mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Libraries/Steel/c/scroller

   1 /*
   2  * scroller.c
   3  *
   4  * Scrolling text in an icon
   5  *
   6  * © 1994-1998 Straylight
   7  */
   8
   9 /*----- Licensing note ----------------------------------------------------*
  10  *
  11  * This file is part of Straylight's Steel library.
  12  *
  13  * Steel is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2, or (at your option)
  16  * any later version.
  17  *
  18  * Steel is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with Steel.  If not, write to the Free Software Foundation,
  25  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  */
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31
  32 #include "scroller.h"
  33
  34 #include "steel.h"
  35 #include "bbc.h"
  36 #include "msgs.h"
  37 #include "werr.h"
  38
  39 typedef struct scroller__str
  40 {
  41   wimp_w w;              /* Window handle of scroller */
  42   wimp_i i;              /* icon Handle */
  43   char *string;          /* Scrolling Message */
  44   char *initText;        /* Start Message */
  45   int index;             /* Index into actual string */
  46   int chars;             /* Printable string index */
  47   int initIndent;        /* X indent for initial message */
  48   int speed;             /* Speed of scroll */
  49   int cspeed;            /* Current speed of scroll */
  50   int counter;           /* Current value of delay */
  51   wimp_box box;          /* Icon bounding box */
  52   int baseline;          /* Y Position of message */
  53   int len;               /* Length of printable string */
  54   int cfg;               /* Current foreground colour */
  55   int fg :4;             /* Defualt foreground colour */
  56   int bg :4;             /* Defualt background colour */
  57   int pixel :8;          /* Current pixel offset */
  58   BOOL started :1;       /* Have we wrapped around? */
  59 }
  60 scroller__str;
  61
  62 #define max2(x,y) ((x)>(y) ? (x) : (y))
  63 #define min2(x,y) ((x)<(y) ? (x) : (y))
  64
  65 /* Display the entire string - used for redraw events */
  66
  67 static void scroller__display(scroller s,char *p)
  68 {
  69   int col;
  70   while (*p)
  71   {
  72     if (*p=='[')
  73     {
  74       switch (*++p)
  75       {
  76         case 'C':
  77           sscanf(p+1,"%i",&col);
  78           wimp_setcolour(col);
  79           break;
  80         case 'c':
  81           wimp_setcolour(s->fg);
  82           break;
  83       }
  84       while (*p++!=']') ;
  85     }
  86     else
  87       bbc_vdu(*p++);
  88   }
  89 }
  90
  91 /* Calculate the length of the string, without control codes */
  92
  93 static int scroller__length(char *p)
  94 {
  95   int i=0;
  96   while (*p)
  97   {
  98     if (*p=='[')
  99     {
 100       while (*p++!=']') ;
 101     }
 102     else
 103       i++,p++;
 104   }
 105   return (i);
 106 }
 107
 108 /* Redraw the icon */
 109
 110 void scroller_redraw(scroller s,wimp_redrawstr *r)
 111 {
 112   int ox,oy;
 113   int dx=wimpt_dx(),dy=wimpt_dy();
 114   ox=r->box.x0-r->scx;
 115   oy=r->box.y1-r->scy;
 116
 117   /* Does icon bounding box intersect with graphics window */
 118
 119   if ( !( ox+s->box.x0 <= r->g.x1-dx &&
 120           oy+s->box.y0 <= r->g.y1-dy &&
 121           ox+s->box.x1-dx >= r->g.x0 &&
 122           oy+s->box.y1-dy >= r->g.y0))
 123     return;
 124
 125   /* Yes -- Set graphics window to insection */
 126
 127   bbc_gwindow(max2(ox+s->box.x0,r->g.x0),
 128               max2(oy+s->box.y0,r->g.y0),
 129               min2(ox+s->box.x1,r->g.x1)-dx,
 130               min2(oy+s->box.y1,r->g.y1)-dy);
 131
 132   wimp_setcolour(s->bg | 0x80);
 133   bbc_clg();
 134   wimp_setcolour(s->fg);
 135
 136   if (s->started)
 137   {
 138     bbc_move(ox+s->box.x1-16*(s->chars+s->len)-s->pixel,oy+s->baseline);
