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|
/***************************************************************************
gui_edit.c - description
-------------------
begin : Wed Oct 16 2002
copyright : (C) 2002 by Michael Speck
email : kulkanie@gmx.net
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include <stdlib.h>
#include <string.h>
#include "gui_widget.h"
#include "gui_edit.h"
extern GuiTheme *gui_theme;
extern SDL_Surface *stk_display;
extern GuiWidget *gui_key_widget;
/*
====================================================================
LOCALS
====================================================================
*/
/*
====================================================================
Global edit variables that are used by the focused widget and
are global as there is only one keyboard they can be related
with.
====================================================================
*/
static int gui_edit_blink_time = 0; /* used to toggle gui_edit_blink
twice a second */
static int gui_edit_blink = 0; /* if true a cursor is displayed at
the edit position */
static int gui_edit_delay = 0;
static int gui_edit_interval = 0; /* after a delay of 300 ms the
keyevent is repeated at an interval of 100 */
static int gui_edit_keysym = -1; /* last pressed keysym */
static int gui_edit_unicode = -1; /* last pressed unicode */
/* FORWARDED */
static void gui_edit_handle_key(
GuiWidget *widget, int keysym, int unicode );
static int gui_edit_adjust_cursor( GuiWidget *widget, int offset );
/*
====================================================================
Default event handler
====================================================================
*/
static void default_event_handler(
GuiWidget *widget, GuiEvent *event )
{
char *ptr;
int px, py, i;
switch ( event->type ) {
case GUI_DESTROY:
if ( widget->spec.edit.buffer )
free( widget->spec.edit.buffer );
if ( widget->spec.edit.display_buffer )
free( widget->spec.edit.display_buffer );
break;
case GUI_DRAW:
/* display surface */
stk_surface_blit(
widget->surface, 0, 0, -1, -1,
stk_display,
widget->screen_region.x,
widget->screen_region.y );
/* add text */
gui_theme->edit_font->align = STK_FONT_ALIGN_LEFT;
ptr = widget->spec.edit.display_buffer;
px = widget->screen_region.x + widget->border;
py = widget->screen_region.y + widget->border +
widget->spec.edit.y_offset;
for ( i = 0; i < widget->spec.edit.height;
i++, py += gui_theme->edit_font->height,
ptr += widget->spec.edit.width + 1 )
stk_font_write( gui_theme->edit_font,
stk_display, px, py, -1, ptr );
/* add cursor */
if ( widget == gui_key_widget || widget->focused )
if ( gui_edit_blink )
stk_surface_fill( stk_display,
px + widget->spec.edit.x *
gui_theme->edit_font->width,
widget->screen_region.y +
widget->border + widget->spec.edit.y_offset +
widget->spec.edit.y *
gui_theme->edit_font->height,
1, gui_theme->edit_font->height,
0xffffff );
break;
case GUI_KEY_PRESSED:
if ( gui_edit_keysym != event->key.keysym ) {
gui_edit_delay = 250;
gui_edit_handle_key( widget,
event->key.keysym,
event->key.unicode );
//stk_sound_play( gui_theme->type_sound );
}
break;
case GUI_KEY_RELEASED:
gui_edit_keysym = -1;
break;
case GUI_FOCUS_OUT:
gui_edit_blink = 0;
gui_widget_draw( widget );
break;
case GUI_CLICKED:
stk_sound_play( gui_theme->click_sound );
px = event->button.x - widget->screen_region.x -
widget->border;
py = event->button.y - widget->screen_region.y -
widget->border - widget->spec.edit.y_offset;
gui_edit_adjust_cursor( widget,
(py / gui_theme->edit_font->height) *
widget->spec.edit.width +
(px / gui_theme->edit_font->width) +
widget->spec.edit.start - widget->spec.edit.pos + 1 );
gui_edit_blink = 1;
gui_edit_blink_time = 0;
gui_widget_draw( widget );
break;
}
}
/*
====================================================================
Render the display buffer from the edit string and the first
character displayed of it. No screen update.
