contiki/ctk/ctk.c

/**
 * \defgroup ctk The CTK graphical user interface.
 * @{
 * The Contiki Toolkit (CTK) provides the graphical user interface for
 * the Contiki system.
 *
 */

/**
 * \file
 * The Contiki Toolkit CTK, the Contiki GUI.
 * \author Adam Dunkels <adam@dunkels.com>
 */

/*
 * Copyright (c) 2002-2003, Adam Dunkels.
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution. 
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.  
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
 *
 * This file is part of the Contiki operating system.
 *
 * $Id: ctk.c,v 1.45 2005/03/15 15:51:17 oliverschmidt Exp $
 *
 */

#include "ek.h"
#include "cc.h"

#include "ctk.h"
#include "ctk-draw.h"
#include "ctk-conf.h"
#include "ctk-mouse.h"

#include "timer.h"

#include <string.h>

static unsigned char height, width;

static unsigned char mode;

static struct ctk_window desktop_window;
static struct ctk_window *windows;
static struct ctk_window *dialog;

#if CTK_CONF_MENUS
static struct ctk_menus menus;
static struct ctk_menu *lastmenu;
static struct ctk_menu desktopmenu;
#endif /* CTK_CONF_MENUS */

#ifndef NULL
#define NULL (void *)0
#endif /* NULL */

#define REDRAW_NONE         0
#define REDRAW_ALL          1
#define REDRAW_FOCUS        2
#define REDRAW_WIDGETS      4
#define REDRAW_MENUS        8
#define REDRAW_MENUPART     16

#define MAX_REDRAWWIDGETS 4
static unsigned char redraw;
static struct ctk_widget *redraw_widgets[MAX_REDRAWWIDGETS];
static unsigned char redraw_widgetptr;
static unsigned char maxnitems;

static unsigned char iconx, icony;
#define ICONX_START  (width - 6)
#define ICONY_START  (height - 7)
#define ICONX_DELTA  -16
#define ICONY_DELTA  -5
#define ICONY_MAX    height
#define ICONY_MIN    0

#ifndef ctk_arch_isprint
unsigned char ctk_arch_isprint(char c);
#endif /* ctk_arch_isprint */

EK_POLLHANDLER(ctk_poll);
EK_EVENTHANDLER(ctk_eventhandler, ev, data);
EK_PROCESS(p, "CTK Contiki GUI", EK_PRIO_NORMAL, ctk_eventhandler,
	   ctk_poll, NULL);
/*static struct ek_proc p =
  {DISPATCHER_PROC("CTK Contiki GUI", ctk_idle, NULL, NULL)};*/
static ek_id_t ctkid;

/** @} */

/**
 * \addtogroup signals System signals
 * @{
 */
ek_event_t

  /**
   * Emitted for every key being pressed.
   *
   * The key is passed as signal data.*/
  ctk_signal_keypress,
  
  /** Emitted when a widget is activated (pressed). A pointer to the
      widget is passed as signal data. */
  ctk_signal_widget_activate,
  
  /** Same as ctk_signal_widget_activate. */
  ctk_signal_button_activate,

  /** Emitted when a widget is selected. A pointer to the widget is
      passed as signal data. */
  ctk_signal_widget_select,
  
  /** Same as ctk_signal_widget_select. */  
  ctk_signal_button_hover,

  /** Emitted when a hyperlink is activated. The signal is broadcast
      to all listeners. */
  ctk_signal_hyperlink_activate,

  /** Same as ctk_signal_widget_select. */  
  ctk_signal_hyperlink_hover,

  /** Emitted when a menu item is activated. The number of the menu
      item is passed as signal data. */
  ctk_signal_menu_activate,

  /** Emitted when a window is closed. A pointer to the window is
      passed as signal data. */
  ctk_signal_window_close,

  /** Emitted when the mouse pointer is moved. A NULL pointer is
      passed as signal data and it is up to the listening process to
      check the position of the mouse using the CTK mouse API.*/
  ctk_signal_pointer_move,

  /** Emitted when a mouse button is pressed. The button is passed as
      signal data to the listening process. */
  ctk_signal_pointer_button;

#if CTK_CONF_SCREENSAVER
/** Emitted when the user has been idle long enough for the
    screensaver to start. */
ek_event_t ctk_signal_screensaver_stop,
  /** Emitted when the user presses a key or moves the mouse when the
      screensaver is active. */
  ctk_signal_screensaver_start;
#endif /* CTK_CONF_SCREENSAVER */

/** @} */

/**
 * \addtogroup ctk
 * @{
 */

#if CTK_CONF_MOUSE_SUPPORT
unsigned short mouse_x, mouse_y, mouse_button;
#endif /* CTK_CONF_MOUSE_SUPPORT */

static unsigned short screensaver_timer = 0;
unsigned short ctk_screensaver_timeout = (5*60);
/*static ek_clock_t start, current;*/
static struct timer timer;

#if CTK_CONF_MENUS
/*-----------------------------------------------------------------------------------*/
/**
 * \internal Creates the Desktop menu.
 *
 * Creates the leftmost menu, "Desktop". Since the desktop menu
 * contains the list of all open windows, this function will be called
 * whenever a window is opened or closed.
 */
/*-----------------------------------------------------------------------------------*/
static void
make_desktopmenu(void)
{
  struct ctk_window *w;
  
  desktopmenu.nitems = 0;
  
  if(windows == NULL) {
    ctk_menuitem_add(&desktopmenu, "(No windows)");
  } else {
    for(w = windows; w != NULL; w = w->next) {
      ctk_menuitem_add(&desktopmenu, w->title);
    }
  }
}
#endif /* CTK_CONF_MENUS */
/*-----------------------------------------------------------------------------------*/
static void
arrange_icons(void)
{
  struct ctk_widget *icon;

  iconx = ICONX_START;
  icony = ICONY_START;
  
  for(icon = desktop_window.active; icon != NULL; icon = icon->next) {
    
    icon->x = iconx;
    icon->y = icony;
    
    icony += ICONY_DELTA;
    if(icony >= ICONY_MAX ||
       icony < ICONY_MIN) {
      icony = ICONY_START;
      iconx += ICONX_DELTA;
    }
  }
}
/*-----------------------------------------------------------------------------------*/  
void
ctk_restore(void)
{
  ctk_draw_init();

  height = ctk_draw_height();
  width = ctk_draw_width();

  arrange_icons();

  redraw = REDRAW_ALL;
}
/*-----------------------------------------------------------------------------------*/
/**
 * Initializes the Contiki Toolkit.
 *
 * This function must be called before any other CTK function, but
 * after the inizialitation of the dispatcher module.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_init(void)
{
  ctkid = ek_start(&p);
  
  windows = NULL;
  dialog = NULL;

