;
        client_maximize(self, TRUE, 2, FALSE);
    } else if (self->max_horz) {
        self->max_horz = FALSE;
        client_maximize(self, TRUE, 1, FALSE);
    }

    /* nothing to do for the other states:
       skip_taskbar
       skip_pager
       modal
       above
       below
    */
}

void client_configure(Client *self, Corner anchor, int x, int y, int w, int h,
                      gboolean user, gboolean final)
{
    gboolean moved = FALSE, resized = FALSE;

    w -= self->base_size.width;
    h -= self->base_size.height;

    if (user) {
        /* for interactive resizing. have to move half an increment in each
           direction. */

        /* how far we are towards the next size inc */
        int mw = w % self->size_inc.width; 
        int mh = h % self->size_inc.height;
        /* amount to add */
        int aw = self->size_inc.width / 2;
        int ah = self->size_inc.height / 2;
        /* don't let us move into a new size increment */
        if (mw + aw >= self->size_inc.width)
            aw = self->size_inc.width - mw - 1;
        if (mh + ah >= self->size_inc.height)
            ah = self->size_inc.height - mh - 1;
        w += aw;
        h += ah;
    
        /* if this is a user-requested resize, then check against min/max
           sizes and aspect ratios */

        /* smaller than min size or bigger than max size? */
        if (w > self->max_size.width) w = self->max_size.width;
        if (w < self->min_size.width) w = self->min_size.width;
        if (h > self->max_size.height) h = self->max_size.height;
        if (h < self->min_size.height) h = self->min_size.height;

        /* adjust the height ot match the width for the aspect ratios */
        if (self->min_ratio)
            if (h * self->min_ratio > w) h = (int)(w / self->min_ratio);
        if (self->max_ratio)
            if (h * self->max_ratio < w) h = (int)(w / self->max_ratio);
    }

    /* keep to the increments */
    w /= self->size_inc.width;
    h /= self->size_inc.height;

    /* you cannot resize to nothing */
    if (w < 1) w = 1;
    if (h < 1) h = 1;
  
    /* store the logical size */
    SIZE_SET(self->logical_size, w, h);

    w *= self->size_inc.width;
    h *= self->size_inc.height;

    w += self->base_size.width;
    h += self->base_size.height;

    switch (anchor) {
    case Corner_TopLeft:
        break;
    case Corner_TopRight:
        x -= w - self->area.width;
        break;
    case Corner_BottomLeft:
        y -= h - self->area.height;
        break;
    case Corner_BottomRight:
        x -= w - self->area.width;
        y -= h - self->area.height;
        break;
    }

    moved = x != self->area.x || y != self->area.y;
    resized = w != self->area.width || h != self->area.height;

    RECT_SET(self->area, x, y, w, h);

    if (resized)
        XResizeWindow(ob_display, self->window, w, h);

    /* move/resize the frame to match the request */
    if (self->frame) {
        /* Adjust the size and then the position, as required by the EWMH */
        if (resized)
            engine_frame_adjust_size(self->frame);
        if (moved) {
            engine_frame_adjust_position(self->frame);

            if (!user || final) {
                XEvent event;
                event.type = ConfigureNotify;
                event.xconfigure.display = ob_display;
                event.xconfigure.event = self->window;
                event.xconfigure.window = self->window;
    
                /* root window coords with border in mind */
                event.xconfigure.x = x - self->border_width +
                    self->frame->size.left;
                event.xconfigure.y = y - self->border_width +
                    self->frame->size.top;
    
                event.xconfigure.width = self->area.width;
                event.xconfigure.height = self->area.height;
                event.xconfigure.border_width = self->border_width;
                event.xconfigure.above = self->frame->plate;
                event.xconfigure.override_redirect = FALSE;
                XSendEvent(event.xconfigure.display, event.xconfigure.window,
                           FALSE, StructureNotifyMask, &event);
            }
        }
    }
}

void client_fullscreen(Client *self, gboolean fs, gboolean savearea)
{
    static int saved_func, saved_decor;
    int x, y, w, h;

    if (!(self->functions & Func_Fullscreen) || /* can't */
        self->fullscreen == fs) return;         /* already done */

    self->fullscreen = fs;
    client_change_state(self); /* change the state hints on the client */

    if (fs) {
        /* save the functions and remove them */
        saved_func = self->functions;
        self->functions &= (Func_Close | Func_Fullscreen |
                            Func_Iconify);
        /* save the decorations and remove them */
        saved_decor = self->decorations;
        self->decorations = 0;
        if (savearea) {
            long dimensions[4];
            dimensions[0] = self->area.x;
            dimensions[1] = self->area.y;
            dimensions[2] = self->area.width;
            dimensions[3] = self->area.height;
  
