contiki/ctk/ctk.c

/*
 * Copyright (c) 2002, 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. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgement:
 *        This product includes software developed by Adam Dunkels. 
 * 4. 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 "ctk" console GUI toolkit for cc65
 *
 * $Id: ctk.c,v 1.12 2003/04/11 20:22:03 adamdunkels Exp $
 *
 */

#include "cc.h"
#include "ek.h"
#include "dispatcher.h"
#include "ctk.h"
#include "ctk-draw.h"
#include "ctk-conf.h"
#include "ctk-mouse.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 - 5)
#define ICONY_START  0
#define ICONX_DELTA  -8
#define ICONY_DELTA  5
#define ICONY_MAX    (height - 4)

static void ctk_idle(void);
static DISPATCHER_SIGHANDLER(ctk_sighandler, s, data);
static struct dispatcher_proc p =
  {DISPATCHER_PROC("CTK Contiki GUI", ctk_idle, ctk_sighandler, NULL)};
static ek_id_t ctkid;

ek_signal_t ctk_signal_keypress,
  ctk_signal_timer,
  ctk_signal_button_activate,
  ctk_signal_button_hover,
  ctk_signal_hyperlink_activate,
  ctk_signal_hyperlink_hover,
  ctk_signal_menu_activate,
  ctk_signal_window_close,
  ctk_signal_pointer_move,
  ctk_signal_pointer_button;

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

static unsigned short screensaver_timer;
#define SCREENSAVER_TIMEOUT (5*60)

#if CTK_CONF_MENUS
/*-----------------------------------------------------------------------------------*/
/* make_desktopmenu(void)
 *
 * 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 */
/*-----------------------------------------------------------------------------------*/
/* ctk_init(void)
 *
 * Initializes CTK. Must be called before any other CTK function.
 */
void
ctk_init(void)
{
  ctkid = dispatcher_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;
  
  ctk_signal_keypress = dispatcher_sigalloc();
  ctk_signal_timer = dispatcher_sigalloc();
  ctk_signal_button_activate = dispatcher_sigalloc();
  ctk_signal_button_hover = dispatcher_sigalloc();
  ctk_signal_hyperlink_activate = dispatcher_sigalloc();
  ctk_signal_hyperlink_hover = dispatcher_sigalloc();
  ctk_signal_menu_activate = dispatcher_sigalloc();
  ctk_signal_window_close = dispatcher_sigalloc();

  ctk_signal_pointer_move = dispatcher_sigalloc();
  ctk_signal_pointer_button = dispatcher_sigalloc();
  
  dispatcher_listen(ctk_signal_timer);
  dispatcher_timer(ctk_signal_timer, NULL, CLK_TCK);

  mode = CTK_MODE_NORMAL;

  iconx = ICONX_START;
  icony = ICONY_START;
  
}
/*-----------------------------------------------------------------------------------*/
/* void ctk_mode_set()
 */
void
ctk_mode_set(unsigned char m) {
  mode = m;
}
/*-----------------------------------------------------------------------------------*/
unsigned char
ctk_mode_get(void) {
  return mode;
}
/*-----------------------------------------------------------------------------------*/
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;
  }
  
  ctk_widget_add(&desktop_window, icon);
#endif /* CTK_CONF_ICONS */
}
/*-----------------------------------------------------------------------------------*/
void
ctk_dialog_open(struct ctk_window *d)
{
  dialog = d;
}
/*-----------------------------------------------------------------------------------*/
void
ctk_dialog_close(void)
{
  dialog = NULL;
}
/*-----------------------------------------------------------------------------------*/
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 */
}
/*-----------------------------------------------------------------------------------*/
void
ctk_window_close(struct ctk_window *w)
{
  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 */
}
/*-----------------------------------------------------------------------------------*/
static void 
make_windowbuttons(CC_REGISTER_ARG struct ctk_window *window)
{
#if CTK_CONF_WINDOWMOVE
  CTK_BUTTON_NEW(&window->titlebutton, 0, -1, window->titlelen, window->title);
#else
  CTK_LABEL_NEW(&window->titlebutton, 0, -1, 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, -1, 1, "x");
#else
  CTK_LABEL_NEW(&window->closebutton, window->w - 4, -1, 3, 1, "   ");
#endif /* CTK_CONF_WINDOWCLOSE */  
  CTK_WIDGET_ADD(window, &window->closebutton);
}
/*-----------------------------------------------------------------------------------*/
void
ctk_window_clear(struct ctk_window *window)
{
  window->active = window->inactive = window->focused = NULL;
  