#if CTK_CONF_MENUS 
  ctk_menu_new(&desktopmenu, "Desktop");
  make_desktopmenu();
  menus.menus = menus.desktopmenu = &desktopmenu;
#endif /* CTK_CONF_MENUS */

#if CTK_CONF_MOUSE_SUPPORT
  ctk_mouse_init();
  ctk_mouse_show();
#endif /* CTK_CONF_MOUSE_SUPPORT */
  
  ctk_draw_init();

  height = ctk_draw_height();
  width = ctk_draw_width();
  
  desktop_window.active = NULL;
  desktop_window.owner = ctkid;
  
  ctk_signal_keypress = ek_alloc_event();
  
  ctk_signal_button_activate =
    ctk_signal_widget_activate = ek_alloc_event();
  
  ctk_signal_button_hover =
    ctk_signal_hyperlink_hover =
    ctk_signal_widget_select = ek_alloc_event();
  
  ctk_signal_hyperlink_activate = ek_alloc_event();

  ctk_signal_menu_activate = ek_alloc_event();
  ctk_signal_window_close = ek_alloc_event();

  ctk_signal_pointer_move = ek_alloc_event();
  ctk_signal_pointer_button = ek_alloc_event();


#if CTK_CONF_SCREENSAVER
  ctk_signal_screensaver_start = ek_alloc_event();
  ctk_signal_screensaver_stop = ek_alloc_event();
#endif /* CTK_CONF_SCREENSAVER */
    

  mode = CTK_MODE_NORMAL;

  iconx = ICONX_START;
  icony = ICONY_START;

  redraw = REDRAW_ALL;

  /*  start = ek_clock();*/
  timer_set(&timer, CLOCK_SECOND);
}

/**
 * \addtogroup ctkappfunc
 * @{
 */

/*-----------------------------------------------------------------------------------*/
/**
 * Sets the current CTK mode.
 *
 * The CTK mode can be either CTK_MODE_NORMAL, CTK_MODE_SCREENSAVER or
 * CTK_MODE_EXTERNAL. CTK_MODE_NORMAL is the normal mode, in which
 * keypresses and mouse pointer movements are processed and the screen
 * is redrawn. In CTK_MODE_SCREENSAVER, no screen redraws are
 * performed and the first key press or pointer movement will cause
 * the ctk_signal_screensaver_stop to be emitted. In the
 * CTK_MODE_EXTERNAL mode, key presses and pointer movements are
 * ignored and no screen redraws are made.
 *
 * \param m The mode. 
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_mode_set(unsigned char m) {
  mode = m;
}
/*-----------------------------------------------------------------------------------*/
/**
 * Retrieves the current CTK mode.
 *
 * \return The current CTK mode.
 */
/*-----------------------------------------------------------------------------------*/
unsigned char
ctk_mode_get(void) {
  return mode;
}
/*-----------------------------------------------------------------------------------*/
/**
 * Add an icon to the desktop.
 *
 * \param icon The icon to be added.
 *
 * \param id The process ID of the process that owns the icon.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_icon_add(CC_REGISTER_ARG struct ctk_widget *icon, ek_id_t id)
{
#if CTK_CONF_ICONS 
  /*  icon->x = iconx;
  icon->y = icony;
  icon->widget.icon.owner = id;

  icony += ICONY_DELTA;
  if(icony >= ICONY_MAX) {
    icony = ICONY_START;
    iconx += ICONX_DELTA;
    }*/
  icon->widget.icon.owner = id;
  ctk_widget_add(&desktop_window, icon);
  arrange_icons();
#endif /* CTK_CONF_ICONS */
}
/*-----------------------------------------------------------------------------------*/
/**
 * Open a dialog box.
 *
 * \param d The dialog to be opened.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_dialog_open(struct ctk_window *d)
{
  dialog = d;
  redraw |= REDRAW_FOCUS;
} 
/*-----------------------------------------------------------------------------------*/
/**
 * Close the dialog box, if one is open.
 *
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_dialog_close(void)
{
  dialog = NULL;
  redraw |= REDRAW_ALL;
}
/*-----------------------------------------------------------------------------------*/
/**
 * Open a window, or bring window to front if already open.
 *
 * \param w The window to be opened.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_window_open(CC_REGISTER_ARG struct ctk_window *w)
{
  struct ctk_window *w2;
  
  /* Check if already open. */
  for(w2 = windows; w2 != w && w2 != NULL; w2 = w2->next);
  if(w2 == NULL) {
   /* Not open, so we add it at the head of the list of open
       windows. */
    w->next = windows;
    if(windows != NULL) {
      windows->prev = w;
    }
    windows = w;
    w->prev = NULL;
  } else {
    /* Window already open, so we move it to the front of the windows
       list. */
    if(w != windows) {
      if(w->next != NULL) {
	w->next->prev = w->prev;
      }
      if(w->prev != NULL) {
	w->prev->next = w->next;
      }
      w->next = windows;
      windows->prev = w;
      windows = w;
      w->prev = NULL;
    }
  }
  
#if CTK_CONF_MENUS
  /* Recreate the Desktop menu's window entries.*/
  make_desktopmenu();
#endif /* CTK_CONF_MENUS */

  redraw |= REDRAW_ALL;
}
/*-----------------------------------------------------------------------------------*/
/**
 * Close a window if it is open.
 *
 * If the window is not open, this function does nothing.
 *
 * \param w The window to be closed.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_window_close(struct ctk_window *w)
{
  static struct ctk_window *w2;

  if(w == NULL) {
    return;
  }
  
  /* Check if the window to be closed is the first window on the
     list. */
  if(w == windows) {
    windows = w->next;
    if(windows != NULL) {
      windows->prev = NULL;
    }
    w->next = w->prev = NULL;
  } else {
    /* Otherwise we step through the list until we find the window
       before the one to be closed. We then redirect its ->next
       pointer and its ->next->prev. */
    for(w2 = windows; w2 != NULL && w2->next != w; w2 = w2->next);

    if(w2 == NULL) {
      /* The window wasn't open, so there is nothing more for us to
	 do. */
      return;
    }

    if(w->next != NULL) {
      w->next->prev = w->prev;
    }
    w2->next = w->next;
    
    w->next = w->prev = NULL;
  }
  
#if CTK_CONF_MENUS
  /* Recreate the Desktop menu's window entries.*/
  make_desktopmenu();
#endif /* CTK_CONF_MENUS */
  redraw |= REDRAW_ALL;
}
/*-----------------------------------------------------------------------------------*/
/**
 * \internal Create the move and close buttons on the window titlebar.
 */
/*-----------------------------------------------------------------------------------*/
static void 
make_windowbuttons(CC_REGISTER_ARG struct ctk_window *window)
{
  unsigned char placement;

  if(ctk_draw_windowtitle_height >= 2) {
    placement = -1 - ctk_draw_windowtitle_height/2;
  } else {
    placement = -1;
  }
#if CTK_CONF_WINDOWMOVE
  CTK_BUTTON_NEW(&window->titlebutton, 0, placement,
		 window->titlelen, window->title);
#else
  CTK_LABEL_NEW(&window->titlebutton, 0, placement,
		window->titlelen, 1, window->title);
#endif /* CTK_CONF_WINDOWMOVE */
  CTK_WIDGET_ADD(window, &window->titlebutton);