            PROP_SET32A(self->window, openbox_premax, cardinal,
                        dimensions, 4);
        }
        x = 0;
        y = 0;
        w = screen_physical_size.width;
        h = screen_physical_size.height;
    } else {
        long *dimensions;

        self->functions = saved_func;
        self->decorations = saved_decor;
          
        if (PROP_GET32A(self->window, openbox_premax, cardinal,
                        dimensions, 4)) {
            x = dimensions[0];
            y = dimensions[1];
            w = dimensions[2];
            h = dimensions[3];
            g_free(dimensions);
        } else {
            /* pick some fallbacks... */
            x = screen_area(self->desktop)->x +
                screen_area(self->desktop)->width / 4;
            y = screen_area(self->desktop)->y +
                screen_area(self->desktop)->height / 4;
            w = screen_area(self->desktop)->width / 2;
            h = screen_area(self->desktop)->height / 2;
        }
    }

    client_change_allowed_actions(self); /* based on the new _functions */

    /* when fullscreening, don't obey things like increments, fill the
       screen */
    client_configure(self, Corner_TopLeft, x, y, w, h, !fs, TRUE);

    /* raise (back) into our stacking layer */
    stacking_raise(self);

    /* try focus us when we go into fullscreen mode */
    client_focus(self);
}

void client_iconify(Client *self, gboolean iconic, gboolean curdesk)
{
    if (self->iconic == iconic) return; /* nothing to do */

    g_message("%sconifying window: 0x%lx\n", (iconic ? "I" : "Uni"),
              self->window);

    self->iconic = iconic;

    if (iconic) {
        self->wmstate = IconicState;
        self->ignore_unmaps++;
        /* we unmap the client itself so that we can get MapRequest events,
           and because the ICCCM tells us to! */
        XUnmapWindow(ob_display, self->window);
    } else {
        if (curdesk)
            client_set_desktop(self, screen_desktop);
        self->wmstate = self->shaded ? IconicState : NormalState;
        XMapWindow(ob_display, self->window);
    }
    client_change_state(self);
    client_showhide(self);
    screen_update_struts();
}

void client_maximize(Client *self, gboolean max, int dir, gboolean savearea)
{
    int x, y, w, h;
     
    g_assert(dir == 0 || dir == 1 || dir == 2);
    if (!(self->functions & Func_Maximize)) return; /* can't */

    /* check if already done */
    if (max) {
        if (dir == 0 && self->max_horz && self->max_vert) return;
        if (dir == 1 && self->max_horz) return;
        if (dir == 2 && self->max_vert) return;
    } else {
        if (dir == 0 && !self->max_horz && !self->max_vert) return;
        if (dir == 1 && !self->max_horz) return;
        if (dir == 2 && !self->max_vert) return;
    }

    /* work with the frame's coords */
    x = self->frame->area.x;
    y = self->frame->area.y;
    w = self->area.width;
    h = self->area.height;

    if (max) {
        if (savearea) {
            long dimensions[4];
            long *readdim;

            dimensions[0] = x;
            dimensions[1] = y;
            dimensions[2] = w;
            dimensions[3] = h;

            /* get the property off the window and use it for the dimensions
               we are already maxed on */
            if (PROP_GET32A(self->window, openbox_premax, cardinal,
                            readdim, 4)) {
                if (self->max_horz) {
                    dimensions[0] = readdim[0];
                    dimensions[2] = readdim[2];
                }
                if (self->max_vert) {
                    dimensions[1] = readdim[1];
                    dimensions[3] = readdim[3];
                }
                g_free(readdim);
            }

