properly handle clients disappearing during delayed focus on them

[chaz/openbox] / openbox / event.c

/* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-

   event.c for the Openbox window manager
   Copyright (c) 2006        Mikael Magnusson
   Copyright (c) 2003        Ben Jansens

   This program 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 2 of the License, or
   (at your option) any later version.

   This program 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.

   See the COPYING file for a copy of the GNU General Public License.
*/

#include "event.h"
#include "debug.h"
#include "window.h"
#include "openbox.h"
#include "dock.h"
#include "client.h"
#include "xerror.h"
#include "prop.h"
#include "config.h"
#include "screen.h"
#include "frame.h"
#include "menu.h"
#include "menuframe.h"
#include "keyboard.h"
#include "mouse.h"
#include "mainloop.h"
#include "framerender.h"
#include "focus.h"
#include "moveresize.h"
#include "group.h"
#include "stacking.h"
#include "extensions.h"

#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>
#include <glib.h>

#ifdef HAVE_SYS_SELECT_H
#  include <sys/select.h>
#endif
#ifdef HAVE_SIGNAL_H
#  include <signal.h>
#endif
#ifdef XKB
#  include <X11/XKBlib.h>
#endif

#ifdef USE_SM
#include <X11/ICE/ICElib.h>
#endif

typedef struct
{
    gboolean ignored;
} ObEventData;

typedef struct
{
    ObClient *client;
    Time time;
} ObFocusDelayData;

static void event_process(const XEvent *e, gpointer data);
static void event_client_dest(ObClient *client, gpointer data);
static void event_handle_root(XEvent *e);
static void event_handle_menu(XEvent *e);
static void event_handle_dock(ObDock *s, XEvent *e);
static void event_handle_dockapp(ObDockApp *app, XEvent *e);
static void event_handle_client(ObClient *c, XEvent *e);
static void event_handle_group(ObGroup *g, XEvent *e);

static void focus_delay_destroy(gpointer data);
static gboolean focus_delay_func(gpointer data);
static void focus_delay_client_dest(ObClient *client, gpointer data);

static gboolean menu_hide_delay_func(gpointer data);

/* The time for the current event being processed */
Time event_curtime = CurrentTime;

/*! The value of the mask for the NumLock modifier */
guint NumLockMask;
/*! The value of the mask for the ScrollLock modifier */
guint ScrollLockMask;
/*! The key codes for the modifier keys */
static XModifierKeymap *modmap;
/*! Table of the constant modifier masks */
static const gint mask_table[] = {
    ShiftMask, LockMask, ControlMask, Mod1Mask,
    Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
};
static gint mask_table_size;

static guint ignore_enter_focus = 0;

static gboolean menu_can_hide;

static ObFocusDelayData focus_delay_data = { .client = NULL,
                                             .time = CurrentTime };



#ifdef USE_SM
static void ice_handler(gint fd, gpointer conn)
{
    Bool b;
    IceProcessMessages(conn, NULL, &b);
}

static void ice_watch(IceConn conn, IcePointer data, Bool opening,
                      IcePointer *watch_data)
{
    static gint fd = -1;

    if (opening) {
        fd = IceConnectionNumber(conn);
        ob_main_loop_fd_add(ob_main_loop, fd, ice_handler, conn, NULL);
    } else {
        ob_main_loop_fd_remove(ob_main_loop, fd);
        fd = -1;
    }
}
#endif

void event_startup(gboolean reconfig)
{
    if (reconfig) return;

    mask_table_size = sizeof(mask_table) / sizeof(mask_table[0]);
     
    /* get lock masks that are defined by the display (not constant) */
    modmap = XGetModifierMapping(ob_display);
    g_assert(modmap);
    if (modmap && modmap->max_keypermod > 0) {
        size_t cnt;
        const size_t size = mask_table_size * modmap->max_keypermod;
        /* get the values of the keyboard lock modifiers
           Note: Caps lock is not retrieved the same way as Scroll and Num
           lock since it doesn't need to be. */
        const KeyCode num_lock = XKeysymToKeycode(ob_display, XK_Num_Lock);
        const KeyCode scroll_lock = XKeysymToKeycode(ob_display,
                                                     XK_Scroll_Lock);

        for (cnt = 0; cnt < size; ++cnt) {
            if (! modmap->modifiermap[cnt]) continue;

            if (num_lock == modmap->modifiermap[cnt])
                NumLockMask = mask_table[cnt / modmap->max_keypermod];
            if (scroll_lock == modmap->modifiermap[cnt])
                ScrollLockMask = mask_table[cnt / modmap->max_keypermod];
        }
    }

    ob_main_loop_x_add(ob_main_loop, event_process, NULL, NULL);

#ifdef USE_SM
    IceAddConnectionWatch(ice_watch, NULL);
#endif

    client_add_destructor(focus_delay_client_dest, NULL);
    client_add_destructor(event_client_dest, NULL);
}

void event_shutdown(gboolean reconfig)
{
    if (reconfig) return;

#ifdef USE_SM
    IceRemoveConnectionWatch(ice_watch, NULL);
#endif

    client_remove_destructor(focus_delay_client_dest);
    client_remove_destructor(event_client_dest);
    XFreeModifiermap(modmap);
}

static Window event_get_window(XEvent *e)
{
    Window window;