#if CTK_CONF_WINDOWCLOSE
  CTK_BUTTON_NEW(&window->closebutton, window->w - 3, placement,
		 1, "x");
#else
  CTK_LABEL_NEW(&window->closebutton, window->w - 4, placement,
		3, 1, "   ");
#endif /* CTK_CONF_WINDOWCLOSE */  
  CTK_WIDGET_ADD(window, &window->closebutton);
}
/*-----------------------------------------------------------------------------------*/
/**
 * Remove all widgets from a window.
 *
 * \param w The window to be cleared.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_window_clear(struct ctk_window *w)
{
  w->active = w->inactive = w->focused = NULL;
  
  make_windowbuttons(w);
}
/*-----------------------------------------------------------------------------------*/
/**
 * Add a menu to the menu bar.
 *
 * \param menu The menu to be added.
 *
 * \note Do not call this function multiple times for the same menu,
 * as no check is made to see if the menu already is in the menu bar.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_menu_add(struct ctk_menu *menu)
{
#if CTK_CONF_MENUS
  struct ctk_menu *m;

  if(lastmenu == NULL) {
    lastmenu = menu;
  }
    
  for(m = menus.menus; m->next != NULL; m = m->next) {
    if(m == menu) {
      return;
    }
  }
  m->next = menu;
  menu->next = NULL;

  redraw |= REDRAW_MENUPART;
#endif /* CTK_CONF_MENUS */
}
/*-----------------------------------------------------------------------------------*/
/**
 * Remove a menu from the menu bar.
 *
 * \param menu The menu to be removed.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_menu_remove(struct ctk_menu *menu)
{
#if CTK_CONF_MENUS
  struct ctk_menu *m;

  for(m = menus.menus; m->next != NULL; m = m->next) {
    if(m->next == menu) {
      m->next = menu->next;
      if(menu == lastmenu) {
	lastmenu = NULL;
      }
      redraw |= REDRAW_MENUPART;      
      return;
    }
  }
#endif /* CTK_CONF_MENUS */
}
/*-----------------------------------------------------------------------------------*/
/**
 * \internal Redraws everything on the screen within the clip
 * interval.
 *
 * \param clipy1 The upper bound of the clip interval
 * \param clipy2 The lower bound of the clip interval 
 */
/*-----------------------------------------------------------------------------------*/
static void CC_FASTCALL 
do_redraw_all(unsigned char clipy1, unsigned char clipy2)
{
  struct ctk_window *w;
  static struct ctk_widget *widget;
  unsigned char focus;

  if(mode != CTK_MODE_NORMAL &&
     mode != CTK_MODE_WINDOWMOVE) {
    return;
  }
  
  ctk_draw_clear(clipy1, clipy2);

  /* Draw widgets in root window */
  for(widget = desktop_window.active;
      widget != NULL; widget = widget->next) {
    ctk_draw_widget(widget, windows != NULL? 0: CTK_FOCUS_WINDOW, clipy1, clipy2);
  }
  
  /* Draw windows */
  if(windows != NULL) {
    /* Find the last window.*/
    for(w = windows; w->next != NULL; w = w->next);

    /* Draw the windows from back to front. */
    for(; w != windows; w = w->prev) {
      ctk_draw_clear_window(w, 0, clipy1, clipy2);
      ctk_draw_window(w, 0, clipy1, clipy2, 1);
    }

    /* Draw focused window */
    focus = mode == CTK_MODE_WINDOWMOVE?
	    CTK_FOCUS_WIDGET|CTK_FOCUS_WINDOW:
	    CTK_FOCUS_WINDOW;
    ctk_draw_clear_window(windows, focus, clipy1, clipy2);
    ctk_draw_window(windows, focus, clipy1, clipy2, 1);
  }

  /* Draw dialog (if any) */
  if(dialog != NULL) {
    ctk_draw_dialog(dialog);
  }

#if CTK_CONF_MENUS
  ctk_draw_menus(&menus);
#endif /* CTK_CONF_MENUS */
}
/*-----------------------------------------------------------------------------------*/
/**
 * Redraw the entire desktop.
 *
 * \param d The desktop to be redrawn.
 *
 * \note Currently the parameter d is not used, but must be set to
 * NULL.
 *
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_desktop_redraw(struct ctk_desktop *d)
{
  if(EK_CURRENT() == &p) {
    if(mode == CTK_MODE_NORMAL ||
       mode == CTK_MODE_WINDOWMOVE) {
      do_redraw_all(1, height);
    }
  } else {
    redraw |= REDRAW_ALL;
  }
}
/*-----------------------------------------------------------------------------------*/
/**
 * Redraw a window.
 *
 * This function redraws the window, but only if it is the foremost
 * one on the desktop.
 *
 * \param w The window to be redrawn.
 */
/*-----------------------------------------------------------------------------------*/
void 
ctk_window_redraw(struct ctk_window *w)
{
  /* Only redraw the window if it is a dialog or if it is the foremost
     window. */
  if(mode != CTK_MODE_NORMAL) {
    return;
  }
  
  if(w == dialog) {
    ctk_draw_dialog(w);
  } else if(dialog == NULL &&
#if CTK_CONF_MENUS
	    menus.open == NULL &&
#endif /* CTK_CONF_MENUS */		    
	    windows == w) {
    ctk_draw_window(w, CTK_FOCUS_WINDOW,
		    0, height, 0);
  }  
}
/*-----------------------------------------------------------------------------------*/
/**
 * \internal Creates a new window.
 *
 * \param window The window to be created.
 * \param w The width of the window.
 * \param h The height of the window.
 * \param title The title of the window.
 */
/*-----------------------------------------------------------------------------------*/
static void 
window_new(CC_REGISTER_ARG struct ctk_window *window,
	   unsigned char w, unsigned char h,
	   char *title)
{
  
  if(w >= width - 2) {
    window->x = 0;
  } else {
    window->x = (width - w - 2) / 2;
  }
  if(h >= height - 2 - ctk_draw_windowtitle_height) {
    window->y = 0;
  } else {
    window->y = (height - h - 2 - ctk_draw_windowtitle_height) / 2;
  }

