rom/intuition/displayalert.c

   1 /*
   2     Copyright © 1995-2013, The AROS Development Team. All rights reserved.
   3     Copyright © 2001-2003, The MorphOS Development Team. All Rights Reserved.
   4     $Id$
   5 */
   6
   7 #include "intuition_intern.h"
   8
   9 /* I'm too lazy to open the font and query it. Anyway this is hardcoded. */
  10 #define TOPAZ_8_BASELINE 6
  11
  12 /* Perhaps this should be localized */
  13 static const char title[] = "Program alert: ";
  14
  15 static struct IntuiText *displayalert_makebody(STRPTR string, struct TextAttr *font)
  16 {
  17     struct IntuiText *res;
  18     char *s = string;
  19     unsigned int lines = 0;
  20     unsigned int i;
  21
  22     /* First count number of lines */
  23     do
  24     {
  25         s += 3;         /* Skip coordinates                           */
  26         while (*s++);   /* Skip text bytes including NULL terminator  */
  27         lines++;
  28     } while (*s++);     /* This automatically skips continuation byte */
  29
  30     res = AllocVec(sizeof(struct IntuiText) * lines, MEMF_ANY);
  31     if (!res)
  32         return NULL;
  33
  34     s = string;
  35     for (i = 0; i < lines; i++)
  36     {
  37         res[i].FrontPen = 1;
  38         res[i].BackPen  = 0;
  39         res[i].DrawMode = JAM2;
  40         res[i].LeftEdge = AROS_BE2WORD(*((UWORD *)s));
  41         s += 2;
  42         res[i].TopEdge  = *s++ - TOPAZ_8_BASELINE;
  43         res[i].ITextFont = font;
  44         res[i].IText = s;
  45         while(*s++);
  46         res[i].NextText = *s++ ? &res[i+1] : NULL;
  47     }
  48
  49     return res;
  50 }
  51
  52 /*****************************************************************************
  53
  54     NAME */
  55 #include <proto/intuition.h>
  56
  57         AROS_LH3(BOOL, DisplayAlert,
  58
  59 /*  SYNOPSIS */
  60         AROS_LHA(ULONG , alertnumber, D0),
  61         AROS_LHA(UBYTE*, string, A0),
  62         AROS_LHA(UWORD , height, D1),
  63
  64 /*  LOCATION */
  65         struct IntuitionBase *, IntuitionBase, 15, Intuition)
  66
  67 /*  FUNCTION
  68         Bring up an alert with the given message.
  69
  70     INPUTS
  71         alertnumber - Value determining type of alert. For historical reasons,
  72                  this is the same value as passed to Alert(). However,
  73                  this functions takes into account only AT_DeadEnd bit.
  74         string - A pointer to text data. Text data have the following layout:
  75                  each string is preceded by 3 bytes. The first two of them are
  76                  the X coordinates of the string in the alert display. This is
  77                  given as a big-endian value. The third byte is the Y
  78                  coordinate of the text's baseline. Then a NUL-terminated
  79                  string follows by itself. After the NUL terminator there's
  80                  one more byte. If it's not zero, another string starts from
  81                  the next byte. Zero marks the end of the sequence. The text
  82                  is always rendered using the topaz/8 font.
  83         height - The height of alert display in pixels.
  84
  85     RESULT
  86         Always FALSE if AT_DeadEnd bit is set in alertnumber. Otherwise the
  87         function returns TRUE or FALSE depending on what user chooses. In
  88         AROS, alerts are presented in a requester with two gadgets: Ok and
  89         Cancel. Ok returns TRUE; Cancel returns FALSE.
  90
  91         If the alert could not be posted for whatever reason, FALSE is
  92         returned.
  93
  94     NOTES
  95         This function is obsolete and exists only for backwards compatibility
  96         with AmigaOS(tm). On various modern systems this function has
  97         different effects. On classic Amiga(tm) this function may not work
  98         with RTG displays, so it is generally deprecated. Please don't use it
  99         in new software! Use legitimate intuition requesters if you want to
 100         present some message to the user.
 101
 102     EXAMPLE
 103
 104     BUGS
 105
 106     SEE ALSO
 107
 108     INTERNALS
 109
 110 *****************************************************************************/
 111 {
 112     AROS_LIBFUNC_INIT
 113
 114     struct TextAttr font = {
 115         "topaz.font",
 116         8,
 117         FS_NORMAL,
 118         0
 119     };
 120     struct IntuiText postext = {
 121         1, 0, JAM2,
 122         0, 0,
 123         NULL,
 124         "Ok"
 125     };
 126     struct IntuiText negtext = {
 127         1, 0, JAM2,
 128         0, 0,
 129         NULL,
 130         "Cancel"
 131     };
 132     struct IntuiText *body = displayalert_makebody(string, &font);
 133     struct Window *req;
 134     LONG ret = FALSE;
 135
 136     if (body)
 137     {
 138         char *buf;
 139         unsigned int l1, l2;
 140         struct Task *t = FindTask(NULL);
 141
 142         l1 = strlen(title);
 143         l2 = strlen(t->tc_Node.ln_Name) + 1;
 144         buf = AllocMem(l1 + l2, MEMF_ANY);
 145         if (buf)
 146         {
 147             CopyMem(title, buf, l1);
 148             CopyMem(t->tc_Node.ln_Name, &buf[l1], l2);
 149
 150             /*
 151              * This is actually the same as AutoRequest(), without IDCMP processing.
 152              * We use internal function instead of BuildSysRequest() because the latter
 153              * does not allow to specify own title for the requester. In order to stay
 154              * compatible with various patches which modify system requesters look and
 155              * feel we call all three functions by their internal entry points.
 156              */
 157             if (alertnumber & AT_DeadEnd)
 158                 req = buildsysreq_intern(NULL, buf, body, NULL, &postext, 0, 640, height, IntuitionBase);
 159             else
 160                 req = buildsysreq_intern(NULL, buf, body, &postext, &negtext, 0, 640, height, IntuitionBase);
 161
 162                 if (req)
 163             {
 164                 while ((ret = sysreqhandler_intern(req, NULL, TRUE, IntuitionBase)) == -2);
 165                 freesysreq_intern(req, IntuitionBase);
 166             }
 167
 168             FreeMem(buf, l1 + l2);
 169         }
 170         FreeVec(body);
 171     }
 172
 173     return ret;
 174
 175     AROS_LIBFUNC_EXIT
 176 } /* DisplayAlert */