    /* pick a window */
    switch (e->type) {
    case SelectionClear:
        window = RootWindow(ob_display, ob_screen);
        break;
    case MapRequest:
        window = e->xmap.window;
        break;
    case UnmapNotify:
        window = e->xunmap.window;
        break;
    case DestroyNotify:
        window = e->xdestroywindow.window;
        break;
    case ConfigureRequest:
        window = e->xconfigurerequest.window;
        break;
    case ConfigureNotify:
        window = e->xconfigure.window;
        break;
    default:
#ifdef XKB
        if (extensions_xkb && e->type == extensions_xkb_event_basep) {
            switch (((XkbAnyEvent*)e)->xkb_type) {
            case XkbBellNotify:
                window = ((XkbBellNotifyEvent*)e)->window;
            default:
                window = None;
            }
        } else
#endif
            window = e->xany.window;
    }
    return window;
}

static void event_set_curtime(XEvent *e)
{
    Time t = CurrentTime;

    /* grab the lasttime and hack up the state */
    switch (e->type) {
    case ButtonPress:
    case ButtonRelease:
        t = e->xbutton.time;
        break;
    case KeyPress:
        t = e->xkey.time;
        break;
    case KeyRelease:
        t = e->xkey.time;
        break;
    case MotionNotify:
        t = e->xmotion.time;
        break;
    case PropertyNotify:
        t = e->xproperty.time;
        break;
    case EnterNotify:
    case LeaveNotify:
        t = e->xcrossing.time;
        break;
    default:
        /* if more event types are anticipated, get their timestamp
           explicitly */
        break;
    }

    event_curtime = t;
}

#define STRIP_MODS(s) \
        s &= ~(LockMask | NumLockMask | ScrollLockMask), \
        /* kill off the Button1Mask etc, only want the modifiers */ \
        s &= (ControlMask | ShiftMask | Mod1Mask | \
              Mod2Mask | Mod3Mask | Mod4Mask | Mod5Mask) \

static void event_hack_mods(XEvent *e)
{
#ifdef XKB
    XkbStateRec xkb_state;
#endif
    KeyCode *kp;
    gint i, k;

    switch (e->type) {
    case ButtonPress:
    case ButtonRelease:
        STRIP_MODS(e->xbutton.state);
        break;
    case KeyPress:
        STRIP_MODS(e->xkey.state);
        break;
    case KeyRelease:
        STRIP_MODS(e->xkey.state);
        /* remove from the state the mask of the modifier being released, if
           it is a modifier key being released (this is a little ugly..) */
#ifdef XKB
        if (XkbGetState(ob_display, XkbUseCoreKbd, &xkb_state) == Success) {
            e->xkey.state = xkb_state.compat_state;
            break;
        }
#endif
        kp = modmap->modifiermap;
        for (i = 0; i < mask_table_size; ++i) {
            for (k = 0; k < modmap->max_keypermod; ++k) {
                if (*kp == e->xkey.keycode) { /* found the keycode */
                    /* remove the mask for it */
                    e->xkey.state &= ~mask_table[i];
                    /* cause the first loop to break; */
                    i = mask_table_size;
                    break; /* get outta here! */
                }
                ++kp;
            }
        }
        break;
    case MotionNotify:
        STRIP_MODS(e->xmotion.state);
        /* compress events */
        {
            XEvent ce;
            while (XCheckTypedWindowEvent(ob_display, e->xmotion.window,
                                          e->type, &ce)) {
                e->xmotion.x_root = ce.xmotion.x_root;
                e->xmotion.y_root = ce.xmotion.y_root;
            }
        }
        break;
    }
}

static gboolean wanted_focusevent(XEvent *e)
{
    gint mode = e->xfocus.mode;
    gint detail = e->xfocus.detail;
    Window win = e->xany.window;

    if (e->type == FocusIn) {

        /* These are ones we never want.. */

        /* This means focus was given by a keyboard/mouse grab. */
        if (mode == NotifyGrab)
            return FALSE;
        /* This means focus was given back from a keyboard/mouse grab. */
        if (mode == NotifyUngrab)
            return FALSE;

        /* These are the ones we want.. */

        if (win == RootWindow(ob_display, ob_screen)) {
            /* This means focus reverted off of a client */
            if (detail == NotifyPointerRoot || detail == NotifyDetailNone ||
                detail == NotifyInferior)
                return TRUE;
            else
                return FALSE;
        }

        /* This means focus moved from the root window to a client */
        if (detail == NotifyVirtual)
            return TRUE;
        /* This means focus moved from one client to another */
        if (detail == NotifyNonlinearVirtual)
            return TRUE;

        /* This means focus reverted off of a client */
        if (detail == NotifyInferior)
            return TRUE;

        /* Otherwise.. */
        return FALSE;
    } else {
        g_assert(e->type == FocusOut);


        /* These are ones we never want.. */

        /* This means focus was taken by a keyboard/mouse grab. */
        if (mode == NotifyGrab)
            return FALSE;

        /* Focus left the root window revertedto state */
        if (win == RootWindow(ob_display, ob_screen))
            return FALSE;

        /* These are the ones we want.. */

        /* This means focus moved from a client to the root window */
        if (detail == NotifyVirtual)
            return TRUE;
        /* This means focus moved from one client to another */
        if (detail == NotifyNonlinearVirtual)
            return TRUE;

        /* Otherwise.. */
        return FALSE;
    }
}

static Bool look_for_focusin(Display *d, XEvent *e, XPointer arg)
{
    return e->type == FocusIn && wanted_focusevent(e);
}

static gboolean event_ignore(XEvent *e, ObClient *client)
{
    switch(e->type) {
    case EnterNotify:
    case LeaveNotify:
        return keyboard_interactively_grabbed();
    case FocusIn:
    case FocusOut:
        /* I don't think this should ever happen with our event masks, but
           if it does, we don't want it. */
        if (client == NULL)
            return TRUE;
        if (!wanted_focusevent(e))
            return TRUE;
        break;
    }
    return FALSE;
}

static void event_process(const XEvent *ec, gpointer data)
{
    Window window;
    ObGroup *group = NULL;
    ObClient *client = NULL;
    ObDock *dock = NULL;
    ObDockApp *dockapp = NULL;
    ObWindow *obwin = NULL;
    XEvent ee, *e;
    ObEventData *ed = data;