  window->w = w;
  window->h = h;
  window->title = title;
  if(title != NULL) {
    window->titlelen = strlen(title);
  } else {
    window->titlelen = 0;
  }
  window->next = window->prev = NULL;
  /*  window->owner = DISPATCHER_CURRENT();*/
  window->owner = EK_PROC_ID(EK_CURRENT());
  window->active = window->inactive = window->focused = NULL;
}
/*-----------------------------------------------------------------------------------*/
/**
 * Create a new window.
 *
 * Creates a new window. The memory for the window structure must
 * already be allocated by the caller, and is usually done with a
 * static declaration.
 *
 * This function sets up the internal structure of the ctk_window
 * struct and creates the move and close buttons, but it does not open
 * the window. The window must be explicitly opened by calling the
 * ctk_window_open() function.
 *
 * \param window The window to be created.
 * \param w The width of the new window.
 * \param h The height of the new window.
 * \param title The title of the new window.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_window_new(struct ctk_window *window,
	       unsigned char w, unsigned char h,
	       char *title)
{
  window_new(window, w, h, title);

  make_windowbuttons(window);  
}
/*-----------------------------------------------------------------------------------*/
/**
 * Creates a new dialog.
 *
 * This function only sets up the internal structure of the ctk_window
 * struct but does not open the dialog. The dialog must be explicitly
 * opened by calling the ctk_dialog_open() function.
 *
 * \param dialog The dialog to be created.
 * \param w The width of the dialog.
 * \param h The height of the dialog.
 */
/*-----------------------------------------------------------------------------------*/
void
ctk_dialog_new(CC_REGISTER_ARG struct ctk_window *dialog,
	       unsigned char w, unsigned char h)
{
  window_new(dialog, w, h, NULL);
}
/*-----------------------------------------------------------------------------------*/
/**
 * Creates a new menu.
 *
 * This function sets up the internal structure of the menu, but does
 * not add it to the menubar. Use the function ctk_menu_add() for that
 * purpose.
 *
 * \param menu The menu to be created.
 * \param title The title of the menu.
 */
/*-----------------------------------------------------------------------------------*/
void 
ctk_menu_new(CC_REGISTER_ARG struct ctk_menu *menu,
	     char *title)
{
#if CTK_CONF_MENUS
  menu->next = NULL;
  menu->title = title;
  menu->titlelen = strlen(title);
  menu->active = 0;
  menu->nitems = 0;
#endif /* CTK_CONF_MENUS */
}
/*-----------------------------------------------------------------------------------*/
/**
 * Adds a menu item to a menu.
 *
 * In CTK, each menu item is identified by a number which is unique
 * within each menu. When a menu item is selected, a
 * ctk_menuitem_activated signal is emitted and the menu item number
 * is passed as signal data with the signal.
 *
 * \param menu The menu to which the menu item should be added.
 * \param name The name of the menu item.
 * \return The number of the menu item.
 */
/*-----------------------------------------------------------------------------------*/
unsigned char
ctk_menuitem_add(CC_REGISTER_ARG struct ctk_menu *menu,
		 char *name)
{
#if CTK_CONF_MENUS
  if(menu->nitems == CTK_CONF_MAXMENUITEMS) {
    return 0;
  }
  menu->items[menu->nitems].title = name;
  menu->items[menu->nitems].titlelen = strlen(name); 
  return menu->nitems++;
#else
  return 0;
#endif /* CTK_CONF_MENUS */
}
/*-----------------------------------------------------------------------------------*/
/**
 * \internal Adds a widget to the list of widgets that should be
 * redrawn.
 *
 * \param w The widget that should be redrawn.
 */
/*-----------------------------------------------------------------------------------*/
static void CC_FASTCALL 
add_redrawwidget(struct ctk_widget *w)
{
  static unsigned char i;
  
  if(redraw_widgetptr == MAX_REDRAWWIDGETS) {
    redraw |= REDRAW_FOCUS;
  } else {
    redraw |= REDRAW_WIDGETS;
    /* Check if it is in the queue already. If so, we don't add it
       again. */
    for(i = 0; i < redraw_widgetptr; ++i) {
      if(redraw_widgets[i] == w) {
	return;
      }
    }
    redraw_widgets[redraw_widgetptr++] = w;
  }
}
/*-----------------------------------------------------------------------------------*/
/**
 * \internal Checks if a widget redrawn and adds it to the list of
 * widgets to be redrawn.
 *
 * A widget can be redrawn only if the current CTK mode is
 * CTK_MODE_NORMAL, if no menu is open, and the widget is in the
 * foremost window.
 *
 * \param widget The widget that should be redrawn.
 */
/*-----------------------------------------------------------------------------------*/
static void
widget_redraw(struct ctk_widget *widget)
{
  struct ctk_window *window;

  if(mode != CTK_MODE_NORMAL || widget == NULL) {
    return;
  }

  /* Only redraw widgets that are in the foremost window. If we would
     allow redrawing widgets in non-focused windows, we would have to
     redraw all the windows that cover the non-focused window as well,
     which would lead to flickering.

     Also, we avoid drawing any widgets when the menus are active.
    */
    
#if CTK_CONF_MENUS
  if(menus.open == NULL)
#endif /* CTK_CONF_MENUS */
    {
      window = widget->window;
      if(window == dialog) {
	ctk_draw_widget(widget, CTK_FOCUS_DIALOG, 0, height);
      } else if(dialog == NULL &&
		(window == windows ||
		 window == &desktop_window)) {
	ctk_draw_widget(widget, CTK_FOCUS_WINDOW, 0, height);
      }
    }
}
/*-----------------------------------------------------------------------------------*/
/**
 * Redraws a widget.
 *
 * This function will set a flag which causes the widget to be redrawn
 * next time the CTK process is scheduled.
 *
 * \param widget The widget that is to be redrawn.
 *
 * \note This function should usually not be called directly since it
 * requires typecasting of the widget parameter. The wrapper macro
 * CTK_WIDGET_REDRAW() does the required typecast and should be used
 * instead.
 */
/*-----------------------------------------------------------------------------------*/
void 
ctk_widget_redraw(struct ctk_widget *widget)
{
  if(mode != CTK_MODE_NORMAL || widget == NULL) {
    return;
  }