====================================================================
*/
static void gui_edit_update_display_buffer( GuiWidget *widget )
{
int i, length, left;
char *src, *dest;
memset( widget->spec.edit.display_buffer, 0,
(widget->spec.edit.width+1) * widget->spec.edit.height *
sizeof( char ) );
if ( widget->spec.edit.multi_line ) {
src = widget->spec.edit.buffer + widget->spec.edit.start;
left = strlen( src );
dest = widget->spec.edit.display_buffer;
for ( i = 0; i < widget->spec.edit.height; i++ ) {
length = widget->spec.edit.width;
if ( length > left )
length = left;
strncpy( dest, src, length );
dest += widget->spec.edit.width + 1;
src += length;
left -= length;
if ( left == 0 )
break;
}
}
else {
strncpy( widget->spec.edit.display_buffer,
widget->spec.edit.buffer + widget->spec.edit.start,
widget->spec.edit.width );
}
}
/*
====================================================================
Adjust edit cursor position by offset and return True
if the display buffer has changed. Do not update display.
====================================================================
*/
static int gui_edit_adjust_cursor( GuiWidget *widget, int offset )
{
int new_y, changed = 0;
/* adjust position */
widget->spec.edit.pos += offset;
if ( widget->spec.edit.pos < 0 ) widget->spec.edit.pos = 0;
if ( widget->spec.edit.pos > widget->spec.edit.length )
widget->spec.edit.pos = widget->spec.edit.length;
/* don't blink cursor while moving */
gui_edit_blink_time = 0;
/* update display position */
if ( widget->spec.edit.multi_line ) {
new_y = widget->spec.edit.pos / widget->spec.edit.width;
/* if this position is out of screen modify 'line'
and 'start' */
if ( new_y < widget->spec.edit.line ||
new_y >= widget->spec.edit.line + widget->spec.edit.height ) {
if ( new_y < widget->spec.edit.line )
widget->spec.edit.line = new_y;
else
widget->spec.edit.line = new_y - widget->spec.edit.height + 1;
widget->spec.edit.start =
widget->spec.edit.line * widget->spec.edit.width;
/* update the display buffer */
gui_edit_update_display_buffer( widget );
changed = 1;
}
widget->spec.edit.x =
widget->spec.edit.pos % widget->spec.edit.width;
widget->spec.edit.y = new_y - widget->spec.edit.line;
}
else {
if ( widget->spec.edit.pos < widget->spec.edit.start ) {
widget->spec.edit.start = widget->spec.edit.pos;
widget->spec.edit.x = 0;
/* update the display buffer */
gui_edit_update_display_buffer( widget );
changed = 1;
}
else
if ( widget->spec.edit.pos >=
widget->spec.edit.start + widget->spec.edit.width ) {
widget->spec.edit.start = widget->spec.edit.pos -
widget->spec.edit.width;
widget->spec.edit.x = widget->spec.edit.width;
/* update the display buffer */
gui_edit_update_display_buffer( widget );
changed = 1;
}
else {
/* within text */
widget->spec.edit.x =
widget->spec.edit.pos - widget->spec.edit.start;
}
}
return changed;
}
/*
====================================================================
Handle the pressed key, modify the edit buffer and update the
displayed edit if visible.
====================================================================
*/
static void gui_edit_handle_key(
GuiWidget *widget, int keysym, int unicode )
{
int i, changed = 0, old_length = widget->spec.edit.length;
switch ( keysym ) {
case SDLK_RIGHT:
gui_edit_adjust_cursor( widget, 1 );
changed = 1;
break;
case SDLK_LEFT:
gui_edit_adjust_cursor( widget, -1 );
changed = 1;
break;
case SDLK_DOWN:
gui_edit_adjust_cursor(
widget, widget->spec.edit.width );
changed = 1;
break;
case SDLK_UP:
gui_edit_adjust_cursor(
widget, -widget->spec.edit.width );
changed = 1;
break;
case SDLK_HOME:
gui_edit_adjust_cursor(
widget, -widget->spec.edit.pos );
changed = 1;
break;
case SDLK_END:
widget->spec.edit.pos = 0;
gui_edit_adjust_cursor(
widget, widget->spec.edit.length );
changed = 1;
break;
case SDLK_BACKSPACE:
if ( widget->spec.edit.pos > 0 ) {
--widget->spec.edit.pos;
for ( i = widget->spec.edit.pos;
i < widget->spec.edit.length - 1; i++ )
widget->spec.edit.buffer[i] =
widget->spec.edit.buffer[i + 1];
widget->spec.edit.buffer[i] = 0;
widget->spec.edit.length--;
if ( !gui_edit_adjust_cursor( widget, 0 ) )