    /* make a copy we can mangle */
    ee = *ec;
    e = &ee;

    window = event_get_window(e);
    if (!(e->type == PropertyNotify &&
          (group = g_hash_table_lookup(group_map, &window))))
        if ((obwin = g_hash_table_lookup(window_map, &window))) {
            switch (obwin->type) {
            case Window_Dock:
                dock = WINDOW_AS_DOCK(obwin);
                break;
            case Window_DockApp:
                dockapp = WINDOW_AS_DOCKAPP(obwin);
                break;
            case Window_Client:
                client = WINDOW_AS_CLIENT(obwin);
                break;
            case Window_Menu:
            case Window_Internal:
                /* not to be used for events */
                g_assert_not_reached();
                break;
            }
        }

    if (e->type == FocusIn || e->type == FocusOut) {
        gint mode = e->xfocus.mode;
        gint detail = e->xfocus.detail;
        Window window = e->xfocus.window;
        if (detail == NotifyVirtual) {
            ob_debug_type(OB_DEBUG_FOCUS,
                          "FOCUS %s NOTIFY VIRTUAL window 0x%x\n",
                          (e->type == FocusIn ? "IN" : "OUT"), window);
        }

        else if (detail == NotifyNonlinearVirtual) {
            ob_debug_type(OB_DEBUG_FOCUS,
                          "FOCUS %s NOTIFY NONLINVIRTUAL window 0x%x\n",
                          (e->type == FocusIn ? "IN" : "OUT"), window);
        }

        else
            ob_debug_type(OB_DEBUG_FOCUS,
                          "UNKNOWN FOCUS %s (d %d, m %d) window 0x%x\n",
                          (e->type == FocusIn ? "IN" : "OUT"),
                          detail, mode, window);
    }

    event_set_curtime(e);
    event_hack_mods(e);
    if (event_ignore(e, client)) {
        if (ed)
            ed->ignored = TRUE;
        return;
    } else if (ed)
            ed->ignored = FALSE;

    /* deal with it in the kernel */

    if (menu_frame_visible &&
        (e->type == EnterNotify || e->type == LeaveNotify))
    {
        /* crossing events for menu */
        event_handle_menu(e);
    } else if (group)
        event_handle_group(group, e);
    else if (client)
        event_handle_client(client, e);
    else if (dockapp)
        event_handle_dockapp(dockapp, e);
    else if (dock)
        event_handle_dock(dock, e);
    else if (window == RootWindow(ob_display, ob_screen))
        event_handle_root(e);
    else if (e->type == MapRequest)
        client_manage(window);
    else if (e->type == ConfigureRequest) {
        /* unhandled configure requests must be used to configure the
           window directly */
        XWindowChanges xwc;

        xwc.x = e->xconfigurerequest.x;
        xwc.y = e->xconfigurerequest.y;
        xwc.width = e->xconfigurerequest.width;
        xwc.height = e->xconfigurerequest.height;
        xwc.border_width = e->xconfigurerequest.border_width;
        xwc.sibling = e->xconfigurerequest.above;
        xwc.stack_mode = e->xconfigurerequest.detail;
       
        /* we are not to be held responsible if someone sends us an
           invalid request! */
        xerror_set_ignore(TRUE);
        XConfigureWindow(ob_display, window,
                         e->xconfigurerequest.value_mask, &xwc);
        xerror_set_ignore(FALSE);
    }

    /* user input (action-bound) events */
    if (e->type == ButtonPress || e->type == ButtonRelease ||
        e->type == MotionNotify || e->type == KeyPress ||
        e->type == KeyRelease)
    {
        if (menu_frame_visible)
            event_handle_menu(e);
        else {
            if (!keyboard_process_interactive_grab(e, &client)) {
                if (moveresize_in_progress) {
                    moveresize_event(e);

                    /* make further actions work on the client being
                       moved/resized */
                    client = moveresize_client;
                }

                menu_can_hide = FALSE;
                ob_main_loop_timeout_add(ob_main_loop,
                                         config_menu_hide_delay * 1000,
                                         menu_hide_delay_func,
                                         NULL, NULL);

                if (e->type == ButtonPress || e->type == ButtonRelease ||
                    e->type == MotionNotify)
                    mouse_event(client, e);
                else if (e->type == KeyPress) {
                    keyboard_event((focus_cycle_target ? focus_cycle_target :
                                    (focus_hilite ? focus_hilite : client)),
                                   e);
                }
            }
        }
    }
    /* if something happens and it's not from an XEvent, then we don't know
       the time */
    event_curtime = CurrentTime;
}

static void event_handle_root(XEvent *e)
{
    Atom msgtype;
     
    switch(e->type) {
    case SelectionClear:
        ob_debug("Another WM has requested to replace us. Exiting.\n");
        ob_exit_replace();
        break;

    case ClientMessage:
        if (e->xclient.format != 32) break;