            PROP_SET32A(self->window, openbox_premax, cardinal,
                        dimensions, 4);
        }
        if (dir == 0 || dir == 1) { /* horz */
            x = screen_area(self->desktop)->x - self->frame->size.left;
            w = screen_area(self->desktop)->x +
                screen_area(self->desktop)->width;
        }
        if (dir == 0 || dir == 2) { /* vert */
            y = screen_area(self->desktop)->y;
            h = screen_area(self->desktop)->y +
                screen_area(self->desktop)->height -
                self->frame->size.top - self->frame->size.bottom;
        }
    } else {
        long *dimensions;

        if (PROP_GET32A(self->window, openbox_premax, cardinal,
                        dimensions, 4)) {
            if (dir == 0 || dir == 1) { /* horz */
                x = dimensions[0];
                w = dimensions[2];
            }
            if (dir == 0 || dir == 2) { /* vert */
                y = dimensions[1];
                h = dimensions[3];
            }
            g_free(dimensions);
        } else {
            /* pick some fallbacks... */
            if (dir == 0 || dir == 1) { /* horz */
                x = screen_area(self->desktop)->x +
                    screen_area(self->desktop)->width / 4;
                w = screen_area(self->desktop)->width / 2;
            }
            if (dir == 0 || dir == 2) { /* vert */
                y = screen_area(self->desktop)->y +
                    screen_area(self->desktop)->height / 4;
                h = screen_area(self->desktop)->height / 2;
            }
        }
    }

    if (dir == 0 || dir == 1) /* horz */
        self->max_horz = max;
    if (dir == 0 || dir == 2) /* vert */
        self->max_vert = max;

    if (!self->max_horz && !self->max_vert)
        PROP_ERASE(self->window, openbox_premax);

    client_change_state(self); /* change the state hints on the client */

    /* figure out where the client should be going */
    frame_frame_gravity(self->frame, &x, &y);
    client_configure(self, Corner_TopLeft, x, y, w, h, TRUE, TRUE);
}

void client_shade(Client *self, gboolean shade)
{
    if (!(self->functions & Func_Shade) || /* can't */
        self->shaded == shade) return;     /* already done */

    /* when we're iconic, don't change the wmstate */
    if (!self->iconic)
        self->wmstate = shade ? IconicState : NormalState;
    self->shaded = shade;
    client_change_state(self);
    engine_frame_adjust_size(self->frame);
}

void client_close(Client *self)
{
    XEvent ce;

    if (!(self->functions & Func_Close)) return;

    /*
      XXX: itd be cool to do timeouts and shit here for killing the client's
      process off
      like... if the window is around after 5 seconds, then the close button
      turns a nice red, and if this function is called again, the client is
      explicitly killed.
    */

    ce.xclient.type = ClientMessage;
    ce.xclient.message_type =  prop_atoms.wm_protocols;
    ce.xclient.display = ob_display;
    ce.xclient.window = self->window;
    ce.xclient.format = 32;
    ce.xclient.data.l[0] = prop_atoms.wm_delete_window;
    ce.xclient.data.l[1] = CurrentTime;
    ce.xclient.data.l[2] = 0l;
    ce.xclient.data.l[3] = 0l;
    ce.xclient.data.l[4] = 0l;
    XSendEvent(ob_display, self->window, FALSE, NoEventMask, &ce);
}

void client_set_desktop(Client *self, unsigned int target)
{
    if (target == self->desktop) return;
  
    g_message("Setting desktop %u\n", target);

    if (!(target < screen_num_desktops ||
          target == DESKTOP_ALL))
        return;

    self->desktop = target;
    PROP_SET32(self->window, net_wm_desktop, cardinal, target);
    /* the frame can display the current desktop state */
    engine_frame_adjust_state(self->frame);
    /* 'move' the window to the new desktop */
    client_showhide(self);
    screen_update_struts();
}

static Client *search_modal_tree(Client *node, Client *skip)
{
    GSList *it;
    Client *ret;
  
    for (it = node->transients; it != NULL; it = it->next) {
        Client *c = it->data;
        if (c == skip) continue; /* circular? */
        if ((ret = search_modal_tree(c, skip))) return ret;
        if (c->modal) return c;
    }
    return NULL;
}