gui_edit_update_display_buffer( widget );
changed = 1;
}
break;
case SDLK_DELETE:
if ( widget->spec.edit.pos < widget->spec.edit.length ) {
for ( i = widget->spec.edit.pos;
i < widget->spec.edit.length - 1; i++ )
widget->spec.edit.buffer[i] =
widget->spec.edit.buffer[i + 1];
widget->spec.edit.buffer[i] = 0;
widget->spec.edit.length--;
gui_edit_update_display_buffer( widget );
changed = 1;
}
break;
default:
if ( widget->spec.edit.filter[unicode] && widget->spec.edit.pos < widget->spec.edit.size )
if ( widget->spec.edit.length < widget->spec.edit.size ) {
for ( i = widget->spec.edit.size - 1;
i > widget->spec.edit.pos; i-- )
widget->spec.edit.buffer[i] =
widget->spec.edit.buffer[i - 1];
widget->spec.edit.buffer[widget->spec.edit.pos++] = unicode;
widget->spec.edit.length++;
if ( !gui_edit_adjust_cursor( widget, 0 ) )
gui_edit_update_display_buffer( widget );
changed = 1;
}
break;
}
if ( changed ) {
gui_edit_blink_time = 0;
gui_edit_blink = 1;
gui_widget_draw( widget );
gui_edit_interval = 0;
gui_edit_keysym = keysym;
gui_edit_unicode = unicode;
if ( old_length != widget->spec.edit.length ) {
gui_widget_call_user_event_handler(
widget, gui_event_get_simple( GUI_CHANGED ) );
}
}
else
gui_edit_keysym = -1;
}
/*
====================================================================
PUBLICS
====================================================================
*/
/*
====================================================================
Create a multi-line editable widget. By checking the measurements
of the standard font the number of lines and the line width is
determined.
'text': is copied and displayed when first shown
'size': limit of characters (excluding the \0)
====================================================================
*/
GuiWidget* gui_edit_create(
GuiWidget *parent, int x, int y, int width, int height,
void (*user_event_handler)(GuiWidget*,GuiEvent*),
int border, int multi_line, int size, char *text )
{
GuiWidget *widget = gui_widget_create(
parent, GUI_EDIT, x, y, width, height,
default_event_handler, user_event_handler );
/* events */
gui_widget_enable_event( widget, GUI_CHANGED );
/* create surface, wallpaper and frame it */
widget->surface = stk_surface_create(
SDL_SWSURFACE, width, height );
SDL_SetColorKey( widget->surface, 0,0 );
stk_surface_apply_wallpaper( widget->surface, 0,0,-1,-1,
gui_theme->widget_wallpaper, STK_OPAQUE );
widget->border = stk_surface_apply_frame(
widget->surface, 0, 0, -1, -1,
gui_theme->widget_frame );
/* size w/o border */
widget->width -= 2 * widget->border;
widget->height -= 2 * widget->border;
/* grab keys */
widget->grab_keys = 1;
/* prepare text */
gui_edit_set_filter( widget, GUI_EDIT_DEFAULT );
widget->spec.edit.multi_line = multi_line;
widget->border += border;
widget->spec.edit.width =
(width - widget->border*2) /
gui_theme->edit_font->width;
if ( multi_line )
widget->spec.edit.height =
(height - widget->border*2) /
gui_theme->edit_font->height;
else
widget->spec.edit.height = 1;
widget->spec.edit.display_buffer =
calloc( (widget->spec.edit.width+1) * widget->spec.edit.height,
sizeof( char ) );
if ( widget->spec.edit.display_buffer == 0 )
GUI_ABORT( "Out Of Memory" );
gui_edit_resize_buffer( widget, size );
gui_edit_set_text( widget, text );
/* center single-line edit */
if ( !multi_line )
widget->spec.edit.y_offset =
(height - 2 * widget->border -
gui_theme->edit_font->height) / 2;
/* done */
return widget;
}
/*
====================================================================
Resize the edit buffer and clear any text. (no update)
====================================================================
*/
void gui_edit_resize_buffer( GuiWidget *widget, int size )
{
if ( widget->type != GUI_EDIT ) return;
widget->spec.edit.size = size;
if ( widget->spec.edit.buffer )
free( widget->spec.edit.buffer );
widget->spec.edit.buffer = calloc( size + 1, sizeof( char ) );
if ( widget->spec.edit.buffer == 0 )
GUI_ABORT( "Out Of Memory" );
}
/*
====================================================================
Set the edit's text. This resets the edit cursor's position to
end of text and updates displayed edit if visible.
