contiki/core/lib/ctk-textedit.c

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/**
* \file
* An experimental CTK text edit widget.
* \author Adam Dunkels <adam@dunkels.com>
*
* This module contains an experimental CTK widget which is
* implemented in the application process rather than in the CTK
* process. The widget is instantiated in a similar fashion as other
* CTK widgets, but is different from other widgets in that it
* requires a signal handler function to be called by the process
* signal handler function.
*
*/
/*
* Copyright (c) 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 desktop environment
*
* $Id: ctk-textedit.c,v 1.1 2006/06/17 22:41:17 adamdunkels Exp $
*
*/
#include "ctk-textedit.h"
#include <string.h>
/*-----------------------------------------------------------------------------------*/
void
ctk_textedit_init(struct ctk_textedit *t)
{
t->xpos = t->ypos = 0;
}
/*-----------------------------------------------------------------------------------*/
/**
* Add a CTK textedit widget to a window.
*
* \param w A pointer to the window to which the entry is to be added.
* \param t A pointer to the CTK textentry structure.
*/
/*-----------------------------------------------------------------------------------*/
void
ctk_textedit_add(struct ctk_window *w,
struct ctk_textedit *t)
{
CTK_WIDGET_SET_FLAG(t, CTK_WIDGET_FLAG_MONOSPACE);
CTK_WIDGET_ADD(w, t);
}
/*-----------------------------------------------------------------------------------*/
/**
* The CTK textedit signal handler.
*
* This function must be called as part of the normal signal handler
* of the process that contains the CTK textentry structure.
*
* \param t A pointer to the CTK textentry structure.
* \param s The signal number.
* \param data The signal data.
*/
/*-----------------------------------------------------------------------------------*/
void
ctk_textedit_eventhandler(struct ctk_textedit *t,
process_event_t s,
process_data_t data)
{
char *textptr, *textptr2;
unsigned char len;
if(s == ctk_signal_keypress) {
CTK_WIDGET_FOCUS(t->label.window, &t->label);
textptr = &(t->label.text[t->ypos * t->label.w + t->xpos]);
*textptr &= 0x7f;
switch((ctk_arch_key_t)data) {
case CH_CURS_DOWN:
if(t->ypos < t->label.h - 1) {
++t->ypos;
}
break;
case CH_CURS_UP:
if(t->ypos > 0) {
--t->ypos;
}
break;
case CH_CURS_RIGHT:
len = strlen(&t->label.text[t->ypos * t->label.w]);
if(t->xpos < len) {
/* if(t->xpos < t->label.w) {*/
++t->xpos;
} else {
t->xpos = len;
}
break;
case CH_CURS_LEFT:
if(t->xpos > 0) {
--t->xpos;
} else {
if(t->ypos > 0) {
--t->ypos;
t->xpos = t->label.w - 1;
}
}
break;
case CH_ENTER:
t->xpos = 0;
if(t->ypos < t->label.h - 1) {
++t->ypos;
}
break;
case CH_DEL:
len = t->label.w - t->xpos;
if(t->xpos > 0 && len > 0) {
strncpy(textptr - 1, textptr,
len);
*(textptr + len - 1) = 0;
--t->xpos;
}
break;
default:
len = t->label.w - t->xpos;
if(len > 0) {
textptr2 = textptr + len - 1;
while(textptr2 + 1 > textptr) {
*(textptr2 + 1) = *textptr2;
--textptr2;
}
*textptr = (char)data;
++t->xpos;
if(t->xpos == t->label.w) {
t->xpos = 0;
if(t->ypos < t->label.h - 1) {
++t->ypos;
}
}
}
break;
}
textptr = &(t->label.text[t->ypos * t->label.w + t->xpos]);
*textptr |= 0x80;
CTK_WIDGET_REDRAW(&t->label);
} else if(s == ctk_signal_widget_activate &&
data == (process_data_t)t) {
textptr = &(t->label.text[t->ypos * t->label.w + t->xpos]);
*textptr &= 0x7f;
t->xpos = 0;
if(t->ypos < t->label.h - 1) {
++t->ypos;
}
textptr = &(t->label.text[t->ypos * t->label.w + t->xpos]);
*textptr |= 0x80;
CTK_WIDGET_REDRAW(&t->label);
}
}
/*-----------------------------------------------------------------------------------*/