        msgtype = e->xclient.message_type;
        if (msgtype == prop_atoms.net_current_desktop) {
            guint d = e->xclient.data.l[0];
            if (d < screen_num_desktops) {
                event_curtime = e->xclient.data.l[1];
                ob_debug("SWITCH DESKTOP TIME: %d\n", event_curtime);
                screen_set_desktop(d);
            }
        } else if (msgtype == prop_atoms.net_number_of_desktops) {
            guint d = e->xclient.data.l[0];
            if (d > 0)
                screen_set_num_desktops(d);
        } else if (msgtype == prop_atoms.net_showing_desktop) {
            screen_show_desktop(e->xclient.data.l[0] != 0);
        } else if (msgtype == prop_atoms.ob_control) {
            if (e->xclient.data.l[0] == 1)
                ob_reconfigure();
            else if (e->xclient.data.l[0] == 2)
                ob_restart();
        }
        break;
    case PropertyNotify:
        if (e->xproperty.atom == prop_atoms.net_desktop_names)
            screen_update_desktop_names();
        else if (e->xproperty.atom == prop_atoms.net_desktop_layout)
            screen_update_layout();
        break;
    case ConfigureNotify:
#ifdef XRANDR
        XRRUpdateConfiguration(e);
#endif
        screen_resize();
        break;
    default:
        ;
    }
}

static void event_handle_group(ObGroup *group, XEvent *e)
{
    GSList *it;

    g_assert(e->type == PropertyNotify);

    for (it = group->members; it; it = g_slist_next(it))
        event_handle_client(it->data, e);
}

void event_enter_client(ObClient *client)
{
    g_assert(config_focus_follow);

    if (client_normal(client) && client_can_focus(client)) {
        if (config_focus_delay) {
            ob_main_loop_timeout_remove(ob_main_loop, focus_delay_func);

            focus_delay_data.client = client;
            focus_delay_data.time = event_curtime;

            ob_main_loop_timeout_add(ob_main_loop,
                                     config_focus_delay,
                                     focus_delay_func,
                                     NULL, focus_delay_destroy);
        } else
            focus_delay_func(NULL);
    }
}

static void event_handle_client(ObClient *client, XEvent *e)
{
    XEvent ce;
    Atom msgtype;
    gint i=0;
    ObFrameContext con;
     
    switch (e->type) {
    case VisibilityNotify:
        client->frame->obscured = e->xvisibility.state != VisibilityUnobscured;
        break;
    case ButtonPress:
    case ButtonRelease:
        /* Wheel buttons don't draw because they are an instant click, so it
           is a waste of resources to go drawing it. */
        if (!(e->xbutton.button == 4 || e->xbutton.button == 5)) {
            con = frame_context(client, e->xbutton.window);
            con = mouse_button_frame_context(con, e->xbutton.button);
            switch (con) {
            case OB_FRAME_CONTEXT_MAXIMIZE:
                client->frame->max_press = (e->type == ButtonPress);
                framerender_frame(client->frame);
                break;
            case OB_FRAME_CONTEXT_CLOSE:
                client->frame->close_press = (e->type == ButtonPress);
                framerender_frame(client->frame);
                break;
            case OB_FRAME_CONTEXT_ICONIFY:
                client->frame->iconify_press = (e->type == ButtonPress);
                framerender_frame(client->frame);
                break;
            case OB_FRAME_CONTEXT_ALLDESKTOPS:
                client->frame->desk_press = (e->type == ButtonPress);
                framerender_frame(client->frame);
                break; 
            case OB_FRAME_CONTEXT_SHADE:
                client->frame->shade_press = (e->type == ButtonPress);
                framerender_frame(client->frame);
                break;
            default:
                /* nothing changes with clicks for any other contexts */
                break;
            }
        }
        break;
    case FocusIn:
        if (client != focus_client) {
            focus_set_client(client);
            frame_adjust_focus(client->frame, TRUE);
            client_calc_layer(client);
        }
        break;
    case FocusOut:
        /* Look for the followup FocusIn */
        if (!XCheckIfEvent(ob_display, &ce, look_for_focusin, NULL)) {
            /* There is no FocusIn, this means focus went to a window that
               is not being managed, or a window on another screen. */
            ob_debug_type(OB_DEBUG_FOCUS, "Focus went to a black hole !\n");
        } else if (ce.xany.window == e->xany.window) {
            /* If focus didn't actually move anywhere, there is nothing to do*/
            break;
        } else if (ce.xfocus.detail == NotifyPointerRoot ||
                 ce.xfocus.detail == NotifyDetailNone) {
            ob_debug_type(OB_DEBUG_FOCUS, "Focus went to root\n");
            /* Focus has been reverted to the root window or nothing, so fall
               back to something other than the window which just had it. */
            focus_fallback(FALSE);
        } else if (ce.xfocus.detail == NotifyInferior) {
            ob_debug_type(OB_DEBUG_FOCUS, "Focus went to parent\n");
            /* Focus has been reverted to parent, which is our frame window,
               or the root window, so fall back to something other than the
               window which had it. */
            focus_fallback(FALSE);
        } else {
            /* Focus did move, so process the FocusIn event */
            ObEventData ed = { .ignored = FALSE };
            event_process(&ce, &ed);
            if (ed.ignored) {
                /* The FocusIn was ignored, this means it was on a window
                   that isn't a client. */
                ob_debug_type(OB_DEBUG_FOCUS,
                              "Focus went to an unmanaged window 0x%x !\n",
                              ce.xfocus.window);
                focus_fallback(TRUE);
            }
        }