  /* Since this function isn't called by CTK itself, we only queue the
     redraw request. */
  add_redrawwidget(widget);
}
/*-----------------------------------------------------------------------------------*/
/**
 * Adds a widget to a window.
 *
 * This function adds a widget to a window. The order of which the
 * widgets are added is important, as it sets the order to which
 * widgets are cycled with the widget selection keys.
 *
 * \param window The window to which the widhet should be added.
 * \param widget The widget to be added.
 */
/*-----------------------------------------------------------------------------------*/
void CC_FASTCALL
ctk_widget_add(CC_REGISTER_ARG struct ctk_window *window,
	       CC_REGISTER_ARG struct ctk_widget *widget)
{  
  if(widget->type == CTK_WIDGET_LABEL ||
     widget->type == CTK_WIDGET_SEPARATOR) {
    widget->next = window->inactive;
    window->inactive = widget;
    widget->window = window;
  } else {
    widget->next = window->active;
    window->active = widget;
    widget->window = window;
    /*    if(window->focused == NULL) {
      window->focused = widget;
      }*/
  }
}
/*-----------------------------------------------------------------------------------*/
/**
 * Gets the width of the desktop.
 *
 * \param d The desktop.
 * \return The width of the desktop, in characters.
 *
 * \note The d parameter is currently unused and must be set to NULL.
 */
/*-----------------------------------------------------------------------------------*/
unsigned char
ctk_desktop_width(struct ctk_desktop *d)
{
  return ctk_draw_width();
}
/*-----------------------------------------------------------------------------------*/
/**
 * Gets the height of the desktop.
 *
 * \param d The desktop.
 * \return The height of the desktop, in characters.
 *
 * \note The d parameter is currently unused and must be set to NULL.
 */
/*-----------------------------------------------------------------------------------*/
unsigned char
ctk_desktop_height(struct ctk_desktop *d)
{
  return ctk_draw_height();
}
/*-----------------------------------------------------------------------------------*/
/**
 * \internal Selects a widget in the window of the widget.
 *
 * \param focus The widget to be focused.
 */
/*-----------------------------------------------------------------------------------*/
static void CC_FASTCALL 
select_widget(struct ctk_widget *focus)
{
  struct ctk_window *window;

  window = focus->window;
  
  if(focus != window->focused) {
    window->focused = focus;
    /* The operation changed the focus, so we emit a "hover" signal
       for those widgets that support it. */
    
    if(window->focused->type == CTK_WIDGET_HYPERLINK) {    
      ek_post(window->owner, ctk_signal_hyperlink_hover, window->focused);
    } else if(window->focused->type == CTK_WIDGET_BUTTON) {    
      ek_post(window->owner, ctk_signal_button_hover, window->focused);      
    } 
    
    add_redrawwidget(window->focused);

    ek_post(focus->window->owner, ctk_signal_widget_select, focus);

  }

}
/*-----------------------------------------------------------------------------------*/
#define UP 0
#define DOWN 1
#define LEFT 2
#define RIGHT 3
static void CC_FASTCALL 
switch_focus_widget(unsigned char direction)
{
  register struct ctk_window *window;
  register struct ctk_widget *focus;
  struct ctk_widget *widget;
  
  
  if(dialog != NULL) {
    window = dialog;
  } else {
    window = windows;
  }

  /* If there are no windows open, we move focus around between the
     icons on the root window instead. */
  if(window == NULL) {
    window = &desktop_window;
  }
 
  focus = window->focused;
  if(focus == NULL) {
    focus = window->active;
    if(focus == NULL) {
      return;
    }
  }
  add_redrawwidget(focus);
  
  if((direction & 1) == 0) {
    /* Move focus "up" */
    focus = focus->next;
  } else {
    /* Move focus "down" */
    for(widget = window->active;
	widget != NULL; widget = widget->next) {
	if(widget->next == focus) {
	  break;
	}      
    }    
    focus = widget;
    if(focus == NULL) {
      if(window->active != NULL) {	
	for(focus = window->active;
	    focus->next != NULL; focus = focus->next);
      }
    }
  }
  if(focus == NULL) {
    focus = window->active;
  }

  select_widget(focus);
}
/*-----------------------------------------------------------------------------------*/
#if CTK_CONF_MENUS
static void 
switch_open_menu(unsigned char rightleft)
{
  struct ctk_menu *menu;
  
  if(rightleft == 0) {
    /* Move right */
    for(menu = menus.menus; menu != NULL; menu = menu->next) {
      if(menu->next == menus.open) {
	break;
      }
    }
    lastmenu = menus.open;
    menus.open = menu;
    if(menus.open == NULL) {
      for(menu = menus.menus;
	  menu->next != NULL; menu = menu->next);
      menus.open = menu;
    }
  } else {
    /* Move to left */
    lastmenu = menus.open;
    menus.open = menus.open->next;
    if(menus.open == NULL) {
      menus.open = menus.menus;
    }
  }

  menus.open->active = 0;

  /*  if(menus.open->nitems > maxnitems) {
    maxnitems = menus.open->nitems;
    }*/

  /*  ctk_desktop_redraw();*/
}
/*-----------------------------------------------------------------------------------*/
static void 
switch_menu_item(unsigned char updown)
{
  register struct ctk_menu *m;

  m = menus.open;
  
  if(updown == 0) {
    /* Move up */
    if(m->active == 0) {
      m->active = m->nitems - 1;
    } else {
      --m->active;
      if(m->items[m->active].title[0] == '-') {
	--m->active;
      }
    }
  } else {
    /* Move down */
    if(m->active >= m->nitems - 1) {
      m->active = 0;
    } else {      
      ++m->active;
      if(m->items[m->active].title[0] == '-') {
	++m->active;
      }
    }
  }
  
}
#endif /* CTK_CONF_MENUS */
/*-----------------------------------------------------------------------------------*/
static unsigned char CC_FASTCALL 
activate(CC_REGISTER_ARG struct ctk_widget *w)
{
  static unsigned char len;
  
  if(w->type == CTK_WIDGET_BUTTON) {
    if(w == (struct ctk_widget *)&windows->closebutton) {
#if CTK_CONF_WINDOWCLOSE
      ek_post(w->window->owner, ctk_signal_window_close, windows);
      ctk_window_close(windows);
      return REDRAW_ALL;
#endif /* CTK_CONF_WINDOWCLOSE */
    } else if(w == (struct ctk_widget *)&windows->titlebutton) {
#if CTK_CONF_WINDOWMOVE
      mode = CTK_MODE_WINDOWMOVE;
      return REDRAW_ALL;
#endif /* CTK_CONF_WINDOWMOVE */
    } else {
      ek_post(w->window->owner, ctk_signal_widget_activate, w);
    }
#if CTK_CONF_ICONS
  } else if(w->type == CTK_WIDGET_ICON) {
    if(w->widget.icon.owner != EK_ID_NONE) {
      ek_post(w->widget.icon.owner, ctk_signal_widget_activate, w);
    } else {
      ek_post(w->window->owner, ctk_signal_widget_activate, w);
    }
#endif /* CTK_CONF_ICONS */
  } else if(w->type == CTK_WIDGET_HYPERLINK) {    
    ek_post(EK_BROADCAST, ctk_signal_hyperlink_activate, w);
  } else if(w->type == CTK_WIDGET_TEXTENTRY) {
    if(w->widget.textentry.state == CTK_TEXTENTRY_NORMAL) {      
      w->widget.textentry.state = CTK_TEXTENTRY_EDIT;
      len = strlen(w->widget.textentry.text);
      if(w->widget.textentry.xpos > len) {
	w->widget.textentry.xpos = len;
      }
    } else if(w->widget.textentry.state == CTK_TEXTENTRY_EDIT) {
      w->widget.textentry.state = CTK_TEXTENTRY_NORMAL;
      ek_post(w->window->owner, ctk_signal_widget_activate, w);
    }
    add_redrawwidget(w);
    return REDRAW_WIDGETS;
  } else {
    ek_post(w->window->owner, ctk_signal_widget_activate, w);
  }
  return REDRAW_NONE;
}
/*-----------------------------------------------------------------------------------*/
static void CC_FASTCALL 
textentry_input(ctk_arch_key_t c,
		CC_REGISTER_ARG struct ctk_textentry *t)
{
  register char *cptr, *cptr2;
  static unsigned char len, txpos, typos, tlen;