Client *client_find_modal_child(Client *self)
{
    return search_modal_tree(self, self);
}

gboolean client_validate(Client *self)
{
    XEvent e; 

    XSync(ob_display, FALSE); /* get all events on the server */

    if (XCheckTypedWindowEvent(ob_display, self->window, DestroyNotify, &e) ||
        XCheckTypedWindowEvent(ob_display, self->window, UnmapNotify, &e)) {
        XPutBackEvent(ob_display, &e);
        return FALSE;
    }

    return TRUE;
}

void client_set_wm_state(Client *self, long state)
{
    if (state == self->wmstate) return; /* no change */
  
    switch (state) {
    case IconicState:
        client_iconify(self, TRUE, TRUE);
        break;
    case NormalState:
        client_iconify(self, FALSE, TRUE);
        break;
    }
}

void client_set_state(Client *self, Atom action, long data1, long data2)
{
    gboolean shaded = self->shaded;
    gboolean fullscreen = self->fullscreen;
    gboolean max_horz = self->max_horz;
    gboolean max_vert = self->max_vert;
    int i;

    if (!(action == prop_atoms.net_wm_state_add ||
          action == prop_atoms.net_wm_state_remove ||
          action == prop_atoms.net_wm_state_toggle))
        /* an invalid action was passed to the client message, ignore it */
        return; 

    for (i = 0; i < 2; ++i) {
        Atom state = i == 0 ? data1 : data2;
    
        if (!state) continue;

        /* if toggling, then pick whether we're adding or removing */
        if (action == prop_atoms.net_wm_state_toggle) {
            if (state == prop_atoms.net_wm_state_modal)
                action = self->modal ? prop_atoms.net_wm_state_remove :
                    prop_atoms.net_wm_state_add;
            else if (state == prop_atoms.net_wm_state_maximized_vert)
                action = self->max_vert ? prop_atoms.net_wm_state_remove :
                    prop_atoms.net_wm_state_add;
            else if (state == prop_atoms.net_wm_state_maximized_horz)
                action = self->max_horz ? prop_atoms.net_wm_state_remove :
                    prop_atoms.net_wm_state_add;
            else if (state == prop_atoms.net_wm_state_shaded)
                action = self->shaded ? prop_atoms.net_wm_state_remove :
                    prop_atoms.net_wm_state_add;
            else if (state == prop_atoms.net_wm_state_skip_taskbar)
                action = self->skip_taskbar ?
                    prop_atoms.net_wm_state_remove :
                    prop_atoms.net_wm_state_add;
            else if (state == prop_atoms.net_wm_state_skip_pager)
                action = self->skip_pager ?
                    prop_atoms.net_wm_state_remove :
                    prop_atoms.net_wm_state_add;
            else if (state == prop_atoms.net_wm_state_fullscreen)
                action = self->fullscreen ?
                    prop_atoms.net_wm_state_remove :
                    prop_atoms.net_wm_state_add;
            else if (state == prop_atoms.net_wm_state_above)
                action = self->above ? prop_atoms.net_wm_state_remove :
                    prop_atoms.net_wm_state_add;
            else if (state == prop_atoms.net_wm_state_below)
                action = self->below ? prop_atoms.net_wm_state_remove :
                    prop_atoms.net_wm_state_add;
        }
    
        if (action == prop_atoms.net_wm_state_add) {
            if (state == prop_atoms.net_wm_state_modal) {
                /* XXX raise here or something? */
                self->modal = TRUE;
            } else if (state == prop_atoms.net_wm_state_maximized_vert) {
                max_vert = TRUE;
            } else if (state == prop_atoms.net_wm_state_maximized_horz) {
                max_horz = TRUE;
            } else if (state == prop_atoms.net_wm_state_shaded) {
                shaded = TRUE;
            } else if (state == prop_atoms.net_wm_state_skip_taskbar) {
                self->skip_taskbar = TRUE;
            } else if (state == prop_atoms.net_wm_state_skip_pager) {
                self->skip_pager = TRUE;
            } else if (state == prop_atoms.net_wm_state_fullscreen) {
                fullscreen = TRUE;
            } else if (state == prop_atoms.net_wm_state_above) {
                self->above = TRUE;
            } else if (state == prop_atoms.net_wm_state_below) {
                self->below = TRUE;
            }