        /* This client is no longer focused, so show that */
        focus_hilite = NULL;
        frame_adjust_focus(client->frame, FALSE);
        client_calc_layer(client);
        break;
    case LeaveNotify:
        con = frame_context(client, e->xcrossing.window);
        switch (con) {
        case OB_FRAME_CONTEXT_MAXIMIZE:
            client->frame->max_hover = FALSE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_ALLDESKTOPS:
            client->frame->desk_hover = FALSE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_SHADE:
            client->frame->shade_hover = FALSE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_ICONIFY:
            client->frame->iconify_hover = FALSE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_CLOSE:
            client->frame->close_hover = FALSE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_FRAME:
            if (config_focus_follow && config_focus_delay)
                ob_main_loop_timeout_remove_data(ob_main_loop,
                                                 focus_delay_func,
                                                 client, TRUE);
            break;
        default:
            break;
        }
        break;
    case EnterNotify:
    {
        gboolean nofocus = FALSE;

        if (ignore_enter_focus) {
            ignore_enter_focus--;
            nofocus = TRUE;
        }

        con = frame_context(client, e->xcrossing.window);
        switch (con) {
        case OB_FRAME_CONTEXT_MAXIMIZE:
            client->frame->max_hover = TRUE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_ALLDESKTOPS:
            client->frame->desk_hover = TRUE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_SHADE:
            client->frame->shade_hover = TRUE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_ICONIFY:
            client->frame->iconify_hover = TRUE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_CLOSE:
            client->frame->close_hover = TRUE;
            frame_adjust_state(client->frame);
            break;
        case OB_FRAME_CONTEXT_FRAME:
            if (e->xcrossing.mode == NotifyGrab ||
                e->xcrossing.mode == NotifyUngrab)
            {
                ob_debug_type(OB_DEBUG_FOCUS,
                              "%sNotify mode %d detail %d on %lx IGNORED\n",
                              (e->type == EnterNotify ? "Enter" : "Leave"),
                              e->xcrossing.mode,
                              e->xcrossing.detail, client?client->window:0);
            } else {
                ob_debug_type(OB_DEBUG_FOCUS,
                              "%sNotify mode %d detail %d on %lx, "
                              "focusing window: %d\n",
                              (e->type == EnterNotify ? "Enter" : "Leave"),
                              e->xcrossing.mode,
                              e->xcrossing.detail, (client?client->window:0),
                              !nofocus);
                if (!nofocus && config_focus_follow)
                    event_enter_client(client);
            }
            break;
        default:
            break;
        }
        break;
    }
    case ConfigureRequest:
        /* compress these */
        while (XCheckTypedWindowEvent(ob_display, client->window,
                                      ConfigureRequest, &ce)) {
            ++i;
            /* XXX if this causes bad things.. we can compress config req's
               with the same mask. */
            e->xconfigurerequest.value_mask |=
                ce.xconfigurerequest.value_mask;
            if (ce.xconfigurerequest.value_mask & CWX)
                e->xconfigurerequest.x = ce.xconfigurerequest.x;
            if (ce.xconfigurerequest.value_mask & CWY)
                e->xconfigurerequest.y = ce.xconfigurerequest.y;
            if (ce.xconfigurerequest.value_mask & CWWidth)
                e->xconfigurerequest.width = ce.xconfigurerequest.width;
            if (ce.xconfigurerequest.value_mask & CWHeight)
                e->xconfigurerequest.height = ce.xconfigurerequest.height;
            if (ce.xconfigurerequest.value_mask & CWBorderWidth)
                e->xconfigurerequest.border_width =
                    ce.xconfigurerequest.border_width;
            if (ce.xconfigurerequest.value_mask & CWStackMode)
                e->xconfigurerequest.detail = ce.xconfigurerequest.detail;
        }

        /* if we are iconic (or shaded (fvwm does this)) ignore the event */
        if (client->iconic || client->shaded) return;

        /* resize, then move, as specified in the EWMH section 7.7 */
        if (e->xconfigurerequest.value_mask & (CWWidth | CWHeight |
                                               CWX | CWY |
                                               CWBorderWidth)) {
            gint x, y, w, h;
            ObCorner corner;

            if (e->xconfigurerequest.value_mask & CWBorderWidth)
                client->border_width = e->xconfigurerequest.border_width;

            x = (e->xconfigurerequest.value_mask & CWX) ?
                e->xconfigurerequest.x : client->area.x;
            y = (e->xconfigurerequest.value_mask & CWY) ?
                e->xconfigurerequest.y : client->area.y;
            w = (e->xconfigurerequest.value_mask & CWWidth) ?
                e->xconfigurerequest.width : client->area.width;
            h = (e->xconfigurerequest.value_mask & CWHeight) ?
                e->xconfigurerequest.height : client->area.height;

            {
                gint newx = x;
                gint newy = y;
                gint fw = w +
                     client->frame->size.left + client->frame->size.right;
                gint fh = h +
                     client->frame->size.top + client->frame->size.bottom;
                /* make this rude for size-only changes but not for position
                   changes.. */
                gboolean moving = ((e->xconfigurerequest.value_mask & CWX) ||
                                   (e->xconfigurerequest.value_mask & CWY));

                client_find_onscreen(client, &newx, &newy, fw, fh,
                                     !moving);
                if (e->xconfigurerequest.value_mask & CWX)
                    x = newx;
                if (e->xconfigurerequest.value_mask & CWY)
                    y = newy;
            }

            switch (client->gravity) {
            case NorthEastGravity:
            case EastGravity:
                corner = OB_CORNER_TOPRIGHT;
                break;
            case SouthWestGravity:
            case SouthGravity:
                corner = OB_CORNER_BOTTOMLEFT;
                break;
            case SouthEastGravity:
                corner = OB_CORNER_BOTTOMRIGHT;
                break;
            default:     /* NorthWest, Static, etc */
                corner = OB_CORNER_TOPLEFT;
            }

            client_configure_full(client, corner, x, y, w, h, FALSE, TRUE,
                                  TRUE);
        }