 139     scroller__display(s,s->string);
 140   }
 141   else
 142   {
 143     bbc_move(ox+s->box.x1-16*s->chars-s->pixel-s->initIndent,oy+s->baseline);
 144     bbc_stringprint(s->initText);
 145   }
 146   bbc_move(ox+s->box.x1-16*s->chars-s->pixel,oy+s->baseline);
 147   scroller__display(s,s->string);
 148
 149   bbc_gwindow(r->g.x0,
 150               r->g.y0,
 151               r->g.x1-dx,
 152               r->g.y1-dy);
 153 }
 154
 155 /* Called on idle events to do the scroll */
 156
 157 static void scroller__idles(void *handle)
 158 {
 159   scroller s=handle;
 160   wimp_redrawstr r;
 161   BOOL more;
 162   int ox,oy;
 163   if (s->counter)
 164   {
 165     s->counter--;
 166     return;
 167   }
 168   s->pixel+=s->cspeed;
 169   if (s->pixel>16)
 170   {
 171     s->pixel&=0x0f;
 172     s->index++;
 173     s->chars++;
 174     if (!s->string[s->index])
 175     {
 176       s->index=0;
 177       s->chars=0;
 178       s->started=1;
 179     }
 180     if (s->string[s->index]=='[')
 181     {
 182       switch (s->string[++s->index])
 183       {
 184         case 'D':
 185           sscanf(s->string+s->index+1,"%i",&s->counter);
 186           while (s->string[s->index++]!=']') ;
 187           s->pixel-=s->speed;
 188           return;
 189         case 'C':
 190           sscanf(s->string+s->index+1,"%i",&s->cfg);
 191           while (s->string[s->index++]!=']') ;
 192           break;
 193         case 'c':
 194           while (s->string[s->index++]!=']') ;
 195           s->cfg=s->fg;
 196           break;
 197         case 'S':
 198           s->pixel-=s->cspeed;
 199           sscanf(s->string+s->index+1,"%i",&s->cspeed);
 200           while (s->string[s->index++]!=']') ;
 201           s->pixel+=s->cspeed;
 202           break;
 203         case 's':
 204           s->pixel-=s->cspeed;
 205           s->cspeed=s->speed;
 206           s->pixel+=s->cspeed;
 207           while (s->string[s->index++]!=']') ;
 208           break;
 209       }
 210     }
 211   }
 212   r.box=s->box;
 213   r.box.x0+=s->cspeed;
 214   wimp_blockcopy(s->w,&r.box,s->box.x0,s->box.y0);
 215   r.box.x0=r.box.x1-s->cspeed;
 216   r.w=s->w;
 217   wimp_update_wind(&r,&more);
 218   ox=r.box.x0-r.scx + s->box.x1-s->pixel;
 219   oy=r.box.y1-r.scy + s->baseline;
 220   while (more)
 221   {
 222     wimp_setcolour(s->bg);
 223     bbc_rectanglefill(ox,oy-28,16,28);
 224     wimp_setcolour(s->cfg);
 225     bbc_move(ox,oy);
 226     bbc_vdu(s->string[s->index]);
 227     wimp_get_rectangle(&r,&more);
 228   }
 229 }
 230
 231 /* Create a new sroller */
 232
 233 scroller scroller_create(dbox d,
 234                          dbox_field f,
 235                          char *string,
 236                          char *initial,
 237                          int startDelay)
 238 {
 239   scroller s=mem_alloc(sizeof(scroller__str));
 240   wimp_icon i;
 241   if (!s)
 242   {
 243     werr(FALSE,msgs_lookup("scrlNEM:Not enough memory for scrolltext"));
 244     return (FALSE);
 245   }
 246   s->w=dbox_syshandle(d);
 247   s->i=f;
 248   s->string=string;
 249   s->index=s->chars=-1;
 250   s->pixel=16;
 251   s->counter=startDelay;
 252   s->speed=s->cspeed=2;
 253   s->started=0;
 254   wimpt_noerr(wimp_get_icon_info(s->w,f,&i));
 255   s->box=i.box;
 256   s->len=scroller__length(string);
 257   s->initText=initial;
 258   s->initIndent=((i.box.x1-i.box.x0)/2+(strlen(s->initText)*8));
 259   s->fg=s->cfg=(i.flags >> 24) & 0x0f;
 260   s->bg=(i.flags >> 28) & 0x0f;
 261   s->baseline=s->box.y1-(s->box.y1-s->box.y0-32)/2-4;
 262   return (s);
 263 }
 264
 265 void scroller_speed(scroller s,int speed)
 266 {
 267   s->speed=s->cspeed=speed;
 268 }
 269
 270 void scroller_go(scroller s)
 271 {
 272   win_addIdleClaimer(scroller__idles,2,s);
 273 }
 274
 275 void scroller_destroy(scroller s)
 276 {
 277   win_removeIdleClaimer(scroller__idles,s);
 278   mem_free(s);
 279 }