  txpos = t->xpos;
  typos = t->ypos;
  tlen = t->len;

  cptr = &t->text[txpos + typos * tlen];
      
  switch(c) {
  case CH_CURS_LEFT:
    if(txpos > 0) {
      --txpos;
    }
    break;
    
  case CH_CURS_RIGHT:    
    if(txpos < tlen - 1 && *cptr != 0) {
      ++txpos;
    }
    break;

  case CH_CURS_UP:
    txpos = 0;
    break;
    
  case CH_CURS_DOWN:
    txpos = strlen(t->text);
    if(txpos == tlen) {
      --txpos;
    }
    break;
    
  case CH_ENTER:
    /*    t->state = CTK_TEXTENTRY_NORMAL;*/
    activate((struct ctk_widget *)t);
    switch_focus_widget(DOWN);
    break;
    
  case CTK_CONF_WIDGETDOWN_KEY:
    t->state = CTK_TEXTENTRY_NORMAL;
    switch_focus_widget(DOWN);
    break;
  case CTK_CONF_WIDGETUP_KEY:
    t->state = CTK_TEXTENTRY_NORMAL;
    switch_focus_widget(UP);
    break;
    
  default:
    len = tlen - txpos;
    if(c == CH_DEL) {
      if(len == 1 && *cptr != 0) {
	*cptr = 0;
      } else {
        if(txpos > 0) {
	  --txpos;
	  strcpy(cptr - 1, cptr);
	}
      }
    } else {
      if(ctk_arch_isprint(c)) {
	if(len > 1) {
	  cptr2 = cptr + len - 1;
	  while(cptr2 > cptr) {
	    *cptr2 = *(cptr2 - 1);
	    --cptr2;
	  }
	  ++txpos;
	}
	*cptr = c;
      }
    }
    break;
  }

  t->xpos = txpos;
  t->ypos = typos;
}
/*-----------------------------------------------------------------------------------*/
#if CTK_CONF_MENUS
static unsigned char 
activate_menu(void)
{
  struct ctk_window *w;
  
  lastmenu = menus.open;
  if(menus.open == &desktopmenu) {
    for(w = windows; w != NULL; w = w->next) {
      if(w->title == desktopmenu.items[desktopmenu.active].title) {
	ctk_window_open(w);
	menus.open = NULL;
	return REDRAW_ALL;
      }
    }
  } else {
    ek_post(EK_BROADCAST, ctk_signal_menu_activate, menus.open);
  }
  menus.open = NULL;
  return REDRAW_MENUPART;
}
/*-----------------------------------------------------------------------------------*/
static unsigned char 
menus_input(ctk_arch_key_t c)
{

  if(menus.open->nitems > maxnitems) {
    maxnitems = menus.open->nitems;
  }

  
  switch(c) {
  case CH_CURS_RIGHT:
    switch_open_menu(1);
	
    return REDRAW_MENUPART;

  case CH_CURS_DOWN:
    switch_menu_item(1);
    return REDRAW_MENUS;

  case CH_CURS_LEFT:
    switch_open_menu(0);
    return REDRAW_MENUPART;

  case CH_CURS_UP:
    switch_menu_item(0);
    return REDRAW_MENUS;
    
  case CH_ENTER:
    return activate_menu();

  case CTK_CONF_MENU_KEY:
    lastmenu = menus.open;
    menus.open = NULL;
    return REDRAW_MENUPART;
  }

  return REDRAW_NONE;
}
#endif /* CTK_CONF_MENUS */
/*-----------------------------------------------------------------------------------*/
static void
handle_timer(void)
{
  if(mode == CTK_MODE_NORMAL) {
    ++screensaver_timer;
    if(screensaver_timer >= ctk_screensaver_timeout) {
#if CTK_CONF_SCREENSAVER
      ek_post(EK_BROADCAST, ctk_signal_screensaver_start, NULL);
#ifdef CTK_SCREENSAVER_INIT
      CTK_SCREENSAVER_INIT();
#endif /* CTK_SCREENSAVER_INIT */

#endif /* CTK_CONF_SCREENSAVER */
      screensaver_timer = 0;
    }
  }  
}
/*-----------------------------------------------------------------------------------*/
static void
unfocus_widget(CC_REGISTER_ARG struct ctk_widget *w)
{
  if(w != NULL) {
    redraw |= REDRAW_WIDGETS;
    add_redrawwidget(w);
    if(CTK_WIDGET_TYPE(w) == CTK_WIDGET_TEXTENTRY) {
      ((struct ctk_textentry *)w)->state =
	CTK_TEXTENTRY_NORMAL;
    }
    w->window->focused = NULL;
  }
}
/*-----------------------------------------------------------------------------------*/
EK_POLLHANDLER(ctk_poll)
{
  static ctk_arch_key_t c;
  static unsigned char i;
  register struct ctk_window *window;
  register struct ctk_widget *widget;
  register struct ctk_widget **widgetptr;
#if CTK_CONF_MOUSE_SUPPORT 
  static unsigned char mxc, myc, mouse_button_changed, mouse_moved,
    mouse_clicked;
  static unsigned char menux;
  register struct ctk_menu *menu;

#endif /* CTK_CONF_MOUSE_SUPPORT */


  /*  current = ek_clock();
  
  if((current - start) >= CLK_TCK) {
    timer();
    start = current;
    } */
  if(timer_expired(&timer)) {
    timer_reset(&timer);
    handle_timer();
  }

#if CTK_CONF_MENUS
  if(menus.open != NULL) {
    maxnitems = menus.open->nitems;
  } else {
    maxnitems = 0;
  }
#endif /* CTK_CONF_MENUS */

#if CTK_CONF_MOUSE_SUPPORT
  mouse_button_changed = mouse_moved = mouse_clicked = 0;

  /* See if there is any change in the buttons. */
  if(ctk_mouse_button() != mouse_button) {
    mouse_button = ctk_mouse_button();
    mouse_button_changed = 1;
    if(mouse_button == 0) {
      mouse_clicked = 1;
    }
  }
  