        if (e->xconfigurerequest.value_mask & CWStackMode) {
            switch (e->xconfigurerequest.detail) {
            case Below:
            case BottomIf:
                /* Apps are so rude. And this is totally disconnected from
                   activation/focus. Bleh. */
                /*client_lower(client);*/
                break;

            case Above:
            case TopIf:
            default:
                /* Apps are so rude. And this is totally disconnected from
                   activation/focus. Bleh. */
                /*client_raise(client);*/
                break;
            }
        }
        break;
    case UnmapNotify:
        if (client->ignore_unmaps) {
            client->ignore_unmaps--;
            break;
        }
        ob_debug("UnmapNotify for window 0x%x eventwin 0x%x sendevent %d "
                 "ignores left %d\n",
                 client->window, e->xunmap.event, e->xunmap.from_configure,
                 client->ignore_unmaps);
        client_unmanage(client);
        break;
    case DestroyNotify:
        ob_debug("DestroyNotify for window 0x%x\n", client->window);
        client_unmanage(client);
        break;
    case ReparentNotify:
        /* this is when the client is first taken captive in the frame */
        if (e->xreparent.parent == client->frame->plate) break;

        /*
          This event is quite rare and is usually handled in unmapHandler.
          However, if the window is unmapped when the reparent event occurs,
          the window manager never sees it because an unmap event is not sent
          to an already unmapped window.
        */

        /* we don't want the reparent event, put it back on the stack for the
           X server to deal with after we unmanage the window */
        XPutBackEvent(ob_display, e);
     
        ob_debug("ReparentNotify for window 0x%x\n", client->window);
        client_unmanage(client);
        break;
    case MapRequest:
        ob_debug("MapRequest for 0x%lx\n", client->window);
        if (!client->iconic) break; /* this normally doesn't happen, but if it
                                       does, we don't want it!
                                       it can happen now when the window is on
                                       another desktop, but we still don't
                                       want it! */
        client_activate(client, FALSE, TRUE);
        break;
    case ClientMessage:
        /* validate cuz we query stuff off the client here */
        if (!client_validate(client)) break;

        if (e->xclient.format != 32) return;

        msgtype = e->xclient.message_type;
        if (msgtype == prop_atoms.wm_change_state) {
            /* compress changes into a single change */
            while (XCheckTypedWindowEvent(ob_display, client->window,
                                          e->type, &ce)) {
                /* XXX: it would be nice to compress ALL messages of a
                   type, not just messages in a row without other
                   message types between. */
                if (ce.xclient.message_type != msgtype) {
                    XPutBackEvent(ob_display, &ce);
                    break;
                }
                e->xclient = ce.xclient;
            }
            client_set_wm_state(client, e->xclient.data.l[0]);
        } else if (msgtype == prop_atoms.net_wm_desktop) {
            /* compress changes into a single change */
            while (XCheckTypedWindowEvent(ob_display, client->window,
                                          e->type, &ce)) {
                /* XXX: it would be nice to compress ALL messages of a
                   type, not just messages in a row without other
                   message types between. */
                if (ce.xclient.message_type != msgtype) {
                    XPutBackEvent(ob_display, &ce);
                    break;
                }
                e->xclient = ce.xclient;
            }
            if ((unsigned)e->xclient.data.l[0] < screen_num_desktops ||
                (unsigned)e->xclient.data.l[0] == DESKTOP_ALL)
                client_set_desktop(client, (unsigned)e->xclient.data.l[0],
                                   FALSE);
        } else if (msgtype == prop_atoms.net_wm_state) {
            /* can't compress these */
            ob_debug("net_wm_state %s %ld %ld for 0x%lx\n",
                     (e->xclient.data.l[0] == 0 ? "Remove" :
                      e->xclient.data.l[0] == 1 ? "Add" :
                      e->xclient.data.l[0] == 2 ? "Toggle" : "INVALID"),
                     e->xclient.data.l[1], e->xclient.data.l[2],
                     client->window);
            client_set_state(client, e->xclient.data.l[0],
                             e->xclient.data.l[1], e->xclient.data.l[2]);
        } else if (msgtype == prop_atoms.net_close_window) {
            ob_debug("net_close_window for 0x%lx\n", client->window);
            client_close(client);
        } else if (msgtype == prop_atoms.net_active_window) {
            ob_debug("net_active_window for 0x%lx source=%s\n",
                     client->window,
                     (e->xclient.data.l[0] == 0 ? "unknown" :
                      (e->xclient.data.l[0] == 1 ? "application" :
                       (e->xclient.data.l[0] == 2 ? "user" : "INVALID"))));
            /* XXX make use of data.l[2] ! */
            event_curtime = e->xclient.data.l[1];
            client_activate(client, FALSE,
                            (e->xclient.data.l[0] == 0 ||
                             e->xclient.data.l[0] == 2));
        } else if (msgtype == prop_atoms.net_wm_moveresize) {
            ob_debug("net_wm_moveresize for 0x%lx direction %d\n",
                     client->window, e->xclient.data.l[2]);
            if ((Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_topleft ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_top ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_topright ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_right ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_right ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_bottomright ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_bottom ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_bottomleft ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_left ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_move ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_size_keyboard ||
                (Atom)e->xclient.data.l[2] ==
                prop_atoms.net_wm_moveresize_move_keyboard) {

                moveresize_start(client, e->xclient.data.l[0],
                                 e->xclient.data.l[1], e->xclient.data.l[3],
                                 e->xclient.data.l[2]);
            }
            else if ((Atom)e->xclient.data.l[2] ==
                     prop_atoms.net_wm_moveresize_cancel)
                moveresize_end(TRUE);
        } else if (msgtype == prop_atoms.net_moveresize_window) {
            gint oldg = client->gravity;
            gint tmpg, x, y, w, h;