  make_windowbuttons(window);
}
/*-----------------------------------------------------------------------------------*/
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;
#endif /* CTK_CONF_MENUS */
}
/*-----------------------------------------------------------------------------------*/
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;
      return;
    }
  }
#endif /* CTK_CONF_MENUS */
}
/*-----------------------------------------------------------------------------------*/
static void
do_redraw_all(unsigned char clipy1, unsigned char clipy2)
{
  struct ctk_window *w;
  struct ctk_widget *widget;

  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, 0, 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);
    }
    /* Draw focused window */
    ctk_draw_clear_window(windows, CTK_FOCUS_WINDOW, clipy1, clipy2);
    ctk_draw_window(windows, CTK_FOCUS_WINDOW, clipy1, clipy2);
  }

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

#if CTK_CONF_MENUS
  ctk_draw_menus(&menus);
#endif /* CTK_CONF_MENUS */
}
/*-----------------------------------------------------------------------------------*/
void
ctk_redraw(void)
{
  if(DISPATCHER_CURRENT() == ctkid) {
    if(mode == CTK_MODE_NORMAL ||
       mode == CTK_MODE_WINDOWMOVE) {
      do_redraw_all(1, height);
    }
  } else {
    redraw |= REDRAW_ALL;
  }
}
/*-----------------------------------------------------------------------------------*/
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);
  }  
}
/*-----------------------------------------------------------------------------------*/
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 - 3) {
    window->y = 0;
  } else {
    window->y = (height - h - 1) / 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->active = window->inactive = window->focused = NULL;
}
/*-----------------------------------------------------------------------------------*/
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);  
}
/*-----------------------------------------------------------------------------------*/
void
ctk_dialog_new(CC_REGISTER_ARG struct ctk_window *window,
	       unsigned char w, unsigned char h)
{
  window_new(window, w, h, NULL);
}
/*-----------------------------------------------------------------------------------*/
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 */
}
/*-----------------------------------------------------------------------------------*/
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 */
}
/*-----------------------------------------------------------------------------------*/
static void
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;
  }
}
/*-----------------------------------------------------------------------------------*/
void
ctk_widget_redraw(struct ctk_widget *widget)
{
  struct ctk_window *window;

  if(mode != CTK_MODE_NORMAL) {
    return;
  }

  /* If this function isn't called by CTK itself, we only queue the
     redraw request. */
  if(DISPATCHER_CURRENT() != ctkid) {
    redraw |= REDRAW_WIDGETS;
    add_redrawwidget(widget);
  } else {
    
    /* 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(window == windows) {
	  ctk_draw_widget(widget, CTK_FOCUS_WINDOW, 0, height);	      
	} else if(window == &desktop_window) {
	  ctk_draw_widget(widget, 0, 0, height);
	}
      }
  }
}
/*-----------------------------------------------------------------------------------*/
void
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;
    }
  }
}
/*-----------------------------------------------------------------------------------*/
static void
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) {    
      dispatcher_emit(ctk_signal_hyperlink_hover, window->focused,
		      window->owner);
    } else if(window->focused->type == CTK_WIDGET_BUTTON) {    
      dispatcher_emit(ctk_signal_button_hover, window->focused,
		      window->owner);      
    } 
    