  /* Check if the mouse pointer has moved. */
  if(ctk_mouse_x() != mouse_x ||
     ctk_mouse_y() != mouse_y) {
    mouse_x = ctk_mouse_x();
    mouse_y = ctk_mouse_y();
    mouse_moved = 1;
  }

  mxc = ctk_mouse_xtoc(mouse_x);
  myc = ctk_mouse_ytoc(mouse_y); 
#endif /* CTK_CONF_MOUSE_SUPPORT */


#if CTK_CONF_SCREENSAVER
  if(mode == CTK_MODE_SCREENSAVER) {
    if(ctk_arch_keyavail()
#if CTK_CONF_MOUSE_SUPPORT
       || mouse_moved || mouse_button_changed
#endif /* CTK_CONF_MOUSE_SUPPORT */
       ) {      
      ek_post(EK_BROADCAST, ctk_signal_screensaver_stop, NULL);
      mode = CTK_MODE_NORMAL;
    }
  } else
#endif /* CTK_CONF_SCREENSAVER */
    if(mode == CTK_MODE_NORMAL) {
#if CTK_CONF_MOUSE_SUPPORT 
    /* If there is any change in the mouse conditions, find out in
       which window the mouse pointer currently is in order to send
       the correct signals, or bring a window to focus. */
    if(mouse_moved || mouse_button_changed) {
      ctk_mouse_show();
      screensaver_timer = 0;
      
      if(myc == 0) {
	/* Here we should do whatever needs to be done when the mouse
	   moves around and clicks in the menubar. */
	if(mouse_clicked) {
	  static unsigned char titlelen;
	  
	  /* Find out which menu that the mouse pointer is in. Start
	     with the ->next menu after the desktop menu. We assume
	     that the menus start one character from the left screen
	     side and that the desktop menu is farthest to the
	     right. */
	  menux = 1;
	  for(menu = menus.menus->next;
	      menu != NULL; menu = menu->next) {
	    titlelen = menu->titlelen;
	    if(mxc >= menux && mxc <= menux + titlelen) {
	      break;
	    }
	    menux += titlelen;
	  }
	  
	  /* Also check desktop menu. */
	  if(mxc >= width - 7 &&
	     mxc <= width - 1) {
	    menu = &desktopmenu;
	  }
	  
	  menus.open = menu;
	  redraw |= REDRAW_MENUPART;
	}
      } else {
	--myc;

	if(menus.open != NULL) {
	  static unsigned char nitems;
	  
	  /* Do whatever needs to be done when a menu is open. */

	  /* First check if the mouse pointer is in the currently open
	     menu. */
	  if(menus.open == &desktopmenu) {
	    menux = width - CTK_CONF_MENUWIDTH;
	  } else {
	    menux = 1;
	    for(menu = menus.menus->next; menu != menus.open;
		menu = menu->next) {
	      menux += menu->titlelen;
	    }
	  }

	  nitems = menus.open->nitems;
	  /* Find out which of the menu items the mouse is pointing
	     to. */
	  if(mxc >= menux && mxc <= menux + CTK_CONF_MENUWIDTH) {    
	    if(myc <= nitems) {
	      menus.open->active = myc;
	    } else {
	      menus.open->active = nitems - 1;
	    }
	  }
	  
	  if(mouse_clicked) {
	    if(mxc >= menux && mxc <= menux + CTK_CONF_MENUWIDTH &&
	       myc <= nitems) {
	      redraw |= activate_menu();
	    } else {
	      lastmenu = menus.open;
	      menus.open = NULL;
	      redraw |= REDRAW_MENUPART;
	    }
	  } else {
	    redraw |= REDRAW_MENUS;	  
	  }
	} else {

	  /* Walk through the windows from top to bottom to see in
	     which window the mouse pointer is. */
	  if(dialog != NULL) {
	    window = dialog;
	  } else {	  	 	  
	    for(window = windows; window != NULL;
		window = window->next) {
	      
	      /* Check if the mouse is within the window. */
	      if(mxc >= window->x &&
		 mxc <= window->x + window->w +
		        2 * ctk_draw_windowborder_width &&
		 myc >= window->y &&
		 myc <= window->y + window->h +
		 ctk_draw_windowtitle_height +
		 ctk_draw_windowborder_height) {
		break;       	
	      }
	    }
	  }


	  /* If we didn't find any window, and there are no windows
	     open, the mouse pointer will definately be within the
	     background desktop window. */
	  if(window == NULL) {
	    window = &desktop_window;
	  }

	  /* If the mouse pointer moves around outside of the
	     currently focused window (or dialog), we should not have
	     any focused widgets in the focused window so we make sure
	     that there are none. */
	  if(windows != NULL &&
	     window != windows &&
	     windows->focused != NULL){	  
	    /*add_redrawwidget(windows->focused);
	    windows->focused = NULL;
	    redraw |= REDRAW_WIDGETS;*/
	    unfocus_widget(windows->focused);
	  }

	  if(window != NULL) {
	    /* If the mouse was clicked outside of the current window,
	       we bring the clicked window to front. */
	    if(dialog == NULL &&
	       window != &desktop_window &&	   
	       window != windows &&
	       mouse_clicked) {
	      /* Bring window to front. */
	      ctk_window_open(window);
	      redraw |= REDRAW_ALL;
	    } else {
	  
	      /* Find out which widget currently is under the mouse
		 pointer and give it focus, unless it already has
		 focus. */
	      mxc = mxc - window->x - ctk_draw_windowborder_width;
	      myc = myc - window->y - ctk_draw_windowtitle_height;
	    
	      /* See if the mouse pointer is on a widget. If so, it
		 should be selected and, if the button is clicked,
		 activated. */
	      for(widget = window->active; widget != NULL;
		  widget = widget->next) {
		
		if(mxc >= widget->x &&
		   mxc <= widget->x + widget->w &&
		   (myc == widget->y ||
		    ((widget->type == CTK_WIDGET_BITMAP ||
		      /*widget->type == CTK_WIDGET_TEXTMAP ||*/
		      widget->type == CTK_WIDGET_ICON) &&
		     (myc >= widget->y &&
		      myc <= widget->y +
		      ((struct ctk_bitmap *)widget)->h)))) {
		  break;
		}
	      }
	    

	      /* if the mouse is moved in the focused window, we emit
		 a ctk_signal_pointer_move signal to the owner of the
		 window. */
	      if(mouse_moved &&
		 (window != &desktop_window ||
		  windows == NULL)) {

		ek_post(window->owner, ctk_signal_pointer_move, NULL);