            if (e->xclient.data.l[0] & 0xff)
                tmpg = e->xclient.data.l[0] & 0xff;
            else
                tmpg = oldg;

            if (e->xclient.data.l[0] & 1 << 8)
                x = e->xclient.data.l[1];
            else
                x = client->area.x;
            if (e->xclient.data.l[0] & 1 << 9)
                y = e->xclient.data.l[2];
            else
                y = client->area.y;
            if (e->xclient.data.l[0] & 1 << 10)
                w = e->xclient.data.l[3];
            else
                w = client->area.width;
            if (e->xclient.data.l[0] & 1 << 11)
                h = e->xclient.data.l[4];
            else
                h = client->area.height;
            client->gravity = tmpg;

            {
                gint newx = x;
                gint newy = y;
                gint fw = w +
                     client->frame->size.left + client->frame->size.right;
                gint fh = h +
                     client->frame->size.top + client->frame->size.bottom;
                client_find_onscreen(client, &newx, &newy, fw, fh,
                                     client_normal(client));
                if (e->xclient.data.l[0] & 1 << 8)
                    x = newx;
                if (e->xclient.data.l[0] & 1 << 9)
                    y = newy;
            }

            client_configure(client, OB_CORNER_TOPLEFT,
                             x, y, w, h, FALSE, TRUE);

            client->gravity = oldg;
        }
        break;
    case PropertyNotify:
        /* validate cuz we query stuff off the client here */
        if (!client_validate(client)) break;
  
        /* compress changes to a single property into a single change */
        while (XCheckTypedWindowEvent(ob_display, client->window,
                                      e->type, &ce)) {
            Atom a, b;

            /* XXX: it would be nice to compress ALL changes to a property,
               not just changes in a row without other props between. */

            a = ce.xproperty.atom;
            b = e->xproperty.atom;

            if (a == b)
                continue;
            if ((a == prop_atoms.net_wm_name ||
                 a == prop_atoms.wm_name ||
                 a == prop_atoms.net_wm_icon_name ||
                 a == prop_atoms.wm_icon_name)
                &&
                (b == prop_atoms.net_wm_name ||
                 b == prop_atoms.wm_name ||
                 b == prop_atoms.net_wm_icon_name ||
                 b == prop_atoms.wm_icon_name)) {
                continue;
            }
            if (a == prop_atoms.net_wm_icon &&
                b == prop_atoms.net_wm_icon)
                continue;

            XPutBackEvent(ob_display, &ce);
            break;
        }

        msgtype = e->xproperty.atom;
        if (msgtype == XA_WM_NORMAL_HINTS) {
            client_update_normal_hints(client);
            /* normal hints can make a window non-resizable */
            client_setup_decor_and_functions(client);
        } else if (msgtype == XA_WM_HINTS) {
            client_update_wmhints(client);
        } else if (msgtype == XA_WM_TRANSIENT_FOR) {
            client_update_transient_for(client);
            client_get_type(client);
            /* type may have changed, so update the layer */
            client_calc_layer(client);
            client_setup_decor_and_functions(client);
        } else if (msgtype == prop_atoms.net_wm_name ||
                   msgtype == prop_atoms.wm_name ||
                   msgtype == prop_atoms.net_wm_icon_name ||
                   msgtype == prop_atoms.wm_icon_name) {
            client_update_title(client);
        } else if (msgtype == prop_atoms.wm_class) {
            client_update_class(client);
        } else if (msgtype == prop_atoms.wm_protocols) {
            client_update_protocols(client);
            client_setup_decor_and_functions(client);
        }
        else if (msgtype == prop_atoms.net_wm_strut) {
            client_update_strut(client);
        }
        else if (msgtype == prop_atoms.net_wm_icon) {
            client_update_icons(client);
        }
        else if (msgtype == prop_atoms.net_wm_user_time) {
            client_update_user_time(client);
        }
        else if (msgtype == prop_atoms.sm_client_id) {
            client_update_sm_client_id(client);
        }
    default:
        ;
#ifdef SHAPE
        if (extensions_shape && e->type == extensions_shape_event_basep) {
            client->shaped = ((XShapeEvent*)e)->shaped;
            frame_adjust_shape(client->frame);
        }
#endif
    }
}

static void event_handle_dock(ObDock *s, XEvent *e)
{
    switch (e->type) {
    case ButtonPress:
        if (e->xbutton.button == 1)
            stacking_raise(DOCK_AS_WINDOW(s));
        else if (e->xbutton.button == 2)
            stacking_lower(DOCK_AS_WINDOW(s));
        break;
    case EnterNotify:
        dock_hide(FALSE);
        break;
    case LeaveNotify:
        dock_hide(TRUE);
        break;
    }
}

static void event_handle_dockapp(ObDockApp *app, XEvent *e)
{
    switch (e->type) {
    case MotionNotify:
        dock_app_drag(app, &e->xmotion);
        break;
    case UnmapNotify:
        if (app->ignore_unmaps) {
            app->ignore_unmaps--;
            break;
        }
        dock_remove(app, TRUE);
        break;
    case DestroyNotify:
        dock_remove(app, FALSE);
        break;
    case ReparentNotify:
        dock_remove(app, FALSE);
        break;
    case ConfigureNotify:
        dock_app_configure(app, e->xconfigure.width, e->xconfigure.height);
        break;
    }
}