====================================================================
*/
void gui_edit_set_text( GuiWidget *widget, char *text )
{
if ( widget->type != GUI_EDIT ) return;
/* copy text */
snprintf( widget->spec.edit.buffer, widget->spec.edit.size + 1, "%s", text );
widget->spec.edit.length = strlen( widget->spec.edit.buffer );
/* reset */
/* first character in first line */
widget->spec.edit.pos = 0;
widget->spec.edit.x = widget->spec.edit.y = 0;
widget->spec.edit.start = widget->spec.edit.line = 0;
/* jump to end */
if ( !gui_edit_adjust_cursor( widget, widget->spec.edit.length ) )
gui_edit_update_display_buffer( widget );
/* update */
if ( widget->visible )
gui_widget_draw( widget );
}
/*
====================================================================
Copy characters from 'start' to 'length' of the edit string to
'buffer' (at maximum limit characters including \0). If 'length'
is -1 the characters copied are those from 'start' to end of text.
====================================================================
*/
int gui_edit_get_text(
GuiWidget *widget, char *buffer, int limit,
int start, int length )
{
char *ptr;
if ( widget->type != GUI_EDIT ) return 0;
if ( start < 0 ) start = 0;
ptr = widget->spec.edit.buffer + start;
if ( length == -1 )
length = strlen( ptr );
if ( length > limit )
length = limit;
if ( length )
snprintf( buffer, limit, "%s", widget->spec.edit.buffer );
else
buffer[0] = 0;
return 1;
}
/*
====================================================================
Update the blinking cursor flag (no update) of the edit and in
case a key is pressed call gui_edit_handle_key().
====================================================================
*/
void gui_edit_update( GuiWidget *widget, int ms )
{
gui_edit_blink_time += ms;
if ( gui_edit_blink_time > 500 ) {
gui_edit_blink_time = 0;
gui_edit_blink = !gui_edit_blink;
gui_widget_draw( widget );
}
if ( gui_edit_keysym != -1 ) {
if ( gui_edit_delay > 0 ) {
gui_edit_delay -= ms;
if ( gui_edit_delay <= 0 )
gui_edit_delay = 0;
}
if ( gui_edit_delay == 0 ) {
if ( gui_edit_interval > 0 ) {
gui_edit_interval -= ms;
if ( gui_edit_interval < 0 )
gui_edit_interval = 0;
}
if ( gui_edit_interval == 0 ) {
gui_edit_handle_key( widget,
gui_edit_keysym, gui_edit_unicode );
gui_edit_interval = 30;
}
}
}
}
/*
====================================================================
Select a character set.
default: all non-whitespaces >=32 && <= 128
alpha: A-Z,a-z
numerical: 0-9
alphanumerical: A-Z,a-z,0-9
====================================================================
*/
void gui_edit_set_filter( GuiWidget *widget, int type )
{
int i, j;
if ( widget->type != GUI_EDIT ) return;
memset( widget->spec.edit.filter, 0,
sizeof( widget->spec.edit.filter ) );
switch ( type ) {
case GUI_EDIT_DEFAULT:
for ( i = 32; i <= 128; i++ )
widget->spec.edit.filter[i] = 1;
break;
case GUI_EDIT_ALPHANUMERICAL:
case GUI_EDIT_ALPHANUMERICAL2:
case GUI_EDIT_ALPHA:
for ( i = 65, j = 97; i <= 90; i++, j++ ) {
widget->spec.edit.filter[i] = 1;
widget->spec.edit.filter[j] = 1;
}
if ( type == GUI_EDIT_ALPHANUMERICAL || type == GUI_EDIT_ALPHANUMERICAL2 ) {
widget->spec.edit.filter[45] = 1;
for ( i = 48; i <= 57; i++ )
widget->spec.edit.filter[i] = 1;
}
if ( type == GUI_EDIT_ALPHANUMERICAL2 )
widget->spec.edit.filter[95] = 1;
break;
case GUI_EDIT_NUMERICAL:
for ( i = 48; i <= 57; i++ )
widget->spec.edit.filter[i] = 1;
widget->spec.edit.filter[45] = 1;
break;
}
}
|