		/* If there was a focused widget that is not below the
		   mouse pointer, we remove focus from the widget and
		   redraw it. */
		if(window->focused != NULL &&
		   widget != window->focused) {
		  /*		  add_redrawwidget(window->focused);
		  if(CTK_WIDGET_TYPE(window->focused) ==
		     CTK_WIDGET_TEXTENTRY) {
		    ((struct ctk_textentry *)(window->focused))->state =
		      CTK_TEXTENTRY_NORMAL;
		  }
		  window->focused = NULL;*/
		  unfocus_widget(window->focused);
		}
		redraw |= REDRAW_WIDGETS;
		if(widget != NULL) {
		  select_widget(widget);
		}
	      }
	    
	      if(mouse_button_changed) {
		ek_post(window->owner, ctk_signal_pointer_button,
			(ek_data_t)mouse_button);
		if(mouse_clicked && widget != NULL) {
		  select_widget(widget);
		  redraw |= activate(widget);
		}
	      }
	    }
	  }    
	}
      }
    }
#endif /* CTK_CONF_MOUSE_SUPPORT */
    
    while(ctk_arch_keyavail()) {

      ctk_mouse_hide();
      
      screensaver_timer = 0;
      
      c = ctk_arch_getkey();      
      
      if(dialog != NULL) {
	window = dialog;
      } else if(windows != NULL) {
	window = windows;
      } else {
	window = &desktop_window;
      }
      
      widget = window->focused;
	  
      if(widget != NULL &&
	 widget->type == CTK_WIDGET_TEXTENTRY &&
	 widget->widget.textentry.state == CTK_TEXTENTRY_EDIT) {
	textentry_input(c, (struct ctk_textentry *)widget);
	add_redrawwidget(widget);
#if CTK_CONF_MENUS
      } else if(menus.open != NULL) {
	redraw |= menus_input(c);
#endif /* CTK_CONF_MENUS */
      } else {      
	switch(c) {
	case CTK_CONF_WIDGETDOWN_KEY:
	  switch_focus_widget(DOWN);
	  break;
	case CTK_CONF_WIDGETUP_KEY:
	  switch_focus_widget(UP);
	  break;
#if CTK_CONF_MENUS
	case CTK_CONF_MENU_KEY:
	  if(dialog == NULL) {
	    if(lastmenu == NULL) {
	      menus.open = menus.menus;
	    } else {
	      menus.open = lastmenu;
	    }
	    menus.open->active = 0;
	    redraw |= REDRAW_MENUS;
	  } 
	  break;
#endif /* CTK_CONF_MENUS */
	case CTK_CONF_WINDOWSWITCH_KEY:
	  if(windows != NULL) {
	    for(window = windows; window->next != NULL;
		window = window->next);
	    ctk_window_open(window);
	  }
	  break;
	default:

	  if(c == CH_ENTER &&
	     widget != NULL) {
	    redraw |= activate(widget);
	  } else {
	    if(widget != NULL &&
	       widget->type == CTK_WIDGET_TEXTENTRY) {
	      widget->widget.textentry.state = CTK_TEXTENTRY_EDIT;
	      textentry_input(c, (struct ctk_textentry *)widget);
	      add_redrawwidget(widget);
	    } else {
	      /*	      window->focused = NULL;*/
	      unfocus_widget(window->focused);
	      ek_post_synch(window->owner, ctk_signal_keypress, (ek_data_t)c);
	    }
	  }
	  break;
	}
      }

#if 0
      if(redraw & REDRAW_WIDGETS) {
	widgetptr = redraw_widgets;
	for(i = 0; i < MAX_REDRAWWIDGETS; ++i) {
	  widget_redraw(*widgetptr);
	  *widgetptr = NULL;
	  ++widgetptr;
	}
	redraw &= ~REDRAW_WIDGETS;
	redraw_widgetptr = 0;
      }
#endif /* 0 */
    }
#if CTK_CONF_WINDOWMOVE
  } else if(mode == CTK_MODE_WINDOWMOVE) {

    redraw = 0;

    window = windows;

#if CTK_CONF_MOUSE_SUPPORT

    /* If the mouse has moved, we move the window as well. */
    if(mouse_moved) {

      if(window->w + mxc + 2 >= width) {
	window->x = width - 2 - window->w;
      } else {
	window->x = mxc;
      }

      if(window->h + myc + ctk_draw_windowtitle_height +
	 ctk_draw_windowborder_height >= height) {
	window->y = height - window->h -
	  ctk_draw_windowtitle_height - ctk_draw_windowborder_height;
      } else {
	window->y = myc;
      }
      if(window->y > 0) {
	--window->y;
      }

      redraw = REDRAW_ALL;
    }		  
    
    /* Check if the mouse has been clicked, and stop moving the window
       if so. */
    if(mouse_button_changed &&
       mouse_button == 0) {
      mode = CTK_MODE_NORMAL;
      redraw = REDRAW_ALL;      
    }
#endif /* CTK_CONF_MOUSE_SUPPORT */
    
    while(mode == CTK_MODE_WINDOWMOVE && ctk_arch_keyavail()) {
    
      screensaver_timer = 0;
      
      c = ctk_arch_getkey();
      
      switch(c) {
      case CH_CURS_RIGHT:
	++window->x;
	if(window->x + window->w + 1 >= width) {
	  --window->x;
	}
	redraw = REDRAW_ALL;
	break;
      case CH_CURS_LEFT:
	if(window->x > 0) {
	  --window->x;
	}
	redraw = REDRAW_ALL;
	break;
      case CH_CURS_DOWN:
	++window->y;
	if(window->y + window->h + 2 >= height) {
	  --window->y;
	}
	redraw = REDRAW_ALL;
	break;
      case CH_CURS_UP:
	if(window->y > 0) {
	  --window->y;
	}
	redraw = REDRAW_ALL;
	break;
      default:
	mode = CTK_MODE_NORMAL;
	redraw = REDRAW_ALL;
	break;
      }
    }
#endif /* CTK_CONF_WINDOWMOVE */
  }

  if(redraw & REDRAW_ALL) {
    do_redraw_all(1, height);
#if CTK_CONF_MENUS
  } else if(redraw & REDRAW_MENUPART) {
    do_redraw_all(1, maxnitems + 1);
  } else if(redraw & REDRAW_MENUS) {
    ctk_draw_menus(&menus);
#endif /* CTK_CONF_MENUS */
  } else if(redraw & REDRAW_FOCUS) {
    if(dialog != NULL) {
      ctk_window_redraw(dialog);
    } else if(windows != NULL) {
      ctk_window_redraw(windows);	
    } else {
      ctk_window_redraw(&desktop_window);	
    }
  } else if(redraw & REDRAW_WIDGETS) {
    widgetptr = redraw_widgets;
    for(i = 0; i < MAX_REDRAWWIDGETS; ++i) {
      widget_redraw(*widgetptr);
      *widgetptr = NULL;
      ++widgetptr;
    }
  }    
  redraw = 0;
  redraw_widgetptr = 0;
  
}
/*-----------------------------------------------------------------------------------*/
EK_EVENTHANDLER(ctk_eventhandler, ev, data)
{

}
/*-----------------------------------------------------------------------------------*/
/** @} */
/** @} */