    add_redrawwidget(window->focused);
  }

}
/*-----------------------------------------------------------------------------------*/
#define UP 0
#define DOWN 1
#define LEFT 2
#define RIGHT 3
static void
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;
  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;  
  /*  ctk_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 
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
      dispatcher_emit(ctk_signal_window_close, windows, w->window->owner);
      ctk_window_close(windows);
      return REDRAW_ALL;
#endif /* CTK_CONF_WINDOWCLOSE */
    } else if(w == (struct ctk_widget *)&windows->titlebutton) {
#if CTK_CONF_WINDOWCLOSE
      mode = CTK_MODE_WINDOWMOVE;
#endif /* CTK_CONF_WINDOWCLOSE */
    } else {
      dispatcher_emit(ctk_signal_button_activate, w,
		      w->window->owner);
    }
#if CTK_CONF_ICONS
  } else if(w->type == CTK_WIDGET_ICON) {
    dispatcher_emit(ctk_signal_button_activate, w,
		    w->widget.icon.owner);
#endif /* CTK_CONF_ICONS */
  } else if(w->type == CTK_WIDGET_HYPERLINK) {    
    dispatcher_emit(ctk_signal_hyperlink_activate, w,
		    DISPATCHER_BROADCAST);
  } 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;
    }
    add_redrawwidget(w);
    return REDRAW_WIDGETS;
  }
  return REDRAW_NONE;
}
/*-----------------------------------------------------------------------------------*/
static void
textentry_input(ctk_arch_key_t c,
		CC_REGISTER_ARG struct ctk_textentry *t)
{
  static 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 &&
       *cptr != 0) {
      ++txpos;
    }
    break;

  case CH_CURS_UP:
#if CTK_CONF_TEXTENTRY_MULTILINE
    if(t->h == 1) {
      txpos = 0;
    } else {
      if(typos > 0) {
	--typos;
      } else {
	t->state = CTK_TEXTENTRY_NORMAL;
      }
    }
#else
    txpos = 0;
#endif /* CTK_CONF_TEXTENTRY_MULTILINE */
    break;
    
  case CH_CURS_DOWN:
#if CTK_CONF_TEXTENTRY_MULTILINE
    if(t->h == 1) {
      txpos = strlen(t->text);
    } else {
      if(typos < t->h - 1) {
	++typos;
      } else {
	t->state = CTK_TEXTENTRY_NORMAL;
      }
    }
#else
    txpos = strlen(t->text);
#endif /* CTK_CONF_TEXTENTRY_MULTILINE */
    break;
    
  case CH_ENTER:
#if CTK_CONF_TEXTENTRY_MULTILINE
    if(t->h == 1) {
      t->state = CTK_TEXTENTRY_NORMAL;
    } else {
      if(typos < t->h - 1) {
	++typos;
	txpos = 0;
      } else {
	t->state = CTK_TEXTENTRY_NORMAL;
      }
    }
#else
    t->state = CTK_TEXTENTRY_NORMAL;
#endif /* CTK_CONF_TEXTENTRY_MULTILINE */
    break;
    
  default:
    len = tlen - txpos - 1;
    if(c == CH_DEL) {
      if(txpos > 0 && len > 0) {
	strncpy(cptr - 1, cptr,
		len);
	*(cptr + len - 1) = 0;
	--txpos;
      }
    } else {
      if(len > 0) {
	cptr2 = cptr + len - 1;
	while(cptr2 + 1 > cptr) {
	  *(cptr2 + 1) = *cptr2;
	  --cptr2;
	}
	
	*cptr = c;
	++txpos;
      }
    }
    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 {
    dispatcher_emit(ctk_signal_menu_activate, menus.open,
		    DISPATCHER_BROADCAST);
  }
  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
ctk_idle(void)     
{
  static ctk_arch_key_t c;
  static unsigned char i;
  register struct ctk_window *window;
  register struct ctk_widget *widget;
#if CTK_CONF_MOUSE_SUPPORT 
  static unsigned char mxc, myc, mouse_button_changed, mouse_moved,
    mouse_clicked;
  static unsigned char menux;
  struct ctk_menu *menu;