        } else { /* action == prop_atoms.net_wm_state_remove */
            if (state == prop_atoms.net_wm_state_modal) {
                self->modal = FALSE;
            } else if (state == prop_atoms.net_wm_state_maximized_vert) {
                max_vert = FALSE;
            } else if (state == prop_atoms.net_wm_state_maximized_horz) {
                max_horz = FALSE;
            } else if (state == prop_atoms.net_wm_state_shaded) {
                shaded = FALSE;
            } else if (state == prop_atoms.net_wm_state_skip_taskbar) {
                self->skip_taskbar = FALSE;
            } else if (state == prop_atoms.net_wm_state_skip_pager) {
                self->skip_pager = FALSE;
            } else if (state == prop_atoms.net_wm_state_fullscreen) {
                fullscreen = FALSE;
            } else if (state == prop_atoms.net_wm_state_above) {
                self->above = FALSE;
            } else if (state == prop_atoms.net_wm_state_below) {
                self->below = FALSE;
            }
        }
    }
    if (max_horz != self->max_horz || max_vert != self->max_vert) {
        if (max_horz != self->max_horz && max_vert != self->max_vert) {
            /* toggling both */
            if (max_horz == max_vert) { /* both going the same way */
                client_maximize(self, max_horz, 0, TRUE);
            } else {
                client_maximize(self, max_horz, 1, TRUE);
                client_maximize(self, max_vert, 2, TRUE);
            }
        } else {
            /* toggling one */
            if (max_horz != self->max_horz)
                client_maximize(self, max_horz, 1, TRUE);
            else
                client_maximize(self, max_vert, 2, TRUE);
        }
    }
    /* change fullscreen state before shading, as it will affect if the window
       can shade or not */
    if (fullscreen != self->fullscreen)
        client_fullscreen(self, fullscreen, TRUE);
    if (shaded != self->shaded)
        client_shade(self, shaded);
    client_calc_layer(self);
    client_change_state(self); /* change the hint to relect these changes */
}

gboolean client_focus(Client *self)
{
    XEvent ev;
    Client *child;
     
    /* if we have a modal child, then focus it, not us */
    child = client_find_modal_child(self);
    if (child)
        return client_focus(child);

    /* won't try focus if the client doesn't want it, or if the window isn't
       visible on the screen */
    if (!(self->frame->visible &&
          (self->can_focus || self->focus_notify)))
        return FALSE;

    /* do a check to see if the window has already been unmapped or destroyed
       do this intelligently while watching out for unmaps we've generated
       (ignore_unmaps > 0) */
    if (XCheckTypedWindowEvent(ob_display, self->window,
                               DestroyNotify, &ev)) {
        XPutBackEvent(ob_display, &ev);
        return FALSE;
    }
    while (XCheckTypedWindowEvent(ob_display, self->window,
                                  UnmapNotify, &ev)) {
        if (self->ignore_unmaps) {
            self->ignore_unmaps--;
        } else {
            XPutBackEvent(ob_display, &ev);
            return FALSE;
        }
    }
     
    if (self->can_focus)
        XSetInputFocus(ob_display, self->window, RevertToNone, CurrentTime);

    if (self->focus_notify) {
        XEvent ce;
        ce.xclient.type = ClientMessage;
        ce.xclient.message_type = prop_atoms.wm_protocols;
        ce.xclient.display = ob_display;
        ce.xclient.window = self->window;
        ce.xclient.format = 32;
        ce.xclient.data.l[0] = prop_atoms.wm_take_focus;
        ce.xclient.data.l[1] = event_lasttime;
        ce.xclient.data.l[2] = 0l;
        ce.xclient.data.l[3] = 0l;
        ce.xclient.data.l[4] = 0l;
        XSendEvent(ob_display, self->window, FALSE, NoEventMask, &ce);
    }

    /*XSync(ob_display, FALSE); XXX Why sync? */
    return TRUE;
}

void client_unfocus(Client *self)
{
    g_assert(focus_client == self);
    focus_set_client(NULL);
}