ObMenuFrame* find_active_menu()
{
    GList *it;
    ObMenuFrame *ret = NULL;

    for (it = menu_frame_visible; it; it = g_list_next(it)) {
        ret = it->data;
        if (ret->selected)
            break;
        ret = NULL;
    }
    return ret;
}

ObMenuFrame* find_active_or_last_menu()
{
    ObMenuFrame *ret = NULL;

    ret = find_active_menu();
    if (!ret && menu_frame_visible)
        ret = menu_frame_visible->data;
    return ret;
}

static void event_handle_menu(XEvent *ev)
{
    ObMenuFrame *f;
    ObMenuEntryFrame *e;

    switch (ev->type) {
    case ButtonRelease:
        if (menu_can_hide) {
            if ((e = menu_entry_frame_under(ev->xbutton.x_root,
                                            ev->xbutton.y_root)))
                menu_entry_frame_execute(e, ev->xbutton.state,
                                         ev->xbutton.time);
            else
                menu_frame_hide_all();
        }
        break;
    case EnterNotify:
        if ((e = g_hash_table_lookup(menu_frame_map, &ev->xcrossing.window))) {
            if (e->ignore_enters)
                --e->ignore_enters;
            else
                menu_frame_select(e->frame, e);
        }
        break;
    case LeaveNotify:
        if ((e = g_hash_table_lookup(menu_frame_map, &ev->xcrossing.window)) &&
            (f = find_active_menu()) && f->selected == e &&
            e->entry->type != OB_MENU_ENTRY_TYPE_SUBMENU)
        {
            menu_frame_select(e->frame, NULL);
        }
    case KeyPress:
        if (ev->xkey.keycode == ob_keycode(OB_KEY_ESCAPE))
            menu_frame_hide_all();
        else if (ev->xkey.keycode == ob_keycode(OB_KEY_RETURN)) {
            ObMenuFrame *f;
            if ((f = find_active_menu()))
                menu_entry_frame_execute(f->selected, ev->xkey.state,
                                         ev->xkey.time);
        } else if (ev->xkey.keycode == ob_keycode(OB_KEY_LEFT)) {
            ObMenuFrame *f;
            if ((f = find_active_or_last_menu()) && f->parent)
                menu_frame_select(f, NULL);
        } else if (ev->xkey.keycode == ob_keycode(OB_KEY_RIGHT)) {
            ObMenuFrame *f;
            if ((f = find_active_or_last_menu()) && f->child)
                menu_frame_select_next(f->child);
        } else if (ev->xkey.keycode == ob_keycode(OB_KEY_UP)) {
            ObMenuFrame *f;
            if ((f = find_active_or_last_menu()))
                menu_frame_select_previous(f);
        } else if (ev->xkey.keycode == ob_keycode(OB_KEY_DOWN)) {
            ObMenuFrame *f;
            if ((f = find_active_or_last_menu()))
                menu_frame_select_next(f);
        }
        break;
    }
}

static gboolean menu_hide_delay_func(gpointer data)
{
    menu_can_hide = TRUE;
    return FALSE; /* no repeat */
}

static void focus_delay_destroy(gpointer data)
{
    focus_delay_data.client = NULL;
    focus_delay_data.time = CurrentTime;
}

static gboolean focus_delay_func(gpointer data)
{
    Time old = event_curtime;
    event_curtime = focus_delay_data.time;
    if (focus_client != focus_delay_data.client) {
        if (client_focus(focus_delay_data.client) && config_focus_raise)
            client_raise(focus_delay_data.client);
    }
    event_curtime = old;
    return FALSE; /* no repeat */
}

static void focus_delay_client_dest(ObClient *client, gpointer data)
{
    if (focus_delay_data.client == client)
        ob_main_loop_timeout_remove(ob_main_loop, focus_delay_func);
}

static void event_client_dest(ObClient *client, gpointer data)
{
    if (client == focus_hilite)
        focus_hilite = NULL;
}

void event_halt_focus_delay()
{
    ob_main_loop_timeout_remove(ob_main_loop, focus_delay_func);
}

void event_ignore_queued_enters()
{
    GSList *saved = NULL, *it;
    XEvent *e;
                
    XSync(ob_display, FALSE);

    /* count the events */
    while (TRUE) {
        e = g_new(XEvent, 1);
        if (XCheckTypedEvent(ob_display, EnterNotify, e)) {
            ObWindow *win;
            
            win = g_hash_table_lookup(window_map, &e->xany.window);
            if (win && WINDOW_IS_CLIENT(win))
                ++ignore_enter_focus;
            
            saved = g_slist_append(saved, e);
        } else {
            g_free(e);
            break;
        }
    }
    /* put the events back */
    for (it = saved; it; it = g_slist_next(it)) {
        XPutBackEvent(ob_display, it->data);
        g_free(it->data);
    }
    g_slist_free(saved);
}

gboolean event_time_after(Time t1, Time t2)
{
    g_assert(t1 != CurrentTime);
    g_assert(t2 != CurrentTime);

    /*
      Timestamp values wrap around (after about 49.7 days). The server, given
      its current time is represented by timestamp T, always interprets
      timestamps from clients by treating half of the timestamp space as being
      later in time than T.
      - http://tronche.com/gui/x/xlib/input/pointer-grabbing.html
    */

    /* TIME_HALF is half of the number space of a Time type variable */
#define TIME_HALF (Time)(1 << (sizeof(Time)*8-1))

    if (t2 >= TIME_HALF)
        /* t2 is in the second half so t1 might wrap around and be smaller than
           t2 */
        return t1 >= t2 || t1 < (t2 + TIME_HALF);
    else
        /* t2 is in the first half so t1 has to come after it */
        return t1 >= t2 && t1 < (t2 + TIME_HALF);
}