#endif /* CTK_CONF_MOUSE_SUPPORT */
  
#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(mode == CTK_MODE_SCREENSAVER) {
#ifdef CTK_SCREENSAVER_RUN
    CTK_SCREENSAVER_RUN();
#endif /* CTK_SCREENSAVER_RUN */
    if(ctk_arch_keyavail()
#if CTK_CONF_MOUSE_SUPPORT
       || mouse_moved || mouse_button_changed
#endif /* CTK_CONF_MOUSE_SUPPORT */
       ) {
      mode = CTK_MODE_NORMAL;
      ctk_draw_init();
      ctk_redraw();
    }
  } else 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) {
	  /* 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) {
	    if(mxc >= menux && mxc <= menux + menu->titlelen) {
	      break;
	    }
	    menux += menu->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) {
	  /* Do whatever needs to be done when a menu is open. */

	  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;
	    }
	  }

	  if(mxc >= menux && mxc <= menux + CTK_CONF_MENUWIDTH) {
	    menus.open->active = myc;
	  }
	  
	  if(mouse_clicked) {
	    if(mxc >= menux && mxc <= menux + CTK_CONF_MENUWIDTH) {
	      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 &&
		 myc >= window->y &&
		 myc <= window->y + window->h) {
		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 &&
	     windows == 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;
	  }

	  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 - 1;
	      myc = myc - window->y - 1;      
	    
	      /* 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(mouse_moved) {
		dispatcher_emit(ctk_signal_pointer_move, NULL,
				window->owner);

		

		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;
		}
		redraw |= REDRAW_WIDGETS;
		if(widget != NULL) {
		  select_widget(widget);
		}
	      }
	    
	      if(mouse_button_changed) {
		dispatcher_emit(ctk_signal_pointer_button,
				(ek_data_t)mouse_button,
				window->owner);
		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 CH_CURS_RIGHT:
	  switch_focus_widget(RIGHT);
	  break;
	case CH_CURS_DOWN:
	  switch_focus_widget(DOWN);
	  break;
	case CH_CURS_LEFT:
	  switch_focus_widget(LEFT);
	  break;
	case CH_CURS_UP:
	  switch_focus_widget(UP);
	  break;
	case CH_ENTER:
	  redraw |= activate(widget);
	  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);
	    ctk_redraw();
	  }
	  break;
	default:
	  if(widget->type == CTK_WIDGET_TEXTENTRY) {
	    widget->widget.textentry.state = CTK_TEXTENTRY_EDIT;
	    textentry_input(c, (struct ctk_textentry *)widget);
	    add_redrawwidget(widget);
	  } else {
	    dispatcher_emit(ctk_signal_keypress, (void *)c,
			    window->owner);
	  }
	  break;
	}
      }

      if(redraw & REDRAW_WIDGETS) {
	for(i = 0; i < redraw_widgetptr; ++i) {
	  ctk_widget_redraw(redraw_widgets[i]);
	}
	redraw &= ~REDRAW_WIDGETS;
	redraw_widgetptr = 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 + 2 >= height) {
	window->y = height - 2 - window->h;
      } 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;
      case CH_ENTER:
      case CH_ESC:
	mode = CTK_MODE_NORMAL;
	redraw = REDRAW_ALL;
	break;
      }
    }
    /*    if(redraw & REDRAW_ALL) {
      do_redraw_all(1, height);
    }
    redraw = 0;*/
#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) {
    for(i = 0; i < redraw_widgetptr; ++i) {
      ctk_widget_redraw(redraw_widgets[i]);
    }
  }    
  redraw = 0;
  redraw_widgetptr = 0;
  
}
/*-----------------------------------------------------------------------------------*/
static
DISPATCHER_SIGHANDLER(ctk_sighandler, s, data)
{
  DISPATCHER_SIGHANDLER_ARGS(s, data);
  
  if(s == ctk_signal_timer) {
    if(mode == CTK_MODE_NORMAL) {
      ++screensaver_timer;
      if(screensaver_timer == SCREENSAVER_TIMEOUT) {
#ifdef CTK_SCREENSAVER_INIT
	CTK_SCREENSAVER_INIT();
#endif /* CTK_SCREENSAVER_INIT */
	mode = CTK_MODE_SCREENSAVER;
	screensaver_timer = 0;
      }
    }
    dispatcher_timer(ctk_signal_timer, data, CLK_TCK);
  }
}
/*-----------------------------------------------------------------------------------*/